General Electric Company

Peyton L Morgan, Iii

Jeffrey S Childress

Michael W Smith

Mark M Sihlanick

An arrangement for establishing communication between a first mobile radio transceiver and a second mobile radio transceiver through a repeater over a radio frequency channel selected from a plurality of such channels. A repeater distinguishes between two-tone signalling sequences and four-tone signalling sequences by determining the arrival rate over some predefined interval of a received signalling sequence. The repeater transmits a busy signal to alert mobile stations seeking to acquire a channel that the repeater is busy. The repeater interrupts the transmitted busy signal during a portion of the four-tone signalling sequence but not the two-tone signalling sequence to help prevent two-tone mobile stations from falsing on four-tone signalling sequences. The arrangement is thus made compatible with both two-tone signalling and four-tone signalling formats. A calling mobile transceiver may specify the length of signalling transmitted by the repeater, so that the mobile transceiver can cause the repeater to transmit signalling for a duration longer than the mobile transceiver itself would require.

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Lynchburg, VA, United States of America

Peyton L Morgan, Iii