MA State Police 800 MHz system

MA State Police 800 MHz system

Post by Steve Woodwa » Thu, 27 Jan 1994 10:49:27

I would like to know if there is a way to get rid of celular interfearance
when listening to non-cellular frequencies. I'd like to listen to the
State Police 800 MHz stuff, but the cellular images get picked up by my
BC890XLT so much that it's too anoying to listen to. You constanly have
to keep hitting scan because the squlch is broken by a cellular image
all the time. If I used a specific 800 MHz antenna would this clear up?
If there were PL tones on the MA State police 800 MHz system I could
get the CTCSS board for the 890XLT, but thewre doesn't seem to be. Also
I have a 2m/70cm antenna on my car, and a glass mount 25-1000MHz
cellular look-a-like (but longer). Is there anything wrong with unscrewing
the all band antenna and putting a real cellular antenna on it?
And lastly, how can I use both antennas together for 2m/70cm/800MHz
all at once. Is it as easy as taking a BNC splitter and screwing both
of them in? Or will this cause undesired reception from the antenna that
isn't currently being used? (If I'm listening to a repeater on 2m, is the
presence of the cell antenna going to cause some random frequency to
come in also? If anyone has any answers for me please send me e-mail
as I don't have usenet access. :(   (email betabbs.trystero.com if possible
but trystero.com is fine too)
Thank you very much to all with help and all that took the time to read
in hopes of helping.
 
 
 

MA State Police 800 MHz system

Post by Michael P. No » Thu, 27 Jan 1994 10:56:00


Sorry man, but as far as I know there is no way of getting around
this cellular problem.  I enjoy listening to my area's 800 mhz
system and have the same problem.  If anyone can solve this
problem PLEASE e-mail me!
MIKE
--
Thanks,
Mike Noll

 
 
 

MA State Police 800 MHz system

Post by Brett Miller - Support Engine » Thu, 27 Jan 1994 11:29:49


Quote:

>Sorry man, but as far as I know there is no way of getting around
>this cellular problem.  I enjoy listening to my area's 800 mhz
>system and have the same problem.  If anyone can solve this
>problem PLEASE e-mail me!
>MIKE
>--
>Thanks,
>Mike Noll

The only two things that come to mind (short of getting a better scanner)
are 1. Try an attenuator.  You should be able to attenuate the images while
still leaving enough signal to receive the desired station.  2. In addition
to the attenuator a directional antenna might help.  If you can piont it
toward the 800MHZ system without pointing it at any cell sites, you may
attenuate the cell signals (less capture) and it would also give better
performance with an attenuator.  The more narrow the beamwidth the better.
This assumes that the 800MHz system has a single repeater station (which it
might).

--


American Fork, UT           IP: 128.215.210.58

 
 
 

MA State Police 800 MHz system

Post by b_c.. » Thu, 27 Jan 1994 22:35:27

You image problems cannot be fixed, at least easily.  I have the same problem
with a PRO-37.  There is nothing you can do about it, it is problem with the
radio's design.

As far as CTCSS, this would work if the MA State was using it, but they are not
using it on the troop channels.  The metro 28 channel trunk system, which in-
cludes the old metro troop and some of troop A (A, A5) use no tone on their
frequencies.  It is trunked and is not required for their use.  Some of the
conventional 800 state channels use tones:

        A1 - Andover, A7 - Pebody    858.2375, use a Digital 051 (DPL) tone
        C - Holden, C7 - Clinton     853.8375, use a CTCSS tone of 146.2
        Statewide                    866.0125, use a CTCSS tone of 156.7

There are more to add to the above, but I cannot think of them at this point in
time.

--
Name:    Bill Cobb

Phone:   508.635.8458
Address: MS DSG1-2/E6
         Digital Equipment Corporation
         Forest Street
         Marlboro, MA

 
 
 

MA State Police 800 MHz system

Post by bill nels » Fri, 28 Jan 1994 16:13:19

:
: You image problems cannot be fixed, at least easily.  I have the same problem
: with a PRO-37.  There is nothing you can do about it, it is problem with the
: radio's design.

Well, you could put a sharp cutoff low pass filter in the antenna circuit. It
would help quite a bit.

Other people have mentioned other possibilities.

Bill

 
 
 

MA State Police 800 MHz system

Post by Stuart Lit » Fri, 04 Feb 1994 23:49:10

Does anyone know the frequencies for the new MA State Police 800 system???

Please post them for all.  Also what is the status of the old 44.XX and 42.XX
frequencies they were using???

 
 
 

MA State Police 800 MHz system

Post by Terry M. Stader KA8SC » Thu, 10 Feb 1994 11:38:18

>DATE:   Thu, 3 Feb 1994 14:49:10 GMT

>Does anyone know the frequencies for the new MA State Police 800 system???

>Please post them for all.  Also what is the status of the old 44.XX and 42.XX
>frequencies they were using???

Stuart.... most of the 800 MHz freqs being used by the MSP are in the
same grouping as the old "Met" system. There are an additional groups
of frequencies that have been added. If you have access to the the new
5th Edition of Scanner Master, you'll find the groupings. There are a
few odd freqs as well.

What I have found is that the groupings being used here in Mass. are
not the same rotation as what the guys in NJ are talking about... but I
suspect that because our system is still growing things are not set
in stone just yet.

I have one of the new MTS2000 portables and will be getting a new
mobile very soon... when I do... I'll see if I can figure out the groupings.

Right now...the old "Met" system sites are the only ones being used for
the trunking of Troop A. The Andiver site, Holt Hill, is supposed to be
the next site up for trunking. Robbins Hill in Chelmsford was supposed
to be next... but I heard something about Nabscott Hill too. I guess
we'll have to wait. I can tell you that the coverage in many places
outside of 128 is very marginal! But give it time!