faq's
    • the receiver changes channels until it receives radio waves from the sender. for this reason, the transmission side must keep sending the preamble until the receiver detects the transmitted channel. therefore, taking into account the number of channels to search for radio waves, a long preamble is required. also, if there is only a radio wave, the receiving side may make an erroneous channel determination based on radio waves from other systems. for this reason, it is necessary to consider the "criterion for presence of radio waves (bit synchronization information, etc.)" that uses signals other than radio waves.

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