Abstract: A communication transceiver is described which can permit operation of the transceiver unit in either the trunked dispatch mode or in the cellular mode. The ability to utilize two sets of frequencies with different transmitter channel separation can be accomplished by providing a phase lock loop configuration with a signal having a frequency that is the separation between the transmit channels of the selected communication system or is a fraction thereof. Similarly, a controllable reference oscillator frequency is forced through the phase locked loop configuration, to provide a signal for which a the frequency multiple of the difference frequency for the selected communication mode and is the frequency of the channel. A scaling network provides a signal for the phase lock loop that, for the correct frequency of a controllable oscillator, is the difference between the transmitter or receiver channels.