A compact QRP radio transceiver for 28 and 144MHz SSB (SP-8)
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- เผยแพร่เมื่อ 27 ก.ย. 2024
- A compact QRP radio transceiver covering both 28Mhz and 144MHz SSB. The transceiver is scratch built for 28MHz using familiar techniques and components. A commercial 28 to 144MHz transverter built into the rear of the chassis extends coverage to include 144MHz as well Two great bands in a slimline backpack friendly rig.
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Sometime the TH-cam recommendation algorithm comes up trumps. What a gorgeous build. I'm envious of your construction skills! 73, 2E0LNS
Thanks Matt. It was a fun project. Haven't used it much on 10m, must get it out now that the band is working!
Well done Peter, great work there.
Thanks Stephen, a bit orf work but lots of fun!
Hi Paul, greetings from France, once again incredible work, I can see the hours of thought that must have gone into the Development of your transceiver, the golden band 10meters great idea, sounds very good to, I have converted some old side band cb rigs in the past, great band 10meters, fantastic work thanks for sharing 👍 stay safe.
Hi Peter, thanks for commenting. 10m and 2m are an unusual combination in one radio. When 10m comes alive ( in a few years? We hope!) I expect this rig will see quite a bit of use as you don't need much power when the band is open. 2m SSB is an ideal portable band, small gain antennas, sufficient activity, base stations point high gain arrays at you. Stay safe in France, I will get back there one day...
very neat rig, Paul, well done. I can only dream of designing and building something like that. I noted that one of your recorded contacts was with VK4DO who I worked on 10m last Saturday from a summit near the Sunshine Coast of VK4. quite unexpected to play your video and hear part of my contact with Frank. 73 Andrew VK1DA
Thanks for commenting Andrew. The recording of VK4DO was eavesdropping, I did not have a QSO with him. It was your spot from VK4 that made me turn this rig on. I hoped to hear you. Unfortunately I didn't, but the band was open and I heard the QRP beacon on 28.205 and the tail end of the VK4DO QSO just below 28.500. You have probably realised that homebrewing these rigs is to me what activating is to you! My main passion! 73 Paul VK3HN.
Absolutely brilliant Paul! Thank you for the walk-through of your schematics too. I am interested in your idea of controlling the PA bias via the Arduino. That's not something I'd even thought of! I like it because I guess you can set a delay of so many milliseconds before it is applied and give other relays a chance to fully engage before letting the RF loose! That's definitely something I'll be playing with in the future. Keep up the great work - I love your rigs and they inspire me to build smaller and more compact. I think I'd struggle to trek up mountains with a big bread bin!!! 73 Nick M0NTV
Thanks for your informed comment Nick. You appreciate what's involved in homebrewing an SSB transceiver. You pick up these ideas as you go along. I saw the Arduino control of the PA bias in an external RD16HHF1 WSPR amp, by fellow Melburnian Glenn VK3PE. With the bias in the T/R sequence you really feel confident that everyhting is switching safely, not that important in a QRP rig but worth doing nonetheless. And in an Arduino controlled rig, the precise timing is in software, the ultimate convenience! As for building compact rigs, its something I've moved towards in the last few years. Getting comfortable with surface mount is the key. Its not for everyone. If you look at the better HF transceiver products prior to, say, 2010, the best design is where the physical layout, the radio 'product design' and the RF design all come together. Keep homebrewing, I love seeing your videos. 73 Paul VK3HN. PS: Don't get heat-stroke today!
Hello, Paul... could this design be used to transmit and receive on the 1.25m band for Zone 2 and Somalia instead of 2m? I'm not sure which portion of the electronics you would change out, if you even could. Thanks and -73-
Brian, thanks for your comment. The 28MHz transceiver can drive any VHF UHF transverter. If you can find a 28 to 220MHz transverter, it would work just fine. I built the 28MHz receiver/exciter and connected in a transverter from a Ukrainian supplier. You could attempt to build the transverter part but its not a beginner or intermediate project. Good luck.
I have very light Trx QRP "Kacper2" handmade homebrew 40/80 on my bicycle or backpack ..10W 20sec voice recorder .. 73! SQ9FCB Krakow Poland
I had a look at Kacsper 2, looks good, 80 and 40m SSB, 10w, a good option for mounting on a bicycle. What antenna did you use and what was your longest distance QSO?
@@Paul_VK3HN short version w3dzz (rtx Kacper2 with PLL .. old ver was "Bartek QRP" ) weight like pepsi can
Qso 7.1 Mhz ..range over 300 km . I have two movies in my Yt chanel pls find .. link ( is blocked by Y...)
@@RadioMalopolska Sounds like fun, and you could ride to a quiet RF location!
Amazing, amazing work! Well done!
Tnx!