now to sort a microphone.
tried a couple of microphones I had, but although I could get it working on transmit, there was no "hiss" on receive, and no change in the noise when the mode selector was changed. screwdriver on the volume pot produced plenty of hum, so suspected no supply to the receive side.
had a look at the circuit and the stabilised supply rails are switched by a couple of transistors, checked the receive one and sure enough open circuit. this was changed and the radio burst into life.
https://youtu.be/Tb9Cy4k1Qkg
Gave it an airing on the North West Net, and the mixer crystal was found to be slightly off frequency. this was trimmed on air
https://youtu.be/yJJD1bLQ3tY
now spot on ( on mid band ) and a quick look round the shack
https://youtu.be/yJJD1bLQ3tY