Orban 8182A User manual

Operating Manual
OPTIMOD-TV
Audio Processor
Model 8182A

IMPORTANT NOTE: Refer to the unit’s rear panel for your Model #.
Model#: Manual References Description:
8182A/U75 8182AOPTIMOD-TV Audio Processor, 115V 75|is
8182A/J50 8182A +MVM-021 +OPT-018 OPTIMOD-TV Audio Processor, 100V 5Ops
8182A/E75 8182A+OPT-021 OPTIMOD-TV Audio Processor, 230V 75ps
8182A/E50 8182A +OPT-021+OPT-01
8
OPTIMOD-TV Audio Processor, 230V 50ps
8182AT/U75 8182AOPTIMOD-TV Audio Processor, 115V 75ps
8182AT/J50 8182A+MVM-021 + OPT-0 18 OPTIMOD-TV Audio Processor, 100V 50ps
8182AT/E75 8182A +OPT-021 OPTIMOD-TV Audio Processor, 230V 75ps
8182AT/E50 8182A +OPT-021+OPT-018 OPTIMOD-TV Audio Processor, 230V 50ps
8182AST/J 8182A/ST +MVM-021 OPTIMOD-TV Studio Chassis, 100V
8185A/U 8185A BTSC TV Stereo Generator, 115V
8185A/E 8185A +OPT-021 BTSC TV Stereo Generator, 230V
8185A/UP 81 85A+PRO Kit BTSC TV Stereo Generator, 115V, Pro Channel Gen
8185A/EP 8185A +OPT-021 +PRO Kit BTSC TV Stereo Generator, 230V, Pro Channel Gen
8182ASAP/U 8182A/SAP BTSC SAP Generator w/ Monitor Card, 115V
8182ASAP/E 8182A/SAP +OPT-021 BTSC SAP Generator w/ Monitor Card, 230V
8182APRO 8182A/PRO BTSC PRO Generator for 8182A/SG
8185APRO 8185A/PRO BTSC PRO Generator for 8185A
*Supplied with 3and 4TX cards and less the 2, 3, 4and 5cards.
OPTIONS AVAILABLE
Model#: Manual References Description:
ACC021 ACC-021 dbx Monitor Card for earlier 8182/SAP
RET037 RET-037 81 80 Connect Upgrade to accept SG
RET025 RET-025 8180A to 8182A Factory Upgrade
RET026 RET-026 8180/ST to 8182A/ST Factory Upgrade
SC4 ACC-014 Security Cover (CLEAR, BLUE or WHITE)
for OPTIMOD TV units
SC2 ACC-012 Security Cover (CLEAR, BLUE or WHITE)
for ST units
CAUTION: TO REDUCE THE RISK OF ELECTRICAL SHOCK, DO NOT REMOVE COVER (OR BACK).
NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
WARNING iTO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS
APPLIANCE TO RAIN OR MOISTURE.
This symbol, wherever it appears,
alerts you to the presence of uninsulated
dangerous voltage inside the enclosure —voltage
that may be sufficient to constitute arisk of shock.
This symbol, wherever it appears,
alerts you to important operating and
maintenance instructions in the accompanying
literature. Read the manual.

