| 摘要 |
An automatic channel scanning attachment is described for connecting to a CB radio transceiver having a manual channel selection. The attachment is designed to automatically manipulate the manual channel selector to scan the channel to select an active channel. The attachment includes a separate chassis having a wire for connecting to the transceiver squelch circuit to receive a squelch signal. The attachment includes a signal polarity network for producing a process signal of a desired polarity in response to a squelch signal of an unknown polarity. The process signal activates a scanning control network to generate a scanning signal that may be time delayed with respect to the squelch signal. The scanning signal is used to activate a selector actuator means to manipulate the manual channel selector to scan the channels until an active channel is found.
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