LTR Standard and Passport systems are hybrid
Trunked Radio Systems
A trunked radio system is a two-way radio system that uses a control channel to automatically assign frequency channels to groups of user radios. In a traditional half-duplex land mobile radio system a group of users (a ''talkgroup'') with mobile ...
that have some
LTR Standard talkgroups and some
LTR Passport
PassPort is a type of LTR Trunked radio system designed by Trident Micro Systems, which consists of multiple radio repeater sites linked together to form a wide-area radio dispatch network.
Purpose
Radio signals have a limitations due to distance ...
talkgroups.
Logic Trunked Radio
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