IMPORTANT SAFETY INSTRUCTIONS
All the safety and operating instructions should be read before the appliance is operated.
Retain Instructions: The safety and operation instructions should be retained for future reference.
Heed Warnings: All warnings on the appliance and in the operating instructions should be adhered to.
Follow Instructions: All operation and user instructions should be followed.
Water and Moisture: The appliance should not be used near water (e.g., near abathtub, washbowl, kitchen sink, laundry tub, in awet
basement, or near aswimming pool, etc.).
Ventilation: The appliance should be situated so that its location or position does not interfere with its proper ventilation. For example, the
appliance should not be situated on a bed, sofa, rug, or similar surface that may block the ventilation openings; or, placed in abuilt-in
installation, such as abookcase or cabinet that may impede the flow of air through the ventilation openings.
Heat: The appliance should be situated away from heat sources such as radiators, heat registers, stoves, or other appliances (including
amplifiers) that produce heat.
Power Sources: The appliance should be connected to apower supply only of the type described in the operating instructions or as
marked on the appliance.
Grounding or Polarization: Precautions should be taken so that the grounding or polarization means of an appliance is not defeated.
Power-Cord Protection: Power-supply cords should be routed so that they are not likely to be walked on or pinched by items placed
upon or against them, paying particular attention to cords at plugs, convenience receptacles, and the point where they exit from the appliance.
Cleaning: The appliance should be cleaned only as recommended by the manufacturer.
Non-Use Periods: The power cord of the appliance should be unplugged from the outlet when left unused for along period of time.
Object and Liquid Entry: Care should be taken so that objects do not fall and liquids are not spilled into the enclosure through
openings.
Damage Requiring Service: The appliance should be serviced by qualified service personnel when:
The power supply cord or the plug has been damaged; or
Objects have fallen, or liquid has been spilled into the appliance; or
The appliance has been exposed to rain; or
The appliance does not appear to operate normally or exhibits amarked change in performance; or
The appliance has been dropped, or the enclosure damaged.
Servicing: The user should not attempt to service the appliance beyond that described in the operating instructions. All other servicing
should be referred to qualified service personnel.
The Appliance should be used only with acart or stand that is recommended by the manufacturer.
Safety Instructions (European)
Notice For U.K. Customers If Your Unit Is Equipped With APower Cord.
WARNING: THIS APPLIANCE MUST BE EARTHED.
The cores in the mains lead are coloured in accordance with the following code:
GREEN and YELLOW -Earth BLUE -Neutral BROWN -Live
As colours of the cores in the mains lead of this appliance may not correspond with the coloured markings identifying the terminals in your
plug, proceed as follows:
The core which is coloured green and yellow must be connected to the terminal in the plug marked with the letter E, or with the earth symbol,
(4.), or coloured green, or green and yellow.
The core which is coloured blue must be connected to the terminal marked Nor coloured black.
The core which is coloured brown must be connected to the terminal marked Lor coloured red.
AThe power cord is terminated in aCEE7/7 plug (Continental Europe). The green/yellow wire is connected directly to the unit’s chassis. If
you need to change the plug and if you are qualified to do so, refer to the table below.
WARNING: If the ground is defeated, certain fault conditions in the unit or in the system to which it is connected can result in full line
voltage between chassis and earth ground. Severe injury or death can then result if the chassis and earth ground are touched simultaneously.
CONDUCTOR WIRE COLOR
Normal Alt
LLIVE BROWN BLACK
nNEUTRAL BLUE WHITE
EEARTH GND GREEN-YELLOW GREEN
AC Power Cord Color Coding

Safety Instructions (German)
Gerat nur an der am Leistungsschild vermerkten Spannung und Stromart betreiben.
Sicherungen nur durch solche, gleicher Stromstarke und gleichen Abschaltverhaltens ersetzen. Sicherungen nie uberbriicken.
Jedwede Beschadigung des Netzkabels vermeiden. Netzkabel nicht knicken Oder quetschen. Beim Abziehen des Netzkabels den
Stecker und nicht das Kabel enfassen. Beschadigte Netzkabel sofortauswechseln.
Gerat und Netzkabel keinen ubertriebenen mechanischen Beaspruchungen aussetzen.
Um Beruhrung gefahrlicher elektrischer Spannungen zu vermeiden, darf das Gerat nicht geoffnet werden. Im Fall von Betriebsstorun-
gen darf das Gerat nur Von befugten Servicestellen instandgesetzt werden. Im Gerat befinden sich keine, durch den Benutzer
reparierbare Teile.
Zur Vermeidung von elektrischen Schlagen und Feuer ist das Gerat vor Nasse zu schutzen. Eindringen von Feuchtigkeit und
Flussigkeiten in das Gerat vermeiden.
Bei Betriebsstorungen bzw. nach Eindringen von Flussigkeiten oder anderen Gegenstanden, das Gerat sofort vom Netz trennen und
eine qualifizierte Servicestelle kontaktieren.
Safety Instructions (French)
On s'assurera toujours que la tension et la nature du courant utilise correspondent bien aceux indiques sur la plaque de I'appareil.
N'utiliser que des fusibles de meme intensity et du meme principe de mise hors circuit que les fusibles d’origine. Ne jamais shunter les
fusibles.
Eviter tout ce qui risque d'endommager le cable seceur. On ne devra ni le plier, ni I'aplatir. Lorsqu’on debranche I'appareil, tirer la fiche
et non le cable. Si un cable est endommage, le remplacer immediatement.
Ne jamais exposer I’appareil ou le cable a une contrainte mecanique excessive.
Pour eviter tout contact averc une tension electrique dangereuse, on n'oouvrira jamais I'appareil. En cas de dysfonctionnement,
I'appareil ne peut etre repare que dans un atelier autorise. Aucun element de cet appareil ne peut etre repare par I'utiiisateur.
Pour eviter les risques de decharge electrique et d'incendie, proteger I'appareil de Phumidite. Eviter toute penetration d'humidite ou fr
liquide dans I'appareil.
En cas de dysfonctionnement ou si un liquide ou tout autre objet apenetre dans I'appareil couper aussitot I’appareil de son alimentation
et s'adresser aun point de service apresvente autorise.
Safety Instructions (Spanish)
Hacer funcionar el aparato solo con la tension yclase de corriente senaladas en la placa indicadora de caracterlsticas.
Reemplazar los fusibles solo por otros de la misma intensidad de corriente ysistema de desconexion. No poner nunca los fusibles en
puente.
Proteger el cable de alimentacibn contra toda dase de dahos. No doblar oapretar el cable. Al desenchufar, asir el enchufe yno el
cable. Sustituir inmediatamente cables danados.
No someter el aparato yel cable de alimentacibn aesfuerzo mecanico excesivo.
Para evitar el contacto con tensiones electricas peligrosas, el aparato no debe abrirse. En caso de producirse fallos de funcionamiento,
debe ser reparado solo por talleres de servicio autorizados. En el aparato no se encuentra ninguna pieza que pudiera ser reparada por
el usuario.
Para evitar descargas electricas eincendios, el aparato debe protegerse contra la humedad, impidiendo que penetren esta oliquidos
en el mismo.
En caso de producirse fallas de funcionamiento como consecuencia de la penetracion de liquidos uotros objetos en el aparato, hay
que desconectarlo inmediatamente de la red yponerse en contacto con un taller de servicio autorizado.
Safety Instructions (Italian)
Far funzionare I’apparecchio solo con la tensions eil tipo di corrente indicati sulla targa riportante idati sulle prestazioni.
Sostituire idispositivi di protezione (valvole, fusibili ecc.) solo con dispositivi aventi lo stesso amperaggio elo stesso comportamento di
interruzione. Non cavallottare mai idispositivi di protezione.
Evitare qualsiasi danno al cavo di collegamento alia rete. Non piegare oschiacciare il cavo. Per staccare il cavo, tirare la presa emai
il cavo. Sostituire subito icavi danneggiati.
Non esporre I’apparecchio eil cavo ad esagerate sollecitazioni meccaniche.
Per evitare il contatto con le tensioni elettriche pericolose, I’apparecchio non deve venir aperto. In caso di anomalie di funzionamento
I'apparecchio deve venir riparato solo da centri di servizio autorizzati. Nell'apparecchio non si trovano parti che possano essere riparate
daJIutente
Per evitare scosse elettriche oincendi, I'apparecchio va protetto dall'umidita. Evitare che umidita oliquidi entrino nell’apparecchio.
In caso di anomalie di funzionamento rispettivamente dopo la penetrazione di liquidi ooggetti nell'apparecchio, staccare immedi-
atamente I’apparecchio dalla rete econtattare un centro di servizio quaiificato.

