"DougSlug" wrote in message
...
While tuning through the 28.3 to 28.5 MHz portion of the 10m band in USB
mode, I get what sound like carrier tones very evenly spaced every 15 kHz
starting at about 28.3 MHz.

I am using an AOR AR8600MkII receiver with an AOR SA7000 antenna mounted
on a mast outside. I am located in central NJ in the Princeton/Trenton
area.

What is the source of these tones?

Thanks,
Doug

The horizontal sweep of television sets is 15750 Hz.
Switch mode power supplies operate anywhere from
10 kHz to 100 kHz.
It is not uncommon for either of them to ring and generate
harmonics in HF.

--
rb