Transmission Lines

I have an article brewing in me which is all about matching a low dipole for 160m to regular 50 ohm transmitter. The dipole I had in mind will be about 15 meters off the deck. My impedance will be about 20 ohms, maybe 25 if I can get it a bit higher. Basically, this is unnaceptable to me since I like to match things nicely.

Chris (G0EYO) sent me this link http://www.qsl.net/w4sat/qtrwavtr.htm which tells me that I need to insert a quarter-wave piece of coax that has an impedance of 35 ohms. Well, I don’t know about you, I don’t often have 35 ohm coax lying around, however a pair of 75 ohm quarter wave stubs will reduce the impedance of 75 ohms to 37.5 ohms. Near enough? I think so.

Thanks Chris, I think I worked it out now.

C.

Kef 104/2

Kef 104/2 104-2 104.2If you have never heard about the Kef 104/2 (104-2) loud speakers, you have missed a life-time treat. I am lucky enough to have the gold plated, bi-wired version. In fact, I had the factory make these for me in the mid-90s, nearly three years after production ended since I missed mine so much. They really are the last pair of 104/2s ever made. Kef upgraded all the components for me and made me brand new Rosewood shells from new veneer. Fabulous looking.

Now. There was originally a weak point with these speakers which was the tweeter. It wasn’t the speakers fault, but the user. I used to blow the tweeters on my first pair of 104/2s too regularly, however replacements were about £15 each so I just used to order a new set and start again. Blown tweeters normally happened when the amp would clip over a long period of time and gradually heat up the tweeter coil. Two things might happen. The cylinder would either warp or the coil would melt. This was not a speaker issue but the user. Basically, turn the volume down. Easier to say than do since mid-party in the heat of the moment, it’s easy to over drive stuff (hence why I now run a 3kW rig, just for party nights – it’s true).

Anyway, let’s correct a couple of worries out there on the internet to do with the replacement tweeter issue. Last year, I thought I had lost a tweeter and called the factory. Contrary to popular opinion, Kef have sourced a fabulous replacement tweeter and they sell them in pairs very ecconomically for 104/2 speaker systems for about £30 a pair. I ordered them up and fitted them. It transpired that I hadn’t lost a tweeter, it was my graphic that had gone AWOL, however the new tweeter is better for a number of reason – not only do they sound great but apparently have better resistance to warping and coil metdown. These days, I just tickle mine with a Crown K1 and they sound marvelous. I ran them as a spare pair at a party last month in the conservatory at half-volume and a couple of people remarked how enormous they sounded.

If you want a speaker to sound four times the size that it really is, buy a pair of these, massive sound stage, big presence and even vertical sound balance. I have no idea how this happens but it does. Stunning. Did I mention massive low frequency response? Amazing for films and rock. Amazing for anything actually! You can pick up non-bi-wired versions from as little as £300 on eBay. The bi-wired versions were essentially upgraded versions with a bi-wire system which I call the Mk2s. These retailed for £2,000. Massive price back then! Starting price for used versions of the Mk2s will be around the £450 mark, perhaps up to £800 for top condition Rosewoods. Always check for matching serial numbers.

POST SCRIPT

I sold these speakers a few months ago and it appears that the foam that held the bass cones to the basket had deteriorated completely and essentially fell off. He sent me the pictures. He discovered a man who rebuilt these at a cost of £85 each (x 4). I paid for them to be refurbished, otherwise the speakers would have been scrapped. They are now (apparently) as good as new. Now then, it appears that almost every 104/2 in the world will have the problem. What a disaster! Same with 105/3 and 107s too. A complete mess.

GB1DSG Special Event Mega Loop Project

Aidan M6TTT

Picture shows Aidan, M6TTT running his first pile-up from the Hut. First class Aidan, you really got the swing of this on Sunday. Fabulous effort.

We put nearly 800 QSOs (contacts) in the log and there are so many highlights, I can’t begin to mention them all. My personal highlight was working VK3FT at lunchtime today with a land-line quality copy on the 20 meter band. Keith spotted us which probably accounted for flurry of VK stations immediately afterwards from Australia. Thanks Keith.

We got spotted 25 times over the weekend which is certainly our personal record. Thanks to those stations that helped us maintain the pile up!

As usual, we used the MegaLoop (delta-loop) antenna, see this page for details:

Cheers all!

Callum.

Half-Term Narrowboat Trip

Wherethehell-Rwe Narrowboat TripThis trip was all about discovering the North Oxford canal via Braunston. Family rules dictate that we were to turn around when we get bored – which we did pretty quickly because there’s nothing to see up the North Oxford! We did a U turn on the morning of Day 2 and spent a pleasant 6 hours cruising back to Braunston, booking a table for 4 at the Old Plough.

During the trip, a couple of interesting moments are worth mentioning.  We stopped just after Hillmorton Locks (I’ll have to check this name but I don’t have the navigation book to hand) to fill with water and just as I was leaving, a hire boat came bombing past. Most hire boats are in a rush so it didn’t bother me. I’ve rarely been held up by one. However this one was different, he kept crashing into the banks! Had it not been dangerous, it would have been very funny! Luckily, narrowboats are made of steel that bounce rather well but it just amazed me that this guy kept getting his lefts and rights wrong. This is quite possible to do of course, but most people’s brains switch pretty rapidly so that their tiller arm becomes second nature. He was sharing the responsibility of getting this right with his teenage son and they both kept getting it wrong. His son would drive towards the bank and his Dad would intervene and make it worse! In the end, I made my excuses and asked in a loud voice if he would allow me to pass. He politely smiled in a way only an embarrased chap could and I skirted around him.

We run a walkie-talkie system on the a boat. I have the TS2000 permanently plumbed in at the helm and I leave a number of rechargeable PMR446 hand-helds lying about the place inside. Yesterday after giving a running commentary to the crew inside the boat I waited on a response and got nothing. I gave another shout and then another. I was asking them for my gloves that I had left on the well-deck (bow) when we filled up with water but I soon realised that someone had switched the radios off so I started using the air-horns. Beep Beep. Nothing. Normally, I get a head out the bow doors looking back at me asking what I want. Ziltch.

Then I had a brain wave. I had recently taught Emily her radio exam (which she passed) so I thought I’d put some morse code into the horns, she’d know that! Bip Bip Bip – Beeep Beeep Beeep – Bip Bip Bip. Yes, I was transmitting SOS on the horns. After the even louder set of blasts, I was worried that some old 2nd world war veteran from the Royal Signals would hear me and call the police so I snapped into reverse and stopped the boat in the middle of the channel and made my way inside. Wendy and Lochlan both had headphones on either watching TV or playing computer games so they didn’t hear but Emily was up and about. I asked her why she didn’t come and see me after hearing SOS on the horns? She said that she just thought I had a lot of boats that I was having problems with. Agh!

Later, we met a boat in the middle of the channel. I kept to the right and finally he kept to his right too. As we crossed paths, he asked me, “am I correct in thinking that we keep to the right – I’m new to this”? Cor blimey, a bit late to discover that!

In the afternoon of day 3, Emily and I were on the stern happily driving along chatting away. We turned a corner and spotted a small 20 foot fibreglass cabin cruiser coming towards us with a little outboard aiming for the centre of a bridge driven by woman who was visibly puffing and straining. She had right of way since she would have been first to the bridge. I dropped to dead slow, my 23 tons to her few hundred pounds. Eventually I was just sitting there at a stop as she came through the single-pass bridge and then aimed at a nasty low tree on my port side – even though there was space for her to come much closer to me, by about six feet. She preferred to aim her cabin cruiser (with brand-new immaculate pram-top roof) into the horthorn tree which nicely scratched her new roof. Swearing and blowing, as she scratched past, she scowled at me in a way only a pretty woman with a damaged ego could, “you could have f*cking moved over a bit!”

Her little husband kept his mouth shut and averted his eyes as I did one of my special anger management situation demonstrations – but failed to cope this time and gave her the war that she wanted. I would have preferred to put a couple of shotgun shells at the waterline to give her something to scream at! Can you imagine?

Harry the narrowboat cat

One experiment this trip was taking the three kittens with us. They’re not kittens anymore of course, but more like small tigers. Two of the three are extremely docile and follow Wendy about like a dog (really!) but the third is a throw-back to the wilder side of cats and longs for freedom even though all our (five!) cats are neutered. We have decided next time to only take the two docile ones and leave the third at home with his two older sisters. We are confident that once they understand, we’ll be able to let them wander off for a few minutes at a time which is what they do at home.

On our last night, we went for dinner at the Folly, bottom of the Oxford flight of locks. If you know that area, I turned around at the winding point (turning place) and reversed 300 yards down the canal using the bow thrusters as a kind of rudder. This is way cool since narrowboats don’t have any steering at all in reverse. See http://tinyurl.com/cfjnpe to see where we turned – and as a guide to our size, our 70 foot boat only just clears this turn by a few feet. The chef at the Folly is very funny. She’s got a nick-name of Tick-Tock. I’m not kidding. Her flat-mate in the village is a little Philipino girl and they call her Tic-Tac. Crazy girls.

A couple of issues this trip. First one was condensation on the stainless water tank. I’ve never noticed before but sticking my head inside the well deck, I saw a little bit too much water lying around and dripping off the tank. I confided in the Narrowboats Yahoo Group and David came up with the idea of sticking cork tiles or similar over the surface. The trouble is I can only get to around 30% of the surface area of the tank because it’s supposed to be maintenance free and you just can’t squeeze inside to do these things. So although it’ll probably work, it’s impractical. He’s since thought that I could use spray-foam. This is a permanent solution and if I get it wrong will be a bloody nightmare to remove, if not impossible without cutting the bow off! However, done properly – this would be an amazing solution and would cure the worry of having a frozen tank for good. Allan suggested shoving loads and loads of Rockwool insulation into all the gaps. Builders use this for attic insulation and cavity wall insulation. I believe this might be a superb solution and I’ll look into it, thanks Allan. I’ll report on this another day.

Lastly, I managed to temporarily block the toilet at the same time as everyone else needed to go. Typical. There’s too much detail to go into here so I’ll leave much of this to your your own imagination. The toilet is one of those propeller chopper-upper toilets with the sucker noise. Sounds like an aircraft loo. I don’t know the name of this damned expensive thing but too much debris in one flush seems to cause it all sorts of issues and it stops working. It still makes all the fabulous sucking and spinning noises, and you still get all the water but nothing happens, it just fills up with more water (and debris!). I found a plastic drinking glass (tumbler) and used it like an old fashioned plunger whilst at the same time hitting the flush button. This eventually cleared the issue but I had a heck of a lot of lumpy water that wouldn’t go down the toilet each flush, growing each time. I hit on the idea of taking a glass window out of the port-hole next to me and chucking pints of trashy water out the window. I laughed out loud at one point, considering visions of some poor chap on an old boat getting a lump of sh*t on his head! It was a seriously nasty morning. Anyway, it’s fixed now and seems to flush everytime at the expense of emptying my water tank and filling my toilet tank!

Callum.

“Milamba IV”

Milamba IVI like to keep my eye on my old host, Milamba IV, since renamed to Lady Andrea.

Yachtspotter.com have a page for this little ship that is periodically updated, depending on who sees the old girl.

The page is here:

http://www.yachtspotter.com/ysp2_ycard.php?foo=20090628

I notice at the end of last year, she’s moved across to Fort Lauderdale. I wonder when she’ll be seen again?

If you do see this girl, please drop me a mail and a few pictures, thanks.

Callum.

The earth, the moon and the sun

Tonight, my Cubs are doing the “Astronomer” badge. I thought it might be rather nice to give them an idea of the local solar system before moving on to the Big and Little dippers – and of course, how they can find the north star, Polaris.

For reference, I thought I would stick a British 2p coin on the wall as the Earth, and work out towards the sun via the moon.

2p coinIt turns out (and I didn’t know this) that:

  • The Earth is about 8,000 miles in diameter
  • The moon is around 2,000 in diameter
  • The Sun is about 850,000 miles in diameter

The long and short of it is this: If I stuck a 2p on the wall, the moon would be 78cms away away (about 2’6″) and the size of a pea. The sun would be 310 meters away, and 2.6 meters in diameter (7 feet or so).

Good, eh?

