From The RadioReference Wiki

Unitrunker Screenshot monitoring a Motorola system


UniTrunker supports control channel monitoring for the following trunking types:

UniTrunker also supports downloading system information from the Web Service.

UniTrunker does not currently support LTR Passport or MultiNet.

UniTrunker cannot monitor or decode conventional P25 data or audio. However, a program called kNACk is included with the Unitrunker distribution. kNACk can be used to capture NAC codes on a P25 conventional system.

What Can UniTrunker Display?

  • Basic system information - system type, system id, talkgroups, and radio ids.
  • Basic site information - site or cell number, and list of channels.
  • Site call activity - who's talking, on what channel, and to whom.
  • Neighboring Site information - list adjacent cell or sites with control channels.
  • User roaming - what radios are registed to a particular site.
  • User affiliation - what talkgroup a user has requested.
  • Patches - a dispatcher initiated action that joins two or more talkgroups together.



Public Beta #16 - released November 15, 2007 (Version

Frequently Asked Questions

Q: Do I need a radio with discriminator tap?

A: The short answer - Yes. The long answer - You may be able to decode 3600 baud Motorola control channels with a 50-70% decode rate without a discriminator tap. This is totally dependent upon the scanner/receiver and sound card you are using. You will not be able to decode EDACS, or APCO Project 25 without a discriminator tap. MPT1327 is the exception. It generally decodes equally well with speaker audio or discriminator audio.

Q: Do I need a slicer?

A: No.

Q: Do I need a computer that runs DOS?

A: No. This program does not run on DOS.

Q: Will this work on Windows? If so, what version?

A: Yes - Windows 95 (with IE4 or later), Windows 98, ME, 2K, and XP (all flavors).

Q: What types of trunked radio systems can I monitor?

A: Motorola, EDACS, APCO Project 25, and MPT1327.

Q: How can I use this to listen to calls on a trunked radio system?

A: Yes. You need a second radio that accepts computer control to tune to voice calls as they occur.

Q: Does the program permit downloading talkgroup information from the Web Service?

A: Yes - you can download Motorola and APCO P25 systems by trunking system ID. You can download EDACS by looking up the RR DB SID (that's the ID # assigned by the database to each trunked system). You must be a paid member with a valid user id for this feature.

Q: Can I import my trunker data files?

A: Yes - read the Hints section of the documentation that describes how to do this.

Q: How do I install this MSI file?

A: For Windows XP, double-click on the file. For earlier Windows, you may need to install something from Microsoft.

Q: How much does it cost?

A: Nothing. As long as you follow the license and copyright notice - the program is free. No registration either.

See also