To support two simultaneous conversations on the same frequency, the repeater uses Time Division Multiple Access (TDMA) technology. During normal operation, the SCHEART DMR network is integrated with the NCPRN network, and the wide area talk group (PRN) covers South Carolina, North Carolina, parts of adjacent states. Each repeater is configured to support a full-time local talk group and a wide area talk group. DMR repeaters support two simultaneous voice/data conversations on a single frequency pair. Authorized talk groups for use on SCHEART DMR are listed on the SCHEART web site at under the Digital drop-down tab. ![]() ![]() Talk groups are unique digital identifiers that help route conversations through the network and into the user’s radio. The DMR repeater system provides amateur radio operators access to a commercial level radio network whose operation is based on talk groups rather than just frequency channels.
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