[Elecraft] KPA500 clicking

[Don Wilhelm]

Wes,

The KPA500 T/R switching is all electronic, so no reed relays are involved.

Are you certain the clicking noise is coming from the KPA500?  There may 
be some audio from the speaker/headphones from the K3 when returning to 
receive.  QSK OLD vs. QSK NEW might change the behavior unless it is 
truly coming from the KPA500 (which would likely indicate some 
mechanical effect - likely due to heating).

The fact that you hear it in TX TEST mode indicates that it is not a 
heating problem, but check closely to determine if it is actually in the 
K3 audio on a return to RX from TX condition.

73,
Don W3FPR


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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