IFR COM-120C

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5-15

SECTION 5

COMMON PRACTICES

00607225

FMMICMod Src:

Dev Range: NAR 3

MIC

Output:

Level:

FL:

RF:

-50.0 dBm

T/R

OFF

(Rcvr Center Frequency)

UUT

ANTENNA IN

Generating Microphone Modulated RF Signal

Main Page

Table of Contents9
Section 1 - Introduction18
General18
Rf Generate Operation19
Rf Receive Operation20
Duplex Operation21
Audio Function Generators22
Oscilloscope23
Spectrum Analyzer24
Meters26
Options27
Com-120C Product Specifications28
Section 2 - Installation42
General42
Precautions42
Power up Procedures44
Applying AC Power44
Applying External DC Power44
Battery Power Operation (Option 01)44
Section 3 - Composite46
Front Panel Controls46
Rear Panel Controls52
Screens, Soft Function Keys and Menus54
Soft Function Keys54
Cursor Movement54
Editing Fields Using Data Scroll Keys and Spinner54
Editing Numeric Data Fields56
Making Selections from Menus56
Escaping from Edit Without Change56
Rf Generate Screen57
Rf Receive Screen59
Duplex Screen62
Oscilloscope Screen65
Spectrum Analyzer Screen67
Audio/Data/Signaling Generators Screen69
Meter Screens70
Memory Lists and Storage of Parameters71
Utility Function Screens72
Section 4 - Operation74
Rf Generate Operation74
General Rf Generate Operation74
Sinad Meter Operation86
Distortion Meter Operation89
Audio Frequency Level Meter Operation91
Oscilloscope Operation Screen93
Spectrum Analyzer Operation Screen98
Store and Recall Operation102
Fm Deviation Meter Operation112
Am Modulation Meter Operation114
Phase Modulation Meter Operation116
Rf Power Meter Operation118
Received Level Meter Operation120
Rf Frequency Error Meter Operation122
Audio Frequency Counter124
Oscilloscope Operation Screen126
Distortion Meter126
Store and Recall Operation126
Duplex Operation127
General Duplex Generate Operation127
General Duplex Receive Operation132
Independent Oscilloscope Operation Screen135
Independent Spectrum Analyzer Operation Screen135
Independent Audio/Data/Signaling Generators136
Audio Generator-1 Operation136
Audio Generator-2 Operation139
Data Generator Operation140
Dtmf Generator Operation141
Meters Operation142
Digital Voltmeter Operation142
Section 5 - Common Practices146
Rf Generate146
Generating Fm Modulated Rf Signal147
Generating am Modulated Rf Signal149
Generating Pm Modulated Rf Signal151
Generating Dcs Coded Rf Signal153
Generating Dtmf Coded Rf Signal155
Generating Rf Signal Using External Modulation157
Generating Microphone Modulated Rf Signal159
Encoding 2-Tone Sequential Format161
RF Receive164
Receiving FM Modulated RF Signal165
Receiving am Modulated RF Signal167
Receiving PM Modulated RF Signal169
Decoding 2-Tone Sequential Format171
Duplex173
Section 6 - Options176
Internal Battery (Option 01)176
Oven Crystal Oscillator Frequency Standard (Option 02)176
30 Khz if FILTER (OPTION 03)176
Variable Audio Generator-2 (Option 04)176
Generate Amplifier (Option 05)176
Data Generator/Bit Error Rate (Ber) Meter (Option 07)177
Ber Meter Configuration Section179
Receive Data Configuration Section181
Send Data Configuration Section183
Single Sideband Receive Filter (Option 08)184
General184
Description of Receive Function184
Rcc Signaling Formats (Option 09)185
Audio/Digital Signaling Formats (Option 11)185
Modulating Rf Signals with Digital Signaling Formats188
Encoding Digital Signaling Formats for Audio Signal190
Decoding Digital Signaling Formats191
Testing a Receiver Using Digital Signaling Formats192
Testing a Transmitter Using Digital Signaling Formats193
Spectrum Analyzer Tracking Generator (Option 12)194
Ieee 488 (Gpib) Interface (Option 13)195
General195
Configuring for Remote Operations Using Gpib195
Clearchannel Ltr ® (Option 14)196
General196
Ltr Trunking Repeater Simulation198
Transmit Trunking Data Block202
Receive Trunking Data Block203
Ltr Trunking Radio Simulation204
Transmit Trunking Data Block208
Receive Trunking Data Block209
Ltr Trunking Auxiliary Setup Screen210
Auxiliary Setup Screen Configuration212
Repeater Simulator Operation213
LTR Radio Handshake Test215
LTR Radio Handoff Test216
LTR Radio Receive Test217
Radio Simulator Operation218
LTR Repeater Handshake Test220
Amps Cellular Testing (Option 15)221
AMPS Cell Site Simulator Setup221
AMPS Cell Site Simulator Main and Setup Menus222
AMPS Cell Site Simulator Automatic Tests227
Registration Test228
Handoff Test232
Audio Test233
Mobile Init Test234
Cell Init Test235
Automatic Test Printout236
AMPS Cell Site Simulator Manual Tests237
Registration Test238
Mobile Init Test239
Cell Init Test242
Edacs Trunking (Option 16)245
Edacs Trunking Setup Screen246
Edacs Trunking Channel Assignments247
Edacs Trunking Automatic Test248
Edacs Trunking Automatic Test Execution249
Edacs Trunking Automatic Test Results251
Edacs Trunking Manual Test257
Edacs Trunking Manual Test-Repeater Simulator258
Edacs Trunking Manual Test-Radio Simulator263
Edacs High-Speed Data Capture (Scope)268
Edacs Store and Recall269
Edacs Trunking Operational Notes270
Mpt 1327 Trunking (Option 17)271
Setup Network Definition272
Syscode Calculation274
Channel Numbering275
Base Frequencies276
Trunking Simulator Screens277
Repeater Simulator279
Testing Radio Units280
Mpt 1327/Mpt 1343 Numbering Schemes281
Radio Simulator282
Automatic Test Mode, Test Selection283
Parametric Limits285
Test Execution287
Parametric Results288
Off-Air Monitor289
Appendix A - User I/O Connectors and Pin-Out Table292
Appendix B Abbr Eviations296
Appendix C Repacking for Shipping300
Appendix D Soft Function Keys302
Index314
Battery/Voltage/Fuse Instructions318
Power Source Requirement322
AC Fuse Replacement322
DC Fuse Replacement323
Battery Replacement323
Battery Fuse Replacement325

Table of Contents