It was a good night. If you fancy doing this badge with your cubs, let me know. I have some flips you can have. If you are local, I also have an overhead projector which is great for displaying “real” stars on the wall 🙂

Callum.

2009 TDOTA

In 2009, rather than inviting the Girl Guides along, we put on a special event station instead and ran lots of stations, putting many people in the log. It’s amazing how many stations still haven’t worked the UK on 20m. Tim M0URX tells me that we still get QSL cards with hand written notes explaining how we are their first G (M) station. Superb.

Mega-Loop-Update

Not much to report this month and I’m only typing because I’ve currently got man-flu and feel like sh*t warmed up.

Hyper Mega Loop AntennaThe Mega-Loop is working superbly at the Scout hut, although I’m trying to find something better for 160m. The impedance is already slightly low on top band and with a 4:1 balun in line at the feedpoint, it seems throws the SWR out by quite a bit. The ACOM 2000 seems to handle such a mis-match, in fact, it only trips out with a return power equating to around 575 watts. Technically, does this means that I can fire 1,000 watts up the coax and have nearly 600 watts come back to me? I don’t know – and certainly not above 1,850 anyway (UK band plans & license conditions etc). I’ll need to check.

Here’s some fun. The picture shown is the design for a Hyper-Mega-Loop, this is twice the size of our current Mega-Loop at 340 meters in length sitting at 18 meters height with a design sag of 5 meters in the middle of each leg. Using MMANA, it seems to still develop amazing potential for 40m band. How about 8dBi at 10 degrees take off for the US? I wish I hadn’t thought this up, I’m tempted to build it. Yes, the RF will fire just North of West at around 285 degrees.

Last Monday night, Tim and James helped me to demonstrate amateur radio to the Beavers. We did a standard JOTA style 90 minutes with little ones starting with Morse code, continuing to QSL designs and passing greeting messages on 80m. Thanks to Chris, G0MLY who was was an excellent victim in managing the little ones pass their greetings message. Also thanks to the many others who helped including our friends, Barry (G0DGQ) and Chris (G0EYO).

Callum.

Wherethehell-Rwe 2009 Calcutts to Braunston Return

Wherethehell_Rwe Toy DuckThis weekend, we took the boat out for the first time as a family since the summer. Each time we have previously tried to take the boat out, we seem to have hit various mechanical snags and had to return home. This time it was the weather that nearly pushed us home. However my long lost genetics of the Outer Hebrides encouraged me to continue.

On Friday afternoon, we motored Wherethehell-Rwe out the marina via half-inch thick ice and up the three locks outside the marina. Luckily the ice finished at the canal. We stopped discretely opposite the tow path between Calcutts and Wigrams turn conveniently between two trees.

I have recently done some fault-finding with our marine TV antenna. This is the flying-saucer style one from Shakespeare Marine. I have raised it up 14 inches from the deck with their smallest custom extension mast and it’s made a fantastic improvement. I’ve also got a 4 foot extension mast too. It only takes a few minutes to add the large one when we’re moored up for even better signal quality. I’m extremely pleased. It means that in the main, each TV can now receive the big digital channels as well as Sky. Last summer, we only had Sky which was pretty annoying as we all had to watch the one Sky channel across all the TVs. Experiencing proper TV now on each telly has made a terrific improvement for all on board – and it even possible to receive TV whilst on the go! We can’t have Sky whilst moving though. I did look at it but it’s pointless for narrowboats because of the bridges, cuttings and trees etc. It would be forever losing signal.

I digress. By 6:00pm, we had the wood-burner flat out, the central heating on and a 500 watt electric heater in the back bedroom. We could only just keep the temperature up as the ice formed around the boat and dumped the overnight temperature to nearly minus 10 degrees centigrade. Not good for live-aboards I fancy. I have a cool electronic weather station at home that I have never put up, I might use it on the boat instead since it’s got a computer interface etc. It could be an interesting addition. I’ll let you know.

Wherethehell_Rwe Toy Duck Nearly an inch of ice had formed on the canal surface during the night which surprised me. I didn’t think it could form that fast. It certainly made a bloody racket though. Everytime you moved, it would scrape and groan on the hull.

We had a laugh as I zoomed blocks of ice up the canal for hundreds of yards, listening to the tinkling of the blocks skittering across the surface. We waited and waited for someone to be bold enough to come down our bit of the Grand Union canal but nobody did. Finally I asked a dog walker what the conditions were up at the Oxford junction (600 yards ahead) and he confirmed that boats had already broken the ice ahead. Wendy encouraged me to make a run for it, so at midday, we gingerly set off, my first ice-breaking adventure.

Getting out of the overnight berth was a problem and it took a bit of diesel to get the momentum and turning correct to actually leave the overnight berth and get the boat into the middle of the channel. I certainly left half a pint of paint on some of the ice plates. Wendy and the kids were quickly up in the bow watching splinters of ice flying out in all directions as we crunched along, virgin ice-breakers. Finally, we reached Wigrams turn and we could followed the tracks of previous boats.

It’s three or four lock-free hours to Braunston from Wigrams – probably less. In the main, it was an uneventful journey other than the tight bridge turns where the stern would catch on thick plate-ice and restrict my turning ability accompanied with a horrible paint-stripping sound as the stern dug deeply into the plates, shuddering against the boat.

Braunston Mooring

By 2:30pm we were at Braunston and after turning around by pushing our nose into Braunston Marina, we stole the visitors mooring directly outside the Millhouse where we received a great Satellite signal but no Digital TV (the pub is right in the way). Once moored up and the fire re-fuelled, we popped into the pub for a coffee (I mean Carling!) and watched the kids mucking about in the play area. I squared it with the barman for us to moor up but it turned out that they had a kitchen problem and advised us of a 45 minute wait for a plate of chips so we bailed out and strolled up to the village to check out the pubs and get a spot of shopping. We found the Old Plough in the High Street and promised to check it out later that night. It opens at 6:00pm.

That afternoon, Wendy and I crashed out – completely knackered because the previous night’s strange noises that had kept us awake as the ice froze all around the hull, however we soon had a second wind and took in the delights of the Old Plough. This is a pleasant pub but remind me to book next time, they’d had a rush on the place and we had to start our meal in the public bar where a skittles match was about to take place. Luckily, a table by the fire became free in the restaurant and they invited us to move back.

Once settled, Wendy started scribbling on Emily’s notebook. After a minute or two, she showed me what she had written. It went along these lines: “The woman right behind you rolled her eyes at her friend when she saw you come in to the bar. I caught her eye and she knew that I had seen her. She went scarlet red with embarrasment“! I immediately turned around to see for myself but the lady kept her head down very low all night in fear of what I might say. Ah-ha! The fun of having a leopard-skin print Mohican hair-cut!

Sunday morning was again very cold. This time without sun and it remained below freezing all day. It took me longer than usual to get some heat back into the boat. I switched on the 500 watt electric fire, sucking the batteries dry for an hour. Eventually at 10:30am, the mains tripped off as the Victron inverter shut down due to lack of DC available. Our four 110Ah batteries were almost out of real juice. This was my signal to start the engine and get the 5kW generator running. It’s also a reminder to get four additional batteries installed!

Luckily for me, a boat called Xenia came past as as I was preparing to cast off. They shouted over that the Oxford had already been ice-broken by someone else. Great! We needed to get back as the kids started back at school in the morning.

Wrapped up with two pairs of socks and a couple of heat jells on standby for heating up my hands periodially, we left the mooring at about 11:00am with a freezing wind on my cheeks. Wendy came to join me on the stern as we turned at the Oxford, west-bound for Calcutts. Nothing to report on the return journey other than the continuing amazing sights of the large sheets of ice up to an inch and a half think that would move out the way -or get snapped as we motored past. I kept the throttle a hundred RPM less than normal at around 900 so we made marginally slower time. I stopped for lunch at about 2:00pm which helped as the cold was starting to drill into me, however it turned out that we were only fifteen minutes from Wigrams Turn and the three-lock flight back to our marina.

As a coincidence, we shared the first lock with our marina neighbours, Muchgiggling who happened to be about 5 minutes behind us. They had been out since Boxing day and had had 12 boaters on board for New Years eve. Bet you they got plastered! They stopped for a pump out but warned me of a possible icy time in the marina. You bet.

Little prepared me for what I found in the marina. The outer marina was navigable like normal and just under the bridge to the new marina was also navigable. But clearly we were the last boat to have motored on this since Friday. I could just see our tracks in the ice from our departure. Nothing had moved since then. The ice was between an inch and maybe two inches in places and half-way across the new marina, it stopped us in our tracks. I reversed and applied full power and made efforts to keep the boat pointing approximately in the right direction. At full power and already going maybe four knots, the ice brought us to a stop – even with our 50hp Beta at nearly 2,000 revs. A single sheet of ice, thousands of tons in weight had us by the short and curlies. As a concerned skipper, I could only continue repeated attempts at the ice breaking to get us closer and closer to the pontoon, 2 meters at a time – and had it not been for a chap called Steve from a boat moored near our friends Graham and Jo, I don’t know how I would have managed to get moored up. Tony missed the fun, they arrived 15 minutes later not realising the seriousness of my predicament.

Anyway, a successful and enjoyable trip. I look forward to some more sunshine next time along with an early blacking!

Callum.

GB7HQ Amateur Radio HQ Contest!

In 2006, GB7HQ was actually GB5HQ. It was changed due to concerns by the CW crews that too many errors were creeping in due to misheard calls.

I originally wrote this article in 2006. It was published in the CDXC magazine in the same year. I’ve just remembered that I never published it here.


Fraser working GB5HQ

Frazer G4BJM

I am still pinching myself having operated the “beacon” station, 80m SSB as GB5HQ for my country along with Lee (G0MTN) and Fraser (G4BJM). Operating GB5HQ was the highest highlight of my hobby career yet. It inspired me to dig deeper and to discover more about myself and it certainly gave me the chance to stay awake for 24 hours!

Continue reading

Email from Scout Camp

Dear Mum and Dad,
Ted, the Scout Leader told us to email you now from the village in case you saw the flood on the TV and were worried. We are okay! Only one of our tents and 2 sleeping bags got washed away. Luckily, none of us got drowned because we were all up on the mountain looking for Adam when it happened.

Ted asks you to call Adam’s mother to tell her he is okay. He can’t use a computer because of the cast. I got to ride in one of the search and rescue jeeps. It was great! We never would have found Adam in the dark if it hadn’t been for the lightning. Ted was really mad at Adam for going on a hike alone without telling anyone. Adam said he did tell him, but it was when Ted was dancing around the fire with his beer so he probably didn’t hear him. Did you know that if you put gas on a fire, the gas will blow up? It’s amazing. Ted showed us after we tried his malt drink. He calls it fire-water. We discovered that wet wood doesn’t burn, but the tents do and also some of our clothes! I can tell you, Matthew is going to look really funny until his hair grows back.

We will be home on Saturday if Ted gets the minibus fixed. It wasn’t his fault about the crash, the brakes worked okay when we left. Ted said that with a bus that old, you have to expect something to break down. We think it’s a cool bus though and he doesn’t care if we get it dirty either. When it’s hot, he lets us ride on the bonnet! And it’s pretty hot with 24 people in a bus made for 18. He did let us take turns riding in the trailer until the traffic policeman stopped us and talked to Ted.

This morning we were all diving off rocks into the pool by the trees near the rapids. Ted wouldn’t let me because I can’t swim, and Adam was afraid he would sink because of his cast (it’s concrete because we didn’t have any plaster), so he let us take the canoe out instead… It was great fun. You can still see some of the trees under the water from the flood. Ted isn’t fussy like some of the Beaver Leaders we used to have. He didn’t even get mad about the life jackets. He spends most of his time clearing up the bottles and lying in the bus.

Guess what? We have all passed our first aid badges. When Andrew dived into the lake and cut his arm, we got to see how a tourniquet works! Steven and I threw up, but Ted said it probably was just food poisoning from the left-over chicken. He said they got sick that way with food they ate in prison. I’m so glad he got out and became our Scout Leader. By the way, what is a pedal-file?

I have to go now since we’re going to buy some more beer, rizzlas and air pellets then head back to camp!

