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Re: [RFI] New RFI

To: rfi@contesting.com
Subject: Re: [RFI] New RFI
From: Dave Cole <dave@nk7z.net>
Date: Tue, 12 Jan 2021 05:25:26 -0800
List-post: <mailto:rfi@contesting.com>
Hello,

I have some RFI location information at:

https://www.nk7z.net/i-have-rfi-now-what-locating-it/

I use the MFJ-856, (https://mfjenterprises.com/products/mfj-856), when looking for VHF RFI. It will pinpoint an RFI source and in most cases you can tell which part of the house the RFI is coming from, if you are on the sidewalk in front of the home.

Your RFI could be anything, is it on a schedule, does it change strength, lots of questions to answer first.

IDing via signature can sometimes work, (not too often), but nothing has worked for me better than getting out on foot and looking for the RFI source.

Once you have it located that is another entirely different matter.

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 1/11/21 8:45 PM, RALPH GRANCHELLI wrote:
Hello inteference investigators,

I have new RFI issue that started about a week ago.

I have eliminated the house /  items as a source.

Killed all breakers, ran the XCRV from batt. No change. Disconnected ext antenna, used in house antenna and no noise. So noise coming in from ext antenna.

The RFI is strongest on 80 meters however it is present up to vhf with diminished magnitude.

I took a screen shot of it on the spectrum scope.

Does anyone recognize the signature?

https://www.youtube.com/watch?v=uOdzw2ev5eE <https://www.youtube.com/watch?v=uOdzw2ev5eE> <https://www.youtube.com/watch?v=uOdzw2ev5eE <https://www.youtube.com/watch?v=uOdzw2ev5eE>>
TNX & Rgds,

N6XLQ



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