[Elecraft] AC hum on tune

[Karl Marderian]

Bad power supplies, check for hum from them. Ground radio and/or power  
supplies. The A/C hum has to come from the wall supply.
That's my two cents, good luck.
N6XVT 73

Sent from my iPhone

On May 16, 2010, at 8:43 AM, Sam Morgan <k5oai.sam at gmail.com> wrote:

> This one is a bit hard to describe, so please bare with me.
>
> I was talking to some locals (1-5 miles) this morning on 80m LSB.
> I was told that when I was tuning up a hum was heard on my signal
> by the guys, which were in LSB on their receivers
>
> I tried with low power 1w
> I tried with higher power 90w
> I tried it through the external amp
> I tried it with the external amp off
> I tried it direct to the antenna
> I unplugged everything from the K3 but the power and antenna
> I have switched power supplies,
> I have switched AC outlets in the room.
>
> They say they still hear the hum.
>
> I switched to cw and
> when they were still listening in LSB,
> they still heard the hum on my cw signal.
>
> IF they switch to cw on their rigs,
> they do NOT hear any hum on my cw signals.
>
> what in the world is going on here?
> do I have a problem or not?
> -- 
> GB & 73
> K5OAI
> Sam Morgan
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