[NCARC] Help with Interference

[Kevin]

Justin,
   Just a wild guess.  For a while, some companies sold some wireless phone
sets that operated on 2m freq.  I read about these phones, and they sold
them as having a range of several thousand feet.  Seems I remember they used
2m frequencies, were never type accepted by the FCC, and thus were illegal
and eventually pulled from the market.  These phones were causing a lot of
problems and operating at pretty high power levels.
  
   I wonder if your neighbor has one of these phones and you are getting
intermodulation with it or some similar device.  There are a number of
consumer devices that use 2m frequencies at supposedly miniscule power.  For
example, my wireless weather station uses a 2m simplex freq to send a low
power data burst once every 3 minutes.  It is barely detectable.  That sort
of device would not have the power to cause intermod.  

   I am guessing it is some intermod problem, from the sound that I heard.

Kevin WM0F

> -----Original Message-----
> From: ncarc-bounces at mailman.qth.net [mailto:ncarc-bounces at mailman.qth.net]
> On Behalf Of Justin King
> Sent: Monday, August 03, 2009 19:36 PM
> To: ncarc at mailman.qth.net
> Subject: [NCARC] Help with Interference
> 
> 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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