DMA Scanners and Trunking

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Revision as of 19:59, 1 November 2008 by Ka3jjz (talk | contribs)

What is Trunking?

Trunking involves the use of many agencies, sharing a specific set of frequencies. Each agency - or sometimes more than one - are allocated logical addresses referred to as a Talkgroup. If you are new to this topic, stick to the Overview section for now. Bookmark this article and come back to it later if you wish to learn more details.

How Can I Determine Whether a Model Will Trunk My System?

Each scanner's article has a section entitled RR System Compatibility. This section is designed to mimic, as closely as possible, the listings of system types and voice as found on the database. In general, if your system type or voice is not listed in this section, chances are the scanner will not be able to decode it.

The following summarizes each of the DMA scanners, and types of trunking they will handle;

What Formats Cannot be Trunked?

Some of the most common formats include:

How do I Find Out What Systems exist in my Area?

RadioReference has an extensive and searchable database for many areas of the country. All you need to know to use it is your state, county and sometimes the city of interest. Look in the upper left tab for 'Trunking'. This lists all the trunking systems in the database for your area.

I am having trouble receiving TGs above 4096

  • Early versions of the firmware had these issues. They have since been solved by firmware updates.

Trunked audio chops out / stops after a couple seconds

  • Most of the time, this is caused by the incorrect setting of the system type (usually set to P25 for NON-P25 systems). P25 should only be used for P25 SYSTEMS, NOT for P16 systems with P25 CAI voice channels.

Return to the Uniden DMA FAQ