113 BASIC OPERATION NB functionThe NB (noise blanker) function removes pulse-type noisewhen USB, LSB or CW mode is selected.➥ Push [NB•AGC] to toggle the NB function ON and OFF.• “NB” appears when the NB function is in use. AGC functionThe AGC (Automatic Gain Control) function controls receivergain to produce a constant audio output level even when thereceived signal strength is varied by fading, etc.➥ Push [NB•AGC] for 1 sec. to toggle the AGC function ONand OFF.• “AGC” appears when the AGC function is in use. VSC function [The VSC (Voice Squelch Control) function opens the squelchonly when receiving a modulated signal. This function is veryuseful while scanning, the VSC pauses only when modulatedsignals are received. Scanning continues when unmodulatedor beat signals are received.q Push [SET•LOCK] to enter set mode.w Push [SET•LOCK] or [S.MW•MW] several times until“VSC” appears.e Rotate [DIAL] to toggle the VSC function ON and OFF.r Push [TS•MODE] to exit set mode.• “VSC” appears when the VSC function is in use.[TS•MODE][DIAL][S.MW•MW][SET•LOCK][NB•AGC][NB•AGC]

PANEL DESCRIPTION

I Function display

q Antenna

SETTING A FREQUENCY

I Tuning step selection

BASIC OPERATION

I Squelch attenuator

MEMORY OPERATION

I Programming a memory channel

I Programming channel names

I Copying memory contents

I Memory clearing

I Memory bank selection

SCAN OPERATION

I Scan start/stop

I Scan edges programming

I Skip channel/frequency setting

PRIORITY WATCH

POCKET BEEP AND TONE SQUELCH

I Tone/DTCS squelch operation

SET MODE

I Speciﬁcations

I Options

Icom IC-R1500 Instruction Manual

LOGIC UNIT

MAIN-A UNIT

PLL CIRCUITS

DIGITAL MODE OPERATION WITH UT-122

POWER SUPPLY CIRCUITS

CPU PORT ALLOCATION

PREPARATION

MAIN-A UNIT ADJUSTMENT

MAIN-B UNIT ADJUSTMENT (PCR2500 only)

main unit

top view

IC-R1500

Rear panel connection

panel description

Function display—controller

Rear panel—main unit

Mode selection

Tuning step selection

Receive mode selection

Monitor function

Attenuator function

AFC function

IF ﬁlter selection

Duplex operation

Memory channel selection

Programming a memory channel

Programming channel names

Copying memory contents

memory operation

Memory clearing

Memory bank setting

Memory bank selection

scan operation

Scan start/stop

Scan edges programming

Skip scan

Scan resume condition

pocket beep operation

Tone/DTCS squelch operation

Tone scan

Set mode items

set mode

Weather channel operation

DATA cloning

Partial reset

Internal audio switch

troubleshooting