United States Patent: 5,815,799
Link ID 193249
Title United States Patent: 5,815,799
Url http://164.195.100.11/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=/netahtml/search-adv.htm&r=1&p=1&f=G&l=50&d=ft00&S1='EF+Johnson'&OS=
Description Priority system for a wide area transmission trunked communication system. Here is the LTR Multi-Net Patent that explains the signaling protocol.
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Date Jul 19, 2006
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 Other links at
1. Nighthawk Communications, Inc.
  Offers VHF and UHF wide area LTR System, sales, rentals and repair services in the Los Angeles area.
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2. NIC Technologies
  Independent service provider of radio communication systems specializing in trunked radio and wireless point-to-point systems.
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3. TETRA
  Forum representing users, manufacturers, operators, test houses and telecom agencies for terrestrial trunked radio, an open digital trunked radio standard defined by the European Telecommunications Standardisation Institute .
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4. Trunking Information
  Information on several Motorola systems, the EDACS system which is operated by the City of Clearwater, as well as conventional frequencies for the Greater Tampa Bay Area.
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5. United States Patent: 5,822,314
  Communications system and method of operation. A typical operational function, using timing information inherent in the transmissions, is the encryption/decryption process within the Trans European Trunked Radio (TETRA) standard.
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