[Elecraft] k2 + kpa100/kat100 Power problem

[Don Wilhelm]

David,

The wattmeter in the KPA100 is not signaling the output power back to 
the base K2 microprocessor.  The most common cause is damaged diodes in 
the wattmeter.  To assure yourself that this is the case, remove the 
KPA100 and run only the base K2 - if the base K2 can control power 
properly, the problem is in the KPA100.

Check diodes D16 and D17 in the KPA100, and while you are at it, you may 
as well get 4 of the 2N5711 diodes and replace the 2 in the KAT100 as 
well.  Then for the future, make resolve to disconnect the antennas when 
not in use.  The most probable cause of failure is a surge from 
lightning or even rain/snow/wind static that caused the diodes to be 
damaged.

There are a few other possible causes of that kind of failure, but check 
the diodes first, and if the diodes are good, ask again and we can guide 
you to the real failure spot.

73,
Don W3FPR

DAVID Nachbaur wrote:
> Hello all I have  the K2 with the KPA100/KAT100 in an EC2 case and running that configuration. I get full power out of the unit on all bands but anything above the 10 watts is automatic 100 watts. there is now in between The display does show any setting that I want. for example I can dial up 50 watts. but it will be 100 watts or 30 watts  I still have 100 watts as I scale up throught the range of the power control. Any suggestions where I should start. I did check my cables and all seems to be ok I have it running through my logging program ok. So frequency and mode control are working ok.
>
> Thanks
>
> David KR4OW
>   
>