2000-11-08 Packet - Laserfiche WebLink

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3.1.1 Congestion If it is decided that existing systems should be enhanced as a way of overcoming many of the deficiencies in two -way land mobile public safety radio systems in Anoka County, then the issue of congestion must be addressed. The existing congestion can be relieved if at least five additional radio frequencies can be licensed for use by public safety entities in the County. Those five frequencies will be needed for the following uses: • Two additional radio frequencies for one more law enforcement mobile relay or repeater dispatch channel. This is necessary as three law enforcement dispatch radio operators, each using a separate two frequency mobile relay radio channel, are needed from 1500 to 2300 every day. • Two additional radio frequencies for one more mobile relay or repeater law enforcement administrative channel. • One more frequency to be paired with the existing County fire frequency to make a mobile relay or repeater pair. This would greatly reduce any covering of transmissions that occurs when one person begins transmitting while someone else is already transmitting because the second person could not hear that the first person was already transmitting on the channel. With the existing simplex county -wide fire channel, there is little danger from potential jamming as the jamming is being performed by a person in a vehicle driving around and that jamming would only affect listeners in the vicinity of the jammer. If the fire service in Anoka County were to implement a mobile relay or repeater channel, the jammer could jam the system county -wide by putting his jamming transmitter on the mobile relay input frequency. This could be relieved for paging purposes if the dispatcher were to disable the repeat function if the channel is being jammed on the input frequency and still do the paging on the output frequency where jamming is not occurring. In addition to the five radio frequencies needed immediately, it is probable that at Least four more radio frequencies will be needed, probably within five years. Those frequencies would be needed for the following purposes: • Two additional frequencies for a mobile relay or repeater pair for an additional county- wide law enforcement tactical channel. Additional tactical radio facilities are required because of the rapidly growing rate of law enforcement activity as the population of the County continues to grow and as the County becomes more urbanized. 3 A single frequency simplex frequency will be required to permit firefighter personnel to monitor what is happening without that monitoring going on on the dispatch channel. • The fire service will most likely require a fourth fire scene tactical channel in the future. This means that within about five years, public safety agencies in Anoka County will need a minimum of nine additional high -band, VHF radio frequencies in order to relieve congestion Ronald Vegemasi Engineering, Inc. -22- Report Anoka County