[Elecraft] FW: KPA-500 Switch from STBY to OPER

[Dr. William J. Schmidt]

If you notice a drop in signal strength when simply switching the amplifier
from "Standby" to "Operate", it means that the T/R diodes are biased for
transmit (not receive).  Check R7 the 51 ohm SMD resistor on the daughter
board as the most likely failure.  It has happened to me and several others
on the reflector.


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ 

Moderator – North American QRO Group at Groups.IO.

email:  bill at wjschmidt.com



-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Wilhelm
Sent: Monday, February 10, 2020 6:00 PM
To: Bill Weaver <weaverwf at usermail.com>; afpacker at gmail.com
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] KPA-500 Switch from STBY to OPER

Bill,

No relays in the T/R switching path for the KPA500 - all solid state
switching.

73,
Don W3FPR

On 2/10/2020 6:39 PM, Bill Weaver wrote:
> If there is a relay in the rx signal path, check the contacts. I had that
happen with my Alpha recently. Of all the possibilities that was the easiest
thing to fix. Thankfully that was the problem :-).
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