[Elecraft] [QRO] KPA500 PIN diodes / High SWR

[W5UXH]

Hi Eric,

That is what I hoped to hear.  I also had a response off list from a
dedicated tester who "tested" this.  It is good to know there is a good
chance of surviving an occasional oops.

73,

Chuck, W5UXH


Eric Swartz - WA6HHQ, Elecraft wrote:
> 
> Hi Chuck,
> 
> We immediately protect the amp by going into bypass mode. The 
> microprocessor detects the extreme SWR event and immediately routes the 
> drive signal around the amp, initially though the diodes, and then 
> through the bypass relay after it has switched. This happens in a few 
> milliseconds.
> 
> While I do not recommend this as a normal operation test, we even have 
> pulled the coax out of the dummy load at 500W during tx to test this, 
> with no ill effects. (If you were at our contest university demo in 
> Italy, you may know how I know this..  ;-)
> 
> We have not been able to kill the t/r diodes during lab destructive 
> testing or in on-air operation.
> 
> 73, Eric  WA6HHQ
> 


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