A presentation on the basics of trunked radios systems was done at defcon 15 and a video of that presentation is available here.
Trunked radio systems tutorial.
Trunked radio systems in depth.
This is an example of statistical multiplexing.
However this is very inefficient as the frequency may not be in use for the majority of the time.
The control channel computer sends packets of data to enable one talkgroup to talk together regardless of frequency.
A trunked radio system is a computer controlled network that automatically connects users to available radio channels when they need them.
A trunked radio system allows a larger number of users groups to share a smaller number of frequencies.
In a traditional half duplex land mobile radio system a group of users a talkgroup with portable two way radios communicate over a single shared radio channel with one user at a time talking.
In trunked radio system analog trunked radio is going to be obsolete since digital trunked radio offers better functions and features in terms of voice quality security spectrum efficiency and.
Trunked radio system a trunked radio system is a complex type of computer controlled radio system.
This is often a difficult concept for scanner enthusiasts to understand as trunking represents a paradigm shift in design of the system.
In a normal radio system one company or talkgroup might use a single frequency for radio communications.
A trunked radio system is a specialized repeater system with one or more towers and multiple frequencies which allows channelized semi private conversations between many more groups of users than it actually has allocated rf channels.
Project 25 p25 or apco 25 is a suite of standards for digital mobile radio communications designed for use by public safety organizations in north america p25 radios are a direct replacement for analog uhf typically fm radios but add the ability to transfer data as well as voice allowing for more natural implementations of encryption and text messaging.
In fact very few 2 way radio users transmit continuously.
When a user say an officer or sergeant in the field wants to send a message the system assigns them to an available channel decreasing the likelihood that they ll have to wait for a free channel to.
In a trunked radio system a small set number of frequencies are shared between a large number of talkgroups.
The trunking radio in a patrol car for example is much more sophisticated than the simple transceiver previously used in a simplex or repeater configuration.
Trunked systems use a few channels the actual frequencies and can have virtually unlimited talkgroups.
Trunked radio systems are one of the most.
A trunked radio system is a digital two way radio system that uses a digital control channel to automatically assign frequency channels to groups of users.
A trunked radio system does this by taking advantage of the fact that not every user will want to transmit at any given time.
