Topband: noise

[K9AY]

> "...sounds like a unstable data transmission of sorts and it appears every
> 36 khz through the band starting at 1812 repeating at 1848, 1884, etc...
>
> "Thanks, de gary, kd9sv"
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> That one might be a switching power supply.
> Brad, KV5V
>
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Or a CRT monitor if the frequency is stable, although a switching supply is 
#1 on my list, too. Don't forget the switching supplies in energy-saving 
lights.

And you can occasionally get birdies from linear power supplies -- I had 
this happen with an old Pyramid supply. Changing the regulator IC fixed it.

Gary
K9AY