D Dtmf Transmission; D Scrambler Function - 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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2
OPERATION
D DTMF transmission
If the transcever has a [
transmsson functon s avalable. Up to 7 DTMF channels
are avalable.
q P ush [
] — a DTMF code channel appears.
DTMF
w Push [CH UP]/[CH DN] to select the desred DTMF chan-
nel.
e Push and hold [
DTMF
9
] key, the automatc DTMF
DTMF
] to transmt the selected DTMF.
D Scrambler function
UT-109 (#02) or UT-110 (#02) optonal voce scrambler unt
provdes hgh performance prvate communcaton between
statons wth the same scrambler codes.
q Push and hold [SCRM] to turn the scrambler functon ON.
• " " appears.
w Push [SCRM] to turn the functon OFF.
• " "
appears.
ds
- Quick Links:
- Programmable Function Keys
- Options
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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