Icom IC-M501 Operational Manual page 23

Select Reason with main dial knob, and repress DSC/ENT button
Contents of Reason selection
After holding DSC/ENT button for 5seconds, the radio will transmit Individual ACK
After transmission is completed, the radio will back to user channel
IC-M501
70
Readout for Reason
reason given
Congestion
Busy
Queue indication
Station barred
No operator
Equipment disable
Unable channel
Unable mode
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