ORBAN 8200_Section_6 电路图.pdf

Section 6 Technical Data pagecontents 6-2Specifications 6-9Circuit Description 6-9Motherboard 6-10Analog I/O Card 6-15Stereo Encoder Card 6-19DSP Cards 6-21Control Card 6-23Display Board 6-25Power Supply 6-25Input Filter Board 6-26D-Connector Board 6-27Parts List 6-28Obtaining Spare Parts 6-44Vendor Codes 6-45Schematics, Assembly Drawings 6-81Abbreviations OPTIMOD-FM 8200TECHNICAL DATA 6-1 RadioFans.CN 收音机爱 好者资料库 page Specifications It is impossible to characterize the listening quality of even the simplest limiter or compres- sor on the basis of the usual specifications, because such specifications cannot adequately describe the crucial dynamic processes that occur under program conditions. Therefore, the only way to meaningfully evaluate the sound of an audio processor is by subjective listening tests. Certain specifications are presented here to assure the engineer that they are reasonable, to help plan the installation, and to help make certain comparisons with other processing equipment. Performance Specifications for measurements from analog left/right input to stereo composite output and to analog left/right output are as follows: Frequency Response (All structures, measured below gain reduction and clipping thresholds, high-pass filter off): Follows standard 50s or 75s pre-emphasis curve 0.20dB, 5Hz-15kHz. Analog left/right output can be user-configured for flat or pre-empha- sized output. Noise: Output noise floor will depend upon how much gain the processor is set for (LIMIT DRIVE, AGC DRIVE, TWO-BAND DRIVE, and/or MULTI-BAND DRIVE), gating level, equali- zation, noise reduction, etc. It is primarily governed by the dynamic range of the A/D Converter, which has a manufacturer-specified overload-to-noise ratio of 97dB. The dynamic range of the digital signal processing is 144dB. Total System Distortion (De-Emphasized, 100% Modulation): <0.01% THD, 20Hz-1kHz rising to <.05% at 15kHz.65dB, 20Hz-15kHz; 70dB typical. Polarity (PROTECTION, TWO-BAND PURIST or BYPASS Structure): Absolute polarity maintained. Positive-going signal on input will result in positive-going signal on output. Installation Analog Audio Input Configuration: Left and right. Impedance: 600 or 10k load impedance, electronically balanced, jumper-selectable. Common Mode Rejection: 70dB at 50-60Hz. 45dB at 60Hz-15kHz. Sensitivity: 40dBu to +20dBu to produce 10dB gain reduction at 1kHz. Maximum Input Level: +27dBu. Connector: XLR-type, female, EMI-suppressed. Pin 1 Chassis Ground, Pins 2 and 3 electroni- cally balanced, floating and symmetrical. 6-2 TECHNICAL DATA OPTIMOD-FM 8200 RadioFans.CN 收音机爱 好者资料库 Analog Audio Output Configuration: Left and right. Flat or pre-emphasized. Source Impedance: 30, 5%, electronically balanced and floating. Load Impedance: 600 or greater, balanced or unbalanced. Termination not required. Maximum Output Level: +23.7dBu into 600 or greater, balanced load. Connector: XLR-type, male, EMI-suppressed. Pin 1 Chassis Ground, Pins 2 and 3 electroni- cally balanced, floating and symmetrical. Digital Input and Output (Optional) Configuration: Two-channel AES/EBU-standard. Sampling rate: 32kHz (8200D/32) or 32kHz, 44.1kHz, and 48kHz (8200D/SRC). Connector: XLR-type, female, EMI-suppressed. Pin 1 Chassis Ground, Pins 2 and 3 trans- former balanced and floating. SCA Subcarrier Input Configuration: Subcarrier input sums into composite baseband outputs. Input Impedance: 600. Sensitivity: 1.0Vp-p for 10% modulation of main carrier. Connector: BNC, floating over chassis ground. EMI-suppressed. Composite Baseband Outputs Configuration: Two (2) outputs, each with independent OUTPUT level control, output amplifier and connector. Source Impedance: 0 voltage source or 75 (jumper-selectable), single ended, floating over chassis ground. Load Impedance: 37 or greater. Termination not required. Level (0 Source Impedance, 75 or higher Load Impedance): Adjustable 0-8Vp-p with multi-turn OUTPUT LEVEL control. Connector: BNC, floating over chassis ground. EMI-suppressed. Maximum Recommended Cable Length (0 Source Impedance): 100ft/30m RG-58A/U. Maximum permitted load capacitance 0.047F. OPTIMOD-FM 8200TECHNICAL DATA 6-3 RadioFans.CN 收音机爱 好者资料库 Pilot Reference Output Configuration: Buffered square-wave reference for RDS or other subcarrier services. Source: HCMOS logic level output, 0-5V peak. Connector: On Remote Control Interface. DB-25, EMI-suppressed. Remote Computer Interface Configuration: RS-232 and RS-422 interfaces to connect to IBM PC-compatible computers, directly or via modem, for remote control and metering. Minimum Hardware: 386 computer or compatible with hard disk drive, 4MB RAM, VGA grayscale or color display, DOS 3.3 or higher, Micosoft Windows 3.1 or higher, and Hayes-compatible modem (2400 baud rate, V.42bis data compression). Optimum Hardware: Pentium or 486 computer with hard disk drive, 8MB RAM, VGA color display, DOS 5.0 or later, Micosoft Windows 3.1 or later, and Hayes-compatible modem (9600 baud rate, V.42bis data compression). Connector RS-232: DB-9, EMI-suppressed. Connector RS-422: DB-9, EMI-suppressed. Remote Control Interface Configuration: Eight (8) analog or digital inputs. User-programmable to select any eight of: user presets, factory presets, stereo, mono left, mono right, SC1 modulation reduction, SC2 modulation reduction, TX1 overshoot modulation reduction, TX2 overshoot modulation reduction, clock reset, EBS tone, exit test, input analog, input digital. Voltage: 6-24VAC or DC, momentary or continuous, optically-isolated. Current-Limited 12VDC provided to facilitate use with contact closure. Connector: DB-25, EMI-suppressed. Power Requirements: Switch-selectable on the rear panel, 90-130VAC or 180-260VAC, 50-60Hz; 55VA. Connector: IEC; detachable 3-wire power cord supplied. AC is EMI-suppressed. Ground: Circuit ground is independent of chassis ground; can be isolated or connected with a rear panel switch. Safety Standards: IEC65, UL, CSA. Dimensions Dimensions (WxHxD): 19in/48.3cm wide, 7in/17.8cm high, 15in/38.1cm deep. 4 rack units. Environmental Operating Temperature Range: 32-122F/0-50C Humidity: 0-95% RH, non-condensing. 6-4 TECHNICAL DATA OPTIMOD-FM 8200 Setup and Operation Help Features HELP Button: Available at all times. Push HELP, and a message will tell you what you are looking at on the screen, what can be done and how to do it. Press each button and the message will tell you the function of that button. System Setup (I/O CALIB) Function: Initial setup. Controls: Studio chassis yes/no (defeats AGC), Pre-emphasis 50s or 75s, meter select VU or PPM, analog input clip level, analog input reference level, analog input balance, analog outputs flat or pre-emphasized, analog output level, input meters indicate ref/clip, modulation type, pilot on/off, clock sync to AC line/crystal, reduction of modulation for SC1 ON, reduction of modulation for SC2 ON, reduction of modulation for OSHOOT TX1 ON, reduction of modulation for OSHOOT TX2 ON; if Digital I/O is present: input A or D, digital input ref level. Quick Setup Function: Guided screen-by-screen setup for all required setup adjustments. On-Screen Metering Metering can be switched to indicate gain reduction (G/R) or input/output levels (I/O). Gain reduction (G/R): Shows gain reduction of AGC, compressors, high-frequency limiters, and gate on/off, as appropriate to the programmable processing structure selected. Input/Output (I/O): Left input (dB), right input (dB), left