Several years back our local radio station on 99.3 Mhz has a AM transmitter on
1520 Khz. They began to get into all the 49 Mhz phones, radios, as well as
hitting some of the commercial frequencies in the aircraft and 150 megs. The
tech went out, and after several days of trouble shooting, they found that when
they turned off either of the systems, the problem would disappear. From what
I remember, they claimed they found three bad connectors on the system that was
causing all the interference. Both of these transmitters are located on the
same tower.
Once the connectors was changed the problem disappeared and has to my
knowledge has never returned.
Sometimes we find what can't happen, can.
Mathew
Jamey Wright <[EMAIL PROTECTED]> wrote:
Make sure all of the shields are in place on the MASTR II. We
had one here on a Public Safety freq that was co-located with a 100 KW FM.
Between the squirrels calling the MASTR II home and chewing on some of the
wiring and some man-made wiring problems, it sounded like the person on the
repeater was riding around with the FM radio turned waaaay up.
Jamey Wright
Systems Analyst
Morgan County EMCD 911
Decatur, AL
256-552-0911
---------------------------------
From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of
Daron J. Wilson
Sent: Tuesday, February 13, 2007 1:22 PM
To: [email protected]
Subject: RE: [Repeater-Builder] Ok, here's a weird one....
Ø Question: The only way I see this happening is due to some AM
> component on radio station's transmitter.
>
> Thoughts?
Ive got one site with similar problems. MastrII repeater, in a metal cabinet,
grounded, bonded quite well. Shielded audio cables, ARCOM RC-210 controller
(shameless plug for Ken) and intermittent FM station audio. It comes and goes,
some sort of mix with something, but the shorter shielded hook up cables helped
it quite a bit. Its using a MastrII power supply and back up battery. Its
tolerable most of the time, sometimes enough audio to actually hear what is
being said, almost always the audio is on the tail of the repeater, not
noticeable when the repeater is actually repeating. Shorter shielded cabling
seemed to help the most.
73
Daron
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