Orban OPTIMOD 8400

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Operating Manual

OPTIMOD

8400

Digital Audio Processor

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Table of Contents9
8400 Optimod-Fm Digital Audio Processor20
User-Friendly Interface21
Absolute Control of Peak Modulation21
Flexible Configuration22
Adaptability through Multiple Audio Processing Structures22
Controllable23
Presets in Optimod-Fm24
Factory Presets24
User Presets24
Input/Output Configuration24
Digital AES/EBU Left/Right Input/Output25
Analog Left/Right Input/Output25
Stereo Analog Baseband Composite Output26
Subcarriers26
Remote Control Interface26
Computer Interface27
Location of Optimod-Fm28
Optimal Control of Peak Modulation Levels28
Best Location for OPTIMOD-FM29
Studio-Transmitter Link31
Transmission from Studio to Transmitter31
Using the Orban 8100AST (or 8100A/ST) Studio Chassis with the 840034
STL and Exciter Overshoot34
Using Lossy Data Reduction in the Studio35
About Transmission Levels and Metering35
Meters35
Studio Line-Up Levels and Headroom36
Transmission Levels37
Line-Up Facilities37
Metering of Levels37
Monitoring on Loudspeakers and Headphones38
Eas Test40
Warranty, Feedback41
User Feedback Form41
Installing the 840044
8400 Rear Panel48
Audio Input and Output Connections49
Cable49
Connectors49
Analog Audio Input49
Analog Audio Output50
Aes/Ebu Digital Input and Output50
Composite Output and Subcarrier Input51
Grounding53
Power Ground53
Circuit Ground54
8400 Front Panel54
Installation of Studio Level Controller (Optional)56
If You Are Using Orban 8200ST-Studio Chassis56
If You Are Using Orban 464A Co-Operator59
If You Are Using an Orban 4000 Transmission Limiter61
Quick Setup65
Analog and Digital I/O Setup72
Using Clock-Based Automation81
Security and Passcode Programming82
To Unlock the Front Panel84
8400 User Interface Behavior During Lockout85
Default ADMIN Passcode85
If You Have Forgotten Your "All Screens" Passcode87
Administering the 8400 through Serial Port #288
Connecting to the 8400 Via a Terminal Program on a PC89
Administrative Operations90
Diagnostic Operations93
Remote Control Interface Programming93
Networking94
Setting up an 8400 Memory Card97
Installing 8400 Pc Remote Control Software98
Installing the Necessary Windows Services98
Check Hardware Requirements99
Running the Orban Installer Application100
About 8400/Pd101
About 8400Hd103
Delay Difference between Digital-Channel and FM Outputs104
HD I/O Setup Controls104
HD Audio Controls107
8400 Front109
Introduction to Processing111
Some Audio Processing Concepts111
Distortion in Processing112
Loudness and Distortion112
OPTIMOD-FM-From Bach to Rock113
Fundamental Requirements: High-Quality Source Material and Accurate Monitoring113
About the 8400'S Signal Processing Features114
Dual-Mono Architecture114
Signal Flow114
ITU-R 412 Compliance119
Two-Band Purist Processing120
Digital Radio Processing120
Input/Output Delay121
Summary121
Customizing the 8400'S Sound121
Basic Modify122
Intermediate Modify123
Advanced Modify123
Gain Reduction Metering124
About the Processing Structures124
Factory Programming Presets125
Factory Programming Presets126
Equalizer Controls132
Stereo Enhancer Controls136
Agc Controls138
Advanced AGC Controls141
Clipper Controls143
Advanced Clipper Controls148
The Two-Band Structure149
The Protection Presets149
Setting up the Two-Band Structure for Classical Music149
Customizing the Settings151
The Two-Band Structure's Full Setup Controls151
Advanced Two-Band Controls154
The Five-Band Structure155
Putting the Five-Band Structure on the Air155
Customizing the Settings156
The Five-Band Structure's Full Setup Controls156
Advanced Multiband and Band MIX Controls162
Itu-R Multiplex Power Controller165
Test Modes167
Getting the Bass Sound You Want168
Using the 8400 Pc Remote Control Software170
Navigation Using the Keyboard174
Routine Maintenance176
Removing and Replacing Parts and Assemblies177
Field Audit of Performance182
Problems and Potential Solutions192
Headphones Don't Work192
RFI, Hum, Clicks, or Buzzes192
Unexpectedly Quiet On-Air Levels192
Poor Peak Modulation Control192
Audible Distortion On-Air193
Audible Noise on Air193
Whistle on Air, Perhaps Only in Stereo Reception194
Interference from Stereo into SCA195
Shrill, Harsh Sound196
Dull Sound196
System will Not Pass Line-Up Tones at 100% Modulation196
System will Not Pass Emergency Alert System ("EAS" USA Standard) Tones at the Legally Required Modulation Level196
System Receiving 8400'S Digital Output will Not Lock197
19 Khz Frequency Out-Of-Tolerance197
L-R (Stereo Difference Channel) will Not Null with Monophonic Input197
General Dissatisfaction with Subjective Sound Quality197
Security Passcode Lost (When Unit Is Locked Out)197
Connection Issues between the 8400 and a PC, Modem, or Network198
Troubleshooting Connections199
OS-Specific Troubleshooting Advice199
Troubleshooting IC Opamps204
Technical Support205
Factory Service205
Shipping Instructions205
Specifications208
Performance208
Installation208
Circuit Description212
Overview212
Control Circuits213
User Control Interface and LCD Display Circuits213
Input Circuits214
Output Circuits216
DSP Circuit218
Power Supply218
Abbreviations219
Parts List220
Obtaining Spare Parts221
Power Supply221
Input/Output Circuit Board222
Front Panel Subassembly224
Display Circuit Board224
Display Interface Circuit Board225
Composite Input/Output Circuit Board226
Control Circuit Board226
Drawings227

Orban OPTIMOD 8400 - Page 7

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