Tag Archives: CW

Home construction, QRP, solar power 8 months on

When I came back to amateur radio in March 2018, I set myself some aims, more aspirations really.  I said that I wanted the station to be QRP, all homebrew and solar powered.

I have always enjoyed making stuff and now I have finally retired I have a lot of time to do just that. Second, I have previously thrown money at the hobby, got on the air and become bored.

QRP? Life is too short say the kilowatt cynics. Over the years I have enjoyed using a lot of small, home made radios with spectacular results. It takes more effort to winkle a signal out of the noise, but the rewards are bigger. Like many things in life it takes effort and patience to get results but the reward are higher.

uBITX

As the solar power I am trying to reduce my carbon footprint as I fear we are on the brink of a climate catastrophe.  You may not agree but I would urge you to read the evidence, from climate scientists, not newspaper articles, who agree that there is a big problem. Besides saving energy in the home saves money!

80w folding solar panels

So, 8 months on I am back on the air with a uBITX with the mods to reduce spurious emission and harmonics. Next is the AGC board. Using a LiPo battery I can get near 20W output but that is trimmed down to 5W. I also have a 20M QSX and am eagerly awaiting the launch of the multiband QSX.

20m QCX

The auto antenna tuner is nearly finished but in the mean time I have a 9:1 balun at the bottom of the antenna and an L match at the radio end. I can get below 1.5:1 from 106m to 10m which is fine for now.

The only thing to sort out now is a more permanent solar panel battery charging facility. I have the gear from ‘the van’ but want something more permanent.

Last transmission from KPH/KPS/KSM

Just love this video on Youtube. It is the last transmission from KPH/KPS/KSM

UA1OM decoded the Morse:
CQ CQ CQ DE KPH/KFS/KSM NW PLEASE JOIN US FOR THE TRADITIONAL CLOSING MESSAGE # DEAR GODDESS THE MEMBERS OF THE MARITIME RADIO HISTORICAL SOCIETY ARE YOUR HUMBLE SERVANTS AND WE THANK YOU FOR PROTECTING US THIS PAST YEAR AS WE CONTINUED OUR STEWARDSHIP OF THE STATIONS KPH AND KSM THE MUSIC OF MORSE HAS GLADDENED THE HEARTS OF MANY AS WE HAVE CROSSED THE BARRIERS OF TIME AND SPACE WE ASK YOUR AND GUIDANCE IN OUR DECISIONS AND ACTIONS DURING THE COMING YEAR THAT WE MAY BE WORTHY OF THE EQUIPMENT AND TRADITION THAT HAS BEEN ENTRUSTED INTO OUR HUMBLE HANDS BLESS ALSO THE EARS AROUND THE WORLD THAT SHARE THE FRUITS OF OUR LABOURS Z UT 73 / 88 DA DE KPH/KFS/KSM CL AR”

Life is too short….

Last week I heard a QSO on 80M SSB where each op was using 400W and each gave the other 5-9+20db One op said ” I always use QRO, life is too short for QRP”. Reducing their power to ~6w would have resulted in report of 5-9+2db. Why waste so much power?

Interestingly I found this today on the North American QRP CW club web site; “According to Rich Arland, K7YHA (now K7SZ), in World Radio magazine (Feb. 1990, year 19, issue 89, pp. 46-47) the long-distance low power record is held by KL7YU and W7BVV using one micro-watt over a distance of 1,650 mile 10-meter path between Alaska and Oregon in 1970. This is the equivalent of 1.6 billion miles per watt.”

That is why I use CW with a 5W power output limit and often use much less. It takes more effort to work some stations and more skill and patience but the rewards are well worth it especially when using homebrew gear.

SW20

A scratch build Wilderness radio SW-20

This is an amazing build of a favourite of mine, the Wilderness radio SW-20. It shows just how neat and effective ‘ugly’ construction can be. In my opinion it is far from ugly!

I would love another but they are no longer available. Maybe this is what I should do over the winter – build one!

It is interesting that he started with the case and cut the copper clad board to size. It seems like a very ordered way of working.

A Scratch-Build of N6KR and Wilderness Radio’s SST for 20M

I had one of these radios a few years back and made many contacts on it. I did some mods but cannot remember what the function of the extra knob on the left side.