I renew my request for info, circuit, wiring diagram etc for the Redifon HF transmitter receiver; GR-410 tx/rx (also known as the C14 in military use) 6211R ac psu 6212A dc psu If anyone can help with info it would be a great help. It's a shame to see the set sitting on the floor unused and unloved. regards, Ben G4BXD.