QRP

I have completed the Smallwonder SW+ 20, it is now in a diecast box and just needs the controls labelling. There is space for a keyer and the RIT which will come later.

First contacts have renewed my interest in QRP. At the moment the rig is attached to an end fed half wave literally dropped out of a first floor window which is about 3m above ground. The other end is attached to a post about 1.8m high. The first QSOs have been at distances of 2000km+ and last night I had a 2 way QRP QSO (2W – 5W) at ~ 1500km. I am constantly amazed at what is possible with just 2W output and a simple antenna.

One question; when listening to QSOs with 5-9+ or 599+ both ways, why do ops maintain high powers? Why not reduce power and QRM? I remember doing that with an SSB contact to VK and we got down to single figures. Sunspots help!

(Click image to enlarge.)

Update 20 Aug 2010
I just had a QSO with K4CMH using my main antenna, an inverted L sloper. My report was 549 which at 6062km, or 3768 miles, on 2W was quite respectable!

  • Share/Bookmark

Ofcom, BBC and investigating interference

The RSGB news pages are carrying a clarification as to who is responsible for investigating interference to broadcast transmissions and amateur radio. The RSGB say:

The position is that the BBC is now responsible for investigating interference affecting domestic TV & radio broadcast reception. [...]  Ofcom remains responsible for investigating interference to the amateur service, and to broadcast services originating outside the UK.

Full item on the RSGB website (Memebers only)

  • Share/Bookmark

Spectrum defence fund

Like many others I donated what I consider to be a reasonable amount of money to the spectrum defence fund. I did that freely as I see the use of power line communication devices as a real threat to the HF spectrum.

At first it looked as if the RSGB were making waves (excuse the pun!) but all seems to have gone quiet. With news that Ofcom have passed responsibility for investigating broadcast interference to the BBC who is now responsible for rooting out QRM to short wave users? My guess is that Ofcom ‘passed the buck’ willingly as it gets them off the hook. Not sure what powers the BBC will have to help us and even if they are interested in amateur radio PLT problems.

So where does that leave the spectrum defence fund?  What is the RSGB planning to do next? I realise they cannot make public all their plans in case it compromises legal action but I think they owe the many people who have contributed some sort of explanation of the current position.

  • Share/Bookmark

Active Sun

Looks like the sun had an active weekend. There was a C3 flare plus other eruptions yesterday, 1 Aug 2010. The spacewether.com site said “In short, we have just witnessed a complex global eruption involving almost the entire Earth-facing side of the sun.”

With a CME is heading our way there might be a chance of auroral openings plus the usual lousy HF storm conditions. At least we are getting a few more sunspots of late.

Read More
Spaceweather.com
Solarcycle24.com

  • Share/Bookmark

Simple enjoyment

I have just finished building a Small Wonder Labs SW+ 20. Nothing spectacular in that but using it for QSOs yesterday took me back to my first brush with radio.

Around 50+ years ago I discovered a box of crystal set parts in my grandfather’s shed. After much haggling I was allowed to have them. As I remember there were some old coils, capacitors and other bits he had used to build his crystal sets. The end result was that I was hooked and built a ‘modern’ crystal receiver.

Building the SW+ 20 kit brought back some of the thrill of the early days. What helped was the antenna I used for the first contacts; an end fed half wave which stretched from a first floor window to a post used for the washing line. It is never more than around 3.5m high and slopes to 1.8m.  (Click image to enlarge)

The first QSO was over 1000km and others during the day were near 2000km with an output of just 1W. Again this is nothing exceptional but I got more of a thrill from it than using modern commercial rigs at my maximum power of 100W.

In these days of ever increasing complexity of radio equipment, not to mention the expense, it is good to go back a few steps and rediscover what real ham radio is like. I will box up the kit, make a new EFHW tuner, go /P with this mini rig and have some fun!

Small Wonder Labs

  • Share/Bookmark

Winning

It is about 50 years since I first started playing with radio. Driven by a fascination with stories of my grandfather’s crystal sets and the box of old looking components left in his shed. This was in the time of big valve wireless sets and long wire aerials to poles down the garden.

Amateur radio was very different then, most stations were on AM apart from a few who used the new fangled SSB. There were also many on CW which was hard to decipher on the house AM set.

When I did get an AR88D things suddenly improved and I could hear the world. I quickly learned that hams were a friendly bunch and got many offers of surplus equipment and practical help. It was not long before I started building stuff and the sheer excitement and pleasure from gathering components together and making a working receiver is something I will never forget.

So, 50 years on what of today? I could lament the loss of technical skills, complain about the low exam standards, moan about bad operating practices and generally go on about things not being the same as they were. But I still get a kick out of building stuff and operating simple equipment so not much has changed. Or has it?

What really bothers me is that the technical challenge as all but gone. All you need now is a wad of cash to buy everything from the latest SDR rig to the cables to connect it all together. Yes, there are some ops that cannot solder a PL259 plug to a coax cable. Does that matter? Yes and no would be my response.

The demise of technical skills has taken away the thrill of learning and making. That achievement has been replaced by contests, DX chasing, having the biggest and most powerful station and being able to send the fastest Morse!

