Panel Description; Front Panel - Icom IC-F521 Instruction Manual
Vhf/uhf transceiver
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Also See for IC-F521:
- Instruction manual (24 pages) ,
- Service manual (38 pages) ,
- Instruction manual (36 pages)
Table of Contents
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1
PANEL DESCRIPTION
■ Front panel
q AF VOLUME CONTROL KNOB
➥ Rotate the knob to adjust the audo output level.
• Mnmum audo level s pre-programmed.
w LEFT UP/DOWN [∫]/[√] KEYS
➥ One of several functons can be programmed by your
Dealer. (Same as [P0] to [P4] keys)
1
q
w
u
y
e
t
e FUNCTION DISPLAY
➥ Dsplays varety of nformaton, such as an operatng
channel number/name, 2/5tone code, DTMF numbers and
audble condton, etc.
NOTE: The above functons depend on pre-programmng.
r RIGHT UP/DOWN [
]/[
➥ Push to select the operatng channel.
➥ Can be programmed for one of several functons by your
Dealer. (Same as [P0] to [P4] keys)
r
] KEYS
- Quick Links:
- Programmable Function Keys
- Options
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Table of Contents
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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