234 BASIC OPERATION [DIAL] function assignmentThe frequency control dial can be traded with an audio volumecontrol dial or [YY]/[ZZ] keys to suit your preference.➥ Push [1 DIAL] for 1 sec. to toggle the dial function from tun-ing dial and audio volume.• “∂ ” appears when [YY]/[ZZ] function as an tuning dial.• Single band operation• Dualwatch operation√MODE ANLAFCTSQLFM146 560PSKIP-DUP∂145 250438 000AFC -DUP-DUPFMTSQLTSQLPSPSPRIOPRIOFM0000000000FM[R-DIAL][L-DIAL]DIAL.SEL1“ √ ” indication “ ∂ ” indicationFrequency, Memory channel, Audio volume[R-DIAL] Squelch level, Scanningdirection, Set mode itemand condition setAudio volume set Frequency, Memory channel,[L-DIAL] Squelch level, Scanning[Y]/[Z] direction, Set mode itemand condition set“ ” indication “ ” indicationFrequency, Memory channel, Audio volume[R-DIAL] Squelch level, Scanning[L-DIAL] direction, Set mode itemand condition setAudio volume set Frequency, Memory channel,[Y]/[Z] Squelch level, Scanningdirection, Set mode itemand condition set

dualwatch operation

supplied accessories

quick reference guide

charging the battery

I Front, top and side panels

panel description

I Function display

I Battery installation

I Caution

I Mode selection

I Operating band selection

I Setting a tuning step

I Receive mode selection

I Receiving

I Squelch level setting

I Attenuator function

I Duplex operation

I AFC function

I Band scope

I [DIAL] function assignment

I Setting audio volume

I Main band selection

I General description

I Memory bank setting

I Memory bank selection

I Programming memory/bank name

I Selecting memory/bank name indication

I Copying memory contents

I Memory clearing

I Erasing/transferring bank contents

I Scan types

I Full/band/programmed scan

I Scan edges programming

I Memory/bank/all bank scan

I Auto-memory write scan

I Skip channel/frequency setting

I Scan resume condition

scan operation

I Priority watch types

I Priority watch operation

I Tone/DTCS squelch operation

ting

I DTCS polarity setting

tone scan

set mode

I Set mode items

I Antenna selection

I Weather channel operation

i data cloning

I Auto power-off function

other functions

I Partial reset

I General

I TV channels

frequency table

I Weather channels

other communications in the usa

I Other communications— other countries

MAINTENANCE

SPECIFICATIONS

Icom IC-R20 Instruction Manual

specifications

IC-R20

frequency range

belt clip

basic operation

programmed scan operation

Front, top and side panels

Function display

Battery installation

Caution

Mode selection

Operating band selection

Setting a tuning step

frequency and channel setting

Receive mode selection

Setting audio volume

Squelch level setting

Attenuator function

Duplex operation

AFC function

Band scope

DIAL] function assignment

Band exchange

Memory channel programming

Memory bank setting

Memory bank selection

Programming memory/bank name

Selecting memory/bank name indication

Copying memory contents

Memory clearing

Erasing/transferring bank contents

Scan types

Full/band/programmed scan

Scan edges programming

Memory/bank/all bank scan

Auto-memory write scan

Skip channel/frequency setting

Scan resume condition

Priority watch types

Priority watch operation

priority watch

Tone/DTCS squelch operation

dtcs polarity setting

General

Set mode items

Antenna selection

Weather channel operation

Data cloning

Partial reset

Data format

control command

VHF marine channels

Other communications in the USA

troubleshooting

OPTIONS

driver installation

POCKET GUIDE

service manual

bottom view

logic unit

disassembly instructions

receiver circuits

pll circuits

other circuits

power supply circuits

software adjustments

main unit

explanatory notes

disassembly information

bc-156 voltage diagram

bc-156 board layouts

parts list

PARTS LIST

BOARD LAYOUTS

VOLTAGE DIAGRAM

UNIT LAYOUTS