[Elecraft] K2 proximity to power supply

Mon Nov 17 15:13:00 2003

It's an Alinco DM-330MV.  Sometimes I hear a very weak warbly signal
emanating from the supply on 160 meters.  There's a "noise offset" knob that
can be used to tweak whatever is oscillating in the supply, thus moving the
signal somewhere else.  Never heard any other noise on any band, and I'm
often lisltening down in the mud on the lower bands.  The BC band is a
different story.  Quite a few spurious signals from the supply down there.

K8AC
----- Original Message ----- 
From: "David Toepfer" <[email protected]>
To: "Floyd Sense" <[email protected]>; "Elecraft"
<[email protected]>
Sent: Monday, November 17, 2003 1:38 PM
Subject: Re: [Elecraft] K2 proximity to power supply

> Which switching supply do you use?
>
> dt
> .
>
> --- Floyd Sense <[email protected]> wrote:
> > When I first got my K2 (a few weeks back), I discovered the problem that
can
> > be caused by proximity to the AC supply (in my case, Astron RS-30M) when
I
> > noted a rough CW note on received stations.  I moved the supply about 18
> > inches away from the K2 and considered my problem solved.  Received CW
> > sounded pure, and there was no trace of hum on my CW signal.  This
weekend,
> > I played around for a short time in the SS, and immediately got a couple
of
> > reports of "rough audio".  When I listened on my other transceiver, sure
> > enough there was the AC hum on my SSB signal.  I reverted to the
switching
> > supply and all was well.  I'm not sure just how far away from the K2 you
> > have to get a supply like the Astron in order to eliminate the hum, but
it's
> > sure more than 18-20 inches.  Once the hum problem was gone, I began
getting
> > "beautiful signal" reports again.
> >
> > 73, Floyd - K8AC
> >
> >
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