[ADXA] Video - RFI

[Jay Bromley]

Hi,
Just curious as to what was the signal level was on your S-meter?  

The reason I am asking, I had 40 over S9 signal from powerline interference
on 6 m and the problem was over 1/4 mile away!  Finally with K5VR's help and
his trusty Yaesu HT, with VHF AM mode, we not only traced the problem down
for the power company, but showed them where the problem was!  

After 3 years of putting up with the noise, they fixed it the next day!  

More info.  There could be more than one problem!  Something this strong
could have more broke hardware underneath the main noise culprit!  So expect
to call them more than once to fix all the problems.

Here are some things I would do.

1.  Keep a log on who you talk to, note the date and also when they came out
to trace down the problem.
2. Be kind and patience with who you talk to.  This goes a long way in
eventually fixing the problem!
3.  If you have a scope, terminate the speaker output while feeding the
scope's input and take a picture of the signature.  Show this to engineer
assigned to fix the problem.  BTW, this seem to get my power company into
the "fix it" mode more than anything else!  You can measure the frequency of
that pulse and that will confirm for sure the noise is powerline
interference.  My thanks to Mark K5OO for that suggestion and his help!  

If your scope doesn't have a frequency counter built in you can measure the
time and then invert the time into frequency. Please see attached file of
what mine looked like on a typical dual trace scope.  Most powerline
engineers have seen this waveform many times before and be at the right
frequency within a few hertz or so.  

>From listening to your MP4 there is no doubt in my mind it is nasty power
line interference.  If the noisy powerline is parallel to your beam, it can
propagate unreal amount of distance!  

Good luck and 73 de w5jay/jay..

-----Original Message-----
From: adxa-bounces at mailman.qth.net <adxa-bounces at mailman.qth.net> On Behalf
Of Crownhaven
Sent: Tuesday, May 5, 2020 2:38 PM
To: ADXA at mailman.qth.net
Subject: [ADXA] Video - RFI

Guys, any thoughts?

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