IFR COM-120C User Manual

5-24
SECTION 5
COMMON PRACTICES
5-2-3 RECEIVING PM MODULATED RF SIGNAL
This procedure configures the RF Receive Operation Screen to receive a Phase
Modulated RF Signal at the ANTENNA Connector.
The transmitted signal has 5 Radians deviation of a 1 kHz sine wave at
-60 dBm level.
The speaker is configured to play the demodulated signal.
P
R
E
P
o Set RF Field to Radio Center Frequency .
o Set Input to
ANT .
o Set Attenuation to
0 dB .
o Set Demodulation Type to
PM .
o Set IF Bandwidth to
300 kHz .
o Cursor to Line Field and press F6
CONFIG .
o Set Mod Meter Filter Line Low-Pass Filter to
20 kHz .
o Set AF Counter Filter Line Low-Pass Filter to
4 kHz .
o Set Speaker/Headphones Filter Line to
W.B. (Wideband).
o Execute and return to RF Receive Operation Screen.
o Adjust VOLUME Control for desired audio level.

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.