Channel ID Calculators for Type II Trunking Radio Systems

These programs takes as input a number representing the talk group displayed on a trunking receiver. The output is the base channel of that ID and a list of its various modes. It also does a simple check to see if the channel is a valid Indianapolis MECA channel ID. The program is usable with all normal Type II Trunking Radio Systems.

Trunkcalc2 - GTK+ 2.0

Features

Calculates Talk Group Modes and displays their usage
Input and convert between Decimal (Trunk Tracker), Hexadecimal (Trunker, Treport, etc), and Motorola talk group formats
Indicates whether or not the talk group is encrypted.
Indicates if the talk group falls into Indianapolis MECA's typical scheme.

Redhat 8 Package

TrunkCalc2 for Linux (requires GNOME 2)

C Source Code

TrunkCalc2 Glade2 project with C source

TrunkID - GTK+

Windows 98, Me, 2000, XP: Windows Executable (includes GTK 1.3)
Linux 2.2 (glibc 2.1) Executable: Linux 2.2 Executable (requires GTK 1.2 & glibc 2.1; e.g. Redhat/Mandrake 6.x)
C Source Code: Glade project with C source

Visual Basic

Windows 32-bit Executable: Windows 95, 98, NT, 2000 Executable (requires VB 5 Runtime, already on most systems)
Visual Basic Source Code: Visual Basic 5 project and source files

PHP

PHP Source Code: PHP Source

Simple/Fuzzy Manual Calculation

For those without Boolean calculators, you can determine a valid base channel like such:

If the result is an Integer (e.g. 34.00, not 34.12) then you are on a channel operating in mode 0: baseChannelNumber / 16

Complex/Accurate Manual Calculation

For Motorola Type-II Trunked systems you can use the following Boolean equations to calculate channel information

% is the modulus operator, modulus is a Boolean math operator (Like +, -, /, *) which returns the current 'mode' of a multiplexed binary system. It is simply a special form of whole integer division; hence the % sign which looks like a funky / sign. In simple math 5 / 2 = 2.5 where 5 % 2 = 1 (4 / 2 remainder 1)

Channel Mode

channelMode = channelNumber % 16: 2 = 4722 % 16
baseChannelNumber = channelNumber - (channelNumber % 16): 4720 = 4722 - 2

Scanning Note

Indianapolis MECA System 1 & 2 normally only use modes 0, 2, 3, 7, 8
Generally multiple modes are not used on any one channel. For example, 4720 wouldn't be activated while 4722 is in use.