[Collins] Wanted: KWM-2/2A Power Switch

[Dr. Gerald N. Johnson]

240 reduces the current but increases the arcing on opening the original 
switch.

SS relays for switching AC virtually universally used either a triac or 
a pair of SCRs in opposite polarity parallel. If the drive level is low, 
they might delay turning on each cycle and become noisy. Otherwise they 
should retrigger each zero crossing at a low enough current to not make 
much noise.

Ac control should not cause any more noise than DC control. And would be 
simple to wire.

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

On 11/22/2011 1:50 PM, Dave Brown wrote:
> My solution to this problem documented here-
> http://homepages.ihug.co.nz/~tractorb/collins/Collins%2075S%20mains%20switch%20.pdf
>
> It might need some mechanical changes in the KWM-2 but you get the idea.
> In retrospect I probably should have put the whole thing under the chassis
> somewhere.
>
> 73
>   Dave
>   ZL3FJ
>
> -