AmateurRadio.com

When you are out in the field, especially on a windy hilltop, logging the contacts you make can be a bit difficult. One hand holding the radio or microphone leaves only one hand free to hold down the log book and write in it. If you’re using a hand-held and standing up to get the maximum height gain, it’s even more awkward.

A few weeks ago I hit on the idea of using a personal digital voice recorder. Initial researches suggested that they were a bit expensive – many models sell for around £70 or more. But diligent searching on eBay revealed that it was possible to buy them for much less than this.

The one I got is an Olympus VN-100 Digital Voice Recorder and cost £15.99 including free postage. It was described as “refurbished to new condition by Olympus.” This might be an indicator of a product that tends to fail and has a high number of warranty returns. However, this particular one was indistinguishable from new, works fine and is simple to use. It isn’t the colour I’d have picked if I had a choice, but price and functionality were the principal considerations.

I don’t know what the differences are between the VN-100 and the more expensive models apart from colour, probably storage capacity. However this model has capacity for more than 13 hours of recording – more than adequate for my purposes.

I find the VN-100 easy to operate with the hand that isn’t holding the radio. You just press one button to start recording and another to stop. A bar meter shows the level of the audio input. You can either say the callsign, time and whatever else you are interested in logging, or just point the device at the radio and make an off-air recording. At home it could be a handy shack tool for recording unusual DX contacts.

The only problem I found is that the voice recorder is just as sensitive to wind noise as the microphone in the radio. More than once I have returned home to find a recording was unintelligible. However, mishaps like this can probably be avoided with practise.

I’m finding my digital voice recorder to be an indispensable companion on portable outings. It’s also handy for jotting down ideas for blog posts that occur whilst you’re out and about!

We are very pleased to announce the winner of
1,000 full-color photo QSL cards
from KB3IFH QSL Cards!

Thanks to Randy at KB3IFH QSL Cards for sponsoring this month’s drawing.
We had over 750 entries!

We’re giving away another great prize in September.
Stay tuned and get ready to enter.

OK, on to what you’ve all been waiting for!

The winner of our August 2010 prize giveaway is…

Read the rest of this post

I picked up an iPhone4 when I got back from Madrid. I’ve been pleased with it. The much mentioned ‘antenna issue’ can be reproduced easily, but a case solves it easily and it doesn’t cause me any issues in day to day operation.

If you’ve been reading this blog for a while, you’ll have seen me mention iBCNU an APRS client for the iPhone. I hadn’t really tried it on the iPhone4 before today, other than swapping some quick messages at home.

The GPS in the iPhone4 seems to lock up on a position much quicker and I found that in conjunction with iBCNU it worked really well from the train in tracking my position and displaying the speed. Top speed on the way in this morning was 125MPH (200KPH), just to the east of Slough. You can see the track on http://aprs.fi – just search for G4VXE-6 – or I did a screengrab a bit earlier.

Hot off the press. An APRS client for Blackberry smartphones is being developed. More information about it can be found here.

The unwillingness of many hams to chat or ragchew on the air is becoming a frequently raised topic on blogs and forums. One QRP blogger recently complained after one of his CQs received a “599 TU OM” type of reply.

It’s sad but, I think the disappearance of the ragchewer is inevitable. Thirty five years ago when I was first licensed, if I wanted advice on something I was doing I would call CQ and hope someone knowledgeable would reply. Much of what I learned about radio after getting my ticket I learned from on the air conversations. Today I would go on the internet where I can find out much more, much faster.

In the late 1980s I added my first modem to my home computer and discovered bulletin boards – the forerunner of today’s internet. There I could chat with fellow computer enthusiasts without any of the aggravations of QRM, QRN and QSB that afflicted ham radio communications. My ham radio usage fell right off to the extent that I eventually sold my gear and let my license lapse for several years.

Whilst playing with radio is fun, especially if you like building electronic things or are interested in propagation, the internet is a much better system for finding like-minded people to chat with and provides more reliable ways to communicate with them. We’re all guilty! Every mailing list or forum thread and every blog post with its follow-on comments is a conversation that once upon a time might have been conducted on the air. The internet has changed ham radio and there is nothing anyone can do about it.

That isn’t to say there is no point to ham radio any more. But the point is increasingly about how far (or where) your radio signals reach, not what you actually say. Contesting and award chasing with their “599 TU” exchanges are popular like never before. And there is lots of interest in modes like WSPR and QRSS beaconing that allow you to see how far your transmissions go without the bother of having to contact somebody and receive a report from them.

The art of on the air conversation is dying out. The reluctance of digital mode users to venture beyond sending their pre-prepared macros is one example of this. Making a ham radio contact no longer requires an exchange of personal information, you simply need to receive enough of someone’s signal for it to be identifiable as theirs. And digital modes have been developed that facilitate the exchange of just this minimum information.

The popularity of the JT65A mode on HF can be explained by the fact that it allows people to make “contacts” without having to speak or type anything, because the exchanges are all coded into the software. VHF enthusiasts now work each other using weak signal digital modes whilst they are in constant contact, not using radio, but via ON4KST Chat, an internet chat channel. When you need to keep in contact, it seems, radio is too unreliable. The same appears to be true for DX Cluster spots. How many people still receive them using packet radio?

The ham bands are becoming no more than a playground for those in which the unpredictable vagaries of propagation provide the key element that makes their activities a challenging and absorbing pastime. But as a serious communications medium, unless you’re half way up a mountain or in the middle of Africa where the internet and cellular networks aren’t available, radio is becoming somewhat redundant.

If you want to talk to somebody about your favourite ham radio topic why worry whether the propagation gods are feeling kind to you when you could just start a thread on Yahoo Groups or QRZ.com or go on Echolink?

A new narrow band digital mode optimized for MF and LF (160m and down) has just been released. Developed by Con, ZL2AFP the new mode is called CMSK.

CMSK uses Minimum Shift Keying (MSK). This is similar to Phase Shift Keying (PSK) but the frequency is shifted smoothly, achieving a 180 degree phase shift within one bit period, with the result that no amplitude variations occur, so the transmit amplifier need not be linear.

The mode has been designed specifically for use on the lower frequencies which provide good phase stability on received signals and low Doppler shift but can suffer from a high level of impulse interference. Four variants are available, ranging from CMSK8 which has a 12.5Hz bandwidth and supports a typing speed of 3.75wpm to CMSK125 which requires 200Hz and gives a typing speed of 60wpm. The default mode is CMSK63 which uses a 100Hz bandwidth and supports typing at up to 30wpm.

The software can be downloaded from Murray Greenman ZL1BPU’s website.

If you are frustrated by the inability to put up as good an antenna as you would like, take a look at the experiments being conducted by Roger, G3XBM, using an antenna made in the ground using 20m spaced earth electrodes. The results are quite amazing.

Unfortunately many of us in the UK cursed with antenna restrictions also have postage stamp sized plots where achieving 20m separation would involve having one electrode in next-door-but-one’s garden. But if your only problem is awkward neighbours, not the size of your plot, this might be something to try.