[Elecraft] K2/100 output power issues

[Holger Dörschel]

Hi, I tried to drive an external linear PA with my K2/100 (no tuners installed) and I have some issues with the output-Power:

I used a DIAMOND SX20C and a 50 ohms dummy-load for my measurements. I also used a Elecraft W2/2K. I think, the 2K-coupler is not the best choice but the tendency is the same.

1. I mesasured at 10.0, 50 and 100W output power at the KPA100 PL-antenna connector:

 3.500    9.5    90    110
 7.000    9.5    95    109
10.100    9.0    78     90
14.000    9.2    75     85
18.068   10.5    70     70
21.000    8.9    60     65
24.890    8.9    60     68
28.000    6.8    59     70


2. I measured at 10.0W output power with switched off KPA100 at the K2 BNC-antenna connector:

 3.500    11.0
 7.000    10.1
10.100    10.1
14.000    10.8
18.068     2.8
21.000     2.8
24.890     5.0
28.000     8.5


So I think there is a Problem with the 17-12m bands at the K2. But I think, there is also somethink wrong with the KPA100. The Output Power at 50W is to high.

Any hints?

Vy 73, Holger - DL9HDA