[NCARC] Help with Interference

[SCOMIND at aol.com]

Hi Justin,
 
A guess...
 
Since the frequency is moving, it could be a mast-mounted TV antenna  
preamplifier. Sometimes it's installed with the output cable too close to  the 
input terminals, turning it into an unstable oscillator that  sweeps up and 
down a band of frequencies with temperature.
 
73,
Bob
 
 
In a message dated 8/3/2009 7:36:15 P.M. Mountain Daylight Time,  
n0aol at nti-llc.net writes:

Hello  all;



Some of you will get this twice as I am sending this to  both the NCARC list
and the ARES D-10 group for help.  I am having a  great deal of difficulty
with some 2 meter FM interference in my  neighborhood.  I have narrowed it
down to one or two cul-de-sacs in  the neighborhood about 200 to 300 yards
from the house.  I have made  circles around the noise source so I'm pretty
confident of its approximate  whereabouts



This problem has been going on for months now and  has slowly been getting
worse.  Why it is on FM is beyond me.I would  expect HF to be affected by
this and it is not.



I have two  audio clips on my website in wave format if you are willing to
take a  listen.  Mike, N7DQ, was helping me find the general vicinity of  
the
audio source this evening.  The files are located  at
http://n0aol.nti-llc.net/interference/.  I have a clip from this  morning
when we were on 146.550 simplex (which we then changed to a quiet  147.510)
and then the PM recording is from 147.475 simplex which has an S4  reading
when it hits on the base radio.  Note that 146.550 is silent  right
now.unlike this morning.



The signal changed  frequencies from morning to PM, and it went up in
frequency, maybe has  something to do with the morning dew on everything 
from
how humid it has  been lately and then drying out later in the day??



I am stuck.I  don't know where to go from here.  I don't think I can report
anything  to any kind of "officials" as I don't know what the noise source
is.if  someone can identify the pulsing and can tell me what to look for in
terms  of faulting equipment I would be ever so appreciative and  grateful.



Thank you very much!

Justin  King

N0AOL

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