I was embarrassed to spot an error in the way I’d drawn the secondaries of the transformer in the schematic in SPRAT – corrected below...
I now have a hugely flexible experimental platform, on which I can mess about with some new ideas. I haven't made a driver or PA stage (because I'm not interested in transmitting with this set-up - it has just been made to investigate some receive concepts). But all the functionality is there - this is a complete BI-DIRECTIONAL system, missing only the mic pre-amp, driver and PA. I have those - of course - in my main h/b rig.
An interesting experiment but – most important - it has been fun to build.
...-.- de m0xpd