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General| Brand | Orban |
|---|---|
| Model | OPTIMOD-FM 8100A/1 |
| Category | Computer Hardware |
| Language | English |
Information on the postpaid Registration Card packed with the manual for product registration benefits.
Instructions on saving original packing material for potential future shipments or service.
We are interested in your comments for product and manual improvements.
Details on the FCC verification for the stereo generator section of the OPTIMOD-FM.
Information on controlling access to setup controls via a lock and the supplied keys.
Overview of OPTIMOD-FM as an integrated signal-processing system replacing conventional processors.
Discussion of optional accessories like Studio Chassis, Six-Band Limiter, and Filter Card.
Description of the phase scrambler and 30Hz highpass filter for peak symmetry and subsonic filtering.
Explanation of the parallel 'Bass' and 'Master' compressors with independent or wideband modes.
Details on the phase corrector, lowpass filter, preemphasis, and HF limiter for peak control.
Description of the peak limiting function with distortion cancellation and frequency filtering.
Explanation of the FCS circuit for eliminating overshoots without adding out-of-band components.
Overview of the stereo generator's matrix approach for producing a composite baseband signal.
Description of the front-panel VU meter's monitoring capabilities for audio and stereo parameters.
Details on the Studio Accessory Chassis for performing compression ahead of the STL.
Information on the 8100A/XT for aggressive multiband processing and increased loudness.
Description of the FM Filter Card (Card #0) for enhanced SCA protection and reduced splatter.
Discussion of five types of studio/transmitter links and their use with OPTIMOD-FM.
Information on interfacing OPTIMOD-FM with various direct-FM exciters, including warnings.
Importance of wideband RF amplifiers and antennas for passing FM signal sidebands.
Notes on OPTIMOD-FM's compatibility with SCA and optional FM Filter Card for protection.
Details on selecting operating modes (STEREO, MONO LEFT, MONO RIGHT) via remote control.
Considerations for operating in humid, electrically stormy, or power-failure-prone environments.
Instructions to fill out and mail the Registration Card to the factory.
Steps for unpacking the unit and performing an initial inspection for damage.
General inspection of the unit's perimeter to check for obvious damage.
Instructions on operating voltages, fuse values, and AC connection requirements.
How to change operating characteristics using jumpers for Powerup Mode and Mono Mode.
Procedure for defeating 20dB input pads for lower input levels.
Instructions on how to defeat the 30Hz highpass filters via a jumper.
Steps for reassembling the subpanel and front panel after modifications.
Procedure to verify unit operation by checking indicator lights and meter readings.
Recommendations for locating the chassis relative to RF fields and transmitters.
Important steps for proper chassis mounting and grounding to ensure RF-tight seal.
Instructions for connecting audio inputs in high RF and low RF environments.
Details on the studio chassis output impedance and level for driving land-lines or STL.
Information on the composite output connection, impedance, and cable length recommendations.
Instructions for connecting to balanced exciter inputs, including ground considerations.
Instructions for connecting to unbalanced exciter inputs, including ground loop prevention.
Details on remote control terminals for mode selection and interfacing.
Information on the negative voltage output for the G/R terminal and connecting an external meter.
Procedure for aligning the STL and transmitter chassis for correct levels.
Steps for adjusting stereo generator controls for proper output and modulation levels.
Procedure for adjusting separation using an oscilloscope for a flat baseline.
Procedure for adjusting pilot phase using an oscilloscope for horizontal tips.
Listening tests to detect obvious audio quality problems before final adjustments.
Basic philosophy on achieving desired sonic characteristics and understanding tradeoffs.
Explanation of the purpose and function of each setup control on the unit.
Guidance on adjusting the BASS COUPLING control for 'WIDEBAND' or 'MULTIBAND' modes.
Instructions for judiciously adjusting other controls to customize the sound.
Details on optimizing RELEASE TIME and understanding gain reduction effects.
Explanation of the tradeoff between distortion and high frequency loss controlled by this knob.
How to adjust the GATE THRESHOLD to prevent noise during short pauses.
Explanation for the absence of certain controls found in triband systems.
