[Elecraft] Experience with KXPA100

[Art Nienhouse]

*/Hi Hans
My kapa100 kit serial #360 is doing the same as yours I was under the 
impression that there was a refinement to the firmware that was going to 
fix this issue.

Regards
Art
ka9zap
/*
On 6/24/2014 2:11 PM, Hans J Rasmusen OZ7BQ wrote:
> Hello,
>
> My KXPA100 ser.nr. 00822 has now been on the air for several months and produced several hundred QSO's. The performance however, is mixed.
> The output power varies from one band to another with the output set on the KX3 to 110 Watts and using the KXPA100 utility for meetering and a dummy load. The antenna tuner is in manual and SWR indicated to be between 1:1 and 1:1.1 from 160 M to 10 M.
>
> The best band is 20 M, where the KXPA100 will produce 112 Watts out with 5.5 Watts driving power and an indicated power dissipation of 62 Watts.
> The worst band is 40 M where the KXPA 100 only will produce 83 watts out with 2.8 Watts drive and an indicated power dissipation of 92 Watts.
> On 80 M the KXPA100 utility shows a power dissipation of 118 Watts and an output power of 89 Watts.
> Except on 20 M no band produce more than 90 to 95 Watts output.
>
>
> I am surprised by the big variation in efficiency. Almost twice the loss on 80 M compared to 20 M. Besides there seems to be plenty of drive power, so why less than full power on most bands?
>
> Has anyone else observed similar variations?
>
> 73 OZ7BQ, Hans Jørgen (Joe)
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