orlxtn
PLEASE READ THIS FIRST!
Manual
The Operating Manual contains instructions to verify the proper operation of this unit and initialization of
certain options. You will find these operations are most conveniently performed on the bench before you
install the unit in the rack.
Please review the Manual, especially the installation section, before unpacking the unit.
Trial Period Precautions
If your unit has been provided on atrial basis:
You should observe the following precautions to avoid reconditioning charges in case you later wish to return
the unit to your dealer.
1)Note the packing technique and save all packing materials. It is not wise to ship in other than the factory
carton. (Replacements cost $35.00).
2) Avoid scratching the paint or plating. Set the unit on soft, clean surfaces.
3) Do not cut the grounding pin from the line cord.
4) Use care and proper tools in removing and tightening screws to avoid burring the heads.
5) Use the nylon-washered rack screws supplied, if possible, to avoid damaging the panel. Support the unit
when tightening the screws so that the threads do not scrape the paint inside the slotted holes.
Packing
When you pack the unit for shipping:
Tighten all screws on any barrier strip(s) so the screws do not fall out from vibration. Wrap the unit in its
original plastic bag to avoid abrading the paint. Seal the inner and outer cartons with tape.
If you are returning the unit permanently (for credit), be sure to enclose:
•The Manual(s)
•The Registration/Warranty Card
•The Line Cord
•All Miscellaneous Hardware (including the Rack Screws and Keys)
•The Extender Card
•The Monitor Rolloff Filter(s) (OPTIMOD-AM only)
•The COAX Connecting Cable (OPTIMOD-FM and OPTIMOD-TV only)
Your dealer may charge you for any missing items.
If you are returning aunit for repair, do not enclose any of the above items.
Further advice on proper packing and shipping is included in the Manual (see Table of Contents).
Trouble
If you have problems with installation or operation:
1)Check everything you have done so far against the instructions in the Manual. The information contained
therein is based on our years of experience with Optimod and broadcast stations.
2) Check the other sections of the Manual (consult the Table of Contents and Index) to see if there might
be some suggestions regarding your problem.
3) After reading the section on Factory Assistance, you may call Orban Customer Service for advice during
normal California business hours. The number is (1) 510/351-1001.

