Ericsson LZT-1872R1A - Manual (Page 21)

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The user can choose to terminate duplex
operation and still maintain the interconnect call in
progress by pressing F followed by 5. This key
sequence toggles between simplex and duplex
operation.
*/System Key usage
The */System ramp button is used in
multiple contexts. When pressed while in monitor
mode (i.e. radio is not in a special or interconnect
call) the radio ramps through available systems in
one direction. If
F followed by */System is
pressed, system ramping takes place in the opposite
direction. If this key is pressed after any key other
than F the * is returned.
CLR key Usage - Last Digit Clear And Display
Clear
To clear the last digit entered in the display,
momentarily press C. To clear the entire display,
press
C
and hold for at least one second.
For functions without associated icons the
current status is displayed by pressing F 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 O to signify that the
current activity has ended.
Additionally, if the radio is programmed as a
supervisory radio, the C key can be used to
terminate activity, i.e. clear emergencies CF
A, B, or C for 2 seconds), drop calls, etc.