Alinco DJ-S40 - Manual (Page 34)

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7.Special Functions
7-1-2 Alarm
When the cable is pulled out or cut, the alarm will start sounding.
While alarming, all of the key operations are disabled including the power switch.
However, receiving is activated on the frequency recorded in the CH-SC (alarm
channel).
■ How to Stop the Alarm
When a signal is received and the squelch is unmuted during the alarm, the
alarm is canceled and the unit returns to the "receive" mode (A TSQ setting is
also a valid squelch setting).
It is possible to cancel the alarm using another transceiver from a remote place.
1. To cancel the alarm, detach the battery pack.
2. To set the alarm again, attach the battery pack and turn the power OFF.
Caution: Use the same battery pack that was in place when the alarm
function was activated (if an external power supply is used, the
alarm will continue sounding).