THIRD EDITION (January 1990)
This manual applies to OPTIMOD-TV Model 8182Ahaving Serial Numbers of 780,000
or above. It is not directly applicable to the previous OPTIMOD-TV Model 8180A due
to significant changes made to incorporate the Loudness Controller circuitry and the
Hilbert-Transform Clipper.
This manual also incorporates minor changes and corrections to the First and Second
Editions (November 1983; February 1986) of the OPTIMOD-TV Manual.
In addition, this Manual has been revised to explain the relationship between the
8182A and the other parts of the Orban BTSC Television Stereo system, including
the 8185A Stereo Generator, the 8182A/SAP Separate Audio Program Generator, and
the 8185A/PRO (previously called "ACC-020") Professional Channel Generator (which
plugs into the 8185A mainframe). Separate manuals are provided with all of these
products.
Note in particular that integrated setup instructions for OPTIMOD-TV Model 8182A
and the Orban 8185A are provided in the manual for the Stereo Generator,not in
this manual. If you are installing the 8182A and the 8185A, the instructions provided
in Part 4of this Manual (which are more general) should be ignored, and the
instructions in Section 2of the 8185A Manual should be followed instead.
If OPTIMOD-TV is installed in the "split" (sometimes called "dual-chassis")
configuration using aModel 8182A/ST Accessory Chassis, please refer to the separate
manual supplied with that unit, which carries basic service information. Setup
instructions for the 8182A/ST are found in Part 4of this 8182A Manual, and also in
Section 2of the 8185A Manual. The 8182A Manual is frequently referenced in the
manual for the Accessory Chassis and should be at hand during installation and setup
procedures.

orbon
8182A
Manual Update
LED Meter Display Upgrade
Note: We have redesigned the 8182A meter display, upgrading the analog meters to LED bar-
graph meters. To do this upgrade, we have replaced the meter resistor card documented in the
manual. Otherwise, all information provided in the 8182A manual is valid for your 8182A unit.
This document provides aCircuit Description, Parts List, Schematic and Assembly Drawing for
the new 8182A meter display board.

A-2 Orban
Circuit Description of 8182 Bargraph
LED Bargraph GAIN REDUCTION Meters
The gain REDUCTION meters each consist of ten comparators with open collector outputs.
The ten LEDs in the bargraph are connected in series, and acurrent source forces acon-
stant current into the LED string. As the magnitude of the input voltage to the compara-
tors decreases, they progressively shunt to the —15V rail the current that would ordinarily
flow through the LEDs, turning off all LEDs closer to the -15Vrail. The comparators are
biased with equal voltage increments, producing ameter whose scale is linear. Because
the gain control voltage is linear in dB, this produces adB-linear meter scale.
A250Hz “dither” signal is injected into the reference voltage string, modulating the turn-
on threshold of each comparator and causing the LEDs to appear to smoothly fade on and
off instead of switching abruptly.
Component-Level Description:
All four meters are electrically identical. However, the LIMITING meter has a
different front-panel scale (0 to 5dB instead of +10 to -15dB) and is driven from
adifferential amplifier so it can indicate the difference between the slow compo-
nent and the peak-held TOTAL component of the master gain reduction. We will
describe Meter 1(the TOTAL meter).
Current source Q1,R7, R5, R6, CR5 applies aconstant current to the series-con-
nected diodes in LED assembly CR1. Astring of ten comparators IC1, IC2,
IC4-A, IC4-B, receives the negative-going dB-linear gain reduction voltage. A
voltage divider string biases the comparators with DC reference voltages from
-0.0746 to -0.746VDC in 0.0746V steps. In meters 1, 2, and 4each 0.0746V
step corresponds to 2.5dB additional gain reduction. In meter 2, each 0.0746V
step corresponds to 0.5dB additional gain reduction. When the gain reduction is
less than the first step (2.5dB or 0.5dB, depending on meter), the gain reduction
voltage is less than 0.0746V and the outputs of all comparators are active
negative, shunting current from the series-connected LED string. As the gain
reduction increases, the output of each comparator in turn becomes open collector
and current is permitted to flow in the LED string until it encounters acomparator
whose output is still active negative, at which point the active comparator shunts
the current away from the rest of the LEDs.
A250Hz triangle-wave “dither” signal is injected into the reference voltage string
through Rl. This AC signal modulates the turn-on threshold of each comparator,
causing the LEDs to appear to smoothly fade on and off instead of switching
abruptly.

8182ALED Meter Display Upgrade
IC6 is the 250Hz dither oscillator. IC6-B is an integrator charged from the output
of IC6-A, which acts as a comparator. Positive feedback from the output of IC6-B
through R2 causes the output of IC6-A to abruptly change state each time the
output of IC6-B reaches approximately ±0.046V. The output of IC6-A is thus a
square wave, and IC6-B integrates this square wave to form the desired triangle
wave.

