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3.1.4 Interoperation Communications Intercommunications between different agencies can be enhanced if agencies begin to put other agency's frequencies into their radios if they remain in the VHF radio band. In addition, as part of the new Mn/DOT radio system there are interoperability facilities between existing interoperability channels and 800 MHz talk groups that would provide for the existing level of interoperability. The new MnlDOT radio system also has two additional VHF interoperability channels in addition to those that exist now and it would be important to add those VHF frequencies to all public safety radios in use in Anoka County if the enhancement of the VHF band is the alternative selected. 3.1.5 Other Needs The interference problem is inherent in the VHF band and interference cannot be relieved. In fact, interference should be expected to increase due to more activity levels on other radio systems that interfere with Anoka County frequencies and if the very narrowband radios are selected as those very narrowband center frequencies will be closer to interfering radio channels from other systems resulting in a higher potential for interference. As more channels are added, there is less chance for jamming as the channel that is being jammed can temporarily be taken out of service and the radio users from that channel can be added to the other channels. There will be increased congestion when that occurs but the jamming tends to be continued for only short periods of time, perhaps 15 minutes, as the jammer does not want to be found. Jamming of radio channels is still a potential problem if the VHF alternative is selected. It is not possible to prevent people from monitoring voice transmissions if the VHF alternative is selected. 3.2 TRUNKED 800 MHz RADIO SYSTEM AL TERNA TIVES A major alternative radio system that may be considered for public safety agencies in Anoka County is the replacement of the entire high-band, VHF radio system with a new trunked radio system operating in the 800 MHz band of radio frequencies. There are sufficient 800 MHz radio frequency pairs available to build an acceptable system for public safety use in Anoka County, and trunked, 800 MHz radio systems are well proven. Use oftrunking technology in the 800 MHz radio band is likely to satisfy the two-way, land mobile radio needs of public safety agencies in Anoka County for many years to come. There are two possible alternative trunked 800 MHz radio system alternatives available for consideration in Anoka County. The first of those is to subscribe for service on the new Minnesota Department of Transportation (MnlDOT) Digital Modulation, Trunked, 800 MHz Radio System; as Hennepin County, Carver County and the City of Minneapolis have elected to pursue. The second alternative is implementation of a stand-alone, trunked, analog 800 MHz Ronald Vegemast Engineering, Inc. -25- Report: Anoka County