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OFFICE OF THE ADMINISTRATOR r Center A-2300 Government Minneapolis, Minnesota 55487 FW1:MK1VP1N ij U May 3, 1982 Mr. David M. Childs St. Anthony City Manager 3301 Silver Lake Road Minneapolis, MN 55418 Dear Mr. Childs: The purpose of this letter is to serve as a progress report on the upgrading of the Hennepin County Public Safety radio communications system that is operated by the Sheriff's Department. The Hennepin County Board Resolution (82-3-84R) that established emergency public safety radio communications as a County function and responsibility, without charge for emergency dispatching services, was passed on March 16, 1982. Since that time, members of the Sheriff's Department, Information Services Department and the Office • of Planning and Development have been meeting to provide preliminary implementation plans for the various directives in the Resolution. Specific progress that has been accomplished to date includes the following items: • In an attempt to eliminate the congestion on the main law enforcement dispatch radio channel(155.61 MHz), the County has been divided into a North dispatch zone and a South dispatch zone, with Highway 55 serving as the approximate North-South dividing line. The south dispatch zone will continue to use 155.61 MHz as the dispatch channel; the north zone will use 154.8 MHz as the dispatch channel. Both segments will use mobile relay (repeater) type of operation, a network of satellite receivers and a receiver voting system. All base equipment is now installed and operational; most of the mobile radios are also installed and operational. Captain Donald Vodegel of the Sheriffs Radio Division advises that operational tests on the new north repeater channel will begin by June 1, 1982. When the second dispatch zone is fully operational (in a few months), the radio traffic load on 155.61 MHz will be cut in half. This impending improvement will do much to eliminate the serious problem of overcrowding on the main public safety radio dispatch channel. 9 As directed by the Board Resolution, representatives of the Sheriff's Radio Division and the Communications Division of the Information Services Department are developing an Action Plan to remove administrative radio traffic from the main public safety dispatch channel, which is intended to further reduce congestion on the main • radio dispatch channel(s). HENNEPIN COUNTY an equal opportunity employer