[RFI] RFI Source

[Dave (NK7Z)]

Wow...  That's an odd one, looks like it is time to get out the loop, 
and portable SDR...  If you discover what it is, please let me know...

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 15:38, K9MA wrote:
> It appears to be only on 20.
> 
> 73,
> Scott K9MA
> 
> On 1/31/2023 5:20 PM, Dave (NK7Z) wrote:
>> 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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> 
>