Pro 433 and talk groups

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steveh552

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Oct 7, 2005
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333
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Canal Winchester Ohio
I just bought a 433, my first scanner since back when 10 channels were top of the line. I know very little of talk groups and trunking and all that stuff. Iv read the manual 3 times, it talks of programing talk groups and such.

My question, there is only one local goverment I can hear using trunked, the police and fire and public works all has their own talk groups. Am I able to set it so I only hear say the police or fire of this city and not the street dept? If so, specific directions, better than the manual would be awesome, and do not have computer programing cable.
 

CStarr59

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Feb 24, 2008
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340
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Schuylkill County PA.
Hey Steve, The pro-433 is a great unit. I've had mine about a month now and I like it alot. I have no trunking programmed, only conventional frequencies so I can't help you on that. Maybe if you posted it in the "Trunking" section in this forum you might get a better responce. This is a great forum and you will find the help you need. Craig
 

JohnNDenver

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Jan 23, 2005
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22
Location
Littleton Colorado
Programming model 433 & 528

Took me about 25 hours to get my 528 programed correctly Get the BUTEL.com software and the correct connecting cable from R/S Then you can download the data you need from this site.

The let the scanner search for the groups and your hot.
 

DickH

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Mar 12, 2004
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4,061
what is the "trunking" technology and how is it used?
Here is a simple explanation of how a Motorola trunking system works:

The object of trunking is to allow many users to share a relatively few frequencies.
A trunking system is controlled by a computer. Information is sent and received from the radios to the computer on a control channel, sometimes called a data channel. It sounds like a strong buzz. When a scanner is trunking properly, you will not hear the control channel.

A large system can have up to 28 freqs., 4 of which may be used as control channels. The control channel may be changed once a day or as often as the programmer decides. Newer scanners need only the control channel to track the entire system, but it is best to put in all the freqs. in case they change the CC some day. Portland area systems seldom change the control channels.

Each group of users (Fire, Police, etc.) are assigned identifiers called TALK GROUPS or IDs. In a Motorola Type II system, the most common type, TGs are usually in 32 number steps from 16 to 65536; 16, 48, 80 --- 4656, 4688, 4720 --- 28944, 28976, 29008, etc. System radios have up to 160 TGs programmed into them.

When a mic is keyed, data is sent to the computer. The computer chooses an unused freq. and sends that data to all the radios set to the TG of the originating unit. This all happens in a fraction of a second and it happens EVERY time a mic is keyed.

EXAMPLE:
Fire Dispatch calling Engine 4 (TG 4528 on 856.7125)
Engine 4 answering Dispatch (TG 4528 on 867.2625)
Respond to 73 Elm Street for a grass fire (TG 4528 on 866.9625)
Engine 4 responding to 73 Elm Street (TG 4528 on 858.4375)

If you have entered TG 4528 into your scanner, it will decode the control channel data and change frequencies to follow the conversation on TG 4528.
 
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