| 摘要 |
The communications system of the present invention comprises a pair of transceivers (10, 10a) and an appropriate transmission medium. A "ring-around" configuration provides a closed loop carrier between the transceiver pair (10, 10a). To exchange information a carrier may be modulated by conventional amplitude or frequency methods. Oscillation occurs between the pair of transceivers when the total round trip gain due to amplifiers (12) exceeds unity and the total phase shift due to the delay lines (16) and circuit delays is 360 degrees. Modulation applied to the carrier at either transceiver will be detectable at both. Demodulation can take place at any point on the signal path within one of the transceivers. |
