| 摘要 |
A low average power animal restraining system and method has a radio frequency transmitter for generating a carrier signal, an antenna for radiating the carrier signa, a radio frequency receiver, adapted to be placed on the animal. The receiver has an animal stimulation mechanism for providing a warning to the animal in response to a signal received from the transmitter. Power required to operate the transmitter is reduced by (1) amplitude modulating the carrier signal with a low frequency signal having a low duty cycle, (2) discontinuing the carrier signal for periods of time, or (3) reducing the pulse width of the carrier signal.
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