- Jim W5ZIT
--- On Wed, 10/28/09, Mike Besemer (WM4B) mwbese...@cox.net wrote:
From: Mike Besemer (WM4B) mwbese...@cox.net
Subject: RE: [Repeater-Builder] Pager Interference to 2-meter VHF Public
Service Band
To: Repeater-Builder@yahoogroups.com
Date: Wednesday, October 28, 2009, 7:03 PM
Subject: Re: [Repeater-Builder] Pager Interference to 2-meter VHF Public
Service Band
Hello Mike.
The first clue is that the signal is moving up and down the 2 meter
band. This would tell me that something not frequency controlled is
causing the interference. Not frequency controlled would
...@yahoogroups.com] On Behalf Of MCH
Sent: Wednesday, October 28, 2009 11:51 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Pager Interference to 2-meter VHF Public
Service Band
I have to wonder how he can say his stuff is clean when this just
started a couple weeks ago. Did he
A while back in time, I worked 20 miles south of Chapel Hill, NC.
During the late morning and afternoon our vhf fire, low band EM, and a
UHF carrier squelch sheriff mutual aid channels starting getting garbage
that was noisy but occurred on the various channels from 47 mhs to 453 mhz.
A
This sounds like a problem I traced about 20 years ago on a VHF
paging system. The PA was tube and there was some issue the tech had
with the PA not firing on rf drive .. so he locked the PTT to the PA
on all the time and then just turned the exciter on and offThe
problem was the PA was
Mike-
On Thu, 29 Oct 2009 05:33:10 -0500, Mike Besemer (WM4B)
mwbese...@cox.net wrote:
I was told (caveat) that he verified the spectrum after the interference
started. Since he's investing quite a bit of time into helping clear
this
up, I have to believe he's done that.
A
Mike Besemer (WM4B) wrote:
Joe,
The problem isn’t traffic dependant (10 am being a busy time), as I
monitor on and off all day and there is PLENTY of traffic all day
long. It seems to have more to do with temperature. You can clearly
hear the signals come on and fade off frequency
I had
On Thu, Oct 29, 2009 at 1:45 PM, Joe wrote:
Mike Besemer (WM4B) wrote:
Joe,
The problem isn’t traffic dependant (10 am being a busy time), as I
monitor on and off all day and there is PLENTY of traffic all day
long. It seems to have more to do with temperature. You can clearly
hear
There are at least two transmitters at two sites... not likely they're
all bad. But... the owner has assured me they're clean and I haven't
seen anything hokey on the spectrum analyzer from the repeater site.
Mike
WM4B
On Wed, Oct 28, 2009 at 2:46 PM, dmur...@verizon.net wrote:
Did you look a
Sounds like a bad case of mixing products (i.e. 2A-B) where A is frequency A
and B is frequency B. Several years ago, I helped cure a similar problem on
146.820 MHz. Turned out four transmitters were involved in that fracas and it
only took two to start the repeater howling.
152.480 is one
Good question about how the data was getting to both transmitter
sites. I've been meaning to ask that question and keep forgetting.
I'll report back.
Mike
WM4B
On Wed, Oct 28, 2009 at 3:16 PM, Matt Harker wrote:
Sounds like a bad case of mixing products (i.e. 2A-B) where A is
frequency
Dirty paging TX. Seen that many times.
Joe M.
Mike wrote:
A couple of weeks ago, our repeater system started to experience interference
from a paging system. The repeater is on 146.850 (-600 KHz), with the
antenna system about 120 feet up a water tower. The repeater itself is an
Mixing products generally don't sweep through the spectrum, as usually
both TXs are stable and the mix would be as well.
Joe M.
Matt Harker wrote:
Sounds like a bad case of mixing products (i.e. 2A-B) where A is
frequency A and B is frequency B. Several years ago, I helped cure a
I would look at the exciter freq on the uhf paging transmitter.
It would help with some info on the paging transmitters. Model and such.
-Original Message-
From: Repeater-Builder@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Mike
Sent: Wednesday, October 28,
Mike,
If it moves around based on time of day, my first guess is a PA that's gone
bad, and has a parasitic that's temperature-related.
If you've tracked an individual spur drifting 70 kHz up the band during a
single transmission, this is not some (intentional) oscillator drifting, but
some
@yahoogroups.com
[mailto:repeater-buil...@yahoogroups.com] On Behalf Of Paul Plack
Sent: Wednesday, October 28, 2009 6:29 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Pager Interference to 2-meter VHF Public
Service Band
Mike,
If it moves around based on time of day, my
] On Behalf Of Kevin King
Sent: Wednesday, October 28, 2009 6:02 PM
To: Repeater-Builder@yahoogroups.com
Subject: RE: [Repeater-Builder] Pager Interference to 2-meter VHF Public
Service Band
I would look at the exciter freq on the uhf paging transmitter.
It would help with some info
motivating.
- Original Message -
From: Mike Besemer (WM4B)
To: Repeater-Builder@yahoogroups.com
Sent: Wednesday, October 28, 2009 5:34 PM
Subject: RE: [Repeater-Builder] Pager Interference to 2-meter VHF Public
Service Band
I'm with ya on your third paragraph. We've worked
Sent: Wednesday, October 28, 2009 7:48 PM
To: Repeater-Builder@yahoogroups.com
Subject: Re: [Repeater-Builder] Pager Interference to 2-meter VHF Public
Service Band
Mike, the interference is clearly not caused by your own rusty roof, and is
both eggregious and easily documented. I know we
Hello Mike.
The first clue is that the signal is moving up and down the 2 meter
band. This would tell me that something not frequency controlled is
causing the interference. Not frequency controlled would mean that the
transmitter is not crystal or GPS locked to a specific frequency. Now,
I have to wonder how he can say his stuff is clean when this just
started a couple weeks ago. Did he perform a PM check within the last
two weeks? Unlikely.
Stuff can go south in a minute, and seldom just before you check it.
Joe M.
Paul Plack wrote:
Mike,
If it moves around based on
Locally, years ago, we had a military transmitter that had a
wandering spur. I am near Charleston, SC. The spur was strong enough
to key up amateur radio repeaters in the two meter band from
Wilmington, NC to Savannah, Ga.
The offender turned out to be a 250 Watt base station used to cover
: There is some software that allows finger printing of a transmission
: base on the lockup signature and oscillator stability as seen on the
: transmitted signal.
I am interested in such things! Anyone have any good suggestions or input
regarding software or systems?
Kurt
On Wed, 28 Oct 2009, Facility 406 DM09 wrote:
I am interested in such things! Anyone have any good suggestions or
input regarding software or systems?
Cavity - digital storage oscilliscope.
--
Kris Kirby, KE4AHR
Disinformation Analyst
I'd use a really fast spectrum analyzer, meaning an analog one and
point a video camera at it
On Wed, Oct 28, 2009 at 10:19 PM, Kris Kirby k...@catonic.us wrote:
On Wed, 28 Oct 2009, Facility 406 DM09 wrote:
I am interested in such things! Anyone have any good suggestions or
input regarding
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