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Hi, Tony

The reason I asked you to try the code practice function is that I think you are barking up the wrong tree. There's no coon up there.

All 5 of your "red box" voltages are connected with IC5 and IC6. Because the radio has 2 parallel audio channels that are combined after IC6, you could remove IC5 and IC6 and the radio would still function - it would just have receive on both side of zero beat. The alignment tone would be the same loudness. You just wouldn't be able to get a null with the pots. The code practice audio is injected after IC6, so if it doesn't work, the problem is after the detector, preamp, and sideband filter.

Jim Daldry

P.S. I'm a retired consumer electronic tech, almost 50 years on the bench. I've built a Tayloe detector radio freehand on little adapter PC boards for the smd parts, and perfboard for the rest. Power supply and audio output are dead bug style. I just didn't get around to building the transmitter and re-flashing the '328 with transceiver code.