I've also had success with the MFJ-856. However, when you get close to a
strong source, it can overload and lock up. My solution was to make two
wide straps of thin aluminum with which to short out the antenna,
receiver, or both. When I'm right next to a very strong source, I can
hear it with both straps on.
The other caveat, which I've mentioned before here, is to make sure
you're hearing the same source that's causing the problem. The MFJ-856
is very sensitive, and will detect a lot of weak sources which, at least
in an urban area, are usually not the main problem.
73,
Scott K9MA
On 1/12/2021 7:25 AM, Dave Cole wrote:
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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--
Scott K9MA
k9ma@sdellington.us
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