[Collins] 32S3 Transmitter self oscillation

[Dr. Gerald N. Johnson]

On Sat, 2008-10-11 at 21:00 -0500, Jaime Gomez wrote:
> I have traced the problem in my 32S3 to a self oscillation, I am not
> sure if it is the driver or the finals which are self oscillating. Any
> one has had experience with it and can give me a hint what may be
> causing it?
>  
> Thank you,
> 
> Jim, HK1N

Grounding of the shield cans below the chassis is critical to not
oscillating. 

In the 32S-1 there is a feed through bypass capacitor on the PA grid
circuit that is part of the neutralization circuit that is prone to
failure. But if you have the air trimmer for PA neutralization that
probably won't be the case.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer