Thanks Bruce.? From? the main circuit diagram the antenna signal wends it's way from the SO239 to AGC switch <already checked this is OK> to an inert tuned circuit (L01/C07)<'9mhz trap'> on the Local Oscillator board and then to Pin 3 on the RF Board 2154.? If Yaesu had tried harder they could have crammed more components onto these boards!? Tracing the actual signal path is not so easy on the hardware...? The local oscillator signal appears to meet the incoming signal at the input to the tuned circuit on the Local Oscillator board.? As both the local oscillator signal and received signals are both present but low strength it would appear to me (but as an 'amateur' I stand to be corrected!) that the fault is on the RF board or possibly the IF board.? I have 'examined' both sides of the RF board under 10x magnification for any obvious fault or deterioration - and 'touched' the components - and can find nothing unusual.? I am not quite driven mad yet but....? Thanks again - great to talk to somebody who knows stuff!? Alistair GM4ENF.
Alistair GM4ENF