[BANK]
BANK KEY
Select and determne a bank number.
• Push [BANK] then push [CH UP]/[CH DN] to
select operatng bank number, and then push
[BANK] to determne the bank number.
[SCAN A]
SCAN START/STOP KEY
[SCAN B]
Push ths key to start scannng; and push agan
to stop.
NOTE: Place the mcrophone on hook to
start scannng.
Take the mcrophone off hook to stop scan-
nng.
Push and hold ths key to ndcate the scan
group, then push to select the desred group.
[TAG]
SCAN TAG KEY
Adds or deletes the selected channel to the
scan group.
[LOCK]
LOCK KEY
Electroncally locks all programmable keys ex-
cept the followng:
• [
] (ncl. [CAL A] and [CAL B]), [
CALL
[
] keys.
EMER
[MONI]
[W/N]
[H/L]
] and
MONI
PANEL DESCRIPTION
MONITOR KEY
Actvates one of (or two of) the followng func-
tons on each channel ndependently:
• Push and hold the key to unmute the channel (audo
s emtted; 'Audble' condton).
• Push the key to toggle the mute and unmute cond-
tons (toggles 'Audble' and 'Inaudble').
• Push the key to mute the channel (sets to 'Inaudble'
only).
• Push the key to unmute the channel (sets to 'Audble'
only).
• Push the key after the communcaton s fnshed to
send a 'reset code'.
NOTE: The unmute condton ('Audble' cond-
ton) may automatcally return to the mute
condton ('Inaudble' condton) after a spec-
fied perod.
WIDE/NARROW KEY
Push [W/N] to toggle bandwdth between wde
or narrow.
OUTPUT POWER SELECTION KEYS
Select the transmt output power temporarly or
permanently dependng on the pre-settng.
• Ask your Dealer or System Operator for the
output power level for each selecton.
1
4
Need help?
Do you have a question about the IC-F521 and is the answer not in the manual?
Questions and answers
How to control squech
The squelch on the Icom IC-F521 is controlled by a noise squelch circuit. This circuit detects noise components in the AF signals and switches the AF mute switch accordingly. The squelch level is managed by a level controller (IC6, pins 21, 22), which processes signals from the FM IF IC (IC1, pin 9) and applies them to an active filter section (IC1, pin 8). Noise components around 10 kHz are amplified and converted into pulse-type signals by the noise detector section.
This answer is automatically generated