Recent content by Martin Armfield

Hi. The sidetone audio does come from the modulator audio signal so I believe you are correct that there is no modulation. My best guess is there is an intermittent connection in the modulator audio path that comes and goes with engine vibration. It could also be the boost converter being...

I don’t think the problem is the boost converter if it transmits fine on the ground but not in the air. That is truly strange. I can’t think of any reason there would be a difference in the air unless engine vibration is causing a connection to fail somewhere. Can you give more information on...

Don’t know if it still matters to anyone but I have a fair amount of experience working on mk12d radios. As one member stated it could be a number of things. So far I have worked on two of these that have a transmit carrier but no modulation or intermittent modulation. In both of these the...