I Adjusting The Squelch Level; I Automatic Backlighting; I Voice Scrambler Operation - Icom IC-M90 Instruction Manual

I Adjusting the squelch level

To adjust the IC-M90's squelch level, use the [Y]/[Z] keys as
desired below. In order to receive signals properly, as well as
for the scan to function effectively, the squelch must be adjusted
to the proper level.
q Push [SQL•
], then adjust the squelch level with [Y]/[Z].
MONI
- "SQL" indicator starts blinking.
- There are 11 squelch levels to choose from: OP is completely
open; 10 is tight squelch; 1 is loose squelch level.
- When no switch is pushed for 5 sec., the transceiver returns to
normal condition.
w Push [SQL•
] again to return to normal condition.
MONI
Push
I Backlighting function
This function is convenient for nighttime operation. The back-
lighting brightness can be adjusted in the SET mode. (p. 18)
➥ Push any switch except for [PTT] to turn the backlighting
ON.
• The backlighting is automatically turned OFF after 5 sec. of
inactivity.
Blinks during the squelch
level adjutment.
Indicates the
squelch level.

I Voice scrambler operation

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 except Channel
16, 70 or weather chan-
nels.
w While
pushing and
holding [SQL• ],
MONI
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) available for programming. Set
the code in the SET mode. In order to understand each other,
all transceivers in your group must have the same scramble
code, as well as the same scrambler unit. See p. 20 for "Scram-
bler code" setting details.
BASIC OPERATION
Appears when the voice
scrambler function is in use.
4
4
11