[Elecraft] "worse carrier rejection" when KPA100 active?

[dl0tuh]

Don, thanks for your reply!

I repeated my tests with a 12V 7Ah battery connected to KPA100 power
terminals as the only power supply of K2. And, to eliminate 2tone
complexity, I only used single 1900 Hz tone.

Unfortunately for me, there is no change compared to 20A PSU used yesterday.
10 watts are ufb (photo 3), but 11 watts signal looks much like an AM signal
(photo 4). The frequency of the envelope on photo 4 is the tone frequency
(well, may be +- 50 or 100 Hz), I tried changing it.

(3) http://www.mydarc.de/dl2ipu/kpa100/one_tone_10_watt.jpg
(4) http://www.mydarc.de/dl2ipu/kpa100/one_tone_11_watt.jpg

I'm not expecting 50 Hz buzz from my sound card, that one I would see at 10
watts, too. Neither I'm expecting any ripple from a battery. Out of ideas by
now...

73! Oleg

P.S. Remember photo-effect of power transistors of KPA100, producing abt
0.2V where 0V should be during DC checks? I have a very strong light above
my table, hi
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