[NLRS] 6m and up noise

[Jevon (Jon) Lieberg]

Hi;

Take a look at this site, It might be of some help identifying the 
source of your noise.

Noise Identification web site by VE3HLS:

http://ve3hls.tripod.com/noise/rfihome.html

Listen to the audio samples to identify
any noise sources you might be experiencing,
or help others identify unknown noises.

73
Jon, K0FQA


Chris Elmquist wrote:
> 
> On Tuesday (02/28/2006 at 07:31PM -0600), John Oehlenschlager wrote:
>> >From "UP NORTH" in EN26oo I see a very strong noise increase when pointed 
>> directly at the Twin Cities.  On 6M the noise is typically 2 S-units above 
>> the ambient when pointed other directions.  On 2M it is about an S-unit 
>> higher.  Don't seem to see any significant noise on 222 or 432.  So much 
>> for a quiet spectrum!   K0JO 
> 
> One noise issue we have battled for years is at the Shoreview towers
> and has to do with the elevator cables arcing between each other and
> the tower structure when they blow in the wind.
> 
> This not a continuous noise floor increase but instead a crackling,
> periodic noise burst like you would expect from an arc.  When the wind
> is up around Shoreview, I can get S9 to 10 or 20 dB over S9 noise bursts
> on 2m from this situation.  The noise blanker in my FT736 will knock it
> down somewhat but not completely.
> 
> The cables arc because they are so hot with RF where they run past the FM
> broadcast antennas part way down from the top of the tower.  It became
> more of a problem when the tower owners stopped parking the elevator
> some distance up the tower and instead now keep it on the ground... as
> I understand it.
> 
> I once discussed the issue with the engineer in charge at KMSP, which
> owns the tower, and he said they would investigate if we were able to
> produce spectragrams of the noise in action.  I don't think anything
> has been done past that point.
> 
> I also don't think they are licensed for spark gap transmitter operation
> with a 1500' vertical antenna... in any case.
> 
> I am not sure if this is the noise you are hearing.  I know there are
> other issues with the TV channel 2 transmitter that goes back years
> to when they upgraded to a Harris transmitter from whatever they used
> to have.  I know some folks here in the Cities worked that issue pretty
> hard when the transmitter went online but I think it ended when someone
> ruled that it was in compliance and the hams were too "sensitive".
> 
> Chris N0JCF
>