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SECTION II EXISTING PUBLIC SAFETY RADIO SYSTEMS IN ANOKA COUNTY 2.1 SYSTEMS AND RADIO CHANNELS 2.1.1 Fire Service Radio Systems in Anoka County Most of the fire service agencies in Anoka County utilize a single County fire channel, although a group of communities in the south central part of the County also have a separate radio frequency for the fire services. In addition to the main and single fire frequencies, there are three frequencies, called T AC A, B, and C, that are available for use at fire scenes. Both the County-wide fire channel and the channel serving the three communities are used both to alert firefighters to respond to a fire incident and to provide two-way communications between a fire dispatcher in Anoka and firefighter personnel who are responding to, and at the scene of, a fire incident. The alerting of firefighter personnel to respond to the fire incident is performed over a one-way radio paging process to radio pager receivers that are used by the firefighters. The primary County fire channel is a single frequency, simplex channel with a single primary transmitter located at the Paul Parkway site with backup transmitters at the Andover (Radio Shop) site and at the Anoka County Government Center site. The separate channel serving the three fire services in the south central part of the County is also a single frequency, simplex channel with a transmitter at the Spring Lake Park water tank site with a backup transmitter at the Bunker Park site. Because the talk-back capability using very low power handheld portable radios is much poorer than the talk-out from a high power transmitter at a base location, the primary fire channel has a total often receivers scattered about the County so that personnel using a portable radio can reach a nearby receiver site on the talk-back path. This greatly improves the overall coverage performance of the radio system as a two-way radio system requires the ability to talk both directions, talk-out and talk-back. The single channel serving the three communities in south central Anoka County has only the one receiver at the base transmitter site. There is a dedicated radio operator in the Anoka County Central Communications - 9-1-1 Dispatch Center to serve the fire service needs throughout the County. 2.1.2 Law Enforcement Radio Systems in Anoka County The Anoka County law enforcement agencies utilize five radio channels. Two ofthose radio channels are dedicated for dispatch radio operations purposes. Those two channels are the south main dispatch (Channell, which is a two frequency mobile relay or repeater channel) with a Ronald Vegemast Engineering. Inc. -7- Report: Anoka County