[Elecraft] K2/100 problem on 80 meters

[Don Wilhelm]

Pierre,

That strongly suggests that your KPA100 has a parasitic.
If your KPA100 is of recent vintage (less than 2 years old), it should 
be quite stable.
But, if you have added the KPA100UPKT, I must ask if your upgrade kit 
included a new C31 capacitor of 0.22 uF value.  Many KPA100UPKT kits did 
not include this capacitor until recently.  If this situation fits your 
case, send an email to parts at elecraft.com asking for a new capacitor for 
C31.

If your KPA100 is of the older T/R switch design - red cores for L15 and 
L16, then I would suggest that adding the KPA100UPKT would solve your 
problem.  The current KPA100UPKT includes the new capacitor for C31.

73,
Don W3FPR

Pierre wrote:
> Well I spoke about the SWR meter on my MFJ-949E. If I send CW, when I 
> release the key, the reflected power needle goes up wildly.. sign of a 
> high SWR... even at 11 watts.
>  
> But that same needle stay at 0 W for a 10 Watts transmission...
>