[Elecraft] KPA100 R 19 R20 question

[Dr. Werner Furlan]

hi Don and all who replied, 

On 23 Nov 2007 at 8:30, Don Wilhelm wrote:

> If they all look the same, they are all good.  The old inductive
> resistors had a light-blue body, the new ones have a red-brown body
> color.

yes all are brown. 

in the meantime I have nearly finished my KPA100, the only part missing is a 
housing and crimp pins for the low power supply. (I am waiting for the spare 
part) 
But  I could already try the PA without this plug, and it works, but there must 
be some problem with oscillation I think. It is only in SSB mode, not when I 
tune or send CW.
In low power mode all is ok, when I turn power over 11 Watt, the PA draws 
more than 18A when I whistle. The modulation reports I get describe it as 
missing high frequencies. When I observe the amperemeter needle, it looks 
very nervous, sometimes I have seen and heard it "vibrate".
Sometimes I have had a normal behaviour though, with 80W on my 
calibrated LP100 Wattmeter and a good signal report. But this was only a 
very short time. Most of the time I get this peaks of output up to 150 W on 
the LP100 peak meter.

I have now put the PA in the EC2 with the KAT100. For allignment and 
testing I have had it mounted besides the K2 and connected it directly.

73! de Werner
OE9FWV


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