[Kenwood] Kenwood MC-60 mic audio feedback in base

Wed May 22 08:31:37 EDT 2013

On Wednesday, May 08, 2013 08:50:51 AM Terry Clinard wrote:
> Does anyone have a cure for audio feedback when using the base of the MC-60.
> Problem does not occur when using the mic by itself less the base. Thank
> you
> Terry WA8OPR

You need to add .001uf / 50v ceramic disc bypass capacitors between the audio 
input and the case (ground) and the audio output and case of the amplifier 
board in the base unit. Also I would add one between the DC power line input 
and ground. These amplifiers are notorious for generating feedback when there's 
any RF floating around in the shack.
I'd also recommend that you check your SWR into your antenna. Typically when 
this condition occurs it is an indication of high SWR causing the rig case to 
be 'RF hot'. 
73 Bill W4WHW