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Only hearing one side.

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polygonskull

Member
Joined
Jun 17, 2006
Messages
4
Hi.

I'm hoping someone can give me a solution to this problem im having. I'm monitoring a county wide Motorola system on my PRO 97. All of the frequencies fall into the 856 - 860 mhz range, expect for one. Hear is some information on the police department im having trouble with...

"Soddy Daisy now uses the 854.9625 MHz conventional repeater as their main channel but transmissions by the dispatcher are simulcast on both this talkgroup and the repeater."

I have the 854.9625 frequency programmed into the department's own bank, along with the other frequencies of the system. The problem is that i'm only hearing dispatch audio from that police department. No car to car, or car to dispatch talk *unless* i switch the channel in which they are talking on to FM mode. It trunks other frequencies besides 854.9625 when the dispatcher talks, so it's a hassle hunting down the frequency and switching to FM mode on.

Is there some other way to monitor both sides of communication besides to manually FM mode the frequency all the time? I Can't do it fast enough... The only time i was able to hear partrol to dispatch was when i lucked out in TRUNK mode and heard dispatch ask a question, and i had the same freq programming into Fine Tune, so i was able to hit Tune and go right to it... It's a small city, and not alot of radio traffic to fully test methods...

Hope someone understands and can help...

Reference to the system:
http://www.scanchattanooga.com/trunking/chattanooga.php
 

JoeyC

Senior Member
Joined
Dec 19, 2002
Messages
3,395
Location
San Diego, CA
I'm not sure I'm following you. I gather from what you said, they are simulcasting the trunked talkgroup on a conventional repeater? If so, then listen to one or the other. Mixing conventional freqs with a trunked system in the same bank shouldn't be done except if you have NO other channel available. (and even so, there is no need).
It also sounds like you haven't programmed the talkgroup in and are ID scanning (or in closed mode) the trunked system.
 

polygonskull

Member
Joined
Jun 17, 2006
Messages
4
I actually didn't mix the conventional repeater frequency with the others in the Bank, i tuned to it in Search mode so it'd be FM. I have the 854.9625 freq, along with the others that fall into the 856-860 range all in a single bank, with the properTalkgroups programmed. Still picking up dispatcher only... This is the only PD im having problems with. The 8 or so other agencies all behave normally... Strange.
 

W4KRR

Member
Premium Subscriber
Joined
Apr 1, 2001
Messages
2,917
Location
Coconut Creek, FL
Sounds like you may have your scanner programmed incorrectly. Based on what I have read, the Soddy Daisy PD simulcasts their transmissions on 854.9625 conventional, as well as the trunked system. So, you need to program the Chattanooga/Hamilton County Trunked Radio System as a Motorola trunked system, then program only the Soddy Daisy talkgroup, which according to the link you provided, is 21872. You should hear both sides of the conversation here.

Apparently, they aren't re-transmitting the output from the mobile units on the conventional frequency of 854.9625, so try monitoring the talkgroup from the trunked system only, and forget about 854.9625, as it isn't part of the trunked system.
 
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