[Elecraft] KPA100

[Tom.Koeken]

Hi Peter

I'll answer in English as it is the more common language for the reflector.

You wrote that you are in the setup/test /tuning phase of the KPA100 and 
somehow have a problem with the LowPassFilter in the QRP mode. To your 
opinion the inductors (toroids) and capacitors are correctly installed.

Can you describe in more detail the nature of the problem, and what you 
meant by QRP-mode?
Does it occur with power setting below 10 Watts? (in that case the 
KPA100 acts as an lowpassfilter and SWR/measurement; you might check the 
soldering of the pins from the realis K1 and K2).
Does it occur with power medium power setting (11W or more)? (in that 
case the full circuit of the KPA100 will be used).

NB In my K2 I switched some dark grey and black cores in the filter 
section. In the basic K2 the result was low power on some bands.  
Rewinding and reinstalling the toroids fixed my problem.
A mix up of the cores in the KPA100 at medium power level could result 
in higher output from the actual PA to reach the medium level after the 
low pass filter. In other words you might see the desired output at the 
antenna connector but with a combination of unneeded drive/gain in K2 
and PA plus attenuation in the lowpassfilter of the KPA100.

73 Tom PC5D
Sittard JO21WA
K2/100 SN 2709

Peter Boereboom schreef:
> Hallo,
>
> Ik ben op dit moment bezig met het afregelen van de KPA100.
> Het gaat ergens mis met het laag doorlaatfilter in QRP mode.
> Volgens mij zitten de juiste spoeltjes en C'tjes op de juiste plaats. 
> ...
> Peter Boereboom                PA1PB
>
>
>  
>
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