Simoco SRM9000 - Figure 6-6 E0 Synthesiser - VCO Schematic

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Radio A
Programmed Rx
only on 155.350
Radio B
Programmed Tx
only on 147.475
Base Tx on 155.350
and Rx on 147.475
Hill-Party Tx on 155.350
and Rx on 147.475
Half Duplex Operation Using the 155.350 MHz and 147.475 MHz Pair
Portable radios would need to switch to a simplex TWC for handset to handset comms. Using this method, portables cannot normally speak directly to each
other. Repeater defeat can also be programmed onto one of the buttons to allow direct comms between portable radios.