>What you describe Leonard is similar to what my UPS
>does. Presumeably what you are seeing when the
>interference changes frequency is the operating
>frequency of the switchmode power supply inside the
>UPS drifting around in response to temperature and
>load variations. The fixed I described in my earlier email
>with the toroids on the line cords should be helpful to you
>as well.
Mine generates a lot of rubbish up around 2400 kHz, above 160 and just below
WWV. Sounds like a buzzsaw. Doesn't seem to get into any of the ham
bands.
Don K4KYV
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