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radio system. Each system will provide an excellent grade of service in Anoka County except that the stand-alone, analog radio system will have some lesser quality than the MnlDOT system. Lesser qualities of a stand-alone, analog 800 MHz trunked radio system include: . Slightly greater risk of monitoring of an analog radio system than of a digital modulation radio system. . Lesser ability to interoperate with agencies that are subscribers on the MnlDOT digital modulation radio system because of incompatibility for intercommunication between subscriber radios. . Less audio quality in some areas of the County due to the noise background that occurs in fringe areas and inside some structures in an analog radio that does not occur in a digital modulation radio. Selection of the stand-alone, analog 800 MHz radio system alternative will mean that Anoka County would need to arrange to use the 800 MHz radio frequency pairs that have been set aside for use in Anoka County but that are currently licensed by Mn/DOT. Whether one of the two trunked, 800 MHz radio system alternatives or enhancing the existing VHF system alternative is selected, there are several issues which will have to be addressed including: . There are no trunked 800 MHz radio pager receivers and, therefore, the fire radio paging alert system will need to be enhanced in the same way no matter what alternative is selected. . Anoka County public safety entities must be able to receive information from callers who dial 9-1-1 and to receive radio page alerting and at least minimum two-way, land mobile radio communications in order to handle the true emergency incidents. Therefore, a back- up dispatch facility will need to be implemented regardless of the radio system alternative selected. . Additional dispatch center radio operator personnel will be required to handle the dispatch end of two-way, land mobile radio communications with public safety personnel operating in the field regardless of the radio system alternative selected. 3.3 TETRA TECHNOLOGY TETRA is a different form of digital modulation than the APCO Project 25 digital modulation. Both voice and data messages can be sent over a TETRA radio system and there is flexibility in the data transmission rate that can be used. TETRA is an open architecture teclmology and there are at least six manufacturers that produce TETRA radio equipment. All equipment produced by these manufacturers is interchangeable in Ronald Vegemast Engineering, Inc. -26- Report: Anoka County