Re: [AFMUG] Your a strange one, Mister Grinch

[Bill Prince]

or someone has a nearby transmitter that is turned up well beyond what might be needed. I'm inclined to agree with Jaime's theory.

bp
<part15sbs{at}gmail{dot}com>

On 2/19/2020 8:40 AM, Ken Hohhof wrote:

I was trying to convince myself it could be some weather or military radar that does a 360 degree sweep every 4 minutes, and that PIM was creating a difference frequency of 950 MHz.  But your explanation makes more sense.  In which case somebody has an OOBE problem or is not on their assigned frequency, or maybe the STL needs a narrow bandpass filter on their receiver.  Like WISPs used to put on their 900 MHz equipment when located near a paging tower.

 

 

From: AF <af-boun...@af.afmug.com> On Behalf Of Jaime Solorza
Sent: Wednesday, February 19, 2020 10:33 AM
To: AnimalFarm Microwave Users Group <af@af.afmug.com>
Subject: Re: [AFMUG] Your a strange one, Mister Grinch

 

Suspect it's a utility because of intervals associated with polling. The water utilities has over 800 well and lift stations working at 928.xxx and 952.xxxMHz ...you can actually hear them polling on a scanner!  

 

On Wed, Feb 19, 2020, 9:18 AM Bill Prince <part15...@gmail.com> wrote:

and 900 MHz is not all that directional; a signal strong enough to overload will be difficult to find a direction on.

bp
<part15sbs{at}gmail{dot}com>
 

On 2/19/2020 8:05 AM, Ken Hohhof wrote:

Good luck.  I hate trying to locate interference sources.  If it only occurs for 1-2 seconds once every 4 minutes, that will be even more difficult.

 

Maybe at least you can determine what frequency and channel width it is using, and the signal level.  To figure out if it is on the exact same frequency, or maybe an adjacent channel but so strong it is overloading the receiver front end.  I know there are some high powered paging systems around 930 MHz, not sure what would be up at 950.

 

Is the STL analog or digital?  And is it like a backhaul link with tons of fade margin, or could a relatively modest signal interfere with it?

 

From: AF <af-boun...@af.afmug.com> On Behalf Of Jaime Solorza
Sent: Wednesday, February 19, 2020 9:46 AM
To: AnimalFarm Microwave Users Group <af@af.afmug.com>
Subject: Re: [AFMUG] Your a strange one, Mister Grinch

 

Will see what I can find today and tomorrow...

 

On Wed, Feb 19, 2020, 5:08 AM Lewis Bergman <lewis.berg...@gmail.com> wrote:

Electric Utilities are pretty constant in my experience. If it is licensed, you can call the FCC. They have the best equipment for finding interfering signals. 

 

On Tue, Feb 18, 2020 at 10:08 PM Jaime Solorza <losguyswirel...@gmail.com> wrote:

Just got a late evening call to help find a possible interference issue on a licensed STL working at  950MHz that gets "interrupted" every four minutes for a second or so since last Thursday....radio technician replaced STL and same issue...no BERs detected.  Going to visit sites tomorrow..

The FM frequency is 97.5 MHz and transmitter checks out as well as antenna and waveguide.

I do know 895-900MHz is getting hosed from across border as well as Verizon's PCS bands from new provider across border.  Going to take SA up the mountain and see what it shows ..

The four minute interval intrigues me...as in SCADA system polling...the utilities do use nearby frequencies...any ideas from my fine feathered friends welcomed...

Goodnight, Jaime Solorza

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