REF VEN ALTERNATE
DES DESCRIPTION ORBAN P/N ill VENDOR P/N VENDORS (1) NOTES
LED METER DISPLAY BOARD
Capacitors
Cl ,2 Monolythic Ceramic, 50V, 20%; 0.1 uF 21123-410 SPR 1C25 Z5U104M050B KEM
C3 Met. Polyester, 63V, 5%; .01 uF 21442-310 WIM MKS2635.01
C4,5 Monolythic Ceramic, 50V, 20%; 0.1 uF 21123-410 SPR 1C25 Z5U1 04M050B KEM
C6 Alum., Radial, 63V, -20% +100%; 2.2uF 21209-522 SPR 502D 225G063BB1C PAN
C7 Ceramic Disc, 1kV, 10%; 0.001 uF 21112-210 CRL DD-102 MUR
Diodes
CRl LED Array, +7.5 TO -15.0 25160-002 ORB
CR2 LED Array, -0.5 TO -5 25160-004 ORB
CR3,4 LED Array, +7.5 TO -15.0 25160-002 ORB
CR6 LED, Yellow 25106-001 HP HLMP-1400 Gl
CR7 LED, Red 25106-003 HP HLMP-1300 Gl
CR8 LED, Yellow 25106-001 HP HLMP-1400 Gl
CR9 LED, Green 25106-002 HP HLMP-1503 Gl
Integrated Circuits
IC1-5 Quad Comparator 24710-302 NAT LM339
IC6 Linear, Dual Opamp 24206-202 Tl TL072CP MOT
IC7-11 Quad Comparator 24710-302 NAT LM339
IC12 Linear, Single Opamp 24013-202 Tl TL071CP
Miscellaneous
J1 Cable Assy, Flat, 14 Pin, 18.5 inches 40010-004 OR8
J2 Cable Assy, Flat, 14 Pin, 15 inches 40010-003 ORB
Transistors
Q1-4 Transistor, Signal, PNP 23002-101 MOT 2N4402 FSC
Resistors
R47.48 Trimpot, Cermet, 1Turn; 2K 20509-220 BEK 72XR2K BRN
Switches
S2 Switch, Rotary, 1P12T 26078-306 CTS 212-Series
!FOOTNOTES:
|(1) See page J-39 of the Manual for Vendor abbreviations (4) Realignment may be required if replaced,
(2) No Alternate Vendors known at publication see Circuit Description and/or Alignment
J(3) Actual part is specially selected from Instructions
part listed, consult Factory
SPECIFICATIONS AND SOURCES FOR
REPLACEMENT PARTS
Orban Model 8182A j
LED Meter Display Board -Capacitors, Diodes,
Integrated Circuits, Miscellaneous, Transistors, Resistors, i
Switches.
i
i
Orban

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orbon
TITLE SCHEMATIC, 81 82A
LED METER DISPLAY
61 141 -000-01. Sheet 2of 2
i

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NOTES:
FOR -0D2 VERSION ONLY: ADD JUMPERS (TEST POINT WIRES) BETWEEN
PADS 1&3(THE •'OUTSIDE'' PADS) INSTEAO OF THE POTS. R47 A. R4B
REFER TO TABLE FOR JUMPERS. J3 IS INSTALLED FOR THE 01 OQ S. THE 0102.
j4|S INSTALLED FOR THE 01 02/SAP ONLY. MARK VERSION NUMBER IN SPACE PROVIDED
MARK MODEL NUMBER (6100A. 0182A. OR 0102 A/SAP )ON SOLDER SIDE WHERE INDICATED.
USE TEFLON TUBING ON ALL LED LEADS.
MARK REVISION LEVEL IN SPACE PROVIDED.
»-gZZ3-+
S2
,
ul&j
SQUARE PADS INDICATE PIN 1OF CONNECTORS ,CATHODE OF DIODES.
POS. SIDE OF CAPS.. PIN 1OF ICS &PIN 1OF LED ARRAYS.
(UNLESS OTHERWISE SPECIFIED)
TP 1
GND
LED MOUNTING
TYPICAL, 5PLACES
I
KEYUAY
====#«
TOGGLE SWITCH
TP2
I
TP2
19KHZ
OSC
i/a
COMPONENT SIDE VERSION TABLE
VERS 1ON MODEL NUMBER JUMPER A
000 8100 AJ3
00 18182AJ3
002 8182A/SAP J4 A
orbcin
TITLE PCB ASSY, 8182A
LED METER DISPLAY
31660-001-02

