On 1/31/2023 4:59 PM, K9MA wrote:
I have what appears to be very strange RFI source: it's very
broadband, covering at least the whole 20m band, but it's somehow
modulated at 1100 Hz. In AM mode, the 1100 Hz tone is audible and it,
as well as the second harmonic show up in the audio spectrum. The
tones are present wherever the radio is tuned on 20 meters. It's as if
a broadband noise source is modulated at 1100 Hz. I have heard the
tone shift frequency. Not a solar system, as it's present at night.
Any idea what this could be?
73,
Scott K9MA
Audio spectrum:
https://sdellington.us/hr/RFI/NW%2020m%20AM%2023.01.31.jpg
--
Scott K9MA
k9ma@sdellington.us
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