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Unitrunker is a program for monitoring control channel activity on trunked radio systems. The program runs in Microsoft Windows 95, 98, ME, 2K, XP, Vista and Windows 7. The program requires baseband audio from a discriminator tapped radio on an audio input such as the line input or microphone input of a Windows PC. The program will also accept data from any of several models that provide a control channel feed over the serial port interface.

Trunking formats understood by Unitrunker are:

Format recognition is automatic. Program displays call activity and other trunking events broadcast over the control channel. Data is saved to a group of text files - grouped by system type and ID. The data files are compatible with most spreadsheet programs like Excel. You can also download trunking information from the Radio Reference database (RR requires a very modest subscription fee).

The program also provides voice following (follow conversations as they move from channel to channel) with the addition of a second radio receiver. A large number of computer controlled receivers are supported.

Two additional utilities (not included with the program) are Uniscope and kNACk.


kNACk recognizes APCO Project 25 voice channels enough to display the 12 bit NAC code. The NAC code is similar to CTCSS tones and DCS codes (aka PL or DPL).


Uniscope is a simple oscilloscope like program for diagnosing sound configuration. Here's a how-to for using Uniscope.