IFR COM-120C User Manual

1-3
SECTION 1
INTRODUCTION
1-3 RF RECEIVE OPERATION
Receiving
The COM-120C receives CW and modulated signals ranging from 250 kHz to 1000 MHz.
In addition to single frequency operation, the COM-120C demodulates and detects AM,
FM and PM modulated signals and executes defined frequency sweep operations by
scanning a range of predetermined Frequency List settings.
The COM-120C receives “off-the-air” signals via the Antenna Connector or connects
directly to the Unit Under Test via the T/R Connector.
Meters
Receive Operation Metering functions include RF Power, AM Modulation, FM Deviation,
Phase Modulation, Distortion, Frequency Error, AF Frequency, Received Level and
SINAD.
Full Oscilloscope and Spectrum Analyzer operation is available.
Testing
Testing in RF Receive Operation includes measuring Carrier Power, Modulation,
Distortion, SINAD and RF Frequency Error.
Use the independent Audio/Data/Signaling Generators to
modulate the Unit Under Test when performing RF Receive
Operation.
O
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n

IFR COM-120C Specifications

General

Resolution	1 Hz
RF Input Impedance	50 Ω
Third Order Intercept (TOI)	+10 dBm
Display Type	LCD
Display Resolution	640 x 480 pixels
RF Input Protection	1 W
Power Requirements	100-240 VAC, 50-60 Hz
Input VSWR	1.5:1
Phase Noise	-80 dBc/Hz @ 10 kHz offset

Summary

COM-120C Communications Service Monitor Operation Manual

Preface

Provides an overview of the manual's organization, scope, and intended audience.

Section 1: Introduction

Introduces the COM-120C, its functions, and basic operation modes.

Section 2: Installation

Provides information on preparing the COM-120C for use and operating precautions.

Section 3: Composite Controls

Details front and rear panel controls, screens, soft function keys, and menus for system interaction.

Section 4: Operation Procedures

Covers configuring and performing various operational tests like RF Generate, Receive, and Duplex modes.

Section 5: Common Practices

Offers suggestions for equipment and screen setups for common RF Generate and Receive practices.

Section 6: Options and Features

Describes optional features and accessories for the COM-120C, including testing capabilities.

Safety and Precautions

General Safety Warnings

Covers high voltage equipment hazards, servicing, case removal, and safety identification terms.

Battery Handling and ESD Precautions

Provides warnings for sealed lead-acid battery use and precautions for handling ESD-sensitive parts.

Appendix A: User I/O Connectors and Pin-Outs

Table of I/O Connectors

Details the connector names, types, signal direction, and signal types for COM-120C I/O ports.

Connector Pin-Out Tables

Provides specific pin assignments for MIC/ACC, GPIB, and RS-232 connectors.

Appendix B - Abbreviations

Soft Function Key Descriptions

An alphabetical reference for COM-120C soft function keys and their descriptions.

Appendix C - Repacking for Shipping

Shipping and Repacking Procedures

Details authorization, tagging, container requirements, freight costs, and step-by-step repacking instructions.

Index

Index-1

Alphabetical listing of topics and their corresponding page numbers for easy reference.