Abstract: A multifrequency generator is provided for a radio transmitter and receiver that must operate on a plurality of channels. The generator includes a channel synthesizer having a phase-locked loop that provides a respective output frequency signal for each selected channel. The generator includes a transmitter synthesizer connected to the channel synthesizer and having a phase-locked loop and a mixer that provide the transmitter synthesizer output signal. The generator includes a receiver synthesizer connected to the channel synthesizer and having a phase-locked loop and a mixer that provide the receiver synthesizer output signal. The frequency of the channel synthesizer output frequency is selected to be substantially lower than the transmitter and receiver synthesizer output frequencies to reduce the noise sideband components of the transmitter and receiver output signals.