| 摘要 |
<p>SKIRT-TUNED SINGLE OSCILLATOR TRANSCEIVER A transceiver, adapted for use as either a master or a slave in a duplex pair, has a single, voltage-tunable, solid state oscillator to provide the carrier frequency wave, a small portion of which is mixed with the received wave and applied therewith to a single ended mixer; an AGCcontrolled loop cancels transmitter input modulation from the receiver output. The oscillator of the slave transceiver is locked to a desired carrier frequency by a feedback loop including a tuning cavity adjusted to the same frequency as that of the master transceiver; the slave transceiver is first locked to a frequency on the skirt of its tuning cavity, differing from the center frequency of its tuning cavity by the common IF frequency and thereafter, upon sensing output from its IF amplifier (from the master), is switched to operate in response to AFC controlled by the received signal, such that the master and slave transceivers are locked together at frequencies differing by their common IF frequency. A single integrating amplifier provides demodulator and AFC filtering and, together with a unilaterally-effective bistable device, initial sweeping of the oscillator control voltage to achieve skirt tuning in the slave mode or center tuning in the master mode.</p> |