Love,

Jimmy xx

160m SSB Club Calls Contest – November 2008

Dorridge Scout Group M0XXT HQ107 in the log. I’ve no idea what my score was since I used N1MM’s DX Serial Contest template to do the logging and the miscellaneous field for logging random text did a hopeless job of being able to edit long club names efficiently.

The last time I entered this contest, my log was called into question when the adjudicator asked me to clarify what I meant by the club station “Reading”. It transpired that there was only one radio club in Reading anyway. I vowed not to do this again but I’m back.

This year, I had the added luck of G3WZT CQing 1.7kHz up from my run frequency of 1.903 MHz on the off at 8:00pm. Yes, I had been talking to James for about an hour prior to the off and yes, of course he would have noticed me there – but his deep concern for our predicament was (to use his words) “tough luck”. John, thanks a lot, 1967 RAE passes were obviously excellent vintages. I’ll endeavour to remember you next time and offer you my run frequency quicker than you can say, “I’m a G3 and I certainly act like one”. I wonder if you behaved like that in 1967 when you had a fresh RAE pass in your pocket and a 12wpm ticket?

Luckily for me, the scout hut was warmish during the event so I wasn’t doing my normal teeth chattering. I took a 20 minute phone at 10:00pm from Wendy which gave me a break but I missed a few because of it and then S&P’d for a while. I notice that there were actually very few clubs playing which was strange. I would have thought this would be more popular. EI and DL stations were playing too, giving Non Member reports bar one DL who gave his full radio club, bless. I wrote Non Member in my log but didn’t tell him so not to cause any upset!

Absolutely nothing wrong with the antenna; 174 metre equilateral triangle at 85 feet fed with 4:1 balun and coax in one corner. It had good ears. Only three stations I gave up with and two of them were in mainland EU; a PA and a DL. M3s (and M6s) were heard well on their 10w. I notice last year’s top score made 130 Qs which was a reasonable benchmark so I’m fairly pleased with 107 bearing in mind the proximity to “John the G3” and that I had to take Wendy’s important call at 10:00pm. I could only make more if I was either slightly more lucky with the G3s – or played more seriously with SO2V.

Will I do this contest again? Well, I’m not used to a) the quality of operating (come on, it was a bit geriatric) and b) I’m not that keen on the rules. Even just logging the Town would do justice to copying something interesting and different, but logging “Wensleydale Cheesmakers Transmitting and Electronics Amateur Radio Society” is a bit of a mouthfull. In light of the fact that this contest is apparently a route to getting newbies interested in contesting, forget it. Committee, do yourself a favour and get into my head. I have M3s that want to operate. Give them something they can do and build their copying (and confidence) skills, not drown them with difficult reports under heavy QRM.

Anyway, Sunday’s Remembrance Parade was fabulous. I was back to Front Rank Drummer again after all these years. Great!

73

Callum.

2008 CQWW

James and I entered CQWW as a Multi Single event. We did a lot of learning that weekend and came back the next couple of years aiming for a top 10 in EU, quite successfully.

Waterproof PL259 connectors for Ecoflex

Waterproof PL259 ConnectorsI’ve been lucky enough to purchase 100 meters of Ecoflex 15 recently and the solderless connectors are awesome.

Available for Aircell 7 (RG213 replacement) and Ecoflex 10 (Westflex replacement) and this giant 15mm diameter stuff, once fitted they are completely waterproof.

My experience with all these products started with me laying down a few runs for my narrowboat earlier this year because I wanted a low RF leakage product. More recently, I’ve rebuilt most of my spare patch leads with the remainder of the Aircel and Ecoflex left over from the boat build. All my RG213 and Westflex has been relegated to tutoring and testing.

Callum.

SSB Field Day 2008 – M0XXT

2008 will go down as a wet year. Both VHF NFD and SSB FD was a soaking experience. Luckily, as with most close knit teams, we laughed it off and worked through it, however a tough act all the same.

Lee G0MTNArriving at the site on Lunchtime Friday, I got the tent up in a complete hurricane. Stripped to my shorts and a T-shirt in the driving wind and rain and all on my own, at one point I just burst out laughing at my predicament. The only thing that kept me sane was the knowledge that some other crazy people in other parts of Europe were also following my example and getting their stations worked up.

Finally at about 15:30hrs, I had a tent up – and all the tent pegs used up, a sure sign that I had screwed the thing hard into the ground. Sporadic rain continued as Terry and James arrived to part assemble the A3S.

Eventually, James and I were left to our own devices to continue building the working station in the tent, networking the machines and arranging the PCs etc. Still, no antennas had been erected.

After our meal in the evening, a quieter weather front descended on us and with still an hour of light left, we put up the 60 foot mast that would house the 40m and 80m fan dipoles. We kept pushing and pushing, even firing up the lighting rig to give us 10kW of light to finish the job (at 1:00am in the morning!). Both dipoles tuned fine, fed off a single 1:1 balun at the top with Westflex straight to the tent. Only the A3S to mount in the morning.

Indeed, with Terry and Lee’s help, we had the A3S up at about 10 meters by mid-morning and we ran a few numbers whilst checking N1MM’s implimentation of Reg1 Field Day. Unfortunately, I missed a trick and for the whole contest, we ran without automatic multiplier recognition. Scoring was right, mults weren’t. What do we all tell everyone to check? The software. What didn’t I do? Grrr! Plonker!

With a couple of spare hours left, I erected the RX loop on a spare mast on a Barenco wheel clamp, running some RG58 back to the tent. Big mistake since the coax “leaked” too much which meant that some bands were difficult to spot due to proximity to the TX antennas – even running Barry’s new Stub Filter switch that he had made for us – but we’d just ran out of decent stuff.

The next 24 hours was a blurr of operating, cups of tea and running repairs. The only real thing that let us down was the 1:1 balun driving the fan dipoles on 40 and 80 which seemed to go open circuit. At 7:30pm on Saturday evening, we dropped the mast, stripped out the balun and directly connected the coax via a spare dipole centre. This meant that Terry carried on running on 20m for longer than he wanted but the propagation came back and he ran a string of West Coast stations prior to dropping down to 80m. Maybe a blessing in disguise?

Lee’s Saturday afternoon stint was taken over by Terry and both left the site by dinner time to leave James and I to run the night shift. Doing half-hour on and half-hour off, we managed very well. It was one of the most interesting night shifts I’ve done. I think staying fresh with only 30 minute stints may have helped. On the other hand, sometimes I wanted more time on the mic, but as a compromise 30 minutes seems about right.

Big contests aren’t right without the obligotary ZLs and VKs early on 40 meters and we were pleased with a small crop of these. Fresh as a daisy, Tim and Terry arrived back on site within half an hour of each other at around 6:30am to allow James and I to hit the sack for three hours sleep, rising just before coffee time in the morning.

I hate the last couple of hours of the /P contests. I know it all has to come down and everything needs packed away again so to get ahead, I dropped the RX loop and packed away the second receiver station, neatly arranging everything in the tent door before lunch.

Blur descended on us. Looking back, everything is in speed-up mode. All I can remember is getting in the bath at about 5:00pm on Sunday night knowing that the car was still jammed with gear.

Enjoy the photos – and write back if you like my drivel!

Cheers and beers,

Callum, M0XXT Team Owner!

JOTA with GB1DSG

JOTAMassive success this year with the new antenna, generating huge pile-ups world-wide. We shall never go near 80m again for JOTA. 20m is the band that synchronises extremely well with passing Scouting messages around the world, particularly if you have a technically proficient station and crew.

I notice Tim (M0URX) has done a little write up of this event here:

Needless to say, if having ones Cub pack sending their greetings message to the Father in Law to the Crown Prince of Brunei isn’t one-upmanship, I don’t know what is 🙂

It is just for me to say thanks to Tim, James and Terry for helping me put on such a sterling event. The QSL cards have started arriving already! Fabulous.

73

Callum.

CQWW – M0XXT Report

This year, James and I ran M0XXT at the Scout Hut using a pair of XXT Mega Loops; a full size 160m version and a half-sized one which suited the top end of 80m and 10m. Full-sized Mega Loops don’t work on 10m. I ran out of time to put up a TX vertical for top band, even though I did finally finish making it ready for tuning by Saturday morning during my “off” times at night. Another job for next year.

M0MCX running M0XXT CQWW 2008RF was via one of our FT1000MP radios and amplified by an ACOM. A pair of Dell PCs running N1MM did the logging. We networked the PCs for disaster recovery purposes and used the second copy of N1MM on the spare PC a couple of times when RF shut down the run machine. We were Multi-Single.

The antennas really worked miracles, showing almost unbelievable gain which in the main distil to 6 equally spaced compass fingers or lobes – with the main RF being squirted at around 290 degrees (since it’s slightly twisted off it’s X axis due to the perfect location of the local oak trees for USA propagation). I won’t bore you with the compass bearings, it is suffice to say that these RF fingers cover most high density population areas of the globe. The whole topic of these XXT Mega Loops needs a chapter to themselves and as I write this on Monday evening, I can report that this afternoon I ran a huge pile-up to the west coast US at about 16:00z, at one point switching the amplifier off and continuing to run the pile up with 10 watts (!) which reduced our average incoming signal report to 5 and 7 from 20dB over S9. Even on 40m, the gain figures are healthy with 5dB at 10 degree take off angles to the US. 80m is just a big bubble of RF but with the antenna at 90 feet elevation, at least the bubble has some flatness to it. Same with 160m – hence the idea of a massive vertical.

No real technical surprises this year. Everything worked out first time, only after updating SCP did I realise that M0XXT wasn’t shown in the database! What a numbskull. I meant to drop Randy a line to ask for this new call to be added. Having our call queried heavily was quite normal and tedious.

Strategically, we didn’t really have a plan. We believed we would conquer the world and be louder than anyone else(!). We’d just shout louder 🙂 Of course it doesn’t work like this and after my 6th CQWW, I can genuinely say that I was yet again blown away by the strong signals on 40m. I even reminded James that this would happen, but it was worse. Isn’t it always like that? This damned loop might be great on TX but you can’t dial out the QRM! I feel some receiving antennas coming on..

I can’t remember when I slept. I do know that between Friday morning and Monday morning, I had 5 and a half hours of the stuff and my diet consisted of everything that the Weight-Watchers lady took me off! I haven’t eaten like that since I was 18 🙂

As a team, we had some fabulous times scoring 97 countries on 20m and 92 on 40m. We wanted DXCC on both bands but it wasn’t to be. Had we known that 10m was going to close on Sunday, we’d have spent more time increasing our multiplier-score on that band during Saturday. Experience counts and we lack quite a bit sometimes.

W3LPL spotted M0XXTI personally had a couple of exceptional highlights that I’ll remember for a while. The first was on Saturday evening, running a split to the US on 40m and getting a pile up for my money. The rate meter peaked at 230 which I thought was pretty darned good. At one point, I burst out laughing with a mixture of adrenaline rush and terror! I have never had a high-gain antenna to the US and just didn’t think that it was possible to have so many people calling you! Getting spotted by W3LPL made it worse (or better..!!).

The second was during the last half-hour of the contest. We happened to find a tiny gap at the bottom of 80m. I was happy just to score a dozen stations and wrap the deal up. Instead I had another pile-up after being spotted by an EI station. When I remembered to look, the rate meter was at 199 whilst I worked 60 of the bigger ticket Dubyas side-by-side DK and PAs inside 30 minutes. Showing off? You bet! Just fantastic.

Most of the time, we doubled up on the headphones with the spare man checking email and stuff, on standby for some nasty QRM busting ears. N1MM has the CTRL E feature for shooting messages to each other. We used this to fire callsigns at the runner to help them out. Well, I happened to hear an Italian station call us and he used our callsign so we didn’t confuse his call to us for someone else. His pronunciation of “Xray Xray” can only be described as “eggs-ray eggs-ray”. I thought this was quite funny and shot it over to James using the CTRL-E feature. What happened next is one of those moments where everyone gets the giggles. I had to run out the room and laugh out loud in the park (in the middle of the night. No wonder the locals stay away from me!!).

