I found both a problem and a solution. I'm posting this in hopes someone else can benefit from my experience.
During last night's Spartan Sprint I got a report from a friend that my CW signal was 597 with poor tone. He said it had an AC
power sound.
I listened with a second receiver and confirmed a rough note. I:
- disconnected the AC power supply and substituted a battery. No joy.
- disconnected the RS232 cable from the K2. No joy.
- the KPA100 was off, but I took it out altogether. No joy.
After checking the Elecraft archives, I came across a posting from Michael AB9GV:
"Make sure that the K2 is not close (within a foot?) to stray magnetic fields from battery chargers, power supplies, lamp ballasts,
and so on."
Turned out I have an older high intensity light within 6 inches from the side of the K2. Turning off the lamp cured the problem.
73 de K1ESE
John
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