CLR key Usage - Last Digit Clear And Display Clear
To clear the last digit entered in the display,
momentarily press 
. To clear the entire
display, press and hold 
for at least one second.
For functions without associated icons the
current status is displayed by pressing 
key followed by the desired function. At that time the current state is displayed in the radio's character display. If the state is to be changed, the user must again press the desired function key at which time the new state is displayed. Once the user is satisfied with the selection, let the display expire by
not pressing any keys, or press 
to signify that the current activity has ended.
Additionally, if the radio is programmed as a
supervisory radio, the 
key can be used to
terminate activity, i.e. clear emergencies ( 
A, B, or C for 2 seconds), drop calls, etc.
1/ALERT Key
The horn alert option can be
3)generate a continuous horn blast when a call is received. This function is enabled or disabled by
pressing 
and then 
. Pressing PTT during the alert tone prevents blowing the horn. The horn alert remains enabled for subsequent calls until disabled.
2/Call Timer
The call timer function causes the time duration for the current interconnect call to be displayed. Note that the call timer starts when an interconnect call is initiated. During a conversation the call timer is displaying on the middle line of LCD. The time display is automatically removed
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