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Summary of Contents for DSP6000A

Page 1: ...m User Manual DSP6000A Digital Studio Transmitter Link IVla eley ISO 9001 Doc 602 11157 01 R A Released August 1997 11 1 Castiliun Drive Santa Barbara A 93 I17 3093 A Ph011c ROS R J621 Fa R05 6115 3R hllp 1 11 w mosclcysh com ...

Page 2: ...eration of this equipment in a residential area is likely to cause harmful interference in which case the user will be required to correct the interference at his own expense Any external data or audio connection to this equipment must use shielded cables DSP6000A User Manual Document 602 11157 01 R A Revision Configuration SECTION DWG REV ECO REVISED RELEASED Table of Contents 602 11157 TOC A DCO...

Page 3: ...Decoder Description 2 Installation 2 1 Unpacking 2 2 Power 2 2 1 AC Line Voltage Selection 2 2 2 DC Option Fuses 2 3 Pre Installation Checkout 2 3 1 Checkout of Encoder Decoder Only 2 3 2 Checkout of System Encoder STUDecoder 2 4 Rack Installation 2 5 STL Installation 2 5 1 Encoder 2 5 2 Decoder 2 5 3 Air Chain Processing 2 5 4 Repeater 2 6 Fractional T1 FT1 Installation 2 7 Data Communications 2 ...

Page 4: ...s 2 8 10 Retrofit Repeater Installation with STL 3 Operation 3 1 Encoder Front Panel 3 2 Encoder Back Panel 3 3 Encoder Pin Assignments 3 4 Decoder Front Panel 3 5 Decoder Back Panel 3 6 Decoder Pin Assignments 4 Customer Service Information 4 1 Introduction 4 2 Technical Consultation 4 3 Factory Service 4 4 Field Repair 5 Configuration 5 1 Introduction 5 2 Encoder Channel Configuration 5 3 Encode...

Page 5: ...n Efficiency 5 9 Data Channel Configuration 5 9 1 DATA 1 RS 232 5 9 1 DATA 2 RS 232 5 10 BER Threshold Selection 5 11 Automatic Audio Mute 5 12 Scrambler Disable 5 13 Configuration Programming Summary Tables 6 Troubleshooting and Testing 6 1 Audio Measurements 6 1 1 Signal to Noise Ratio 6 1 2 Distortion SINAD 6 2 Troubleshooting 6 2 1 Encoder STATUS Output 6 2 2 Decoder STATUS Output 6 3 Board Al...

Page 6: ... Test Equipment 6 5 Test Fixture Diagrams 7 Schematic and Assembly Drawings Appendix A 1 Path Evaluation Information A 2 Spectral Efficiency A 3 AES EBU Digital Audio Data Format A 3 1 AES EBU Standard A 3 2 DSP6000A AES EBU Output Page 6 24 6 26 6 27 A 2 A 2 A 5 A 5 A 7 DSP6000A 602 11157 TC1 R A ...

Page 7: ... 2S Data Connections 2 14 DSP6000A to MultiTech MT202TD Data Connections 2 15 Modification of Older PCL6020 6030 Audio PS for Digital STL Operation 2 16 Encoder to PCL606 Interconnection 2 17 Decoder to PCL606 Mono Receiver Interconnection 2 18 Encoder to PCL606 C Interconnection 2 19 Decoder to PCL606 Receiver Composite Interconnection 2 20 Encoder to PCLS0S Composite Interconnection 2 21 Decoder...

Page 8: ...K Alignment TP6 with AID Input TP4 Standard Efficiency 5 12 AID CLOCK Alignment TP6 with AID Input TP4 High Efficiency with Pilot 5 13 AID CLOCK Alignment TP6 with AID Input TP4 Standard Efficiency with Pilot 5 14 PROGRAM Output Operation Interface Mode 0 5 15 REPEATER Output Operation Interface Mode 1 5 16 AES EBU Output Operation Interface Mode 2 5 17 PCM Output Operation Interface Mode 3 5 18 F...

Page 9: ...l Usage with DSP6000A High Efficiency Operation 2 19 IF Filter Configuration 2 20 Mono Audio Processor Configuration 2 21 Mono Baseband Processor Configuration 2 22 Double Converter Configuration 2 23 FM Radio Specifications for DSP6000A Compatibility 5 1 Encoder Channel Configuration 5 2 Encoder Channel Components 5 3 Setting Encoder Transmission Efficiency 5 4 Encoder HDR1 Selection 5 5 Encoder ...

