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Another type, scan based trunked systems, (not shown) do not have a control channel. Frequencies are for discussion purposes and do not correspond to any specific system. 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 view of the wider areas covered by these networks and the greater complexity, equipment has to be standardised so that suppliers can manufacture in higher volumes and thereby reduce costs to acceptable levels. Most trunked radio systems follow the MPT1327 format. To implement trunked PMR a network of stations is set up.
The TETRA trunked radio standard was developed by the European Telecommunications Standards Institute (ETSI), as a digital alternative to analogue trunked systems. However, TETRA, with its enhanced encryption capability, has developed into a higher tier (public safety) product, currently mainly used by governments, some larger airports and government-owned utilities.
An Icom IC-R5 hand-held scanner A GMRS radio that also has scanning capabilities. A radio scanner or simply scanner is a radio receiver that can automatically tune discrete frequencies, scanning over a frequency band to find a signal until the initial transmission ceases.
For example, it's no use if you need to scan the spread-out pages of a magazine page. Or anything that’s laminated. Or, indeed, any valuable and delicate material that you just can’t trust to ...
Many large public safety and state agencies use SmartZone systems for wide-area communications. Each individual trunked system is considered a site, or a sub-system of a Simulcast system, and is controlled by the Zone Controller, which is the master controller for all activity and is where all network links terminate.
LTR MultiNet Systems are APCO-16 compliant LTR Trunked Radio Systems and thus are mostly found in use as public safety systems. LTR MultiNet systems usually have one or more "status channels" that act like a control channel in a Motorola or EDACS system, however these channels can also carry voice transmissions simultaneously.
A land mobile radio system (LMRS) is a person-to-person voice communication system consisting of two-way radio transceivers (an audio transmitter and receiver in one unit) which can be stationary (base station units), mobile (installed in vehicles), or portable (handheld transceivers e.g. "walkie-talkies").