[Elecraft] AC hum on tune

[Sam Morgan]

On 5/16/2010 11:22 AM, Dale Putnam wrote:
> Hey Sam,
> Good Morning, what may be happening, is your power supply has an
> excessive amount of hum, or filtering has degraded. Why they may not
> hear the hum when they use cw, is that their receivers cut off the hum
> because the cw filtering doesn't usually listen that low. If you have
> another supply, changing to it may have a significant impact.
 >
I just went to battery power and hear the same hum

I have turned on a radio shack swl receiver sitting across the room
and am using 0.10w output
into the same antenna (dipole 24 ft up on roof)
So now I hearing what I think they were talking about
it's not exactly what I would call an 60 cycle ac hum
but it does modulate the tune signal at a low frequency rate

Ok  including what should answer others posts as well.
the only other ac field near by is a computer switching supply about a foot 
below, I don't think switching supplies create the kind of fields we are talking 
about in other posts?

-- 
GB & 73
K5OAI
Sam Morgan