I have seen something like that here as well... You will need to gather
a lot more info, and do some hunting...
See:
https://www.nk7z.net/sdr-rfi-survey-p1/
This will help you define the schedule the RFI keeps...
I suspect what I am seeing, is a variable duty cycle fan... No reason
to suspect this other than a guess at it...
The RFI I see, seems to be related to outside temperature... During 70
to 75 degree weather, I almost never see it. The colder, or hotter it
gets the more I see it. It also changes activity at night...
All of this is fun, but does not locate the RFI... It's loop and radio
time...
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 11/14/23 08:55, Facility 406 wrote:
Received the following message through another forum this morning.
Peculiar RFI I've not seen, or heard before.
Ideas?
Original poster email address is:
mark@spacetubes.com
Original message below:
Wondering if anyone has seen any RFI that looks like this.
https://spacetubes.com/DX/Digital.RFI.Lower.AM.Band.Start--2023.Nov.14--sdkaz--perseus.mp4
https://spacetubes.com/DX/Digital.RFI.Lower.AM.Band.End--2023.Nov.14--sdkaz--perseus.mp4
The first link shows it starting up, then it goes like that for a while
(sometimes a long time - half an hour or more), then it ends like what's
shown in the second link,
Then it can be quiet for a random amount of time, before it starts up
again.
Mark Pettifor
Goshen, IN -- en71ao
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