Tetra was specifically designed for use by government agencies emergency services police forces fire departments ambulance for public safety networks rail transport staff for train radios.
Trunked radio system defined.
However if the audio channels are within the same chunk of received bandwidth as the control channel it is possible to use just one dongle to follow trunked conservations.
This method of channel management gives all users of the system automatic access to all channels.
This is an example of statistical multiplexing.
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.
These systems typically have access to.
Trunked radios use several channels or frequencies and allows those channels to be shared by a large number of users in multiple talkgroups without their conversations interfering with each other.
This results in minimum waiting to make a call and the most efficient use of the available channels.
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.
A trunked radio system does this by taking advantage of the fact that not every user will want to transmit at any given time.
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.
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.
Talkgroups are defined groups of users.
A trunked radio system allows a larger number of users groups to share a smaller number of frequencies.
A trunked radio system is a computer controlled network that automatically connects users to available radio channels when they need them.
Terrestrial trunked radio tetra.
These standards define the messaging between portable and mobile radios in the field and the network equipment.
Usually to listen to trunked radio systems two rtl sdr dongles are required.
Trunked radio systems are one of the most complex types of radio systems in use today.
In trunked radio systems in addition to the cai there are standards that define how the trunked radio frequency subsystem or rfss should operate.
The cai is used on both conventional and on trunked radio systems.
Trunking is controlled by logic circuitry in the mobile transceivers and the repeaters.
Logic trunked radio ltr systems utilize a concept called trunking.
One for decoding the trunking control channel and another for listening to the audio channel.
