Pro-94 trunk programming

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Premium Subscriber
Jun 19, 2016
Just got a Pro-94 and am adding frequencies to it. Wanted to add some trunk groups for AZ but I find myself a bit confused as the listings here Maricopa County Trunking System, Maricopa County, Arizona - Scanner Frequencies show decimal listings as well as frequencies but I have zero clue how (if possible) to program by using the decimal value. I have read through the manual and even the "easier to read" manual but still am confused. Was wondering if anyone has done the programming using the decimal values or if it has to be done by way of control frequency and then individual frequencies.

It would be better if the software for programming wasn't limited to a not so user friendly option as well.

Also found this document PRO-94 (20-524) Tutorial: How to Program Trunked Frequencies but it doesn't mention the decimal values either


Feed Provider Since 2012
Jan 4, 2009
Grove City, OH (A Bearcat not a Buckeye)
Program the frequencies into a trunked system, then the decimal numbers are talk groups. On that scanner you will only be able to hear the analog talk groups (A), not the digital (D) ones.


Wiki Admin Emeritus
Jul 22, 2002
Bowie, Md.
Just note that anything marked 'D' is something you will not be able to hear with a 94. That is an analog only trunktracker.



Mar 12, 2004
First, you need to understand how a trunked 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 (data) is exchanged between the system radios and the computer on a control channel, sometimes called a data channel. It sounds like a strong buzz.

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. Some scanners need only the control channels to track an entire system. Just put in the 4 Control Channels.

Each group of users (Fire, Police, etc.) is assigned TALK GROUPS. In a Motorola Type II system, the most common type, TGs are usually in 32 number steps starting with 16 and going up to 65536; 16, 48, 80 --- 4656, 4688, 4720 --- 28944, 28976, etc. System radios can have more than 100 TGs programmed into them.

After all the freqs. have been entered and it is "trunking", the Banks become SCAN LISTS where you enter the Talk Groups you want to hear. Use the Talk Group numbers in the DEC column.

When a user pushes the talk button on his radio, data is sent to the computer. The computer chooses an unused freq. and sends that data to all the radios using the TG of the originating unit. This all happens in a fraction of a second and it happens EVERY TIME a radio is used.

Fire Dispatch calling Engine 4 (TG 4528 on 856.7125)
Engine 4 answering Dispatch (TG 4528 on 852.2625)
Respond to 73 Elm Street (TG 4528 on 855.9625)
Engine 4 responding (TG 4528 on 851.6375)

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