Page 10: ...ain Audio Section 6 7 Aux Audio Section 6 8 External Sync Section 6 9 Channel Encoder Section 6 10 Timing and Mode Control 6 11 Main Encoder Section 6 12 Aux Encoder Section 6 13 Main Aux Data Multiplexer 6 14 Asynchronous Data 6 15 Encoder Display 6 16 Power Supply Section 6 17 Main Audio Section 6 18 Aux Audio Section 6 19 AGC Section 6 20 Clock Recovery Section 6 21 Timing and Mode Control Sect...

Page 11: ...ble Title A 3 Spectral Occupancy A 4 AES EBU Standard Sync Preamble A 5 DSP6000A AES EBU Subframe Composition A 6 DSP6000A AES EBU Channel Status Bit Assignment DSP6000A 602 11157 TCt R A Table of Contents ix Page A 3 A 6 A 7 A 8 ...

Page 12: ...annel Service Unit Data Circuit Terminating Equipment Digital Studio Transmitter Link Data Terminal Equipment Digital to Analog Decibel Decibel relative to 1 mW Decibel relative to 775 Vrms Digital Signal Processing Digital Studio Transmitter Link Digital Voltmeter Electromagnetic Interference Frequency Modulation Oscillator Field Programmable Gate Array Frequency Shift Keying Fractional T1 Intern...

Page 13: ...ram Phase Locked Loop Transmission Rate Radio Frequency Repeater Subsidiary Communications Authorization Signal to Noise and Distortion Signal to Noise Ratio Studio Transmitter Link Time Division Multiplexing Total Harmonic Distortion Test Point Volts peak Volts peak to peak Volts root mean square Input Impedance Output Impedance DSP6000A 602 11157 TCt R A Table of Contents xi ...

Page 14: ...ntrols Section 3 Operation discusses the controls adjustments and 1 0 operations for the DSP6000A system that the user will encounter in normal operation and initial setup Section 4 Customer Service tells how to get technical assistance or return equipment for factory service and provides some field repair basics Section 5 Configuration presents programming information for the various configuratio...

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Page 16: ...m Features 1 3 DSP6000A System 1 3 1 DSP6000A System Specifications 1 3 2 DSP6000E Encoder Specifications 1 3 3 DSP6000D Decoder Specifications 1 4 System Description 1 4 1 DSP6000E Encoder Description 1 4 2 DSP6000D Decoder Description DSP6000A 602 11157 11 R A Page 1 2 1 3 1 4 1 4 1 5 1 6 1 7 1 7 1 11 ...

Page 17: ...tal baseband data stream that is accepted at the composite input of the STL transmitter This results in an efficient continuous phase frequency shift keying CPFSK modulation from the transmitter The DSP6000D decoder receives the recovered digital baseband from the STL receiver and translates this signal back to high quality program audio or digital stereo for output The system also has provisions ...

Page 18: ...sstalk between channels No background chatter from co channel or adjacent channel interference Built in AES EBU digital audio interface Built in data channels eliminate need for data sub carrier Extensive status monitoring Peak reading LED bargraph display for all audio channels Adjustable bit error rate threshold indication for monitoring transmission quality Use of field programmable gate arrays...

Page 19: ...dB Sub band ADPCM 32 kHz internal 30 50 kHz at AES EBU input 3 8 ms 10 4 for no subjective loss in audio quality Std Efficiency 0 7 bps Hz 50 dB down High Efficiency 1 4 bps Hz 50 dB down 5 µV 93 dBm at 10 4 BER for PCL6000 for two channel configuration standard efficiency DATA 1 RS 232 selectable baud rates from 4800 2400 1200 300 baud DATA2 RS 232 selectable baud rates from 9600 4800 2400 1200 3...

Page 20: ...matted linear 16 bit PCM data and frame sync in PCM MODE Output for program data and input output for clock in FT1 MODE 15 pin D type female provides active low indication of system fault clock fault modem fault processor fault mux fault system power fault relay contact AES EBU fault and DATA channel faults Bargraph Display dual ten LED display indicates peak program level relative to 100 full sca...

Page 21: ...es active low indication of system fault loss of data sync loss of incoming signal clock fault modem fault processor fault BER fault data error demux fault mute status mute relay contacts and mute disable input Bargraph Display dual ten LED display indicates peak program level relative to 100 full scale 0 dB O A output level for audio program channels display switchable from MAIN program to AUXILI...

