[Collins] KWS-1 RX mute issues.

[Dr. Gerald N. Johnson]

A workable solution, though the plastic of the paper protector probably 
will wear through. A bit of mylar like from a drafting original would 
wear better. Or thin fiberglass circuit board. Another work around might 
work if the antenna relay has auxiliary contacts, they can do the 
receiver muting.

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

On 6/1/2014 7:07 AM, Bill Riches wrote:
>
>
> Noticed that my KWS-1/75a4 rig was not muting at times. Found a problem in
> K101 and here is how I fixed it.
>
>
>
> Pin 9 of K101 has 350 V that contacts pin 8 when keyed.  Pin 8 of relay
> moves pin 6 of relay to open rx mute circuit.  There is a black insulator at
> moves pin 6 from pin 8.  This insulator breaks down and puts the hv on the
> mute line.  Good news! You do not have to replace relay.
>
>
>
> I cut a 1/8 x 1 inch of plastic sheet from a page protector sheet and put it
> between the insulator and the actuating relay leaf.  A drop of GC service
> cement at the base of the leaf seems to hold it in place.
>
>
>
> Working on the rig with the right side down on the bench puts everything in
> sight.  At least these contacts were accessable.
>
>
>
> To check your rig: Disconnect mute lines from rx,  check for voltage between
> both mute lines from tx with tx keyed (hv on), and if you see ANY voltage
> you have a problem.
>
>
>
> 73,
>
>
>
> Bill, WA2DVU
>
> Cape May
>
>
>
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