Practical advice on adjusting controls for desired sonic characteristics like loudness and brightness.
Straightforward procedure to verify mono performance using test signals.
Outline of measurements for stereo performance verification, though not legally required.
Verification of main channel (L+R) mono requirements for frequency response, distortion, and noise.
Procedure to check mono requirements for the stereo subchannel (L-R).
Measurement of main-to-subchannel and subchannel-to-main channel crosstalk using test modes.
Verification of 38kHz subcarrier suppression levels using a stereo monitor.
Method for measuring the pilot frequency using a frequency counter.
Straightforward measurement of pilot injection levels using a stereo monitor.
Tests for crosstalk, 38kHz suppression, and pilot parameters using stereo monitor.
Testing remote control terminals and stereo generator switching logic for correct operation.
Using a spectrum analyzer to verify stereo performance specifications like spurious components.
Tests for dynamic separation, 38kHz suppression, and pilot injection without interrupting programming.
Procedure to measure dynamic separation by suppressing one stereo input channel.
Checking 38kHz suppression levels on the stereo monitor.
Routine measurement of pilot injection levels to ensure they are between 8% and 10%.
Using the ear as the primary test instrument for audio processing, with optional sinewave tests.
Description of the RFI suppression network, pad, and instrumentation amplifier.
Details on the third-order Chebychev highpass filter and its purpose.
Explanation of the phase scrambler function and preemphasis stages.
General overview of the dual-band compressor's audio path and control circuitry.
Description of the 12dB/octave crossover and bass clipper circuit.
General description of the VCA circuitry used throughout the OPTIMOD-FM system.
Details on the compressor control circuitry, including rectifier, timing, and gating functions.
Explanation of the filter's functions: lowpass filtering, preemphasis, and phase correction.
Description of the HF limiter function, variable gain stage, and control circuitry.
Details on the FM Smart Clipper circuit, including distortion cancellation and delay correction.
Description of the clipper with dynamic threshold adjustment for optimal use of circuitry.
Explanation of the 15kHz phase-corrected lowpass filter and its function.
Details on the sidechain that cancels clipping-induced distortion below 2.2kHz.
Explanation of the FCS circuit as a bandlimited safety clipper for overshoot compensation.
General principles of the stereo generator's 'matrix' approach to composite baseband signal generation.
Description of the 19kHz oscillator employing an AGC loop for linear oscillation.
Explanation of how the 19kHz oscillator output is converted to a 38kHz square wave.
Details on the 38kHz filter and phase shifter that maintain phase relationship with the 19kHz pilot.
Explanation of the AGC loop used to stabilize the 38kHz sine level for high separation.
Description of the PLL circuit for precisely controlling phase between 19kHz pilot and 38kHz subcarrier.
Explanation of the stereo modulator's function and components for generating baseband signal.
Details on the CMOS logic controlling the stereo generator's three operating modes.
Description of the highly regulated +15V and -15V power supplies and other voltage sources.
Detailed component-level description of the input amplifier circuitry.
Detailed component-level description of the 30Hz highpass filter.
Detailed component-level description of the phase scrambler and preemphasis stages.
Detailed component-level description of the dual-band compressor's audio path.
Detailed component-level description of the crossover and bass clipper circuits.
Detailed component-level description of the VCA operation.
Detailed component-level description of the compressor control circuitry.
Detailed component-level description of the gain reduction metering circuits.
Detailed component-level description of the gating circuitry.
Detailed component-level description of the phase-corrected lowpass filter and preemphasis.
Detailed component-level description of the differential preemphasis and HF limiter.
Detailed component-level description of the HF limiter control circuitry.
Detailed component-level description of the clipper with dynamic threshold.
Detailed component-level description of the 15kHz phase-corrected lowpass filter.
Detailed component-level description of the distortion-cancelling sidechain filter.
Detailed component-level description of the FCS overshoot compensator.
Detailed component-level description of the stereo generator's general principles.
Detailed component-level description of the 19kHz oscillator and its AGC loop.
Detailed component-level description of the 19kHz doubler circuit.
Detailed component-level description of the 38kHz filter and phase shifter.
