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Bridging devices in disparate bands Page ] of 5 -N±AA#'rP Lti ?J4i-aoL:WS Oh'0.-SE{URdIYIt.lt Ltk:f Yet f ~ M~r..rrxf iveete~ Bridging devices in disparate bands By Harold Kinley Mobile Radio Technology, May 1, 2004 Despite the steady migration ofpublic-safety radio organizations to 800 MHz trunking systems over the past few years, many public-safety radio systems still operate in the VHF and UHF bands. Fortunately, the national frequency plan developed by the National Public Safety Planning Advisory Committee and adopted by the Federal Communications Commission in 1987 calls for certain 800 MHz frequencies to be set aside for the purpose of interoperability - or "mutual aid" -between public-safety entities operating in various frequency bands. To review the requirements and objectives, I have excerpted a portion of Appendix C of NPSPAC's Channel Planning Analysis, as follows in the next section. (Visit www.pswn.gov/admin/librarydocs/800appendixc.pdf for the full document.) The national plan requires that regional plans contain several sections concerning the implementation of the fave nationwide mutual-add channels. These sections typically define the use of each of these channels and provide detailed standards and operating procedures to govern the use of these channels. Common Channel Implementation -The national plan sets forth the guidelines_for using and implementing the five National Common Channels (see Figure 1). Four of these channels are dedicated as National Tactical Channels and one channel is dedicated as the National Calling Channel. The National Common Channels are to be available for use throughout the region. The National Calling Channel, channel 601, is to be dmplemented as a full mobile relay, with wide area coverage transmitters to maximize coverage. Large system users eve or more channels) are required to monitor thds channel and could be required to provide satellite receiver feeds into the wide coverage area. f~atmel Y M~n.._ . - 11M~ ~ ~ ~ . 521.41 411a'~ _ 3 ;.2;° TAC3>. The four National Tactical Channels are to be assigned throughout the region for use by all eligible entities. Large system users could be required to sponsor one or two localdzed mobile relays to cover ATT. J http://iwce-mrt.com/microsites/magazinearticle.asp?mode=print&magazinearticleid=198420... 6/24/04