The precise scoring is on a memory stick so I’ll have to report that another time, however we made just under 1.5 million points – and although the station was running for 48 hours, we had plenty of downtime and research moments. James and I can be accidental science professors and it’s unfortunate when a great idea for a piece of software or a new antenna pops up. Everything has to stop while we consider it. Of course in the middle of a decent run this is impossible but band changes can slow the rates down to a dribble. The mind wanders and before you know it, we’re demonstrating a new system of antenna erection or a complete re-write of N1MM. What a hobby!

As I was drifting off to sleep last night (like a breeze block!), I remembered a load of lessons learned topics to write down. Now I can’t remember them. My top tips therefore rely on my favorite topic; having fun. It’s just a game.

73

Callum.

XXT Mega Loop Update

XXT Meage LoopSaturday / Sunday saw us tear down the minutely designed and executed 28.5m leg triangle and on the spur of the moment, we put one up twice the size. It only JUST fits at 57 meters each leg, and again this is a perfect triangle. At 20m in height, we should have experienced nearly 15dBi towards North America and sure enough we ran a string of US stations all Saturday and Sunday scoring on both days into California with signal reports in the 57s and 58s. Exceptional. But these lobes don’t just work into US, we worked Ethiopia, Brunei, Bermuda, VK9, the list goes on and on. This is a serious loop and great fun for running on – it’s also nearly invisible!

For the geeks, this is essentially a perfect triangle – and it HAS to be a perfect triangle otherwise you won’t get these high-gain lobes. Squares and circles are for the low band cloud warmer brigade, this is for the higher band DX hunters and goodness did it work well. It’s an instant pile-up generator.

Shall we use for CQWW? You bet – and we’re looking forward to a couple of thousand contacts and I’m so impressed with it, that I might put it up again next year for SSB Field Day since as an all-band antenna, it works from 80m upwards. Indeed, it will also work most comfortably on 160m (since it’s really a single wavelength for 160m) but we rarely go down there.

Look out for my Jamboree On The Air report where I’ll discuss this antenna – as well as our success with the Beavers and Cubs last weekend. Needless to say, if having one’s Beavers passing greetings messages to the Father in Law of the Crown Prince of Brunei on 20m band isn’t one-upmanship, I don’t know what is!

73,

Callum.

Firing guy wires over 100 foot trees

My other recent article discusses our XXT Loop that relies on three very high trees equally placed as an equilateral triangle would be. Initially, my design focussed on a 2 wavelength loop for 80m. This required not only a serious amount of high quality copper wire but some extremely capable trees!

Cutting the design by half had some advantages, namely I needed only 80 meters of hard-drawn copper wire instead of 160 meters and I could trade off the whole of the scout field into something a little more manageable – three trees nearer the shack! Luckily, I recently found 600 meters of high quality enamelled antenna wire going for a song (eight quid actually!) which has assisted this experiment 🙂

XXT Loop

Anyway, I drew this to scale using Google Earth and Paint Shop Pro and had my Cubs measure the trees one night as part of a badge (very satisfying!). It turns out that these trees are in the 85 to 100 feet feet category, the real Daddies of the local Oak Trees! Of interest, if north is “up” and the feedpoint is over on the far right, the major gain is over to the north west area (WNW to be precise).

Getting rope over the top of these trees was a real test and over the last few days I’ve been doing some major development work into designing something that will reliably shoot a fishing wire over the top of these. May I say now that once I had perfected the “gun”, it is certainly one of the most satisfying and exhilarating events to shoot a weight over the top of a 100 foot tree watching tens of meters of fishing line fly off every second as it lofts over its target. An amazing experience to have it all finally working in perfect unison.

I can hardly bring myself to tell you the precise details of how you can achive this since it cost me not only a few pennies in wasted fishing reels but many frustrating hours (days!) with various contraptions before I hit the nail on the head reliably every time. I know you can buy such “guns” in the USA, however if you really want to accomplish this on a home-brew front, you can either email me with a very grovely email or buy me copious amounts of beer in the local pub to extract the truth!

Catapult Fishing Rod Gun

Since a picture paints many words, I’ve attached pictures of both failures and successes. In the catapult / fishing reel ONLY picture (the first one), the line is essentially too close to the catapult and upon launch, it snaps all too quickly or jerks the weight down to the earth immediately.

Using the extended fishing rod though means that the line is longer which takes up the initial jerk much better as it all takes off. The breaking strain is critical. Too low and it snaps, too high and it’s too heavy and doesn’t reach its target.

Finally the weight. I found that in most cases, a single 10mm heavy stainless nut was suffice. However late this afternoon, a particularly high tree was proving extremely difficult. I needed the projectile to travel further and ended up moving to three 10mm nuts. Exerting as much force as I could muster (more than ever before) I launched the three nuts at the top of the tree and whooosh, it all went over. Extremley satisfying since had I got that wrong, I could have easily crushed a finger or have the nuts fly off into the countryside somewhere. Quite worrying actually, all that force going wrong (indeed having my nuts flying off into the countryside would also have been worying!).

Catapult Fishing Rod Gun

Of course, once the nylon line is over the tree, one has to track it down which easier said than done. Walking around a field looking like a dancing fairy with arms out-stretched to find the line has the locals glaring hard – but the most effective. I tried lacing ribbons and coloured string to track the projectile but this just caused jams and further problems.

Once found, attaching a strong cord is the next battle. Luckily, I have studied knots keenly over the last 18 months to become the district knot champ, however I soon learned that having a knot that would actually undo under pressure was best, not only for the weight on the line but also for the cord. The last thing you want is a stuck weight or cord up a tree. Before I worked this out, I lost about 50 meters of line in a tree in smaller increments. It  glistens most interestingly in the sun. I only hope it breaks down and disintegrates next summer because the thought of it up there is most embarrasing. In the end, I discovered that applying small amounts of duck-tape so that in the event of a stuck line 100 feet in the sky, a hard pull would allow the weight to drop to the ground and the line to spring free. It’s a better solution.

I recently found some genuine American paracord from a supplier on eBay. It’s not cheap but it’s very strong and doesn’t seem to stretch much. I bought a 200 meter run. It has a 500 pound breaking strength so I’m guessing half that is a safe working load. Basically, if I can pull it with all my might, I’m happy. Attaching the line to the cord and pulling it over slowly normally did the trick – well, most times. Sometimes it doesn’t want to play so I discovered the best method of attaching my lines to my paracord to reduce that issue. I’m not telling you which method I discovered since that’s worth another pint of local ale!

Finally this afternoon, I am left with three trees with paracord running all the way up, all the way over and all the way down again. I’ve tied them off using step ladders so the local youths don’t muck with them.

Tomorrow is antenna build day. Wish me luck. I’ll let you know how I get on.

Post Script: Good news, the antenna worked a treat, see: https://www.m0mcx.co.uk/?p=138

73,

Callum.

Living in Monte Carlo

I posted this here: http://www.yachtforums.com/forums/yacht-crews/10048-my-life-monaco.html#post65529

I have memories of my time based in Monte Carlo as a Steward on board Milamba IV, a 108 foot steel displacement Feadship with a very British (Campers and Nicholson refit) style and British crew.

Milamba IVIn 1979 I had hitch-hiked to the South of France after dreaming of someday working on a luxury yacht. I was 18 at the time and the 6 months I was there has since become quite a fantasia of memories, from serving Robert Mitchum dinner (he really was very tall) to having the smart Italian men on board for lunch off the Islands on Cannes. Most of the visitors were extremely secretive, some I recognise now as heavy-weight industrialists on the TV, in those days they just flexing their young muscles.

John Ryan was my Boss, he was the last Chief Steward of Queen Mary (yes, the first Queen Mary!). We had a Canadian Capt and his younger brother John, our engineer. Gary, a former Royal Navy diver was our deckhand with Peter dropping in as a Chauffeur / spare deckhand. A Glaswegian, Grant was our chef. All in all, for an ex Public School preppie like me, it was completely normal. Crew quarters were cramped with three small twin cabins and tiny mess; U shaped dinette and combined lounge facing a massive row of freezers huddled up in the bow. We had enough food to last most people a lifetime. The Captain had his own cabin near the bridge.

When we were at port, my job started at about 6:30 in the morning with a cup of coffee and a Marlboro whilst hanging out the side door of the galley bathing in the morning sun. Once dressed in smart white trousers and yacht-branded T-Shirt, I would start the brass polishing, dusting and vacuum cleaning. We had a lot of brass, particularly the banister rail from the owner’s cabin to the saloon. On a number of occasions, I would put the Brasso on and forget to polish it off! The Boss wasn’t happy.

During breakfast, I dashed into the cabins and made the beds and cleaned the bathrooms. This could be a busy day if we had guests and I would sometimes negotiate with them as to the best time to do their cleaning. The best answer was of course, “don’t bother”!

After breakfast, Ryan and I would clear away and I’d wash up. If we were in Monaco (our home port), at around 10:30 fresh flowers would arrive. I would spend time with “Madam” to put them out. I had a bit of a crush on her. She was quite young and really nice and pretty!

Often we had lunch visitors so I might go into the market with Grant mid-morning to get some fresh food in. He used me as his “mule” and would load me up with lots of bags. He always insisted on shopping in full chef whites, branded accordingly with our yacht name etc. I was very proud of him as the sellers would insist that Grant come to the front to the queue and the locals would all stop and watch us. Grant would be offered free samples of fruit or maybe some fish. He would nod accordingly and then promptly order in his deep Scottish accent. He couldn’t speak French at all and it was extremely funny watching him negotiate for quantities. He would complain to me when the conversation would stall and he would be left wondering what he’d ordered! At least I could speak some of the local lingo!

Nearer lunchtime, I’d help him as he rushed about preparing some exotic meal. During this slack period, I often became his kitchen porter, changing out of my white T Shirt and donning an apron to wash his horrid pots!

Milamba IV PortsideAt lunch, Ryan would normally ban me from entering the saloon whilst the visitors arrived and mingled. Sometimes, he forgot and I would help until he ushered me out. He liked the limelight I think and didn’t want me cramping his style. From the galley, I would hear the guests laughing. Sometimes, he would bark at me to follow in behind him with crisps and nuts etc, but mostly he had me as back-up on stand-by outside the galley. Often, Ryan and I would just stood to, outside the galley, our ears alert to the sound of the tinkling. Finally, Grant would indicate that he was ready to serve. Ryan would give me a little smile, he would calm right down and say, “regardless of the pandemonium we’ve been through this last 90 minutes, now we must be Lords and walk in with our heads high and our standards at the same level. Are you ready?” It always amused me when he told me to act like a Lord since I always they were drunk, however I knew what he meant!

The guests would marvel at me being so polished and young (I looked about 14!). I remember the Boss telling me to serve him from the “wrong side” once because of the extra visitors we’d had that day, I couldn’t get past to get to his left. The entourage chuckled with him at my predicament. Of course, eventually they’d all disappear drunk into the afternoon sky and the Boss would go down for his 2 hour sleep and calm would descend.

Afternoons were often very peaceful. As crew, we were allowed to sunbathe on the bow amongst the anchor chains etc. Sometimes I would wander off to the bar in the town, overlooking all the yachts and sit there sipping a Coke, marvelling at my very strange life. Of course, some afternoons were very busy and we’d be dragging our anchor (and everyone else’s!) off the bottom of Monte Carlo harbour just to pop out for a couple of hours of show-off time. Sometimes, “Madam” would have a friend on board and I could hear them giggling when they pressed the button for me to turn up on the boat deck. They found it very amusing to order drinks and snacks off me and they’d giggle when I turned up. Once, her girlfriend (I think her old “best friend” from school who came visiting for a few days when the Boss was away) intentionally let her bikini-top slip down and they both howled with laughter, slightly tipsy. Of course, being so young, I pretended that life was completely normal like this.

Every Friday afternoon, we sailed to St Tropez and parked stern-in right opposite the Gorilla bar (La Gorille?) making a huge show for the holidaying public. We would be on best behaviour, throwing our ropes and fenders about to best effect. Madam would be calmly sitting on the aft deck with Mr Boss whilst we put the best show on town on. The crowd would marvel at our skill. We became “family” for half an hour for the benefit of our egos and the Boss’s approval before going back to our normal bickering selves.

