Dear Don,
I read at the K2 13.6 V. It is a Powerwerx PS from Elecraft with the two
Powerpole connectors at the front. The Voltage drops at 100 W / 28 MHz
to 12.2 V. I already replaced D16. No change. I tried several PS.
73,
Holger DL9HDA
On 05.11.19 02:46, Don Wilhelm wrote:
Holger,
Is your power supply voltage at 13.8 volts or better yet 14.3 volts?
That should be as measured by the voltage display on the K2. It
should not drop below 12.7 volts during a 100 watt transmit.
Part of the problem may be attributed to the voltage vs. frequency
curve of KPA100 D16 - which should be a 1N5711 diode. I have seen
diodes that have become "flaky" with use, replacement with a new one
is the only cure should that be the problem.
Other than limited voltage to the KPA100 or the response curve for
D16, there is usually no other answer for the behavior you are seeing.
Remember that the power may vary by as much as 1 dB from band to band,
and at the 100 watt level is about 20 watts, so you may not have any
problem other than diode tolerance vs. frequency.
73,
Don W3FPR
On 11/4/2019 4:53 PM, Holger Doerschel wrote:
Hi,
after I finally installed the KAF2 module in my K2/100 05775, it was
time to do a complete alignment and I ran into this old problem again.
The output power at 160 m is 100 W. And drops from band to band to 80 W.
Now I have adjusted the KPA100 to 10m. Now I have there 100 W but
then on 160 m 120 W.
Measured with an LP-100A and dummy load. SWR is fine!
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