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<br /> Bridging devices in disparate bands Page 2 of 5 <br /> specific geographic areas. The users of these channels must fie eligible for licensing on other 800 MHz <br /> public-safety channels, but no special licensing is required. <br /> Operation on Common Channels -The feve common channels are only to be used for activities <br /> requiring intersystem communications between entities not already sharing communications systems <br /> and are not to be used <br /> for any daily operations. In emergencies, the channels may be assigned by the <br /> primary public-safety agency in that area. On all common channels, plain English and familiar words <br /> and phrases should be used. The calling channel is used to establish contact with other users and <br /> determine which tactical channel to use. It is not to be used as an ongoing working channel. Tactical <br /> channels are reserved for interagency communications and are used as directed by the primary public- <br /> safety agency in the area. Tactical channels can be assigned by the various public-safety services, or <br /> they can be assigned by county or area. <br /> Network Operating Method -A wide area network will be established on the National Calling <br /> Channel. The tactical channel communications systems will be implemented by volunteer entities, and <br /> each primary geographic section of the region is covered by at least one tactical channel. <br /> Coded Squelch on Mutual-Aid Channels -The National Common Tone Squelch of 156.7 Hz will be <br /> used on all equipment operating on the,rve common channels. <br /> If these frequencies are used nationally, as the plan requires, then interoperability comes down to <br /> providing a link or bridge from public-safety radio systems operating in bands other than 800 MHz. In <br /> Figure 2, a conventional VHF radio is interconnected to a conventiona1800 MHz radio to form a <br /> translator. The function of the translator is to receive radio transmissions on the 800 MHz system and <br /> retransmit (translate) them over the VHF radio system. The translator works bidirectionally - that is, it <br /> also picks up radio transmissions on the VHF radio system and retransmits them through the 800 MHz <br /> radio. <br /> http://iwce-mrt.com/microsites/magazinearticle.asp?mode=print&magazinearticleid=198420... 6/24/04 <br /> <br />