Operation; TurnNg Power On; Channel SelectOn - Icom IC-F521 Instruction Manual

Vhf/uhf transceiver
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2

OPERATION

■ Turning power ON
q Push [POWER] to turn the power ON.
• A power-up alert tone sounds for about 1 sec. and an openng
message may appear.
w If the transcever s programmed for a start up passcode,
nput dgt codes as drected by your Dealer.
• The keys n the table below can be used for password nput:
• The transcever detects numbers n the same block as dentcal.
Therefore "01234" and "56789" are the same.
KEY
[P0]
NUMBER
e When the "PASSWORD" ndcaton does not clear after
nputtng 4 dgts, the nput code number may be ncorrect.
Turn power off and start over n ths case.
7
[P1]
[P2]
[P3]
0
1
2
3
5
6
7
8
■ Channel selection
Several types channel selectons are avalable, methods
may dffer accordng to your system set up.
NON-BANK TYPE:
Push [CH UP]/[CH DN] to select the desred operatng
channel, n sequence; or, push one of the [
select a channel drectly.
BANK-TYPE:
[P4]
Push [BANK] to select the desred bank number.
4
9
AUTOMATIC SCAN TYPE:
Channel settng s not necessary for ths type. When turnng
the power ON, the transcever automatcally starts scannng.
Scannng stops when recevng a call or when takng the
mcrophone off hook.
] to [CH 4] to
CH 1

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Questions and answers

Paul Stein
January 29, 2025

How to control squech

1 comments:
Mr. Anderson
February 10, 2025

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.

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