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In a conventional radio system, a radio can access only one channel at a time. If that channel is in use, the user must either wait for the channel to become idle or manually search for a free channel. The radio service code for conventional systems is IG (Business).
A trunked radio system differs from a conventional system in its ability to automatically search two or more available channels and assign a user an open channel. See 47 CFR 90.7. On December 7, 2001, the Wireless Telecommunications Bureau (Bureau) accepted and approved consensus monitoring levels for non-exempt trunked systems operating on Private Land Mobile Radio (PLMR) channels between 150-512 MHz. These monitoring levels were recommended by the Commission's certified Frequency Advisory Committees ("FACs" or "coordinators") for PLMR spectrum.
For more information see Public Notice DA 01-2852 (Word).
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