[Elecraft] KPA500 receive loss

[CUTTER DAVID]

Would a gas discharge tube save the sensitive parts?

David G3UNA


> On 05 June 2021 at 16:20 "Dr. William J. Schmidt" <bill at wjschmidt.com> wrote:
> 
> 
> This happened with my backup amp at the contest station on J6.  I left it
> connected by accident overnight (too much rum) and we had some static
> storms.  Took out the pin diodes (well, more accurately the diodes that act
> like PIN diodes).  When put in operate, the receive drops by 30+ dB but
> still transmits fine.  A simple replacement of the four diodes and three (?)
> transistors solved the problem.  Dirt cheap.  You can make these
> measurements at the test-points to confirm:
> 
> 
> TP2= RX 13.1, TX 0.8
> TP4= RX 3.9, TX 13
> 
> 
> Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ 
> 
> email:  bill at wjschmidt.com
>