Detailed component-level description of the 38kHz AGC loop.
Detailed component-level description of the 38kHz PLL circuit.
Detailed component-level description of the L-R amplifier circuit.
Detailed component-level description of the 38kHz doubly-balanced modulator.
Detailed component-level description of the output summing amplifier.
Detailed component-level description of the mode switching logic.
Detailed component-level description of the unregulated power supply circuit.
Detailed component-level description of the +15 volt regulator circuit.
Detailed component-level description of the -15 volt regulator circuit.
Brief description of miscellaneous voltage supplies.
Accessing user-adjustable controls via the small access door.
Accessing the line fuse, power switch, and voltage selector by swinging down the front panel.
Procedure for removing the subpanel and accessing the PC cards.
General cautions for best RFI protection and proper screw usage during service.
Instructions for removing the top or bottom covers, noting it's usually not necessary for service.
Procedure for accessing the area behind the rear panel without removing covers.
Procedure to access the RF filter card by opening the rear panel and removing the filter box.
Steps to access the unregulated power supply chamber.
Procedure for removing the DC Regulator card and replacing power transistors.
List of test equipment required for performance checks.
Recording normal control settings and setting them for measurements.
Performing basic proof tests for left and right channels using an audio oscillator.
Evaluating static characteristics in normal OPERATE mode, including output level and THD.
Tests for stereo performance including crosstalk, suppression, and pilot parameters.
Connecting oscillator and stereo monitor for measuring separation and pilot phase.
Testing remote control terminals and stereo generator switching logic.
Verifying stereo performance specifications using a spectrum analyzer.
List of required test equipment for field alignment.
Alignment procedure for the power supply card.
Alignment procedure for input buffer, filter, and compressor audio path cards.
Alignment procedure for the compressor control and gating detector card.
Alignment procedure for the preemphasis and HF limiter card for both channels.
Alignment procedure for the FM Smart Clipper and FCS Overshoot Compensator cards.
Optional verification of filters within the FM Smart Clipper.
Optional performance verification of the FCS Overshoot Corrector.
Alignment procedure for the stereo generator circuitry.
Procedure to null modulator distortion components.
Procedure to null low-frequency sub-to-main crosstalk.
Procedure to null 15kHz sub-to-main crosstalk.
Procedure to null the 76kHz component.
Procedure to null the 38kHz subcarrier.
Procedure to null the DC offset at the baseband output.
Procedure to adjust separation for the flattest possible baseline.
Procedure to adjust pilot phase for horizontal and level tips on the scope display.
Positively determine problem source using substitution and signal tracing.
Perform Problem Localization Routine to identify the faulty PC card.
Principles of signal tracing and comparing channels for problem localization.
Checking power supply output voltages for normal operation.
Using the VU meter for fast signal tracing when a channel goes dead.
Interchanging identical PC cards to isolate faults in stereo channels.
Identifying problems caused by phase corrector failures on specific cards.
Troubleshooting whistle issues related to power supply oscillation or IC711 issues.
Troubleshooting buzz or hum issues related to grounding, RFI, or power supply.
Diagnosing loss of modulation control related to limiter, stereo generator, or supply issues.
Troubleshooting bass imbalance related to compressor settings or converter failures.
Diagnosing insufficient high frequency response due to preemphasis or HF limiter issues.
Troubleshooting gross distortion related to power supply, clipper bias, or sidechain failures.
Diagnosing moderate distortion from source material, controls, or circuit failures.
Troubleshooting L-R null issues related to channel differences or VCA/HF limiter tracking.
Diagnosing lack of 38kHz suppression due to power supply drift or modulator issues.
Troubleshooting unstable pilot phase related to leaky components or power supply.
Diagnosing unstable separation related to power supply or intermittent components.
Troubleshooting SCA interference due to 76kHz suppression loss or FCS overshoot compensator failure.
Diagnosing sibilance distortion from source material, sidechain, or HF limiter failures.
Troubleshooting loss of stereo mode due to logic failure or external pulses.
Troubleshooting loss of mono mode due to logic failure or test switch settings.
Troubleshooting 19kHz frequency issues, potentially requiring crystal replacement.
