RADIO COMMUNICATION SYSTEM OF FULL DUPLEX COMMUNICATION SYSTEM USING A SINGLE VOLTAGE CONTROLLED OSCILLATOR

摘要

The system includes a duplex filter (21), a low noise amplifier (22), a transmission data and audio input means (C,D), a VCO (voltage controlled oscillator) connected to the means (C,D) to generate frequencies for mixing the transmission signals, a freq. divider (29), a freq. mixer (30), a charge pump (31), a low pass filter (32), a buffer amplifier (26), a 1st intermediate freq. amplifier (24), a 2nd local oscillator (27), a 2nd mixer and demodulator (25), a modulated components removing means (40) connected to the parts (C,D,25), an audio and data output means (A,B) for saparating the received signals into audio and data signals, a buffer amplifier (33), and a power amplifier (34). The system uses a single VCO to perform the radio communications of full duplex method.