AmateurRadio.com

The price of copper has risen by 300 percent over the last two years. Other metals have also risen in value. According to GB2RS News, this is making radio amateurs targets for copper thieves. An amateur in Yorkshire had all his cabling stolen including the coax and ladder line for his G5RV antenna.

I presume the action of an irate neighbour fed up with receiving TVI has been ruled out. The RSGB is encouraging amateurs to make sure access to cables is restricted and that their installations are as secure as possible. Looks like another benefit of stealth operation and attic antennas!

The weather forecast wasn’t promising, even though the morning was fine. But I was keen to get out on the fells. Yesterday I spent a couple of hours making an antenna specifically for Wainwrights On The Air operating and I wanted to try it out. So I headed for Broom Fell, LDW-169.

I’d had the idea for this antenna for a couple of years but hadn’t got around to making it. I was going to call it the WOTA Pole. As, for reasons I will come to, I’m unlikely to be publishing a detailed description of it, I’ll give you the outline of it now. It’s a Slim Jim made from 300 ohm flat ribbon cable, housed in a tube made of white UPVC electrical conduit. The tube breaks down into four sections for easy carrying using UPVC jointing pieces. It’s a similar idea to the SOTA Beams MFD except that is a half wave dipole and has a T piece with a coaxial balun and can be used vertically or horizontally. The Slim Jim should theoretically have some gain over the dipole but it can’t be used horizontally, which is no disadvantage as 99% of WOTA activating is done on FM.

One reason I haven’t used the MFD very much is the difficulty in deploying it. The antenna is provided with two velcro straps so it can be attached to a convenient fence post. Unfortunately our hilltops don’t often have convenient fence posts on the summit. My intention with the WOTA Pole had been to stuff the antenna in my rucksack for support so the radiating element would be above head height. Unfortunately UPVC jointing pieces aren’t very strong and it’s impossible to lift a rucksack onto your back whilst keeping a 2 metre long antenna perfectly vertical to minimize the strain on the joins. As I lifted it up I heard a crack and the antenna fell to pieces!

I didn’t see any damage. It was quite windy up there and I thought the culprit was the wind, plus perhaps I hadn’t pushed the jointing pieces tightly enough together. So instead I decided to strap the antenna to a convenient fence post which fortunately Broom Fell just happened to be equipped with right by the summit cairn. You can see the result in the photo. Lords Seat is the fell on the right in middle distance, with the Skiddaw range further away on the left.

Sunday lunchtime is not the best time to go WOTA activating. I think many chasers are busy filling themselves with roast beef and yorkshire pudding and nowhere near their radios. However Colin 2E0XSD was on frequency having been following my progress via APRS. He gave me a 59 plus report on the new antenna. After a couple of fruitless CQs I started to think that was going to be the lot, then Geoff GM4WHA came up, followed by Malcolm M0XAT. Then no-one. As the wind was bending the WOTA Pole rather a lot I took it down. I then tried a couple more calls using a helical antenna and got Mark MM1MPB and Tony G1OAE. Finally Colin 2E0XSD came up again to say I was only 4 by 3 on the helical antenna. The WOTA Pole had made a huge difference. It’s just a pity there hadn’t been anyone further afield listening at the time.

I walked down the hill a short way to get out of the wind and have the sandwiches and coffee that Olga had made for me. While I was down there I thought I would have another try at hoisting the antenna on to my back in the rucksack. Then I noticed that one of the UPVC jointing pieces – the one at the top of the lowest tube that takes most of the strain – had cracked. When I tried to get it aloft a piece broke away completely and the antenna fell to the ground. Another idea bites the dust. Literally!

On the way down I was pondering what I could do to make this idea work. Clearly the Slim Jim itself performed very well. In fact if anything it worked a bit too well on receive. The VX-8GR receiver exhibited clear signs of overload. I’d noticed this before when I’d used that radio with the MFD. I should really use the Motorola GP-300. Ironic that a radio that cost me £1 at a rally works better than a fancy Yaesu costing more than £300!

