Icom IC-F1020 Instruction Manual page 18

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OPTIONAL SmarTrunk II™ OPERATION
D Clear channel alerting
If all channels are busy, the transceiver automatically begins
searching for an open channel and beeps every ten seconds.
When two short beeps (low-pitched, then high-pitched) are
heard, a channel is available. Push [M], [M] immediately to re-
dial the last number.
NOTE: For additional operating instructions, contact your
dealer or system operator.
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