Richard:

That looks like the signature of a switching powersupply.  Are you using a
"wallwart" or other switching supply
to power your 1500?  I would start by changing power supplies.

Cheap switching supplies are notorious for emitting this kind of garbage.

--- Graham / KE9H

==

On Thu, Jul 22, 2010 at 10:53 AM, richard allen <[email protected]> wrote:

> Does anyone recognise this type of noise?
>
> http://www.rcallen.com/noise14.gif
>
> I figured I'd ask before starting to unplug everything as I have all sorts
> of possibilities in my lab.  I still hear it with a dummy load on the
> antenna of my 1500 but not as strong.
>
> Richard W5SXD
>
>
>
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