| All Call – An ID code that is programmed to be decoded by all users in a group. This allows a dispatcher, for example, to communicate with all users in a group at once.
Channel – A memory location used to store a single frequency.
Code Block – A group of consecutive ID codes that can be any size up to all 250.
Conventional Operation – This type of radio system operates on only a single channel. Trunking is not used and the radio channel is selected manually
Dispatch Calls – Standard mobile-to-mobile or mobile-to-base calls that do not use the Public Switch Telephone Network (PSTN).
Fixed ID Codes – Receive ID codes that are always decoded by the transceiver regardless of the group selected by the group select switch.
Group Call – A call to a group of mobiles.
Interconnect – This is a telephone interface between a repeater or control station and the Public Switched Telephone Network (PSTN). This allows telephone calls to be placed and received from a mobile transceiver.
Logic Trunked Radio – Logic Trunked Radio (LTR) systems utilize a concept called trunking. This method of channel management gives all users of the system automatic access to all channels. This results in minimum waiting to make a call and the most efficient use of the available channels. Trunking is controlled by logic circuitry in the mobile transceivers and the repeaters. This circuitry continually monitors the system and generates data messages which update the mobiles and repeaters as to which repeaters are free.
Mobile – This term refers to a transceiver mounted in a vehicle but can also be applied to other types of transceivers such as handhelds and control stations because they all operate basically the same. A control station is basically a mobile transceiver at a stationary location such as an office site.
Priority Channel: A channel which is scanned regularly during normal scanning.
Scanner: A radio that can tune quickly and/or automatically to a wide range of frequencies used by hobbyists to monitor police, fire, and other emergency services.
Selectable System – This normally applies to the systems selectable by the transceiver system select switch. Each system can be programmed with almost an entirely different set of transceiver operating parameters including home repeater, receive and transmit ID codes, and repeater channel numbers. Systems can either be the LTR (trunked) format or (sometimes) conventional (non-trunked) type.
Selective Call – The ability to selectively call individual mobiles or control stations. The system or group select switch can be programmed to perform this function.
Service Band: A particular frequency range used for a particular purpose.
Site – A group of repeaters that are connected to the same high-speed data bus. Up to 20 LTR repeaters can be connected together in this way.
Trunk tracking: Following conversations that are broadcast on radios automatically tuned by a computer. |
