Sounds like my Carrier A/C outdoor unit. Small spike every 19khz.
On Wed, Aug 11, 2021, 11:04 AM Pete Smith N4ZR <pete.n4zr@gmail.com> wrote:
> I don't know if the reflector will allow this image, but thought it was
> worth a try.
>
> This thing shows up periodically - happily not often. The
> periodicity makes me think switching power supply, but aren't they
> normally discrete , sometimes noisy, sometimes drifty but fairly narrow
> critters? This has a substantial 120-Hz component, but why every 19 KHz?
>
> --
> 73, Pete N4ZR
> Check out the new Reverse Beacon Network
> web server at <http://beta.reversebeacon.net>.
> For spots, please use your favorite
> "retail" DX cluster.
>
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