His,
Is it on other frequencies, or just 20?
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 1/31/23 14:59, 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
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