output (dB), right output (dB), composite output (% modulation). Pilot: 7.5-10%, in 0.5% steps. Preset Programming Function: Save processing settings for recall from the front panel, by remote control, by remote computer or by Automatic Preset Switching. Number of User Presets: 32. Test Presets BYPASS preset: No processing; audio is digitized and low-pass filtered only. Adjustable gain (18 to +15dB). TONE Preset: Frequency programmable 30Hz-15kHz. Level programmable 0-121% total modulation. Modulation type (L,R, L+R, LR, MONO L, MONO R), Pilot ON/OFF. Automatic Preset Switching Function: Changes presets on a programmed event schedule. Programming: Date (specific date, time, function) or daily (specific day or days of the week, time, function). Events: Up to 99 events. OPTIMOD-FM 8200TECHNICAL DATA 6-5 Pascode Security Function: To prevent unauthorized adjustment of controls by persons without pascodes. Number of Pascodes: 10. Access: Each Pascode can be programmed to permit or deny access via front panel or computer to RECALL PRESET, RECALL TEST PRESETS, MODIFY PROCESSING, OBSERVE METERS and PRESET NAMES, PROGRAM AUTOMATION (Automatic Preset Switching), PRO- GRAM SYSTEM SETUP and PROGRAM SET PASCODE. Remote Control with Orban 8200PC Remote Control Software Metering: Same as On-Screen Metering, above. Control: All user-adjustable processing parameters, Preset functions and System Setup. Circuit Characteristics Analog-To-Digital Converter (A/D Converter subject to change as technology improves.) Device: Analog Devices AD1879. Performance: 97dB dynamic range (overload-to-noise ratio). Digital Signal Processing Device: Motorola DSP56001. Performance: 24-bit processing. 144dB internal dynamic range. Digital Input Conditioning Subsonic Filter: Switchable in/out third-order Chebychev with 30Hz cutoff and 0.5dB pass- band ripple; 0.5dB 30Hz, 10.5dB 20Hz, 31.5dB 10Hz. Time Dispersion Network: All-pass network to make speech more symmetrical to reduce processing distortion. (Normal Two-Band and Multi-Band structures only.) Digital Output Conditioning Passband Response: Typically +0, 0.26dB to 15kHz. Stopband Rejection (Referenced to 100% Modulation): To reduce spectrum in stereo com- posite baseband above 57kHz to <75dB. Digital-To-Analog Converter Device: Analog Devices AD1864. Performance: 18-bit. 4X oversampled output. Linear-phase reconstruction filters. Pilot Frequency: 19kHz. Stability: 0.005%. See “Ultrastable Pilot” on page 1-9. Injection: Adjustable, 7.5-10%. 6-6 TECHNICAL DATA OPTIMOD-FM 8200 Stereo Baseband Encoder (Test signals applied to analog inputs of stereo baseband encoder.) Noise (De-Emphasized, Referenced to 100% Modulation): <100dB, 20Hz-15kHz. Distortion (De-Emphasized, 100% Modulation): <0.006% THD, 20Hz-15kHz; 65dB, 20Hz-15kHz; 70dB typical. Crosstalk Linear (Referenced to 100% Modulation): <80dB, main channel to sub- channel or subchannel to main channel. Crosstalk Non-linear (referenced to 100% modulation): 70dB; 75dB typical. 76kHz and Sideband Suppression (Referenced to 100% Modulation): 70dB. CIT25 Composite Isolation Transformer Ground loops are a problem in some transmitter plants. A ground loop among OPTIMOD- FM and one or more exciters may occur, causing an increase in hum and noise. This is especially likely when OPTIMOD-FM is installed some distance from the exciter. The Composite Isolation Transformer provides the solution. Designed to be installed adjacent to each exciter, it provides ground isolation between the OPTIMOD-FM composite output and the exciter, and presents OPTIMOD-FM with a balanced floating load. Performance Frequency Response: +0.01, 0.03dB, 30Hz-53kHz. Group Delay: Deviation from linear phase 50dB, 50Hz-15kHz. Gain: Adjustable from full attenuation to 0dB. Installation Location Location : As close to FM exciter as practical. Interconnect Between OPTIMOD-FM and Transformer Interface at OPTIMOD-FM: Adapter cable, BNC male to 3-pin XLR-type male cable connector supplied. Cable: Two-conductor foil-shielded audio cable, Belden 8451 or equivalent. Maximum length 100ft/30m, user-supplied. 