I Adjusting The Squelch Level; I Backlighting Function; I Voice Scrambler Operation - Icom IC-M72 Instruction Manual

I Adjusting the squelch level

To adjust the IC-M72's squelch level, use the [Y Y ]/[Z Z ] keys as
desired below. In order to receive signals properly, as well as
for the scan to function effectively, the squelch must be ad-
justed to the proper level.
q Push [ ], then adjust the squelch level with [Y Y ]/[Z Z ].
- "SQL" and the squelch level are displayed.
- There are 11 squelch levels to choose from: OP is completely
open; 10 is tight squelch; 1 is loose squelch level.
- When no key is pushed for 5 sec., the transceiver returns to
normal condition.
w Push [
] again to return to normal operating mode.
Push

I Backlighting function

This function is convenient for nighttime operation. The back-
lighting can be turned OFF in the SET mode. (p. 19)
➥ Push any key other than [PTT] to turn the backlighting ON.
• The backlighting is automatically turned OFF after 5 sec. of
inactivity.
Shows the squelch
level.
Appears during squelch
level adjustment

I Voice scrambler operation

(available with some versions only)
D Activating the scrambler
The voice scrambler provides private communications. In
order to receive or send scrambled transmissions, you must
activate the scrambler function first.
q Select an operating channel other than Channel 16, 70 or
weather channels.
w While pushing and
holding [ ], push
[SCAN•DUAL].
• "SCRM" appears.
e To turn the scrambler
function OFF, repeat
step w.
• "SCRM" disappears.
D Programming scramble codes
There are 32 codes
(1 to 32)
the code in the SET mode. In order to understand each other,
all transceivers in your group must use the same scramble
code, as well as the same scrambler unit. See p. 22 for
"Scrambler code" setting details.
BASIC OPERATION
Appears when the voice scrambler
function is in use.
available for programming. Set
4
4
11