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Icom IC-F521 - Section 4: Circuit Description; Receiver Circuits Overview

Icom IC-F521
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MONITOR KEY
Activates one of (or two of) the following func
-
tions on each channel independently:
Push and hold the key to unmute the channel (audio
is emitted; ‘Audible’ condition).
Push the key to toggle the mute and unmute condi-
tions (toggles ‘Audible’ and ‘Inaudible’).
Push the key to mute the channel (sets to ‘Inaudible’
only).
Push the key to unmute the channel (sets to ‘Audible’
only).
Push the key after the communication is finished to
send a ‘reset code’.
NOTE: The unmute condition (‘Audible’ condi-
tion) may automatically return to the mute
condition (‘Inaudible‘ condition) after a speci
-
fied period.
WIDE/NARROW KEY
Push [W/N] to toggle bandwidth between wide
or narrow.
OUTPUT POWER SELECTION KEYS
Select the transmit output power temporarily or
permanently depending on the pre-setting.
Ask your Dealer or System Operator for the
output power level for each selection.
[MONI]
[W/N]
[H/L]
BANK KEY
Select and determine a bank number.
Push
[BANK] then push [CH UP]/[CH DN] to
select operating bank number, and then push
[BANK] to determine the bank number.
SCAN START/STOP KEY
Push this key to start scanning; and push again
to stop.
NOTE: Place the microphone on hook to
start scanning.
Take the microphone off hook to stop scan
-
ning.
Push and hold this key to indicate the scan
group, then push to select the desired group.
SCAN TAG KEY
Adds or deletes the selected channel to the
scan group.
LOCK KEY
Electronically locks all programmable keys ex
-
cept the following:
[
CALL
] (incl. [CAL A] and [CAL B]), [
MONI
] and
[
EMER
] keys.
[BANK]
[SCAN A]
[SCAN B]
[TAG]
[LOCK]
4
1
PANEL DESCRIPTION

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