| 摘要 |
PURPOSE:To stabilize the oscillating output of a slave station by a high-stable oscillator of a master station by controlling the local oscillator of a slave station with a signal transmitted from the master station in a time division multi- direction communication network connecting the master station and plural slave stations in terms of time division. CONSTITUTION:A signal inputted from an input terminal RF In is mixed with an output of a local oscillator by a mixer MIX in a slave station receiver receiving an FSK modulation wave from the master station and attains to an intermediate frequency signal via a band pass filter BPF1. This signal is multilied by (n) at a multiplier MULT, inputted to a frequency discriminator DISC via a band pass filter BPF2, an output in response to an input frequency is amplified by an amplifier AMP and inputted to a voltage controlled oscillator VCO as an oscillated frequency control signal. Since the carrier is extracted while bringing the modulation index to 1 by means of n-multiplication, the output is controlled stably without providing the highly stable oscillator to the slave stations. |
