Re: KPA500 suddenly low output - only 30 watts

Posted by Rick WA6NHC on Mar 15, 2015; 11:11pm
URL: http://elecraft.85.s1.nabble.com/KPA500-suddenly-low-output-only-30-watts-tp7600292p7600314.html

Some of those connectors can be a bit finicky, wanting to be snugged up
a little more than common.

Ask me how I know...  wiggle, snug, wiggle snug.

Rick NHC

On 3/15/2015 4:04 PM, Jack Brindle wrote:

> Mike;
>
> It is definitely a cable problem. If the asterisk is not being displayed on key-down, then the
> amplifier is not going to go into transmit. recheck the cables all the way from the K3 to the KPA
> to see what came undone. Find and fix that and the KPA will come back to life.
>
> You might want to ohm out the AUX cable going to the KPA to make sure everything is OK,
> also, look for bent pins. The PTT signal is on pin 10 of the AUX cable, as described on page 18
> of the KPA500 Operating manual.
>
> Let us know what you find!
>
> 73,
>
> - Jack B, W6FB
>
>
>> On Mar 15, 2015, at 3:46 PM, mike <[hidden email]> wrote:
>>
>> No, the asterisk on the KPA is missing. Nothing appears on the left of the
>> KPA LCD. I understand that to mean the KPA is not receiving a valid PA KEY
>> signal. I am using Elecrfat supplied AUX cables from the K3 to the KAT500
>> and another one from the KAT500 to the KPA.
>>
>> I did recently change my antennas to the KAT500, removing the one that I had
>> going to terminal 3. So in case there was a problem with the KAT500,  I just
>> tested going from the KPA RF output directly to an antenna (removing the
>> KAT500 from the circuit.) I also changed the AUX cable to go from the K3
>> directly to the KPA instead of going from the K3 to the KAT500 to the KPA as
>> it is normally wired here. No change noted.  73 ..mike AI6II
>>
>>
>>
>> --
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