[RFI] New RFI

[N4ZR]

Using a Moxon antenna is another way to get a sharper null - there was 
an article in QST describing such an antenna, which I use with a 
shirt-pocket handi-talkie with 136 MHz AM aircraft band.  The null off 
the back is deep and narrow.

73, Pete N4ZR
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On 1/12/2021 1:41 PM, David Eckhardt wrote:
> Most recently, I have isolated a source on a power pole by using both the
> MFJ device AND a home brew 0.5-meter shielded loop connected to a
> battery-powered receiver tuned to the frequency of maximum RFI.  The null
> perpendicular to the loop plane is extremely sharp and, from that
> experience, I dare say sharper than the MFJ device or at least an equal.
> Another strength of the shielded loop is that you can isolate the source
> *at* the interfering frequency(ies).   Also, confirming a source with two
> entirely different technologies can be helpful in nailing the source.
> Once isolated, our power provider, PVREA (N. Colorado), had the problem
> fixed the next day and waited for us to confirm their fix.  Not all
> providers are so responsive.
>
> Dave - WØLEV
>
> On Tue, Jan 12, 2021 at 1:25 PM Dave Cole <dave at nk7z.net> 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
>>>
>>>
>>>
>>> _______________________________________________
>>> RFI mailing list
>>> RFI at contesting.com
>>> http://lists.contesting.com/mailman/listinfo/rfi
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>>
>