DIGITAL RADIO RELAY SYSTEM COMPRISED

Brand	Owner	Address	Description
71DR	MPR TELTECH LTD.	8999 Nelson Way Burnaby, British Columbia V5A 4B5 Canada	digital radio relay system comprised of base band interface units, modulator and de-modulator units, amplifiers, radio frequency branching networks, and software for monitoring, controlling and reporting system operations;
	Where the owner name is not linked, that owner no longer owns the brand

Technical Examples

A security system for a digital trunked radio system having a digital control channel and a plurality of working channels, wherein said working channels are assigned for temporary use of individual radio units by digital control signals transmitted over said control channel, said control channel carrying digital control signals between a base site and said radio units, comprising a digital key, said key used to limit access to the system equipment and system control channel transmissions.