Mostly, Peter will have followed us to St Tropez in the Boss’s beautiful mahogany twin Chrysler V8 Riva powerboat. I adored that boat with its cream leather seating and vast engine cover to lie down on when it was whooshing along. On Saturday afternoon, we would usher the Boss and Madam to one of the beaches using our Zodiac as a kind of backup. We would act like MI6, delivering our cargo to the richest beach in the world, leaving a crew behind with walkie-talkies to stay in contact with Mother-ship!

On Saturday nights, we’d take turns in keeping one crew on board whilst the rest went to the bars in “civvies”. The Boss and Co normally went off to their friends’ houses or local restaurants. They didn’t go out for late nights, arriving back by 11:00pm. I was always extremely courteous to my Boss and when it was my turn to “baby-sit” him, I would try and make him laugh. I was after all, very happy that he’d given me my dream job. Normally he ordered freezing cold Vodka or sometimes a hot chocolate. I was always happy to get him what he wanted. Once, recognising my keenness to make him happy, he pulled a wad out and gave me a 100 franc note. He swore me to secrecy not to tell a sole that he’d given it to me, not wanting any backlash from the other crew I guess.

In mid-summer, we sailed to Venice, a three week trip which we all really enjoyed, weaving through the Greek islands. The crew laughed their socks off at me when the Captain told me to get on the boat deck and push the huge electric cables over the top of the radar mast with the wooden boat hook as we went under the cables strung between Italy and Sicily at the Messina Straights, “You won’t get electrocuted Callum!”. Of course, as we came closer, they went above the boat by around 500 feet or so. I felt a real dumb-ass. When I climbed back down into the bridge, Madam had obviously been let in on the secret and gave me a Mummyish smile (woops, that crush is coming back!).

That night, we were given a bit of leave and we headed into Messina to have a drink. 30 years ago, of course Messina would have had a fair amount of organised individuals, controlling trade and luckily for me, if you are an innocent working for a Boss who was happy to stop at Messina to meet his friends, my wallet and passport were very safe. In the morning, they were still lying on the same table I had left them on the night before. Friends in high places indeed.

The Greek islands are beautiful and we stopped at some amazing places including Kos. The harbour was so small, we only just got in, turned around and docked by the main wall (if only we’d had had digital cameras in those days). Work on board was extremely light whilst cruising. Little dust meant less work for me and the days were spent lazying around on the foredeck, waiting for that little bell to tinkle. At least we all spread the load. Poor Gary spent one day chipping, the next day red leading and the next day applying fresh new white paint. Rust, red and white. I’m sure it wasn’t that bad, but that’s all I remember him doing on that cruise. Cleary the trip from Southampton to the Med had started the rusting process. Perhaps it should have been shot-blasted or something during the refit the year before?

Venice was marvellous. The Captain explained that if we got up very early, we would be arriving as the sun was coming up. Sure enough, watching the radar screen, I could see the channel ahead and finally, opposite from the famous St Marco square, we parked our toy ship between 4 massive anchor stations; these are those wooden structures that apparently are full of bats. This was 30 years ago so maybe times have changed, but health and safety was certainly not on the agenda then. John, Gary and I had lots of fun taking our lines to them in the Zodiac and they made me climb up onto them to slip the line through. As I did that, a load of bats would fly out. Ugh. I was screaming and the crew were laughing. I was such a girl back then.

Milamba IV in VeniceIt was in Venice that Robert Mitchum and his wife came for dinner. A most polite and graceful man, even though he was huge – really huge. Those original Hollywood stars really were amazing guys. For some reason he knew my Boss really well and they hugged when he came aboard. A load of TWA execs also came for dinner and they all speculated about Howard Hughes and wondered if he really had died. Clearly Howard couldn’t have been dead long than and it was still hot news. Mr Mitchum shook my hand when he left and thanked me for a pleasant dinner. His hands were the size of dinner plates. The only other time I was so affected by another man was Sir Ranulph Fiennes, who thanked me once when I bought his book. It’s like he looked right into my soul with his huge blue eyes. Just like Mr Mitchum did all those years ago.

The Boss and Madam flew back to London from Venice telling us they’d meet us in Nice in a fortnight. We were to have a holiday. We filled with fuel, a 110 tons of diesel apparently, which took hours from a local fuel barge. Why tons and not gallons or litres I wonder..? It was just as well that we filled up since we hit a calamity of a storm coming down the Adriatic. The boat was tossed about like a 10 foot dingy. The Captain was so hell bent on getting back to have a holiday that we were 45 degrees to the waves and the stabilisers could only do half a job most of the time – they were wings, not stabilisers and we clattered over to 45 degree rolls. Only the tons of fuel deep in our belly kept us upright. The twin screws were rattling their bearings dry on many crests. Thankfully I was completely unaware of the dangers. I’ll bet we dumped some diesel through those Caterpiller engines though since we were at Sardinia within a couple of days anchored off a lovely beach. We did some skiing off the back of the Zodiac and some Scuba too. Gary and I shared a single tank and sat on the bottom at 30 feet, looking up at the hull in a crystal clear sea making the OK sign at each other. Great fun. Gary liked to think he was teaching me to be a Royal Navy diver I think!

In the evenings, we took the Zodiac to the port and of course, in the best traditions of sailors, got completely hammered on the local booze.

After the Venice trip, a thorough bout of depression hit us via an anti-climax, only the news of a mini-trip to Nice to pick the Boss up sparked us into reality. I remember a flat calm, perishingly hot day with the quiet hum of our twin Caterpillers driving us ever forward with me, sitting astride the chrome bow sprit, looking down at the bow wave. Mindless days. We were pleased to see them when we met on the dock, and he us. A family again.

The end of the summer was looming and yacht crews were busy swapping jobs. Gary was excited about a promotion to another boat that we’d often bump into in St Tropez. John and his brother, the Captain were staying on as was the brown-nosed Peter. Clearly Ryan was at the end of his career and was stuck to the Boss like glue while Grant I believe, wanted to go back to Glasgow. Our lives crossed like ships in the night. I often wonder what happened to them all.

In early September, we started getting the boat ready for the Caribbean, an Atlantic crossing. Apparently a Lloyds crew were going to sail the boat there for Christmas. Of interest, I was offered a full-time job either on the boat or back in London looking after their Mayfair apartment, however I had had the taste of the high life and wanted part of it. I couldn’t do that working as a servant.

I have dreams of being back there working on the boat (we called it the boat when we worked on her). More recently I actually dreamt that I had discovered her rusting away in a Liverpool dock and I bought her for £125,000 UKP. Typing these memories, I thought I’d do another Google search and found a 2005 advert for her. I’ve saved the pictures. She’s had a flying bridge added which I think ruins her very 50’s style (although of course, a 1970’s yacht) and now called Lady Andrea.

Anyway, I trust you’ve enjoyed this little ditty from 30 years ago, it’s been rather pleasant writing them down. Apologies if I’ve rambled on a bit.

Cheers and beers.

Callum.

New Winter 2008 CQWW Vertical

12m Spiderbeam Vertical

When the kids start to play less outside in the winter, I like to experiment with a new vertical each year. This year it’s a 12m spiderbeam vertical fibreglass pole loosely wound with some hard drawn copper wire. A waste pipe supplies the engineering for the radials with the SG230 doing the matching. This allows me 200w of SSB, in other words, a direct companion for a non-amplified 200w FT1000MP Mk5.

Thankfully, James (M3YOM [yomSOFT author]) popped around last Sunday to help me slide it into an old Barenco 2 inch coupler. This mounts on a steel 51mm outside diamter tube which in turn slides into a plastic mini-drain-pipe that has an internal diameter of 51mm from B&Q DIY store – all a perfect fit. I concreted the plastic pipe into the ground in June before the summer hols. It goes about a meter down.

In terms of its performance, it only really works well on 20m and 40m. The rest of the bands are a wash out but as a 5/8th vertical on 20m, I really am getting a couple of db gain over my other antennas. 15m band is comparable to my little super loop and modelling confirms this. 10m of course is hopeless because it’s longer than a wavelength. Until my 2 element SteppIR turns up, this will have to do.

In testing, I was lucky enough to discover a contest closing but with US stations keen to make a last for contacts on the 40m band. Clearly, it’s a winner there and the aerial allowed easy QSOs with a nuber of contest stations in the US. On 20m too, I scored with a number of US stations at around 21:30 local time on Monday eve when the band was still open. Since then, I’ve had lots of fun with it.

Lessons learned? None really. It’s a heck of a size for just two bands though and it sticks out like a sore thumb from all the streets around here since the top is sitting at just under 60 feet. Clearly last year’s version was also a 40m and 20m model but I didn’t realise that then. I did though speak to 23 countries on 160m. I’ll be interested if it still has any top band performance this year – or was that a fluke..?

73.

Callum.

ACOM 2000 Flight Case

Thanks to Nigel at Castle Cases, I now have a first-class flight case for my beloved Acom 2000 amplifier, all for less than £250.

ACOM 2000 Flight Case

Built up from a 9mm touring-quality plywood with aluminium fittings and steel corners, clasps and handles, I’m hoping this will last me a lifetime. I particularly love the hex-effect ply finish which is Nigel’s standard offering. Nigel came up with the idea of building a platform for the amplifier so that I can still get to all the connectors on the reverse and the on-off rocker switch on the front panel. This has a dual effect of allowing a neat storage space for the three-pin plug and RS232 linked remote control panel.

I had a case built for a couple of reasons; a cross between safety and convenience: To transport the Acom reliably in its carboard box, one needs to split the transformer from the amplifier because of the weight. If you try and lift an Acom 2000 on your own, you could easily end up with an accident. Removing the transformer effectively takes about 15 kilos out the amplifier, making it a lot easier to shoe-horn it into its box but it takes forever. Of course, the cardboard will only last a few years too and will gradually become worthless. Who needs a box now..? I drove off today and left Nigel with my cardboard (sorry Nigel, I was going to take it away but forgot!).

Going through the trouble of removing the transformer means that I was loathe to pack it into the boot for field days and Scouting events. But having it sit permanently on it’s flight-case tray means that it can come out to play more regularly which means more QRO fun 🙂

Custom made flight cases from Castle Cases here:

Cheers all (thanks lads for the coffee too!)

Callum.

 

Kenwood RC-2000 Remote Control system for TS-2000

Kenwood RC-2000I’m pleased to report that after soldering hundred of connectors last Friday afternoon, the remote head for my marine-style TS-2000 installation worked perfectly, even though we had extended the head by 70 feet (21 meters).

How did we do this: The remote head requires extensions for a) 8 pin Microphone b) 2 core loud speaker and c) 4 core data. I had heard of a number of people complaining about RF feedback and other such “funnies” so I reduced the problems by over-specifying on the coax run (Ecoflex 10) and going completely over the top for the 8-pin mic and data cables.

The 8-pin microphone connector was a heavy-duty 8mm screened 25m reel from Farnell components at £90, expensive – but I felt worth it. The data was shoved down a neoprene style 4-core professional OFC microphone cable, as was the loud speaker.

The reason for the OFC microphone cable was an alert I had from a user on one of my Yahoo Groups suggesting that unless I used top-quality cable, the high frequencies might roll off on TX. Not being able to change the installation once the boat was built, I had no option but to buy the best cable I could find. As it happens, the audio is currently routed through the 8-core Mic lead, however I do have the option of running the mic audio through a spare pair from the professional microphone cable.

Tests demonstrated that nobody was wise to our remote head. No interference was discovered whether on our outgoing signal, nor on our data lines or speaker and control lines. Not one ferrite clip was used. Remarkable.

A first class effort. Thanks to james (M3YOM) for doing the soldering!

VHF NFD Report 2008 – Double X-Ray Firm

M0XXT/PCollectively, we have extremely limited experience with VHF. It came as quite a shock to the system to score so few QSOs relative to HF contests that we enter; we are used to scoring 1,500 contacts in a weekend. I must say that the turn-out felt positively low. Is this really the state of VHF contesting in the UK..?

Our location couldn’t get better for a Midland club; 1,000 feet high with easy access on private land (IO91bx [edited, did say IO92bx..!]). The weather was a different story with both the consistent rain and very high winds contributing to some scary moments. Why all three antennas were still standing on Sunday morning, I can’t understand however the guys, stakes or poles didn’t move an inch. Perhaps a testimony to all my recent knot learnings at the Scout Hut!

With limited resources on VHF, most of the gear had to be procured recently to enter this event including a 17 element Tonna and a three element Moonraker beam for 6m. A couple of months ago, we bought a strange X-Quad affair for 70cms which after completely stripping down and rebuilding last week, appeared to work well but we have no way of comparing it to anything else. [Edit: since found out this is a Jaybeam Multibeam, 48 element 12dbd ATV type antenna circa 30 years old]. At 2m long with zillions of elements, I trust it’s as least as good as the Tonna is on 2m. Time will tell. Again, we had to get equipped with rotators so we bought a TV style rotator for 6m and acquired a Hirschman rotator when we bought the 70cms antenna. The Yaesu G450 is permanently attached to the hydraulic tower for the 2m station (normally running an A3S). Coax was also a stumbling block, particularly for 70cms where we only had 50 watts available to us and potentially lots of loss on our standard cut of Westflex, perhaps too lossy for 70cms? A 30m length of Ecoflex 15 was despatched from Diode with matching connectors last week to compensate.

The line-up ended up with FT-2000 on 6m at 100w with a 50m run of Westflex to a 3 element beam at 10m. For 2m, we ran TS-2000 on 100w via 30m of Westflex to the 17 element Tonna at 10m and a pre-amp at the rig end. For 70cms, we ran a further TS-2000 which is factory throttled to 50w through 30m of Ecoflex 15 to our weird X-Quad type antenna at only 9m. Perhaps a small linear for 70cms next year and a pre-amp? A bigger 6m beam will be discussed for next year too.

Logging was exclusively N1MM on Dell Optiplex machines and 15 inch flat-screen monitors without networking enabled due to running separate serial numbers for each band. One Optiplex blew up on Sunday morning after refusing to boot due to condensation we think. We had shut the station at 2:00am for 4 hours to get some sleep and upon waking up and restarting the generator, James discovered an issue of the PSU. Hilarious at the time because when it was plugged in, it sounded like a crunchy plastic pop bottled being scrunched up and I’m shouting at Tim to take the plug out. But like the boy who always cried “wolf”, Tim’s got wise to my practical jokes and really thought I was scrunching up a plastic pop bottle and refused to cooperate. A final “bang” from the PSU convinced him that perhaps this time, I really was telling the truth! Very funny.

Before the off, Tim’s testing proved useful on 6m scoring a number of interesting DX entities, including 7X2RF from Algeria – which enlightened some passers-by who were amazed at what we were doing. I nearly sold two more Foundation tickets!

M0XXT/P

At 15:00hrs local time we started in anger with myself on 70cms, Terry on 2m and Tim on 6m. Having James and Aidan as rotation operators meant that 70cms didn’t become too onerous (50 QSOs in 24 hours..? Ugh!). Massive thanks to Aidan from the team here; he attracted at least 50% of our score on that band, refusing to give up and logging each contact in a determined and professional manner. This was Aidan’s first time on a contest and he’s just 12 years old. May I take this opportunity to thank those stations that recognised Aidan’s youthful voice and his achievement on this band, you stuck with him to ensure a 100% completion for each QSO. Aidan is currently under guidance as part of his foundation license and to be schooled in contesting so early, we think was marvellous. Thanks to all who helped him. Let’s be clear that he had guidance for each QSO and not left to his own devices.

As a “restricted” entry, we couldn’t use brute force to open any doors and it therefore is a slight embarrassment to only have logged 156 QSOs on 2m, 48 QSOs on 70cms and circa 95 QSOs on 6m.
The “magic” band did prove to house some interesting DX from North Africa through to the deep Mediterranean but 2m and 70cms held back offering us no more than 600 km contacts and then very infrequently. Most QSOs were inside the UK although 21 large squares were worked in the end from Ireland through to Germany.

The weather attempted to dampen our spirits but with such strong characters in the tent, we made our own fun and had a ball all the same. At dinner time, we turned the volume down on all three sets and sat down together for our evening meal. I had cooked a top-line Spag-Boll and Terry had us wash it down with a few bottles of bubbly. Fabulous atmosphere.

M0XXT/P

We were amazed at some of bad signal quality issues being produced on mostly 2m and 70cms; warbley modulation and severe splatter in the main. In one case, we had a couple of polite conversations over a period of a few hours regarding a particular club’s 60Khz splatter until they finally believed us and turned down the wick. I realise that Open class stations might adopt the AKR attitude, “All Knobs to the Right” but for the rest of us, even stations 60 miles away can still be 30db over S9 and this can spoil the fun when the signal isn’t as clean as it should be. Please check your equipment before the contest.

No real issues materialised bar some water in the 70cms feedpoint which was fixed by a wild guess. Dropping the mast and pouring it out and resealing it for another day had us back to full power. The PSU which blew up the 70cms Optiplex didn’t hurt too bad but dropped the 2m station for 10 minutes while James and I recovered the data by swapping out hard drives – just as Terry finally scored a small run into Northern France! The new tent, “Battalion HQ”, held up well to the weather, only developing a couple of extremely minor leaks after continual battering rain for 24 hours. With its huge side-pods, it really became a massive area to work in allowing a full kitchen in one area and an operations room in the other with a dining room for 6 people. We’ll roll this out again for SSB Field Day. Trust you’ll be there?

Results:

6m            95 QSOs           45,847 points       Best DX UT3UA – 2251 Km
2m          156 QSOs           27,819 points       Best DX  F4CQY/P – 640 Km
70cms      48 QSOs             5,066 points        Best DX  PA6NL – 411 Km

Operators:

M0MCX (Callum, Supreme Commander 4th Quadrant)
G4MKP (Terry)
M0URX (Tim)
M3YOM (James)
Aidan (Foundation student)

There is some mild debate in the team if we’ll do this one again. I’m told that VHF can be fun with some lifts into the continent but maybe Silverstone, Wimbledon and perhaps the rain damped that down – as did lift conditions I think.

I’m amazed that with all those FT847s and TS2000s sold, few operators perhaps even knew to turn on their radios for an hour and work a few of us /P stations on 6m, 2m and 70cms. However, we did work a few vertically polarised stations quite easily who were giving away single digit points and I thank those stations for coming on since we worked hard for every QSO. It’s really quite easy to score a few QSOs from home with a V2000 style tri-bander vertical. Someone, somewhere should fly the flag for this since hundreds of private stations could have helped make this a bigger event.

Cheers-n-beers,

Callum (M0MCX)

17 Element Tonna Test for 2008 VHF NFD

17 Element TonnaOur 17 element Tonna is up for a test tonight, to ensure that everything will be working for VHF NFD event this weekend. Initial results are proving that its an extremely capable antenna and at 30 feet high, it’s just sitting over the rooftops, giving me a clear run across Warwickshire to the continent.

Fingers crossed for a bit of a lift tonight since it’s the 2m activity contest and James is popping over for some practice. I’ll write up a small report later.

In case you are wondering, yes that’s a Yaesu rotator bearing that I’m guying to at the 9.5 meter mark. It’s not holding the mast up, just taking the horizontal strain off the rotator.

[Later]

41 QSOs in tonight’s contest and 12 square multipliers. Not a big score but jolly good fun and at least we seemed to be ini the top third in terms of score. Longest DX was GM3UCI for 398 Km.

Callum.

Abuse of power by N1KFC

I seemed to have pressed N1KFC’s eject button when I accused him of being a policeman in Yahoo’s Ameritron Amp group. Funny – I’ve never done that before (cough, ahem!). He’s a very diligent co-moderator! Anyway, the silly oaf then put me on moderated postings, censored my posts and finally deleted my previous ones 🙂 How to change the course of history, eh? There’s certainly some strange folk about 🙂

Anyway, after much debate, a few of the die-hards suggested we start a new group which we did – and we’ve called it “ameritron” (strange name for an amp group!).

Please feel free to join us there.

Cheers-n-beers,

Callum.

Narrowboat Antenna

IMG_8483Never one to do things by half, I have finally completed the HF installation on my narrowboat. First impressions are excellent, I believe it’s working very well. I now need a solid state 500 watt linear amplifier to make use of the 800w PEP atu at the feedpoint. Can’t wait.

WiFi and Cellphone antennas still not connected. My solution here will probably be a Dlink Router with PCMCIA card running an HSDPA service from Vodafone. The PCMCIA card will take it’s signal from the Cellphone antenna and the Dlink Router will then distribute WiFi throughout the boat via the WiFi antenna on the roof. I have personally cracked WEP and WPA access points so I wonder if there’s any point in securing them? Of course 🙂

[Edit, July 2008: All antennas connected and working :]

73

Callum.

Tower Update

DSC_3207Last night, we finally fitted the rotator housing and G450 Yaesu Rotator to the tower and tested it out with a small VHF ZL Special which we’ll use for VHF NFD in July (being at 1,000 feet means that we might be able to get away without high-gain antenna arrays, time will tell).

Barry (M0DGQ) is working on designs for a hinged rotator cage which means we will be able to use a 20 foot aluminium pole at ground level. Maybe next year..?

Anyway, we can now claim the record for putting up a 35 foot antenna: 20 seconds with a hydraulic switch 🙂

Callum

My new vertical(!)

CB AntennaWith a feeling of “if you build it, they will come”, I installed a CB style antenna for the 10m band yesterday evening. I needed to shorten it about half a meter for it to work but I noticed that at 12 feet above the ground, it tunes with a low SWR on both 12m and 10m, although it’s not so good around the 27MHz slot- so it’s not exactly broadband. I was also surprised on the 15m band as it presented less than 2:1 in my shack. Red-herring.. it may present a low SWR, however it’s just a crap aerial on that band. The hobby of designing low SWR antennas goes out the window with the dummy loads.

Anyway, why the hell am I writing this? It’s this; I want to know how to feed a half-wave vertical. Why don’t I need radials? I have a 10m fishing pole and I’ll make one for the 20m band and work it all out myself. I know there’s a coil somewhere..

Oh! .. and in the making of this article, I captured a picture of a fly whilst taking a picture of an antenna. See it here: https://www.m0mcx.co.uk/gallery/picture.php?/692/category/67 

Where’s that Glenlivet?

Ameritron AL811x 800w tuning tips

Ameritron AL-811xDon’t spend your life tuning amps. Do it once with sticky labels and forget!

I’ve recently un-mothballed my Ameritron which has seen good service and delivers 200 watts for 10w drive – ideal for PSK31 and other low-power digital modes. This amp will go further and deliver 400 watts for 30 minutes key-down so it’s ideal for full legal power in the UK.

Anyway, flicking from 80, 40, 30 and 20m during the grey line with the AL811, I’ve discovered that I have never mastered the speedy band switching that some operators appear to have worked out. So I developed my visual system(!) using sticky labels tuned against a 50 ohm dummy load to calculate the fastest (approximate) setting for each band. It works blooming marvelous too!

Since a picture tells a thousand words, I won’t bore you any more. Here’s a close up! https://www.m0mcx.co.uk/pictures/Ameritron_AL-811X.JPG

[Later] – I can’t get 10m to tune. Maybe it’s not an export model? In which case, according to sources on the internet, to convert a non-export model to an export model, one needs to make a mod by cutting a wire. This will enable 12 & 10 meters on the Aux switch. I hate engineering! 🙂

Cheers, Callum.

 

Ham Radio Realtime Gray Line

Current Gray-Line Position

Courtesy of http://www.fourmilab.ch/, this is the current real-time position of the Gray

Line, as utilised by Ham Radio operators over the world.

For those who don’t know, the”grey line” is a band around the Earth that separates daylight from darkness as the earth rotates.  Propagation along this line can be very efficient.  One reason for this is that the D layer, which absorbs HF signals, disappears rapidly on the sunset side of the grey line, and it has not yet built upon the sunrise side.

Interesting? Well, I’ve spoken to people on the other side of the planet during this 30 minute phenomenon. It certainly gives you a buzz.

[Later: This damned map can takes ages to load.. Grrr]

Cheers.

Proposed Field Day Location

VHF NFD Location

I’m very excited that we appear to have found a new Field Day location in the Cotswold Hills, particularly useful for VHF NFD since it is only a whisker short of 1,000 feet. Of course, this will be spectacular for SSB Field Day as well since we might even make use of the height to secure a few more 10m SSB contacts around the UK and into the continent if we’re lucky.