All of that is a way round the lack of technical achievement and all of it is, in many ways, just superficial fluff that obscures the true meaning of amateur radio i.e. self-training in a technical hobby. And, I believe, it is losing the goodwill to fellow hobbyists in the process as we are all seen to be in competition with each other

Take for example a recent discussion on the FISTS email list. A simple question was asked, ‘do you match the sending speed of another op when replying to a CQ or when someone replies to your CQ’? That used to be just a common courtesy, good manners and generally was within the ‘spirit’ of ham radio. Now, it seems, to even ask the question is an attack on the high speed ops. But why? Perhaps it is the current obsession with winning, contests, DX awards anything which proves you have the better station or are the better op. For many that has taken over from technical achievement as the reason to pursue the hobby.

There is nothing wrong with achievement but when it means trampling on others, ignoring them, getting one over them etc then the hobby has lost an lot of what made it special. Yes, win contests, prove you can send high speed Morse but please never forget that we all rely on the amateur radio community for the very existence of our hobby.

  • Share/Bookmark

End fed Half-wave antennas

I came across the site of AA5TB this week and found his excellent article on end fed half-wave antennas. Like many others I have always thought that it was difficult  to match the high impedance of an end fed half-wave to 50 ohms. Not true! After reading the article I made a simple matching unit and it worked first time. Thinking about /P activity (when it stops raining!) I will definitely try an end fed half-wave for 20m and do a comparison with the homebrew Buddipole.

Links to AA5TB’s articles
The end fed half wave antenna
QRP 30m through 17m end fed half wave antenna coupler/SWR bridge

How to make an end fed half wave antenna work

My project – 3 band portable wire antenna

  • Share/Bookmark

Increased power for contests?

According to this post some Irish ops want more power for contest operation. The idea is that if they had more power, 1.5Kw, it would help them compete with the big guns.

My biggest concern is that contests already cause a lot of problems and that increasing power limits will just increase the QRM levels and the frustration of non-contest ops.

Now before there is the usual howl that I am being anti-contest I am not! Contests have their place but they are not all that ham radio is about. I have said this many times but if you work during the week and only have Saturday and Sunday to pursue your hobby and then find it is impossible to have a ‘normal’ QSO there is a high chance that you might ‘go do something else’. That is what some contesters have advised and unfortunately many have complied.

Higher power will not change anything, the end result will be the same; those with the biggest antennas, biggest amplifiers and biggest bank balance will win. So what? What does that prove? What does that do for the hobby?

If you do not want the power increase in Ireland then please voice you objections by sending an email to  Thos Caffrey EI2JD at contestmanager@irts.ie or   thoscaffrey@hotmail.com

An email/letter to the RSGB might be a good idea because you can be sure that if it happens in Ireland it will happen here!

  • Share/Bookmark

Portable nostalgia

I recently discovered some photographs of one of my first /P events. The pictures were taken on 3 May 1972 at Burton Dasset hills in South Warwickshire. I think it was a 2m contest.

The transmitter was cut from a Pye Cambridge with valves in the RF section and a transistorised modulator. It was supposed to give 10w output but I had no way of measuring that and guess it was somewhat less as the valves were quite old.

The modulation was AM and I do not think I had modified it to the new fangled FM mode at that time. HT was supplied from the inverter on the small chassis to the left of the TX which also came from a Cambridge. Crystal control meant that there were only 2-3 frequencies available for transmit, as I remember one of the knobs on the front panel switched the crystals. This caused problems as most people had the same frequencies so that could make some channels congested.

Operating meant calling CQ on your channel then tuning high to low or low to high to find another station calling you. Very hit and miss by today’s standards.

Sometime later I built an ultra stable 8mhz VFO to replace the crystals from an article in the October 1971 edition of RadCom. It used an Oxley Temptrimmer  to give the temperature stability. The VFO allowed me to quickly tune to the edge of the band where I could nab a station tuning for a reply.

Unfortunately the VFO was never suitable for portable operation so it was back to the crystals.

The RX is a Heathkit GR78 fully transistorised general coverage receiver which I still have. There was a copy of a Microwave Modules 2m converter screwed to the back. The receiver tuned 4 – 6 Mhz  to cover the 144 -146mhz 2m band. This was a common way to get VHF on an HF receiver.

The antenna was a 6 element Jaybeam Yagi on a Jaybeam portable mast which later had another extension section added. The car was a battered old Morris 1100!

All good fun and relatively simple gear but it worked! No DSP, low noise front ends or massive antenna arrays, just a few watts of AM. I well remember using the same rig at home and having a QSO with F9NL in the Pyrenees whose audio quality was very good, but there again AM was always better!

(Click an image to enlarge)

  • Share/Bookmark

5mhz NOV extended to 2015

There is news on the Ofcom web site that the NOV for 5mhz is to be extended to 30 June 2010.

You will need to reapply for a new notice of variation, NOV, to your licence  to operate on 5 mhz after June 30 2010. The application form is here.

  • Share/Bookmark
/home/m5fraorg/