Options - 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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4
OPTIONS
SP-22 EXTERNAL SPEAKER
Compact and easy-to-nstall.
Input mpedance: 4 ø
Max. nput power: 5 W
HM-152/HM-152T/HM-148
• HM-152
: Hand mcrophone.
• HM-152T : DTMF mcrophone
• HM-148
: Heavy duty mcrophone
SM-25
Desktop mcrophone.
UT-108 DTMF DECODER UNIT
Provdes pager and code squelch capabltes.
UT-109/UT-110 (#02) VOICE SCRAMBLER UNIT
• UT-109 : Non-rollng type (max. 32 codes)
• UT-110 : Rollng type (max. 1020 codes)
OPC-617 ACC CABLE
Allows you to connect to an external termnal.
17
hand microphone
- 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