There are so many very cool aspects of this project: I love the phasing receiver arrangement — it uses the same basic concept that allows my old HT-37 to generate SSB (I struggled to understand it as a kid, and finally succeeded!). The use of the mobile phone as an audio spectrum analyzer is wonderful. The N3ZI signal generator looks a lot like the DDS project I was working on (I should have bought N3ZI’s! ). I’ve been seeing these square pattern PC boards in many projects lately — I may try this in my next project. And of course, it is very cool to see a circuit designed in Poland being put to use by a fellow radio amateur in Australia — a good example of the International Brotherhood of Electronic Wizards!
Here is the page for the SP5AHT rig that inspired Peter:
http://www.sp-qrp.pl/modules.php?name=Content&pa=showpage&pid=54
It is in Polish, but Google should translate it, and, in any case, we all speak Schematic!
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Thanks for your kind words Bill. SP5AHT is a prolific designer and has developed both filter and phasing rigs. The one in your link is his filter method rig. His phasing rig that inspired me is described at http://sklep.avt.pl/photo/_pdf/avt2906.pdf I made changes that simplified it and avoid the need to wind big audio inductors. More details on a slightly improved version to appear in a future Sprat. 73, Peter VK3YE
This design is not new, SP5AHT copied it from the Russians. Link to similar transceiver http://www.cqham.ru/trx_b.htm
Brilliant! Performance per part is impressive. I installed FrequenSee on my phone while watching the first video, and my spectra looked just like Peter’s. Very cool, thanks Peter and Bill!
Looks like a design by Polyakov…
More information can be found in the book by Polyakov http://www.cqham.ru/ftp2/RLTPP.djvu NOTE: The book is in Russian