[RFI] RF - Noise

w4lde w4lde at numail.org
Wed Nov 19 11:46:31 EST 2008


Thank you for the help, I have confirmed that it's RFI noise #1, #3 and 
at times it sounds like #4, the two noises.
This is going to great for discussions with the power company.  I was 
amazed that they really wanted to help cure the problem
as compared to other Op's experience's as posted to the reflector.

So far the noise has abated except for occasional bursts.  I could live 
with that but the steady state is a real pain in the ---.

I am keeping a log each day with time, WX condx and frequency's (Mhz), 
signal levels and noise conditions.

After two days the noise has returned on 40M and its intermittent while 
nothing is being heard on 20M like it did before which indicates to me 
that the source is a little further away than I first thought.  Going to 
take the sniffer out after lunch and see where I hear it on 139Mhz and 
then 339Mhz AM.  The power Company uses 331Mhz and I don't think that 
they can hear it unless there right on top of it.

I believe I have two different sources since using a phase noise 
canceling MFJ unit the phase relation is different for each type of noise.

Will keep the list posted on what I am finding and the response by the 
Power company.

Thanks for the input.

73 - Ron W4LDE

Michael Martin wrote:
> Well Ron,
> I think you found the correct tread for your situation.
> Let's assume the noise source is the utility hardware, it's common for
> noises to start with work being done on the utilities equipment and just as
> common for it to stop once the work is finished. The work causes the pole
> hardware to get shaken up and moved from its normal resting position. Once
> the work is stopped (for the day) the hardware returns to rest and the
> noises usually stop. When the work starts again so can the noise. While the
> work is under way the system is reacting like it's a windy day.
> Now for the bad news, sometimes the noise sources don't stop and sometimes
> they become intermittent sources. The remedy is to give them a couple days
> and if they persist call your local power company. Tell them that the recent
> work has created a noise on your radio equipment.
> Check out my web site noise page http://www.rfiservices.com/sound.htm . If
> your noise sounds like one of the recordings (RFI #1 - #5) Have them visit
> the page and tell them this is where you confirmed your suspect.
> If your noise isn't constant make sure they know the time pattern of the
> noise.
> Last but not least, keep the readers informed of your progress and best
> wishes.
> Mike Martin
> RFI Services
> 6469 Old Solomons Island Rd
> Tracys Landing, Md 20779
> rfiservices.com
> 240-508-3760

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