Page 22: ... 232 data inputs RS 422 INTERFACE input and buffered STATUS output This board provides the appropriate signal conditioning 1 0 buffering and electromagnetic interference EMI protection between the outside world and the main processor portion of the encoder Source Encoder Main Processor Board The source encoder converts the audio information into digital binary 1 s arid O s serial format The source...

Page 23: ... and M6 select 1 0 source data from the following 1 internal program channels with internal synchronization for standard STL FT1 operation 2 internal program channels with external synchronization for FT1 operation 3 external program data for repeater operation or outboard source coding 4 AES EBU digital audio input or 5 unformatted linear PCM input RF spectral efficiency is selected between stand...

Page 24: ...ics 1 9 DC Option The DC option uses a triple output DC DC converter with a 12 24 or 48V input The linear regulators are bypassed on the 1 0 card The inputs are isolated allowing for positive or negative ground operation DSP6000A 602 11157 11 R A ...

Page 25: ...www SteamPoweredRadio Com 1 10 System Characteristics This page is intentionally blank DSP6000A 602 11157 11 R A ...

Page 26: ... J 1 fJ r I I I OUAL A 01 I PRE l 1 ICONV IN OUT PRE IN OUT PRE IN OUT RIGHT PCM LEF T PGM AUX 1 PCU AUX 2 PGM 4 i SAMPUR RATE CONIJ RT R OUAL A 0 f 1 1 1 _ CONV 1AIN PCM AUX PCM AUX DATA MOODI FAULT DUOOINARY NCOOER 1 TR Rl L AS l lC ERROR MUX EF tROR Cl OCK F AULT I I I I I I I I I I r i RS 232 TRANSCEl R EXT SYNC PlI EmCIENCY OOE 01 LCrT PCM RICHT PCU AUX 1 PCM AUX 2 PCM I DISPLAY BOARD I I I _...

Page 27: ...is board provides the appropriate signal conditioning 1 0 buffering and electromagnetic interference EMI protection between outside world and the main processor portion of the decoder Channel Decoder Main Processor Board The channel decoder converts the encoded multilevel baseband signal from the STL receiver demodulator into the binary data stream that was originally generated at the input of the...

Page 28: ...hannels is displayed in MAIN or AUX channel pairs on the dual LED bargraphs Two bicolor LED s display signal and data sync status Two red LED s give indication of system failure and BER threshold A yellow LED indicates individual data errors Power Supply 1 0 Board The power supply converts AC line source 115 VAC or 230 VAC internally wired to three regulated voltages 5 VDC 15 VDC and 15 VDC Superv...

Page 29: ...DPCM OCCOOER AUX 1 ADPCM DECODER AUX 2 10 8 8 8 5 SYNC LOSS ALARM AUX DATA SYNC LOSS ALARM SYNC LOSS ALARlA SYNC LOSS ALARM DUAL MUTE 1 1 0 A CNQ CONV 3 DUAL MUTE 0 A CNQ 1 _ _ _ CONV DATA CLOCK FTI CLK DATA RS 42J1 TRANSMITTER MAIN PROCESSOR CH BW M E MO MJ EXT OUTPUT t 400 M4 M5 DATA MOOE DO D7 EFFICIENCY t 40QE 84 85 86 MUTE STATUS MUTE DISABLE t 47 TIMING CONTROL BAUD SEL BAUD RATE GEN 5 15 15...

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Page 31: ...lection 2 7 2 Remote Control Communication 2 7 2 1 Subcarrier Communications 2 7 2 2 FSK Communications 2 7 2 3 RS 232 Communications 2 8 Retrofit STL Installation 2 8 1 PCL6010 Transmitter 2 8 2 PCL6020 6030 6060 Receiver 2 8 3 PCL606 Transmitter Mono 2 8 4 PCL606 Receiver Mono 2 8 5 PCL606 C Transmitter Composite 2 8 6 PCL606 C Receiver Composite 2 8 7 PCL505 Transmitter Composite 2 8 8 PCL505 R...

Page 32: ... and the drawings of Section 7 After the internal inspection replace the top covers or continue directly to Section 2 2 CAUTION Do not make adjustments of any kind until the nature of each adjustment is understood Do not apply AC power to the encoder or decoder until the procedure in Section 2 2 1 is completed 2 2 Power The encoder and decoder are each capable of operating at one of the two nomina...

