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We had another cold snap hit us here with a wind chill in around -20C  it was time for some indoor radio activities. For some reason I settled in on 17m not a band that I frequent all that often, not sure why but never seem to stay long on this band. When looking at the P3 band scope the band did not look very active but as I slowly scanned across the band I came across some stations calling CQ. The first station was ZB2FK on Gibralter. There was not much of a pileup at the time when I made contact and I did receive a 559 from him and with 5 watts from an MFJ 1788 loop antenna I was very pleased with that contact. I then came across IW1DFU calling CQ again on 17m and I gave him a call he did come back to me but I had to repeat my call but again he gave me a pleasing 559 report. I then came across KH2L in Guam and he was in and out with the noise floor but I was very happy the loop was even picking him up! It was time to put the filtering of the K3 to use. I dropped the filter to 250 hz and added the Audio Peak filtering feature and that

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was all it took to bring him off the noise floor and into plan old CW. There really was no pileup to speak of but some where in line before me and I wanted to wait my turn. The propagation was such that his signal was up around S5 and then just at the noise floor. This is the exciting type of DX I like to try to work, it's a challenge and it could be hit or miss. It is very unusual for me to even hear signals from this part of the world but today at times he is S5. When given the opportunity I dropped my call and hoped for the best. Have you ever had this happen.......I for sure thought he was coming back to me and it happen to be the one time he was in the noise floor but maybe I was not at his end but at a possible S5. So I came back to him..........but it was not to be it was if the static was playing head games with me and coding VE3WDMmmmmm. To make a long
story short one of his contacts had spotted him on a cluster and then all hell broke loose!! My time was up as a HUGE pile started. I'm not saying QRP stations have not busted pileups but time was moving on and dinner was soon going to be on the table. KH2L maybe next time, I am not at all disappointed as these types of events help sharpen your skills and really allows you to become familiar with your radio. 

Good afternoon fellow bloggers between work, getting over a nasty flue bug and running around doing none ham stuff it sure has been a long time since my last post. I have been able to get on the internet and check out the blog posting of fellow bloggers.......BUT as for on air time is has just gotten away from me. I have had some opportunities to get on the rig and for some reason all hell with my PC would break loose. I like to run a PC to both operate my K3 and to log contacts. Since we have moved and I have setup the PC at our new location hoping all would be well.  It seems all the USB ports were not matching what the software was setup even though all was setup the same……PLUS my VSP manager program which provides me with virtual com ports it just for some reason went A.W.L from my PC! There has been more screw ups but the most recent and I hope the last was a request for a video card up date. I said yes and as it was loading it told me that most if not all of the updates would not apply to my PC. Well that would be a waste of hard drive space I  chose to not install the up date. I was then to restart the PC....sounds simple....WELL....the PC started in safe mode and to make a long story short I had to reload the the drivers for the video card, setup the two monitor option (which reminded me of how much a pain in the ass it was) finally setup the resolution as well.
So things are up and running and on Friday I was able to make a fast contact with LY10NATO. This as you guessed it is a special activity call pertaining to NATO.  The contact was made with 5 watts and my MFJ 1788 antenna. The weather here is still a winter wonderland with 15cm of snow on Wednesday, then it was temps of plus 9C on Friday and now this evening a cold weather alert has been issued! Anytime this winter wants to exit…… all the better.

At the start of the year I did some experimentation with cheap DDS modules based on the Analog Devices AD9850 connected to the Arduino board, making a rudimentary WSPR transmitter prototype.

My current licence restrictions prevent me using anything home-brew for transmitting except for commercial kits. So I ordered an Ultimate3 QRSS beacon kit from Hans Summers (G0UPL) thinking that it would be okay. I subsequently learned that any commercially available kit must satisfy IR 2028 which is all a bit vague and unclear but sadly I don't believe this particular kit does.

All was not lost, building this kit should more than satisfy one of the practical assessments of the intermediate examination, which will get me around this problem.

