[Elecraft] KPA500 clicking

[Joe Hutchens AJ8MH-Radio]

I have clicking, but it doesn't following the keying.  (Maybe you meant 
AFTER keying.)  It happens after a long transmission...for the most 
part.  It has to do with flexing of the heatsink or other parts of the 
chassis when the unit heats and cools.  I believe it's been covered here 
before.

Joe ( AJ8MH )
http://webpages.charter.net/aj8mh-radio/

On 12/29/2014 4:58 PM, Wes (N7WS) wrote:
> I'm a relatively new owner of a KPA500.  I'm also, thanks to the new 
> K3 firmware, using QSK for the first time in my ham career.
>
> These two facts have led to me hearing a slight clicking noise 
> emanating from the amp that follows the keying. This is unrelated to 
> drive or output power, since it happens in the TX Test mode too.  I 
> understand that PIN diodes are used for RF switching but it still 
> sounds like a reed relay to me.
>
> Any explanation?  (Hint) Having a schematic would probably make this 
> self explanatory.
>
> Wes  N7WS
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