The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

Thanks but the mic board does not have a coil on it only a couple small caps, does anyone know where I could find a schematic for this radio? sure would make it easier to troubleshoot the audio section as no matter where I touch the scope to the squeal is present

I should have mentioned the radio will still transmit with mod, but the tone is super-imposed with the signal and I have tried different mics with same result.

Thanks for the suggestion , I will check it out , it would be helpfull if I could find a schematic for this radio would make trouble shooting a little easier, is there any where on the web I could find one?

This radio worked great until my friend tried a new antenna with it now it squeals on transmit ( only on the am side) but not really a squeal that varies , more like a constant tone on the carrier, it does not vary with the modulation . anyone have any ideas as to what could cause this ?
Thanks