作者: William Nelson Furman , Charles Allen Linn , Thomas Gerard Kenney , Michael Andrew Wadsworth
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摘要: A device and method for controlling HF single side band radio squelch operation in which a serial tone burst indicates the start end of transmission identifies an on-going transmission. Additionally, receivers power saving sleep mode can be activated by receipt set bursts that have been transmitted with sufficient duration receiver to assured opportunity detect them. During subsequent information, "keep-alive" are at random time intervals. The is signalled another bursts. provided signal on its frequency preserve bandwidth.