Uniden BC246T English Owners Manual - Page 24
Types of Trunking Systems, Motorola Trunking - parts
View all Uniden BC246T manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 24 highlights
If you are a new scanner enthusiast, you might want to read the first part of this manual and use your scanner in conventional mode before you begin trunk tracking. Understanding scanning fundamentals and terminology will make trunk tracking much easier. If you are already an experienced scanner operator, you might want to go to "Programming Motorola Systems" on Page 53, "Programming EDACS Systems" on Page 57, or "Programming LTR Systems" on Page 59 now. Types of Trunking Systems Trunking systems divide a few frequencies among many different users, but the way that each system does this is slightly different. This section describes some of the technical data behind Motorola, EDACS, and LTR trunked radio systems. Motorola Trunking While there are different types of Motorola trunking systems, they all use the same basic trunking method. The system consists of one control channel (or as many as 4 per system), plus one or more voice channels (typically 10, 20, or 28 total channels). When a user presses Push To Talk (PTT) to transmit, their radio first sends their talk group information to the control channel. The computer then assigns that talk group to a specific voice channel and transmits that data over the control channel. All radios in that talk group switch over to the assigned voice channel and the user can begin speaking. This all typically takes place in about a second...the person transmitting hears a beep from their radio when the channel is assigned and then it is OK to start talking. The systems in use are: Motorola Type I - the radios send the radio ID, the fleet and subfleet talk group ID to the control channel each time they transmit. To program a Type I system, you need to know the system's fleet map. The most common fleet maps are included in "Preset Fleet Maps" on Page 103. You can also find fleet map resources on the web. Understanding Scanning 24