[Collins] problems with kws-1 tx audio

[Dr. Gerald N. Johnson]

Fern's problem was no audio on SSB with PTT, but audio if the test key 
was pushed. In the schematic I looked at, the last audio stage cathode 
is switched alone, and that should be adequate to kill off audio on CW 
and tune. Makes me think the ground circuit to the audio stage isn't 
working as it should but gets a sneak circuit through the wires that are 
supposed to kill the VOX on other modes that are grounded by the test 
switch.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association

On 10/23/2010 3:10 PM, ROLYNN PRECHTL K7DFW wrote:
>
> If what I think is happening is true, then this was addressed in HINTS&
> KINKS Vol. 7, 1965 page 40.
>
> Problem is audio in CW mode and erratic VOX.
>
> Fix is to lift the ground end of R103 (680 Ohm) on V101a cathode, lift the
> ground of R106 (1K Ohm) on V101b cathode, connect the two lifted ends
> together and then connect them to S101c contact 8.
>
> With this mod the cathodes float in CW/STBY and are grounded in SB/AM/CAL.
>
> Done on both my units and works FB.
>
> Give 'em hell Fern.
>
> K7DFW
>
>
> ..._._
>
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