The problem with my WOTA Pole idea is the mechanical design. If I’d made the tube two one metre pieces instead of four 50cm lengths it would be stronger. But having something sticking 50cm above the top of my rucksack would be a nuisance when walking under low branches or ducking under fallen trees as I actually had to do on this walk.

Perhaps I should give up the idea entirely and try to make a rucksack mount for BNC fitting antennas. Then I could use the telescopic 5/8 wave that I usually use on less windy days fitted directly to the radio. What do you think?

A few readers of this blog may have been surprised to contact me on a new mode last night…RTTY.  I’ve tried radioteletype once before in the past (also in the NAQP contest) but rather unsuccessfully the first time.  The second outing was a bit better.  I suppose with practice it becomes fun, but the primary motivation here is ARRL’s Triple Play award for contacting all 50 states each three times, using CW, SSB, and digital.  CW was, of course, easy.  And, I’m making good progress on the SSB totals.  So, I figured I would stop putting RTTY off and give it a shot.

As you are probably well familiar, I normally contest with two TS-930s.  Their prior owners (who were CW contest/DX types like myself) made various “improvements” to them, most of which I appreciate, but I have no idea how they affect FSK. One radio simply does not work on FSK (need to look into this) and the other has the passband shifted about 50-100 Hz off-center of the normal RTTY frequencies. So, when I was running AFC in MMTTY, it would “walk” to the point that having a lock on the other station would put me at the edge of their passband. I had a terrible time making QSOs for the first hour until K0TI told me I was off-frequency (thanks, Dan!!!) and then I started paying attention to all of the numbers in MMTTY and turned off the AFC, which had some deleterious effects that I overcame thanks to the occasional repeat. Typical analog op becomes digital lid op.

I sent the MacBook (our “home” computer) with Sarah to a conference yesterday.  Since that’s the only place I have LoTW’s Trusted QSL installed and I failed to export a .p12 file, I’ll have to hold tight for a couple of days until they return.  (This is not entirely true, I have an old .p12 file, but I haven’t backed it up again since I renewed the certificate a few weeks ago.  Bad backup practices…although I just got a new external drive so the old drive can be used to do a Time Machine back up…finally.  Another day, another project.)

This post mostly mirrors my 3830 post, but here are the numbers for the curious.  My grepping missed one QSO on 80 meters when I did the totals (N1MM rounded the frequency up to 3600 kHz) for 3830.  So, these numbers are right, aside from log-checking discounts:

Call: K8GU
Operator(s): K8GU
Station: K8GU

Class: Single Op LP
QTH: MD
Operating Time (hrs): ~3

Summary:
 Band  QSOs  Mults
-------------------
   80:   37    21
   40:   58    27
   20:   35    18
   15:
   10:
-------------------
Total:  130    66  Total Score = 8,580

Club: Potomac Valley Radio Club

Team: PVRC #1

Series Four Episode Five of the ICQ Amateur / Ham Radio Podcast. News Stories include:

• NZ proposes changes to 27 MHz band 
• Ham Radio promoted on TV in New Zealand 
• New country added to CEPT reciprocal agreement
• New SA amateur radio regulations 
• 1st Portuguese DStar reflector 
• RSGB looking for EMC volunteer 
• RSGB AGM to be held in Derby 
• Revalidating UK Amateur Radio Licence 
• Radio-active solar flare 
• UK Six Metre Group launch newsletter
• Data across the Atlantic on 502kHz  

Your feedback, upcoming events, Ed Durrant's (VK2ARE) VK report and Martin (M1MRB) features portable power.

Series Four Episode Five of the ICQ Amateur / Ham Radio Podcast. News Stories include:

• NZ proposes changes to 27 MHz band 
• Ham Radio promoted on TV in New Zealand 
• New country added to CEPT reciprocal agreement
• New SA amateur radio regulations 
• 1st Portuguese DStar reflector 
• RSGB looking for EMC volunteer 
• RSGB AGM to be held in Derby 
• Revalidating UK Amateur Radio Licence 
• Radio-active solar flare 
• UK Six Metre Group launch newsletter
• Data across the Atlantic on 502kHz  

Your feedback, upcoming events, Ed Durrant's (VK2ARE) VK report and Martin (M1MRB) features portable power.

