Direct modulating FSK transmitter for MCA

摘要

A direct modulating frequency shift keying transmitter for multi channel access is constructed so that a transmission signal from a voltage controlled oscillator (VCO) in a phase lock loop frequency synthesizer is output through a buffer amplifier and a transmitting power amplifier, and a modulation signal is applied to the VCO. In the transmitter, in order to cancel instantaneous deviation of a transmission frequency due to ON of the transmitting power amplifier, an ON/OFF control signal is applied to the transmitting power amplifier.