Operating Manual
OPTIMOD-TV
Audio Processor
Model 8182A

The 81 82A OPTIMOD-TV is protected by U.S. patents 4,249,042; 4,208,548; 4,460,871 ;and U.K. patent 2,001,495.
Other patents pending.
OPTIMOD-TV and Orban are registered trademarks of AKG Acoustics, Inc.
This manual is part number 95035-000-05C
150 -FB -3/95
©Copyright 1995
orban
HAHarman International Company
1525 Alvarado Street, San Leandro, CA 94577 USA •Phone [phone] Fax [phone]

Table of Contents
INTRODUCTION AND SYSTEM DESCRIPTION
VARIOUS APPLICATIONS
INSTALLATION
INITIAL SETUP PROCEDURE
OPERATING INSTRUCTIONS
IN-SYSTEM PERFORMANCE VERIFICATION
ROUTINE MAINTENANCE
SYSTEM DESCRIPTION
CIRCUIT DESCRIPTION
USER ACCESS
FIELD AUDIT-OF-PERFORMANCE PROCEDURE
FIELD ALIGNMENT PROCEDURE
TROUBLE DIAGNOSIS AND CORRECTION
INTERFACING TO THE ORBAN 8185A
NORMAL POSITIONS OF JUMPERS ON CARDS
Appendix Ihas been intentionally omitted.
SCHEMATICS, ASSEMBLY DRAWINGS, AND PARTS LISTS
Appendix Khas been intentionally omitted.
SPECIFICATIONS

INTRODUCTION AND SYSTEM DESCRIPTION
3-5 Initial Electrical Checkout
3-5 Equipment Location
3-5 Difficult Environments
3-6 Mounting And Grounding
3-6 Input Signal Connections
3-7 Accessory Chassis Output Connections
3-7 Main Chassis Output Connections
3-7 Interfacing ABTSC Stereo Generator
3-8 Remote Gain Reduction Meter
1-1
1-2
1-3
1-3
1-3
1-3
1-4
1-4
1-5
1-6
1-6
1-7
1-7
1-7
1-8
Function Of OPTIMOD-TV
Comparison With OPTIMOD-FM Model 8100A
Comparison With OPTIMOD-TV Model 8180A
Split Configuration
Simplified System Description
Input Conditioning Filter
Dual-Band Compressor
Preemphasis and High Frequency Limiter
Loudness Controller
"Hilbert-Transform Clipper"
Frequency -Contoured Sidechain Overshoot
Corrector
Stereo Generator Interface Port And Line
Ampli fier/Deemphasis
VU Meter
BTSC Stereo And The 8182A
Summary
APPLICATIONS
2-1 Studio-Transmitter Links
2-2 Exciters
2-3 Additional Aural Sibcarriers
2-3 Stereo
INSTALLATION
3-1 Registration Card
3-1 Unpacking And Initial Inspection
3-1 Physical Examination
3-1 Power Considerations
3-2 Fig. 3-1: Power Cord Compatibility
3-2 Initialization Options
3-2 Output Preemphasis
3-3 Fig. 3-2: Output Preemphasis Jumper
3-3 Input Attenuator Pads
3-3 Fig. 3-3: Input Attenuator Jumper
3-3 Defeating The 30Hz Highpass Filters
3-3 L/R or L+R/L-R Output Mode
3-4 Fig. 3-4: Card it 7Output Format Jumper
3-4 Loudness Controller
3-4 Fig. 3-5: Card it 2Power-Up
3-4 Fig. 3-6: Deemphasis Jumpers
3-4 Other Jumpers
3-4 Reassembly
INITIAL SETUP PROCEDURE
4-1 Dual-Chassis Alignment
4-4 Single-Chassis Alignment
4-5 Program Tests
4-
6Fig. 4-5: Recommended Initial Control Settings
OPERATING INSTRUCTIONS
5-
28182AAudio Processor Controls
5-3 Fig. 5-1: 8182A Controls and Meters
5-4 Getting The Sound You Want
5-4 Recommended Settings For The Best Sound
5-5 Fig. 5-2: Recommended Control Settings
5-6 Adjusting The GATE THRESHOLD Control For Arts
Programming
5-6 Setting The LOUDNESS CONTROLLER Switch For
Music Videos
5-7 Understanding More About Audio Processing
5-7 Some Audio Processing Concepts
5-7 Gatging For Unobtrusive Processing
5-8 Control Of Dynamic Range -Gain Reduction
And Release Time
5-9 ANote About Gain Reduction Metering
5-9 Excessive Commercial Loudness
5-10 Peak Control
5-10 High-Frequency Limiting To Reduce Distortion
5-11 Spectral Balance
5-12 CATALOG Of OPERATING OBJECTIVES AND
SOLUTIONS
5-12 Fig. 5-3: Initial Control Settings
5-12 To Control Relative Loudness
5-12 To Obtain More Consistent Levels
5-12 To Obtain More Brightness
5-12 To Obtain More Bass
5-13 To Obtain Less Bass
5-13 To Make "Air" Sound Most Like "Program"
5-13 To Obtain "Open" Sound
5-13 To Obtain A"Heavily-Processed" Sound
5-13 To Avoid "Noise Pump-Up"
5-13 To Achieve More Subtle Gain Riding On Wide-
Dynamic Range Material
5-13 To Avoid Excessive Sibilance