First level of support via telephone consultation with Orban Customer Service.
Techniques for troubleshooting IC opamps, including voltage measurements and exceptions.
Guidance on selecting and ordering exact duplicate replacement parts.
Correct techniques for replacing components on PC cards to avoid damage.
Information required when ordering parts directly from the factory.
Recommendations for securely shipping circuit cards using foam and rigid cartons.
Instructions for packing the complete chassis, emphasizing protective material and carton requirements.
Table detailing component values for changing preemphasis from 75us to 50us.
Instructions for interfacing the Collins 310Z-1 exciter, including modifications.
Steps for interfacing the Continental 510R-1 exciter with a 785E-1 interface card.
Interface instructions for Gates TE-1 and TE-3 exciters using Orban or Gates kits.
Installation and interface instructions for the RCA BTE-15 exciter.
Overview of schematics and parts locators for various cards and assemblies.
Important notes regarding chassis interwiring, accessory information, and Dolby connections.
Index to the parts list, organized by assembly, commodity, and reference designator.
Description and specifications for signal diodes, including alternate vendors.
General specifications for Metal Film, Carbon Film, and Carbon Composition resistors.
Information required for ordering spare parts from the factory.
Guidelines for achieving high quality audio retrieval from phonograph records.
Considerations for cartridge alignment, tracking force, anti-skating, and turntable selection.
Preference for sum-and-difference recording for mono compatibility in stereo FM broadcast.
Use of time base correction technology to correct phase shift errors.
Avoidance of cheap tape due to potential problems like sloppy slitting and poor response.
Importance of using high-quality tape for consistent recordings resistant to wear.
Discussion on tape speed differences (15ips vs 7.5ips) and their impact on quality.
Recommendation for compandor-type noise reduction systems like Dolby B for tape operations.
Vital maintenance procedures for magnetic tape recorders to achieve high-quality sound.
Method for creating alignment tapes using discrete tones.
Procedure for obtaining a coarse adjustment of azimuth by peaking 15kHz tone level.
Adjusting reproduce equalizers for flat high frequency response.
Ideal method for fine azimuth adjustment using pink noise and a real-time analyzer.
Setting channel balance and gain accurately using test records and analyzers.
Recording alignment tape using an audio oscillator and adjusting record head azimuth.
Checking operating levels and headroom of FM audio plant components.
Achieving pleasing voice/music balance and reducing clipping risk for voice.
Discussion of FM medium limitations and quality requirements for FM electronics.
Opinions and recommendations on production practices for achieving high quality.
System frequency response specifications.
Specifications for the input highpass filter and phase scrambler.
Noise specifications for the total system.
Total system distortion specifications for THD and IM distortion.
Specifications for the Master Band compressor, including attack/release times and metering.
Specifications for the Bass Band compressor, including gain reduction and metering.
Specifications for the crossover control and program path.
Specifications for the HF limiter, including attack/release times and threshold adjustment.
Specifications for the FM Smart Clipper, including bandwidth and distortion cancellation.
Specifications for the FCS overshoot compensator, including system overshoot and sinewave ability.
Specifications for system separation.
Specifications for crosstalk, 38kHz subcarrier suppression, and pilot frequency.
Specifications for input impedance, common mode rejection, and sensitivity.
Specifications for the composite output impedance, level, and connector.
Specifications for auxiliary inputs/outputs used for testing.
Description of operating controls including VU meter selector and Stereo/Mono Mode Switch.
List of front-panel setup controls for Compressor, Stereo Generator, and General functions.
Specifications for power requirements, including voltage, frequency, and VA rating.
Physical dimensions of the unit, including width, height, depth, and rack units.
Operating temperature range and humidity specifications.
Information on the product warranty.
Jumper settings on cards #3/4 for input differential amplifier gains.
Jumper functions on Card #5 for Master Release Time, compression threshold, and attack time.
Jumper settings on Card #6 for routing outputs and orientation.
Jumper functions on Card #7 for Powerup Mode and Mono Mode selection.
Jumper settings on cards #8/9 for normal operation or accessory chassis use.
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