I am fluent in typo!
________________________________
From: Michael Martin, RFI Services <mike@rfiservices.com>
Sent: Friday, April 17, 2020 7:42 AM
To: Hare, Ed W1RFI <w1rfi@arrl.org>
Cc: AA5CT via RFI <rfi@contesting.com>
Subject: Re: [RFI] Power Line Noise
Input!
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Michael Martin
240-508-3760
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On Apr 17, 2020, at 6:49 AM, "Michael Martin, RFI Services"
<mike@rfiservices.com<mailto:mike@rfiservices.com>> wrote:
Thanks Ed your in foot is extremely valuable
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Michael Martin
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On Apr 17, 2020, 1:07 AM, at 1:07 AM, "Hare, Ed W1RFI" <w1rfi@arrl.org> wrote:
This is a key point, Mike. Many noise sources that might be very
strong when you are right on top of them are not heard at all at the
amateur station. This is why the signature method is the only really
efficient way to identify the actual soure of an interference problem.
Some hams get in their cars, drive around and find noise sources and
assume that they are all causing them part of their inferference. This
is not usually the case. Others truly do go on a crusade, feeling that
if they force the utility to fix all the noise on their system, their
noise environment will be quieter. Some mistakenly think that any
noise source they can hear 3 feet away under a pole is breaking FCC
rules and so must be fixed. All of these premises are flawed.
There is one very big risk in finding dozens of noise sources and
demanding that the utility fix them all. The utlity may fix a few of
them, if they aren't the one(s) you are hearing, they will often
conclude that you are never going to be satisfied, so they may stop
working on your case. If your case then gets to the FCC, the utility
will defend itself and say that it fixed noise sources, but you still
have interference, so it must be from a non-utility source (and, if you
don't have signature confirmation, that could very well be the case.)
FCC rules do not require them to fix every noise source. The rules set
NO specific limits on indidential emitters, but only require that noise
sources be corrected if they are causing harmful interference to
licensed radio users.
The bottom line is that it is important that the correct source(s) be
identified and that you only ask the utlity to fix noises that are
actually the one(s) causing interference. Any other approach runs the
risk of getting your case into an attorney letter-writing campaign that
the FCC may well accept, making it all the harder for you to re-prove
your case again and again.
Ed, W1RFI
________________________________
From: RFI <rfi-bounces+w1rfi=arrl.org<http://arrl.org>@contesting.com> on
behalf of
Michael Martin, RFI Services <mike@rfiservices.com>
Sent: Thursday, April 16, 2020 6:25 PM
To: K9MA <k9ma@sdellington.us>
Cc: AA5CT via RFI <rfi@contesting.com>
Subject: Re: [RFI] Power Line Noise
Another observation I'd like to share.
I commonly find powerline noise sources on poles in front of ham's
homes that are very high in level but have no effect on their HF
reception.
Often I find from the ham to the source as many as 10 to 15 power line
noise sources before I get to the one that's affecting the ham.
RFI Services
Michael Martin
240-508-3760
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On Apr 16, 2020, 6:16 PM, at 6:16 PM, K9MA <k9ma@sdellington.us> wrote:
On 4/16/2020 17:02, AA5CT wrote:
re: "I went out today to track down a noise source, which on the
HF bands appears to be coming from the east. "
Scott, I give you even money odds that you found ANOTHER noise
source on VHF, and not the one that was affecting you on HF (unless
you already got it fixed, and that was it, in which case I lose hi
hi).
I doubt it. This source is just too incredibly loud at 135 MHz and
close
(maybe 300 feet from the antenna) that it can't possibly NOT be
causing
HF interference. I agree with your point, though. When tracking at
VHF,
I always hear lots of sources that are not the one causing the HF
problem. I deal with that by relaying the noise from the HF receiver
at
home so that I can hear it while I'm out tracking. There is always a
pattern to the fluctuations. When I find that they match, I know I've
got the right source. This is the same principle as taking the "noise
signature", without the expensive equipment. It has served me well.
I didn't bother this time because the source is so ridiculously strong
on VHF right out my front door.
73,
Scott K9MA
--
Scott K9MA
k9ma@sdellington.us
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