The Ultimate3 kit is extremely popular and so I had to wait a little for delivery and it arrived on Friday. After the last few weekends of non-radio activities I had planned to get my antennas backup and do some proper operating. Like many people I had been forced to take everything down due to the barrage of storms and high winds the UK has been experiencing recently.

A tidy workbench

Saturday saw no let up in the wind, so I decided to spend a few hours building the kit instead.

The instructions were extremely clear and straight forward and soon had it built up, though it is high time I invested in new soldering station. I have a basic Antex 25W iron. I cannot remember exactly when I brought it but it is well over 10 years ago.  It was more than adequate to build this kit and for soldering connectors but I could do with something adjustable and more comfortable.

Taking shape

The only issue I had was winding the first toroid, 25 turns later I realised I had wound it the wrong way round so the leads didn't line up with the holes in the PCB. I could have made it fit but nope I will do it properly so I unwound it and did it again.

I also made the mistake of not scraping the enamel off the toroid wire and tried the heat it and bubble it off method, except I think my iron just isn't hot enough so ended up using a piece of wire wool to remove the enamel.

Lessons learned I soon had the other three toroids correctly wound and wire prepared for the low-pass filter board.

Close up of the LPF

   A final visual check and powered it up and it worked first time!

All built

It works!

Setting it up

Full of confidence I grabbed my trusty GPS module which has been pressed into service on a few Arduino projects including the HAB project. Quickly soldered some connecting wires and powered everything up.. all was well or so it seemed when the display suddenly went blank, backlight was on, just no characters.

Pressing the button I occasionally got some random characters and a flashing cursor! I de-soldered the GPS and still nothing. I suspected the display was faulty but trying it on the HAB prototype board confirmed it was okay. I checked the display connector continuity and everything appeared okay.

Out with the oscilloscope I started probing, everything checked out. Crystal was oscillating and data pulses on the display control lines. Then I checked the supply pin on the display and it was only reading 4.1V, this under-voltage would explain the odd display behaviour.

PSU output was 5V, micro-controller was 5V, DDS module had 5V. All very puzzling till I removed the DDS module and spotted a discoloured track on the PCB, touching it with a screwdriver and the lacquer fell away revealing a tell tale scorch mark, somehow I had made a nice resistor!

Burnt track to right of micro-controller

A quick wire link soldered in place and everything was back to normal.

What caused it? Checking the de-soldered GPS connecting wire I spotted a stray single strand of wire on the ground wire. I suspect this must have shorted to the adjacent 5V line and since I was using a nice beefy ex-PC PSU as a bench supply it had popped the track without the hint of a flicker. The GPS has been rewired properly and is working nicely, now to connect a dummy load and experiment some more.

Sunday was a lovely day, wind dropped so antennas have been put back up and I took the opportunity to tidy up the installation a bit. I also dug out an old fibreglass pole to put the M0CVO HW-20HP back up. I didn't get to do any operating in the end as by the time I had done this and made up a couple of decent patch leads it was time for roast beef and all the trimmings and an evening in front of the TV.

The HW-20HP back up

Putting PL259 and N-Type connectors on coax is also part of the intermediate assessment, so perhaps I should have videoed making up the patch-leads as proof ;-)

Pumping out 1/2 a watt

On Saturday I was very pleased to see that my MFJ 1788 loop antenna was getting out. On Sunday it was time to push my luck to the limits, here are VE3WDM I always like to see how little power it take to make a contact. It seemed yesterday 5 watts most if not all the time was getting through. Why stop at 5 watts it was time to drop the Elecraft K3 below the 5 watt maker.............wayyyyy below! The conditions once again were very nice Flux levels were up along with the Sun spot count but the K index was also in around 4. That did not seem to matter the bands were full of contest action. Once again I stayed on 15m and it was very busy with DX from the contest. Today I made only 20 contacts as there was chores to get done around the house.

