[RFI] RFI Source

[Dave (NK7Z)]

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
>