IN-SYSTEM PERFORMANCE VERIFICATION APPENDIX C: USER ACCESS
6-1 Mono Performance Verification
6-2 Stereo Performance Verification
Bl ROUTINE MAINTENANCE
7-1 General
7-1 Routine Performance Verification
APPENDIX A: SYSTEM DESCRIPTION
A-l Comparison With OPTIMOD-TV Model 8180A
A-2 Input Amplifier
A-2 30Hz Highpass Filter
A-3 Allpass Phase Scrambler And
Preemphasis /Deemphasis
A-3 Dual-Band "Master/Bass" Compressor
A-3 Crossover And Bass Clipper
A-4 Voltage-Controlled Amplifier Operation
A-4 Compressor Control Circuitry
A-6 Phase-Corrected Lowpass Filter/Preemphasis
A-6 High Frequency Limiter
A-7 Peak Limiting System
A-8 Clipper With Dynamic Threshold
A-8 Hilbert-Transform Clipper
A-915kHz Phase-Corrected Bandpass Filter
A-9 Frequency-Contoured Sidechain Overshoot
Compensator
A-10 Balanced Line Amplfier and Deemphasis
A-10 Power Supplies
A-ll Loudness Controller
APPENDIX B: CIRCUIT DESCRIPTION
B-l Input Amplifier
B-l 30Hz Highpass Filter
B-2 Allpass Phase Scrambler And
Preemphasis/Deemphasis
B-2 Dual-Band "Master/Bass" Compressor
B-2 Crossover And Bass Clipper
B-2 Voltage-Controlled Amplifier Operation
B-3 Compressor Control Circuitry
B-5 Gain Reduction Metering
B-6 Gating Circuitry
B-6 Phase-Corrected Lowpass Filter/Preemphasis
B-7 Differential Preemphasis And High Frequency
Limiter
B-7 High Frequency Limiter Control Circuitry
B-8 Peak Limiting System
B-8 Clipper With [Dynamic Threshold
B-9 Hilbert-Transform Clipper
B-ll 15kHz Phase-Corrected Bandpass Filter
B-12 Frequency -Contoured Sidechain Overshoot
Compensator
B-12 Balanced Line Amplfier With Deemphasis
B-13 Unregulated Power Sipply
B-13 +15 Volt Regulator
B-14 -15 Volt Regulator
B-14 Miscellaneous Voltage Supplies
B-14 Loudness Controller
C-l Routine Access
C-l User Adjustments
C-l Line Fuse, Power Switch, and Line Voltage
Selector
C-l Circuit Cards
C-l Service Access
C-l General Cautions
C-2 Cover Removal
C-2 Access To Area Behind Rear Panel
C-2 Access To Input Filter Card
C-2 Access To Unregulated Power Sipply Chamber
C-3 Removal Of Card //PS (The DC Regulator) From
Rear Panel And Power Transistor Replacement
QAPPENDIX D: FIELD AUDIT-OF-PERFORMANCE
PROCEDURE
D-l General
D-l Required Equipment
D-l Audio Processing
D-2 Standard Control Setup
D-2 Skeleton Proof
D-3 Operate-Mode Measurements
D-4 Loudness Controller
FIELD ALIGNMENT PROCEDURE
E-l General
E-l Required Test Equipment And Materials
E-2 Card #PS (Power Supply)
E-2 Cards #3/#4 (Input Buffer/Input Conditioning
Filter/ Compressor Audio Path)
E-4 Card //5 (Compressor Control/Gating Detector)
E-4 Card #6 (Preemphasis/HF Limiter)
E-5 Fig. E-ls Deemphasis Network
E-5 Fig. E-2: Overall Deemphasized Response
E-6 Cards //0 And ftl
E-7 Cards #8/#9
E-7 Fig. E-3: 2.2-15kHz Bandpass Filter Response
E-8 Fig. E-4: 4.4kHz Overdriven FCS Output