New Zealand flag (from Wikimedia Commons)

Tonight, before heading home I dropped by the VA3CUA station at the University where I work.  I used the Icom ID-1 to link the 1.2GHz module of VA3ODG to reflector REF003C, an Australian reflector.  Linked also to the reflector was the repeater ZL1VHD in Auckland, New Zealand. After making a call out on the reflector I had a reply from Marlene, ZL1MYL. We had a nice but brief chat and she told me that there had been messages passed through the Auckland D-STAR repeater for people in the earthquake damaged city of  Christchurch. Messages received were being relayed on via other modes on VHF to Christchurch, as that city does not have a D-STAR repeater.  The chat with Marlene was short as she had to take a phone call, but I did then talk to her husband Laurence, ZL1ICU.

Later tonight I saw the message from the ARRL that confirms that 2m is being used to support the recovery efforts and currently not HF.

If you have traffic for someone in Christchurch then one possible route in is via the Auckland D-STAR repeater ZL1VHD.

I love handheld radios. The “holy grail” for me is to make long distance contacts using a handheld radio with attached antenna. Ten metres is probably the best band to achieve this. Six metres might give stronger signals when conditions are right but it is open too rarely. Lower frequencies are open more often but a practical hand-held antenna is too short and inefficient for voice contacts using low power to be possible. You can put up a ground mounted vertical or hang a dipole in the trees but then it isn’t portable.

Last year I got an Intek H-520 which I used on 10m FM but although I did make some nice contacts with it I was disappointed with the radio itself. It was very power-hungry for 6 NiMH AA cells to the extent that the radio would shut down when used on maximum power unless the batteries had just been charged up. There is another problem with 10m FM in general which is that there are not all that many channels. There is a lot of QRM when the band is open, you are competing with people running a lot more than 4W to a whip antenna and in the FM mode “capture effect” means the strongest signal wipes out all others. So when I saw that a multimode handheld including SSB and covering both the 10m and 12m amateur bands was available, I decided that this was the toy for the forthcoming summer months. SSB offers the chance for some exciting handheld contacts.

The Albrecht AE2990AFS is a multimode multi-standard CB handheld radio that is readily configurable for amateur band use. There are instructions on the web and even a YouTube video on how to do the modification but the supplier included a printed copy in the box. Briefly, you pull out the rubber PTT cover which reveals five contacts next to the PTT switch. Using a soldering iron and solder wick you remove a bridge between two contacts (preferably without touching the hot solder wick on the case and melting it like I did!) then you short out two other contacts while turning the radio on. You can then choose various channel options including three for hams: Code 0 (10m + 12m switching between them using the CH9 button), Code 1 (10m band only with home frequencies 29.300 and 29.600 selected using CH9) and Code 2 (12m band only.) I chose Code 0 to get the benefit of two amateur bands.

No batteries are supplied and no charger either. The lack of a charger is a bit annoying as the charger socket is a fairly small barrel type that isn’t easily obtainable (even after you’ve guessed the dimensions.) The battery pack takes 9 NiMH AA cells and has contacts on the bottom. A drop-in charger is available as an optional extra. I will probably make one as I did for the old TH-205E. But first I have to establish what the charging voltage is. The box the radio came in suggests the charger/DC socket on the side of the battery pack takes 12V. You can certainly run the radio off that, but when it is switched off it draws no current. It looks as if you would have to crank the voltage up to about 18V to charge 2400mAH NiMH cells at 240mA, which would probably have dire consequences if you switched the radio on with the charger connected. But with the lack of propagation on 10 and 12 metres I probably have a few weeks to figure it out.

