IMPORTANT
READ ALL INSTRUCTIONS
pletely before usng the transcever.
SAVE THIS INSTRUCTION MANUAL —
nstructon manual contans mportant operatng nstructons for
the IC-F521 VHF TRANSCEIVER and IC-F621 UHF TRANS-
CEIVER.
EXPLICIT DEFINITIONS
WORD
Personal njury, fre hazard or electrc
RWARNING
shock may occur.
Equpment damage may occur.
CAUTION
If dsregarded, nconvenence only. No rsk
NOTE
of personal njury, fire or electrc shock.
Icom, Icom Inc. and the
Icom Incorporated (Japan) n the Unted States, the Unted Kng-
dom, Germany, France, Span, Russa and/or other countres.
carefully and com-
Ths
DEFINITION
logo are regstered trademarks of
PRECAUTIONS
RWARNING! NEVER
AC outlet. Ths may pose a fire hazard or result n an electrc
shock.
RWARNING! NEVER
power source of more than 16 V DC such as a 24 V battery.
Ths connecton wll run the transcever.
RWARNING! NEVER
tween the DC plug and fuse holder. If an ncorrect connec-
ton s made after cuttng, the transcever mght be damaged.
RWARNING! NEVER
normal operaton of the vehcle may be hndered or where t
could cause bodly njury.
CAUTION! NEVER
allow chldren to touch the trans-
cever.
CAUTION! NEVER
expose the transcever to ran,
snow or any lquds.
USE
suppled or optonal mcrophone only. Other mcro-
phones have dfferent pn assgnments and may damage the
transcever.
DO NOT
use or place the transcever n areas wth tem-
peratures below –22°F (–30°C) or above +140°F (+60°C), or
n areas subject to drect sunlght, such as the dashboard.
connect the transcever to an
connect the transcever to a
cut the DC power cable be-
place the transcever where
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