Tim, James, Terry and I visited the site today to ensure that it is suitable – and at only 40 miles from Solihull it’s not as if we’re stretching the fuel tanks to get there either.

I’ve never operated seriously at such a height so I will be fascinated to know how our performance compares with other years when we used to operate at a local club that sported 450 feet ASL plus a 100 foot mast. I have a feeling the extra 500 feet might prove to be exceptionally useful!

May I thank Tim who drove around one evening for hours with a friend of his, door knocking land owners that happened to live very high up. This land owner shall remain anonymous for the time being. Thank you Sir for assisting our group.

VHF Field Day 2008 M0XXT

VHF Field Day 2008 M0XXT

We’re looking for 1st-class contest operators which a good sense of humour who want a couple of interesting weekends away with our club call; M0XXT. If you are interested in joining our group, please email me your phone number.

Callum, M0MCX.

Construction of the 80m Vertical

I’ve had a few emails requesting a deeper understanding of the 80m vertical we put up in January. Andy (M0CTR) kindly emailed me today and I have published my email so that others might benefit.

Andy, The 80m vertical was an interesting project. Firstly, let me explain that the 80m vertical was a carbon copy of a 40m vertical I made a few months before. I multiplied most of the dimensions by a factor of 2 – bar the vertical radiator. I needed to make a coil for the middle. Have you seen this: https://www.m0mcx.co.uk/?p=68 – and read the PDF article. It was this that gave us the inspiration for the 80m version.

To business: The whole thing has an elevated radial system – this is very important because a grounded system would need loads more radials and the match would not be near the 50 ohms we achieved. Building a quarter wave though is relatively easy if you just build everything in quarter wavelength dimensions – hence the 20m long radials. Theory suggests that you only need 2 x elevated radials for an elevated vertical, however practice is demonstrating that you do get a slightly better radiation pattern for 4 x radials since nothing is actually accurately cut (even if you think it is). Don’t despair though – we have built this with 2 radials and it’s very compact like this. A wire cross 40m x 40m is a huge beast.

The height: We used a 6m scaffold pole to raise my 12m spiderbeam pole up. The photos don’t do it justice.. It’s quite high! You need the height though to make it all work. Don’t get me wrong.. It will work at say 12 feet above ground, but the higher the better. Theory tells you to build the radials at a 30 degree angle from the horizontal, but you would need to go higher again. However, it all becomes big – even the weight of the wire starts to make stuff sag – and the coax gets tangled, you trip over guy wires, etc, etc.

Dipole CentreAssuming you have built everything so far to this large scale, you only need to worry about the vertical radiator and then this is just a matter of making a coil. I forget the actual dimensions, I think it ended up at 33 turns on a 2 inch former, using 2.5mm ring mains insulated copper wire (we used the Red portion!) and we put the coil right in the middle of the vertical. It’s an easy matter of raising it, measuring SWR then lowering it again to make adjustments to the coil to finally get a match. I seem to remember that one turn was worth about 40kHz (this moved the SWR from 3.700 to 3.740) but I don’t remember exactly.

I guess you must have seen this: https://www.m0mcx.co.uk/?p=100 – well you will also note in the photos that we started life with about a meter of spare wire sticking out the top of the SpiderBeam pole. We didn’t need this, we had to chop it off and reduce the turns to get the frequency up to about 3.700. I recall that in the end, we agreed to remove another turn but by then, we just wanted to operate!

The feed point was a dipole centre from Lynch / Westlake or somewhere, however a home-brew one would have done just as well. Ensure that everything is watertight and that the centre conductor does end up feeding the vertical – not the radials! You may laugh, but I really did make some contacts on 20m on a narrowboat once by feeding the hull instead of the vertical (yes, the vertical became the ground for the boat antenna!) see here: https://www.m0mcx.co.uk/gallery/picture.php?/501/category/44.

So that’s it really. Use any wire for this. It won’t matter at all. The coil needs to be insulated wire because otherwise it will short out and become a straight vertical. Oh! And you might like to put half a dozen ferrite cores on the coax near the feedpoint as a kind of RF choke so that your RF doesn’t come back down the braid and cause you RF feedback. We never did though.

Results? In the end, I personally concluded that the only band I don’t like verticals for is the 80m band(!). I have compared this antenna with high dipoles (60 feet) with both USA, ZL and VK switching between this vertical and the dipole – none of them gave me a better sig report on either antenna. “No difference” was the reply. However, a 60 foot high dipole is a pretty big monster in its own right unless you have some serious kit. We are endlessly operating of the fringe of physics – yes we have snapped a 12m Moonraker mast last year pushing the limits!

Tip: Next time we’re going to try an inverted L without the coil. Modelling suggests better inter-G and almost as good far field plots at lower angles for DX. Watch this space (as they say!)

Good luck,

Callum.

Shakespeare Marine HF SSB 5300 Fails Again!

Shakespeare’s top-of-the-range HF antenna continues to defeat me. In response to my original failure, they sent me another one which they told me had been tested at their UK headquarters for structural integrity. It arrived promptly enough and I left it in the box for a few weeks until I got it out last Sunday for a quick test.

I discovered that the stainless ring that feeds three buried verticals inside the glass fibre (which I assume is to increase bandwidth) had come away from the main pole and splintered the top coat of resin. Clearly unnaceptable. Freezing water for a start would make mince-meat of this. I took some pictures and sent them off for comment.

It turns out that the US factory think that this is normal and quite safe. Let me get this right, a $600 antenna that is supposedly designed to save your life in the event of you needing to get help as a last resort via HF first breaks in half on a sunny lawn(!) then its spare develops a major crack sequence just where the feeder enters the mast(!) on the replacement.

Now I don’t want to be alarmist but the last time I put the following words: “shakespeare marine 5300” into my favorite search box, this page came first. A great advert if you want to buy a Shakespeare Marine HF Antenna (another search term which this site enjoys first place at google). I’m starting to get bloody pissed off since the boat show is in 6 weeks time.

Have no fear though! I have found a different supplier that apparently takes quality a lot more seriously than Shakespeare Marine. Courtesy of my mate Stewart (F/GM0GTU/MM), who is currently sunbathing on a large boat off the coast of Angola, he has introduced me to Conmod and their fabulous range of professional range of HF antennas:

They even do a hinged version which would be great! If you have very large pockets, they even do a motorised elevation hinge! Woah. Stewart is currently using their AT82M (8 meter vertical) and has worked 76 DXCC entities in three weeks.

Anyway, Shakespeare, if you can’t get your finger out and ship me a perfect 5300, I’ll be hogging the limelight for Shakespeare Marine search terms for many, many moons to come. Get your arse in gear and ship me a spanking new 5300 please.

<later> I’m pleased to report that the 2008 model is spankingly fabulous. They shipped me one directly from the US to replace all this mess I had and I love it. It’s very white and nice and shiny and smooth. It also polishes up well which got all the winter dirt off a few weeks ago. Thanks Shakespeare.

IMG_8483

Cheers,

Callum.

New Yahoo group: uk.amateur.radio

Competing directly with the jumped up bunnys who post anonymously on uk.amateur.radio, I honestly and openly welcome you (and hereby invite you!) to join the Yahoo Group uk_amateur_radio, regardless of any brushes with the law you may have had or anyone else in the UK hobby (or with me for that matter!).

Subscribe to uk.amateur.radio

I really like the idea of uk.amateur.radio but the anonymous postings concern me. At least an open warranted forum will encourage genuine debate.

We’re looking for at least three independant moderators who can approve / deny access to the list. Just drop me a line if you would do this job.

Here’s the direct link: http://groups.yahoo.com/group/uk_amateur_radio/join

Thanks.

Callum, M0MCX

Floating Shack Update

Wherethehell-RweWherethehell-Rwe, our new 70 foot, 22 ton narrowboat was launched last week whilst we were in Disneyland. For once I’m actually speachless!

The fit out starts in earnest since it’s the factory’s show boat at the Inland Waterways 2008 show, end of May. This means that Mike and the boys need to get some overtime in and finish inside seven weeks. Record breaking stuff.

I’m fitting a TS2000 up front with an RC-2000 remote head at the steering position with an 800w PEP feedpoint ATU connected to a Shakespeare Marine 5300 SSB antenna on a Barenco hinge. This means when we are stationary, I can raise it up easily and play HF. I’ve also specified a quad-band mini vertical for 10, 6, 2 and 70cms near the stern that I can lift-n-tilt when needed (bridges and trees) as we’re driving along. I’ll truly be a mobile station.

The only thing I haven’t managed to shoe-horn in is SGC’s 500w amplifier. We just can’t seem to find the room to fit it and supply the air-flow along with up to 100 amps of 12V DC. We’re putting the cables in though in case I can find a place up fron in the future.. a 60 foot run at 100 amps..? Woah.

Anyway, we’re dead excited and look forward to working many of our friends whilst “mobile”. Watch this space!

More photos: https://www.m0mcx.co.uk/gallery/index.php?/category/62

73

Callum.

GB1DSG hosts Thinking Day On The Air 2008 (TDOTA)

We put up a single feed fan dipole for 40m and 80m at 65 feet which certainly hammered out a signal creating quite a pile up in the UK, particularly Sunday afternoon on 80m. We had no shortage of stations to talk to, so thanks all who hung in there waiting for an opportunity.The evening before, James and I held court through the night picking up ZL, VK, S and N America which is excellent and James’s first copy to VK on 40 meter band – this was very thrilling. Being a Scout Station – and being spotted continuously meant that we were creating quite a stir across the globe.

 

petroleum-jellyThe day itself was excellent; we had a different Brownie pack through the door every half-hour. Each pack would have a fun chat outside by me before watching the “Hello” film from the ARRL. It’s very American but I can’t find anything short and to the point that can replace this wonderful little blast of interest for children. RSGB, if you have something – please let me know since I would love to show something a little more English.

After the film, they went to Chris and did a kind of “appreciation of morse code” where they could all send their names too. Morse bracelets were new this year – so thanks to the individual who thought this up, I can’t remember who you were now – a Pink bead for a DIT, a purple bead for a DAH and a white bead for a SPACE. They thoroughly enjoyed this activity. If only I could get Cubs to sit quietly and do these little crafts!

Finally they prepared their greetings message and Tim just maintained a pile up the whole afternoon so that when we had some girls ready, he would chose a strong station to get a greetings message through. If there was time, we had our own QSL design factory to top it all off!

That afternoon, we talked to many stations – many had been Guides or Scouts and some even claimed that their first ever radio experience themselves was doing JOTA and TDOTA – so it was wonderful not only to hear those stories but also to let the girls climb over their nerves to deliver a simple message on the radio. It didn’t help when I explained that only the WHOLE world was listening! I’m a rotter 🙂

Although we were gratefully thanked by the Guide District, I must say that it’s a pleasure to share our hobby with young people. We’re slowly building some budding M3s and I’m really proud of our achievements at Dorridge Scouts. If you are one of us and you are reading this, then be proud of what we do – and make sure that your local community understands that being a Radio Amateur is not a thing of the past, it’s bang up-to-date and happening now, on your door-step.

73 DE M0MCX

Kenwood TS-2000 Remote Mobile Controller RC-2000 Review

RC-2000If you’ve been keeping up to date then you’ll know that I have chosen the TS-2000 as the primary radio on board our new narrowboat, “Wherethehell-Rwe”. At the helm (which is a dead give-away for my yachting heritage) I have specified the RC-2000 which should be rather fun to muck about with as I swan along at 3mph across the countryside. In English then, the TS-2000 will sit at the front of the boat near the bow and 60 feet away at the stern (the back.. or in narrowboat terminology, the steering position), I’ll be running an RC-2000 remote controlled head, remote microphone and remote loud speaker. Clearly I’ll also need a switching system up near the front so that I can also use my toys in the evening in the comfort of the boat.