The antenna supplied is about 8 inches long. I checked it using my antenna analyzer and was pleased to find that it was resonant on 28.5MHz with quite a sharp SWR curve. However such a small antenna is probably little better than useless for making contacts over more than a few miles. I have a 45in telescopic 10m antenna and that is what I plan to use with this radio.

The Albrecht AE2990AFS is ready for the new European harmonized CB frequency allocation (which the UK wants to opt out of) so the output is rated at 4W on FM and 4W PEP on SSB. The actual power measured on 10m FM from this radio was only 2.13W. This is similar to what I found with the Intek H-520. With the Intek I was able to get inside, find the power adjuster and tweak it up to 4W. That’s when I discovered why it had been set lower in the factory – the current draw at 4W is just too high for many AA rechargeables to sustain. Most CB users would never know their radio was giving less power than claimed because they have nothing to measure it with, so they would never complain. If it cut out whenever they press the PTT then they would. We hams complain that our radios are expensive but they are built to a higher standard than CB radios. You get what you pay for.

With its 9 cell battery pack the Albrecht doesn’t need to draw so much current as the Intek for the same power. While it was on the bench power supply I measured the current draw on FM “high power” (2W) as 800mA. On the low power position which is meant to be 1W but was actually 0.51W the draw was 500mA. Unlike the Intek there is a “warranty is void if you remove this” sticker over the two halves of the case so I can’t delve inside undetected. As I have heard of people who bought similar radios under other brand names which broke and had to be returned under warranty I don’t want to void it, so I’ll have to live with 2W output, at least until next year.

On SSB the modulation out of the box was almost nonexistent. This is dependent on the mic gain setting, which can be adjusted from the front panel. After increasing it the SSB modulation was much improved and although I don’t have a peak reading meter the average level gave me to believe I was getting 4W PEP.

The audio on SSB sounded clean but if you increase the mic gain in order to get reasonable talk power there is noticeable frequency modulation on the signal. I am guessing that the battery voltage sags a bit on speech peaks and this pulls the local oscillator. I had read about this issue in some forums discussing the other incarnations of this radio and someone stated that in the Albrecht versions this problem had been fixed. It appears this may not be the case. I doubt that the fault would make the audio unreadable but I would expect to receive comments about it.

I recorded a number of audio samples at different mic gain settings for comparison. You can hear the FM increase on voice peaks as the mic gain increases.

• Albrecht AE2990AFS SSB audio – mic gain 7
• Albrecht AE2990AFS SSB audio – mic gain 8
• Albrecht AE2990AFS SSB audio – mic gain 9
• Albrecht AE2990AFS SSB audio – mic gain 10
• FT-817 audio (for comparison) 

When configured for ham band use the radio displays frequency as you would expect. The display has an attractive blue backlight. Tuning is by up/down buttons at the side. There is an annoying beep at every button press, but this can easily be silenced. The standard tuning step is 10kHz which is a bit large for convenient band scanning. You can change the step size for fast or slow tuning – the steps are 100kHz, 10kHz and 500Hz. The 500Hz step size is still a bit large for satisfactory SSB tuning. There is a clarifier control but it works on receive only. So some people you call will complain you are off frequency.

There are five memory channels which store frequency and mode, so you can switch quickly between FM and SSB calling frequencies for example. You can select a shift or offset of up to 990kHz for repeater use. There is also a CTCSS tone for repeater access, but the manual implies it is a fixed 88.5Hz tone which (apparently) is used by 10m repeaters in the USA. This is straight from the manual – I can’t vouch for it.

With the lack of any propagation on 10 or 12 metres I obviously haven’t had a chance make any contacts with the radio or evaluate the receiver sensitivity. The RF gain and squelch sensitivity can also be adjusted from the front panel in the same way as the mic gain. There is even a roger beep!

So there you have it. The below-specification power and FM-y SSB audio are fairly major faults, all things considered. But the Albrecht AE2990AFS is the only true handheld SSB-capable radio for any amateur band currently available. If that’s what you want, it’s your only option.