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Re: [RFI] From: [irca] Strange RFI

To: rfi@contesting.com
Subject: Re: [RFI] From: [irca] Strange RFI
From: "Dave (NK7Z)" <dave@nk7z.net>
Date: Tue, 14 Nov 2023 09:14:07 -0800
List-post: <mailto:rfi@contesting.com>
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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