Isn’t this a bit over-the-top, I hear you ask? Oh yes. For those visitors to the site who haven’t seen a narrowboat, they are the long, thin steel boats that sail the inland waterways and canals of the British Isles (they used to be made of wood). The canal system was started literally hundreds of years ago and squeezes through the cities of England, Scotland, Wales and Ireland. Clearly running a bloody great big HF antenna is completely impractical, which is exactly why I’ll hinge my Shakespeare Marine HF SSB vertical over to rest when we’re motoring. However I have purchased a small 4-band 10/6/2/70 antenna that will allow me to play CB, 10m, 6, 2, 70 and PMR446 from my steering position. This antenna pulls-n-lays so that we can crouch under trees and bridges as required. Of interest, modelling my Shakespeare 5300 HF antenna whilst it’s actually lying flat to the deck, does demonstrate a small RF bubble of around -15dbi for the low bands. This will mean I can make some contacts on 40m and 80m as I travel along. Thank goodness for a high-power CG5000 ATU that has just arrived that will couple the HF antenna to my radio for an all-band experience (http://www.hamradio.co.uk/acatalog/Am_TunUnits_MyDEL.html)

RC-2000

I had seen pictures of the RC-2000 on the internet and I always thought it was about the size of three cigarette packets. I was about 40-50% too big. It’s more like one and a half packets sitting end-to-end (maybe a whisker more but I’ve stopped smoking so I can’t judge too accurately!). It’s smaller than you imagine because you don’t often see marketing literature or google images with the RC-2000 in situ with another item like a microphone or something.

What’s in the box? You get the head itself and a pretty external speaker that matches the size of the RC-2000. The speaker is very well made and the sound is good, peaking strongly in the 300-3000Hz band for clear voice comms. Three main cables come with the box, a large microphone extender that has a CAT5 joiner near one end connecting a female and a male 8 pin mic extension together. I don’t know why they’ve done this? Maybe so you can squeeze the CAT5 plug through little holes in your vehicle? Frankly I’ll be cutting this part off and replacing with something properly grounded. You also get an external speaker lead and a 4 way control lead. It says in the manual that one end is a 4 pin RJ45 style socket and one end is a 6 pin, in fact this is slightly misleading. The 6 pin doesn’t have 6 pins – it has 4. However the confusion reigns because it’s the size of a regular 6 pin version but the two outside slide connections / pins are removed completely. The pin-to-pin layout essentially transfers all pins on the 4 pin plug to pins 2, 3, 4 and 5 of the “6 pin plug”. If you have come here from a google search, I trust you can work this out! You also get a bag of screws, three clip-on ferrites and a large beefy TS-2000 Mobile bracket. Lastly, don’t forget a neat mounting bracket for the RC-2000 and the remote speaker.

RC-2000

The initial fears of the size issue soon disappear when you plug everything in and switch it on. Menu 00 (Brightness) and menu 59 (Contrast) work here for both the head and the TS-2000 at the same time, so you may have to enter a compromise situation, particularly on the brightness – however you can program different “users” and each user can have a different requirement so whilst using the main unit, you can select user 1 and when using the remote, you can select user 2 (for instance). I was initially extremely disappointed to start with because I couldn’t fathom out how to increase the contrast until I hit upon the idea of menu 59. Working these two menus mean that you can get a really clear and cute display on the go.

Using the RC-2000 itself is very intuitive with lots of neat stuff tucked away. I won’t give you a complete run-down because that would be extremely tedious however be assured that I was up and running in seconds. Apart from the soft switches down each side and across the bottom, you are left with three control knobs; the main VFO which doubles up as a finer VFO by pressing once, then the twin squelch and volume controls which mirror exactly what the main TS-2000 does.

The soft switches work well. Bottom left is initially called A-1. Pressing it repeatedly changes the functions of the bottom buttons via deeper menus, A-2, A-3, and A-4. Holding it down for about a second gives you the B series of menus as described and finally holding it down again gives you the C series of menus. Inside all these, you are mirroring the functions on the TS-2000 in various ways.

Essentially, everything that you can do with the TS-2000, you can do with the RC-2000. I’ve had mine sitting beside me for 24 hours now, forcing myself to use it for everything from changing power settings through to recalling memories. It works well – and just for fun, I called QRP into Russia on 10w and scored a hit. Why QRP? I just thought it might be an idea. Don’t worry, I’ve gone off the idea already!

RC-2000

My only concern is the main remote head VFO and this worries me for two reasons. Firstly, in terms of pure usability: You can tune in 1KHz steps, so let’s take the 40m band.. One clockwise mini-click on the remote VFO takes you from 7.050 to 7.051 (there’s about 30 clicks per rotation). However, you can hear a station in between these two frequencies, so you need to tune to say 7.050.50. To do this, you need to hit the VFO like a switch and a small “TUN” legend comes up on the display. You then rotate and mini-click your way from 7.050.00 up the required frequency in steps of 10Hz, so that to get from 7.050.00 to 7.050.50. You’ll need to rotate the knob around about one and a half rotations (50 clicks) to get to 7.050.50.

However, the UP/DOWN keys on the microphone is a heck of a lot faster so if you’ll be running the stock mic, you can NET someone in perhaps better by using that.

The second concern is the quality of the remote VFO knob. It feels a bit cheap, perhaps fiddly but I’m spoiled with a number of FT1000 variants in the shack here and of course the TS2000. To be fair, there’s an element of chalk and cheese here – after all this is a remote head is extremely economical, attractive and functional – and fairly unique in the amateur radio market, it’s not a snap-off, it’s an additional piece of equipment that will either extend your shack in your home to perhaps a different room or to another wall in your shack. Of course, most will buy it for mobile work, and what a beast that would be? You only need to add SGC’s 500 watt amplifier and a CG5000 800 watt PEP auto coupler and you’ll be mobile QRO all-band for under £5k! Oh! You’ll need an 8 foot stainless whip 🙂

Marks out of 10? Well I was expecting to give this an 8. I really was. I thought it would be too big – and a display that needed some “imagination” to make the best out of it. However now that I’ve had it on test for 24 hours, I can honestly say that it’s now giving it a 9, only losing points on the VFO issue that I’ll probably get over in time anyway.

Go on, treat yourself – they’re great fun.

Callum.

Station Ground

Station GroundFive years after becoming licensed, I’ve finally got around to putting a formal station earth / ground in situ comprising 2 x four foot copper rods and a liberal amount of copper wire into the ground on the front lawn. Instead of cutting the last 8 foot off, I used a lawn edger and shoved the copper about 4 inches into the lawn until there was two foot left. Looking around wondering what to do with this, I spotted my massive hammer drill with 24 inch 20mm drill bit. Clearly, it was asking me to drill a hole into the lawn and shove the remainer into it! I did. So I now have 2 x four foot and 1 x 24 inch ground. No idea if this remainder will do any use at all. You never know.

They say one has to reduce the run of copper cable connecting the station to the ground as short as possible – and in this case, I’m running at about 8 feet prior to the first copper rod.

The bad news is that I managed to crack one of the 3 x 2 slabs outside the front door. Wendy is delighted because it means, to use the US expressions, we’ll have to re-model the front! Grrr.

Technically, I have no idea why this new ground will make a difference however my good friend Terry (G4MKP) put a load of copper in the ground a couple of years ago, connected everything to it and all his interference went away. Finger crossed, I might experience the same. I’ll connect up tonight and let you know.

Station Ground

[Later] Terry says that instead of connecting the earth to each grounding post, I should probably connect the earth to just one of the lugs. The thinking it’s unliikely for a single ground to induce a ground loop and in the case of a station “funny” it’s easy to disconnect the earth for problem solving.

The other thing he pointed out is that my bus-bar should be ideally gold 🙂

Yaesu FT-8800 TX mod for PMR446

I needed to mod my Yaesu FT-8800 recently. Be aware that the FT-8800 does not have have 6.25 kHz channel selection, the true PMR446 frequencies START the sequence at 446.062.50, which is channel 1 as in this table:

PMR 446 Channel Frequencies

  1. 446.00625 MHz
  2. 446.01875 MHz
  3. 446.03125 MHz
  4. 446.04375 MHz
  5. 446.05625 MHz
  6. 446.06875 MHz
  7. 446.08125 MHz
  8. 446.09375 MHz

So to listen for channel 1, you need to dial to the nearest you can get to, which would be 446.005.00. Channel 2 will be 446.020.00 etc. Obviously, set your rig to 5kHz channel selection (Menu #38).

FT8800 TX/RX modIdeally, you need 12.5 kHz channel selection starting from 446.006.25 which all Kenwood’s do (eg TS-2000 and Kenwood handies) however I don’t believe there’s a way to do this with FM only Yaesu Ham rigs.

Anyway, you want to mod yours? Here we go: Remove the screws on the top of the unit and lift it off, careful not to pull the loud speaker wires off.

Find the bottom right Resistor/Diode I took this picture, because I couldn’t find one on the net that was the detailed enough for my poor eyes! Remove the component on the bottom left, as shown in the red circle. Unsoldering this is lots more difficult than you can imagine when your eyes are having an off-day. In fact, I got it off by scratching the soldering iron around tying to find the blasted thing. All of a sudden it was gone. You can tell I’m no hardware engineer! I have no idea where it went – it just dissapeared. Could it have melted? Dunno.

Anyway, re-assemble the radio and power it up. It goes through a factory reset power-up procedure and away you go with a brand new radio. Well, it worked for me!

Tips from others: Use a low wattage soldering iron and a ground strap. I didn’t do either!

73

Callum.

How to build a proper Skyloop (Delta loop construction)

Well folks, I’ve been continuing my experiments with my two sky loops (closed loops of wire held above the ground at three or more points) and comparing them against various verticals. Sometimes the verticals win, other times the loops do. I’ve had 8m verticals and longer too. Today, I’ve put the 12m vertical back up (https://www.m0mcx.co.uk/?p=102) fed with my trusty SG230 coupler. I may add that anyone interested in fast antenna experiments should get one of these. A tremendous piece of kit. Matches anything.

SkyloopApart from the noise factor (loops are quiet), the vertical seems to make a better impact on transmit more often than not for DX, unless I’m into NVIS or near NVIS (500 miles or so). Even then, up to 1,500 miles, the jury is out – either antenna can win. Beyond 1,500 miles the vertical seems to do a better job most of the time – not always, however my loops are very low to the ground, maximum height of 7 meters. On 40m, I would say the vertical is a better antenna to have almost all of the time unless you need NVIS for local copying – and with the sun spot cycle as it is, you won’t get this for a while yet!

I used to have the opinion that loops were more often than not, cloud warmers. However let’s face it, so are almost all low-to-the-ground HF antennas. My interest was tickled recently when VE7HA mailed me an MMANA file of a very high (80- foot) 300 foot circumference skyloop that he had built with three very large trees. He claimed great contest results with this loop. I had a look at the plots. Yes, he was right.. Check this out, 10.4 dbi gain at 5 degrees to the horizon on 10m? On 15m band, we’re looking at 12.5 dbi at 7 degrees to horizon! On 20, it’s as good with 10.5 dbi gain at less than 10 degrees.

Skyloop Far Field PlotNow.. This is a very different animal to the Skyloops that most people build. If you want a pile-up generator, this is the animal to have. It fundamentally, takes all your RF energy and pancakes it low to the ground in various star shapes. Very Of course, you will sometimes null out the station you want but you could get really clever and change feedpoints with relays. But ignoring the clever engineering, this has changed my mind as to the effectiveness of a high skyloop.

Be prepared to get into some matching territory though, ideally an automatic coupler at the fedpoint with open wire feeder, or perhaps an olde-fashioned tuner in the shack!

Some day I will build one, I just don’t have the trees 🙁

(Years later: I did build one. They’re amazing).

73

Callum.

Antenna -v- High Wind

Movie IconWas I QSB this afternoon on PSK31? Probably!

(Can’t get video to play? Right-click and save it to disk first! Don’t ask 🙂

In the main, we’ve all heard that wind normally beats antennas when it comes to staying up. In case you haven’t ever seen a cheap fishing rod blank in high winds, have a look at this. I call it a 10m vertical, in fact this one is only 8m. The matching is done at the feedpoint with an SG230 and 9 raised radials. It’s a temporary antenna. I’m just testing it out for fun. The 12m beats this by a fair margin on the 40m band.Anyway, enjoy the little film!

By the way, don’t be fooled by the helically wound look. It is hardly that. Here’s a real helically wound vertical from a couple of years ago – and this one does tune on the 40m band without help from an SG230. It is directly fed with coax:

73

Callum.