3-pin XLR-type male and female cable connectors supplied. Composite Baseband Input Connector: 3-pin XLR-type female. Pin 1 capacitively-coupled to chassis ground, Pins 2 and 3 transformer balanced, floating and symmetrical. Maximum Level: 4Vp-p. OPTIMOD-FM 8200TECHNICAL DATA 6-7 Composite Baseband Output Connector: BNC, shell insulated from chassis ground. Interconnect Between Transformer and Exciter Maximum Recommended Cable Length: 6ft/1.8m RG-58A/U cable or similar, to avoid ex- cessive RF pick-up on cable. 2ft/.6m cable supplied. Exciter Input: 1k or greater; 1000pF or less. Replace 50 or 75 termination resistor, if present, with 1k resistor, supplied. Dimensions Dimension: 7in/17.8cm wide, 3in/7.6cm high, 1.72in/4.4cm deep. Warranty One Year, Parts and Labor: Subject to the limitations set forth in Orbans Standard Warranty Agreement. Specifications subject to change without notice. 6-8 TECHNICAL DATA OPTIMOD-FM 8200 Circuit Description This section provides a detailed description of each circuit used in the 8200. It starts with an overview of the 8200 system, identifying all the circuit boards and describing their purpose. Then each board is treated in detail by first giving an overview of the circuits followed by a component-by-component description. 1.Overview The 8200 has 9 types of circuit boards: Mother, Analog I/O, Stereo Encoder, DSP (digital signal processing), Control, Display, Power Supply, Input Filter and D-Connector. The block diagram on page 6-46 illustrates the following overview of 8200 circuit boards. The Motherboard contains no active circuitry and serves only to connect all the other boards together properly. The Analog I/O Card provides the circuitry to interface the analog audio inputs and outputs to the digital processing. The Stereo Encoder Card generates the composite output signal. The DSP Cards implement the audio processing using digital signal processing. The 8200 has slots for four DSP Cards. The base unit is shipped with two DSP Cards. The Multi-Band structure requires a third board. A fourth slot is provided for future options. The Control Card administrates control of the 8200 system. The Display Board provides circuitry for the LCD display, push buttons, front panel knobs. The Power Supply Board provides power for all 8200 boards. The Input Filter Board provides the connectors and RF filtering for the left and right audio inputs and outputs, the digital audio input and output, the two composite outputs, and the SCA input. The D-Connector Board provides the connectors, RF filtering, and circuitry for the remote control inputs, RS-232 interface, and RS-422 interface. Motherboard The Motherboard is used to connect all parts of the 8200 system together. Only connectors are mounted to it. It is a four layer board with nearly all signal traces on the outer two layers. The inner layers contain ground and power connections. Under no circumstances should you try to replace any components on this board. Soldering or desoldering can permanently damage the inner layers and ruin the board. OPTIMOD-FM 8200TECHNICAL DATA 6-9 Analog I/O Card 1.Overview The Analog I/O Card provides the circuitry to interface analog audio to and from the DSP Cards. The input buffer scales the input audio level to match it to the audio processor. The analog-to-digital (A/D) converter converts the analog input audio to digital audio. The