FAPPENDIX J: SCHEMATICS, PARTS LOCATORS.
AND PARTS LISTS
APPENDIX F: TROUBLE DIAGNOSIS AND
CORRECTION
F-l General
F-l Problem Localization Routine
F-l General Principles
F-2 Power Supply Tests
F-2 VU Meter Techniques
F-3 Card Swap Technique
F-3 Cards Common To Both Channels
F-4 Failures Which Cannot Be Diagnosed By Card-
Swapping
F-4 Phase Corrector Failures
F-5 Emergency Bypass Of Cards #0 And it 1
F-5 Fig. F-l: Card #6 Channel Reversal Jumpers
F-6 Fig. F-2: Card #8/#9 Emergency Bypass
Jumpers
F-7 CATALOG Of TROUBLE SYMPTOMS AND
POSSIBLE CAUSES
F-9 Factory Assistance
F-10 Diagnosis At The Component Level
F-10 Troubleshooting IC Opamps
F-ll Selecting and Ordering Replacement Parts
F-ll Ordering Parts From the Factory
F-ll Replacement Of Components On Printed Circuit
Cards
F-13 Shipping Instructions
F-13 Circuit Cards
F-13 Shipping The Complete Chassis
APPENDIX G: INTERFACING TO THE ORBAN
8185A
J-l General
J-l Table Of Contents For Appendix J
J- Schematics With Parts Locator
J-2 Input Filter
J-4 Motherboard
J-5 Raw DC Section
J-6 Meter Resistor
J-8 Card //PS (Power Supply)
J-10 Card #0/1
J-12 Card #2
J-14 Card #3/4
J-16 Card #5
J-18 Card it 6
J-20 Card #7
J-22 Card #8/9
J-24 SYSTEM BLOCK DIAGRAM
J-27 PARTS LIST
J-27 Obtaining Spare Parts
J-39 Vendor Codes
APPENDIX K:
HAPPENDIX L:
(not used)
SPECIFICATIONS
G-l Interface
G-2 Fig. G-l: Wiring Diagram, Stereo Generator
Interconnection
APPENDIX H: NORMAL POSITIONS OF JUMPERS
ON CARDS
APPENDIX I: (not used)

PARTI:
Introduction
Function of OPTIMOD-TV: OPTIMOD-TV is an integrated signal-processing system
which replaces conventional compressors, limiters, and clippers. It is an adaptation
of the OPTIMOD-FM Model 8100A to TV audio, and offers the TV broadcaster the
same superb audio quality that has made the 8100A so popular among FM radio
broadcasters.
Briefly, the OPTIMOD-TV system performs the following functions:
1. It rides gain over arange of as much as 25dB, compressing dynamic range and
compensating for gain riding errors on the part of operators. The amount of
dynamic range reduction ordinarily produced is adjustable. When OPTIMOD-TV is
operated at its optimum release time setting, gain riding and compression are
virtually undetectable because of advanced program-controlled time constants,
level-dependent gating, and multiband compression.
2. It controls excessive perceived loudness by means of acomplex loudness-
estimating circuit that reduces the gain of the compressor VCA's when
necessary. The loudness controller circuit can be activated and defeated by
remote control or locally as required. This circuit is licensed from CBS
Technology Center and incorporates the results of their second major loudness
research project (1978-1980). On-air tests of the controller have indicated that
it substantially reduces or eliminates viewer complaints regarding excessively
loud commercials.
3. It controls potential interference to video and/or future stereo services by
means of bandwidth-limiting 15kHz lowpass filters incorporating full overshoot
compensation. OPTIMOD-TV thus provides extremely tight control over peak
modulation, preventing overmodulation and controlling its output spectrum
simultaneously.
4. The OPTIMOD-TV compressor is adual-band design which can be operated with
the bands independent of each other ("independent"), or such that the bands are
coupled and ordinarily track each other ("wideband"). When operated in
"independent" mode, OPTIMOD-TV makes audio quality more consistent by
correcting frequency balances between bass and midrange material. When
operated in "wideband" mode, it will preserve frequency balances and will
produce an output which sounds like its input.
5. It prevents peak overload and overmodulation due to the effects of the
preemphasis curve.
Each part of the OPTIMOD-TV system has been precisely engineered to be
compatible with all other parts to achieve optimum performance. The basic
OPTIMOD-TV is astereo unit with active balanced +10dBm outputs. Internal
jumpers determine if the output is to be flat or preemphasized.
In general, OPTIMOD-TV should be fed unprocessed audio. However, additional
compression and/or other audio processing may be desirable if applied to individual
microphone channels in alive production environment, or to other sources requiring
special processing.
OPTIMOD-TV as ordinarily sold is fully equipped for stereo operation. Little cost
would be saved by eliminating components for the second channel, and future
conversion would be somewhat inconvenient. In addition, the second channel provides
acertain measure of redundancy and permits utilization of card-swapping techniques
to diagnose problems.
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