Ooops. The power supply is from Cisco Systems p/n 34-0912-02 Rev A0
(5V 2.5A) supposedly replacement power supplies for Bay Network hubs.
Looks like it was made by Delta Electronics & has an inline bullet
filter about an inch from the 2.5mm? connector.
A local ham told me that he has a large 5V non-switching power supply
that I can try in its place. That will at least eliminate the power
supply. I'll let everyone know this wknd if it works.
Gary - WB4SQ
--- jduerbusch@charter.net wrote:
> Gary, can you tell us which switching power supply you had the
> trouble with??
>
> Joe K0BX
>
>
> Its those @##$! switching power supplies. You can try shielding it
> AND
> running ferrite beads. I'm going to try a non-switching supply out
> and
> will let you know.
>
> Gary McConville - WB4SQ
>
>
> --- Jerry Pixton <jpixton@shentel.net> wrote:
>
> > All who responded,
> >
> > I found my noise generator. Something many of us have in the shack.
> > The
> > network hubs!
> >
> > I have two local area networks for the house/shack. One internal
> for
> > sharing between computers and one external for access, through DSL
> > modem,
> > to the internet. Firewalls between in DMZ style. Both hubs,
> > Linksys/Cisco
> > are generating about a 60 Khz noise (from some sort of switching
> > power
> > supply?) and are just slightly out of frequency with each other;
> thus
> > two
> > tones.
> >
> > I have been using these hubs for over two years in the other house
> > and
> > never suspected any noise from them. But I had good outside
> antennas,
> > not
> > some dipoles laying here on the floor.
> >
> > Now to figure out what to do about the noise? Get different hubs?
> Get
> > Cisco
> > to replace them? Has anyone else had problems with the Linksys
> hubs?
> >
> > Now that I at least know what is causing the noise, I can get back
> to
> >
> > wiring the station, HI
> >
> > Jerry, W6IHG
> > ------------------------------------------
> > Dr. Jerry R. Pixton, PIXOS Designs LLC
> > http://www.pixos.com/designs/RadioTuner/
> > jpixton@shentel.net
> > ------------------------------------------
> >
> >
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> >
>
>
>
>
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