Hard at work

Yesterday's post concentrated on the country count and locations today's post is all about power levels and miles per watt. From 5 watts I dropped down to 2 watts to see what would happen and DK3GI was in my cross hairs. I was able to make the contact first call which gave me 2020 miles per watt. From there on out of my 20 contacts 19 were all over 1,000 miles per watt. Here is a run down:
1 contact made at 3 watts
4 contacts were made at 2 watts
7 contacts were made at 1 watt
6 contacts were made at .5 of a watt
1 contact made at .1 of a watt
1 contact made at 5 watts ( this being the only contact not netting me 1000 miles per watt)
Some of the miles per watt numbers
II9P at .5 of a watts netted me 18,470 miles per watt
K5RT at .1 of a watt netted me 11,808 miles per watt
CN2AA at .5 of a watt netted me 7682 miles per watt
F8CIL at .5 of a watt netted me 7662 miles per watt
F5NBX at .5 of a watt netted me 7608 miles per watt
CS2C at .5 of a watt and netted me 7216 miles per watt
This contest I was just a point giver and not in the contest to submit a score. I wanted to test out the MFJ 1788 antenna to see how my location and antenna performed. Some things that still have to be done, I have to get the contesting software and radio control software up and running. Have the SWR problem on 10m and 20m figured out with the MFJ 1788 loop, for some reason the best SWR I can get is around 9! On a positive side this contest proved to me that the antenna will get out even with QRP or QRPp power!!

The K3 doing it's work

I was able to get in a few hours in the ARRL CW contest this afternoon and  operated only on 15m. My output power was QRP 5 watts into my balcony mounted MFJ 1788 iso-loop. I was pleasantly surprised with the results I was able to make 40 DX contacts in 23 different countries. I was not able to make any 1,000 mile per watt contacts but I did come close at 4500 miles (using 5 watts). I found the noise floor to be just great and the EU stations were just booming in. There were some stations that did have trouble with my signal but over all exchanges were made first time.
My SWR was in around 1.4 to 1 and it was very simple to adjust the SWR as I went up and down the band. You just have to get the hang of tuning the loop and it is a simple push of the fine adjustment button and your all set to go. This evening I tried 40m and there was lots of EU stations but for some reason I was not able to make any contacts so after a short time I shut things down for the evening.
Tomorrow I am going to try to make some contacts with less than 5 watts and hopefully get some 1,000 miles per watt contacts.
Some of the highlights were:
Tunisia
Balearic Island
Finland
Alaska
Nicaragua

The FT-817 is a great little radio. It has been around for 15 years and was the first QRP radio, that I'm aware of, that was designed for backpacking and covered 160m through 70cm. It is housed in a rugged package that is efficient, and is relatively easy to pack. The radio sells for ~ $660 and is a great value for the money. It has been the undisputed leader of it's class until the entry of the Elecraft KX3 came to market. The KX3 is a fine radio that clearly has more bells and whistles than the FT-817 although it is doesn't cover 2m and 70cm in its base model.

I have both radios but favor the FT-817 for SOTA expeditions when I choose to carry an all band radio. (I usually carry CW only radio that is much lighter, but carry the FT-817 on some trips). Clearly the out of the box filtering is better on the KX3, but so is the price. You can buy two 817's for the price of a KX3. However that said, I set out to modify my 817 to see if I could close the gap between the two. So I added the W4RT On Board Filter ($284) with both SSB and CW (300Hz) filters. I also added the BHI DSP filter ($169). These prices include installation by W4RT, if you do it yourself you can save a few bucks. These modifications, in my opinion help to close the gaps between the two radios considerably.

Below are some very basic, unscientific, comparisons of the two radios on SSB and CW.

CW Comparison



SSB Comparison




As you heard in the videos the differences boil down to a matter of taste. I think the 817, with the 300Hz filter comes very close if not better than the KX3 on CW, on SSB the KX3 has the advantage but the DSP does clean up the noise and the SSB filter does sharpen the 817 audio considerably. I favor 817 for outdoor work and the KX3 for the in-shack QRP radio.

In future blogs I will discuss a couple cool additions to the 817.