| 摘要 |
A phase locked loop type transmitter-receiver having a phase locked loop type synthesizer including a circuit in which a programmable counter, a phase discriminator, a low-pass filter, a voltage-controlled oscillator and a mixer are connected in a closed loop; wherein the mixer is connected to a reference oscillator connected to the phase discriminator through a fixed frequency divider, the mixer being adapted to mix frequencies fed from the reference oscillator and the voltage-controlled oscillator thereby synthesizing sum and difference signals thereof, the difference signal being fed to the programmable counter and the sum signal being fed to a transmitting-side mixer and a receiving-side mixer.
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