Eventually I'll write a description of the repeater, but for now here's the block diagram. Note that the repeater logic and FIFO is in the modem. No external logic is required. The 29 mhz filters were required at the Sweat Mtn. site to enhance the isolation above that provided by the Sinclabs 222 mhz duplexer. These were not required for the Lanier Mtn. site which uses a 5 mhz split ( 445.150 / 440.150 mhz) . A Motorola 4 cavity band pass/reject duplexer provided enough isolation.
