[Elecraft] K2: High SWR On Dummy Load

[Don Wilhelm]

Ariel,

I would think your K2 finals are OK (for now).
My best guess is that you have a KPA100 and a static charge has damaged 
diodes D16 and D17 in the KPA100.  If you do not have the KPA100, then 
you most likely have the KAT2 and the diodes are D1 and D2 - the same 
principle applies.

To test my theory, connect an external wattmeter between the K2 and the 
antenna.  Set the power control to 2 watts and do a TUNE - what is the 
power indicated by the external wattmeter?  If it is substantially 
higher than the set power, there is something wrong with the wattmeter 
in the KPA100 (or KAT2) - replace the diodes.

Be aware that those diodes are damaged by a static charge on the 
feedline.  You should have a DC path across the feedline and the coax 
shield should be grounded.  In any case, install an antenna switch and 
switch the K2 to a dummy load when not in use.

73,
Don W3FPR

On 10/24/2012 10:18 PM, Ariel Jacala wrote:
> My. K2/100 is acting up in that it is showing high SWR even on a dummy load.  Any ideas on whether the K2 finals may be blown? It behaves the same way on all the bands.  It displays high current with the power set to 3 watts or more.  My K2 is SN7105.
>
> Will appreciate diagnostic help.
>
>