Page 33: ...en the unit is plugged in To prevent electrical shock unplug the power cable before servicing Unit should be serviced by qualified personnel only 1 YEL 2 3 ORN 4 RED 5 6 BRN r r r r 0 4 C 5 ORN 6 BRN 115 VAC Figure 2 1 Transformer AC Wiring detail Table 2 1 Encoder and Decoder AC Fuse Values Line Voltage Encoder Fuse Decoder Fuse 115 VAC 1 2 Amp Slow 1 2 Amp Slow 230 VAC 1 4 Amp Slow 1 4 Amp Slow ...

Page 34: ...ify the correct fuse is installed in accordance with the fuse ratings listed in Table 2 2 Table 2 2 Encoder and Decoder DC Fuse Values Input Voltage Encoder Fuse 12 voe 1 Amp Slow 24 voe 1 2 Amp Slow 48 voe 1 4 Amp Slow Decoder Fuse 1 Amp Slow 1 2 Amp Slow 1 4 Amp Slow DSP6000A 602 11157 21 R A ...

Page 35: ...er Decoder Only If the DSP6000A Encoder and Decoder were purchased to retrofit an existing system that is if the STL transmitter and receiver are currently installed at separate sites or are not readily available for back to back test the encoder and decoder may be tested in back to back configuration separate from the system Figure 2 2 shows a typical bench test setup L AUDIO R DSP6000E GENERATOR...

Page 36: ...D DATA ERROR should be all off within a few seconds after power up 2 Remove the signal from DECODE DATA IN on the decoder SIGNAL SYNC and FAULT should turn red and BER and DATA ERROR should turn on Reconnect the signal to DECODE DATA IN 3 Apply audio to the encoder audio input at 1O dBu The display mode should be set to the appropriate channel MAIN or AUX for both encoder and decoder The encoder L...

Page 37: ...er terminated into a proper 50 ohm load Always attenuate the signal into the receiver to less than 3000 microvolts approximately 75 dB attenuation between transmitter and receiver Failure to observe these precautions can cause the transmitter final amplifier to be destroyed or the receiver preamplifier transistor to be damaged DSP6000E ENCODER PCL6010 TRANSMITTER PCL6020 6030 RECEIVER OSP6000D DEC...

Page 38: ...mitter and receiver are in close proximity there can be sufficient RF leakage from the cables to render impractical any computations of applied signal strength based upon power and attenuation data 4 At this point the encoder decoder portion of the system may be tested as described in the prior section that is for encoder decoder only 5 This is also a good opportunity to verify threshold performan...

Page 39: ...erconnect cable Similarly the decoder should be located with the STL receiver Due to strong electromagnetic interference EMI typical at a transmitter site RF field conduction on long interconnect cables can adversely effect the system error performance and cause audio drop outs NOTE Avoid cable interconnection length in excess of 1 meter in strong RF environments We highly recommend installation o...

Page 40: ...B below the peak audio level displayed by the meter depending on the program source material Ideally some form of peak limiting or leveling should precede the encoder audio inputs NOTE Do not allow the audio level to read into the red 0 dB on the LED bargraph as this causes severe distortion The AES EBU input accepts digital stereo audio input in place of the LEFT RIGHT discrete stereo input This ...

Page 41: ...TA 1 DATA 2 OUT AUXIUARY PROGRAM SOURCE SCA ETC AUXIUARY PROGRAM SOURCE SCA ETC RS 232 REMOTE CONTROL TERMINAL NOTE 1 MAIN AUDIO INPUT MAY BE EITHER DISCRETE LEFT RIGHT AUDIO OR AES EBU DIGITAL STEREO BUT NOT BOTH NOTE 2 SEE TEXT BNC MALE MALE RG A U Cl EOVIV PCL 6010 TRANSMIT TER COUP MUX NOTE 2 ANT I 2 SHIELD J BALANCED XLR OUTPUT f ANO Cl RS 232 1 2 SHIELD OTHER SERIAL OEVIC GND 3 U BALANCEO XL...

Page 42: ...d audio XLR outputs may be adjusted between 10 dBm to 14 dBm into 600 ohm loads The AES EBU output generates digital stereo audio simultaneously with the Left Right discrete stereo output This output is digital and requires no level adjustment Unlike the encoder AES EBU audio levels are displayed on the LED bargraph on the decoder AES EBU output is also available for the AUX 1 AUX 2 channel pair b...

Page 43: ... COMPRESSION STEREO GEN ETC OR AUX PROC OR SUBCARRIER GENERATOR NOTE 3 TO EXCITER TRANSMITTER NOTE 1 SEE TEXT NOTE 2 DISCRETE LEF T RIGHT AND AES EBU DIGITAL STEREO AUDIO ARE AVAILABLE SIMULTANEOUSLY COMPOSITE STEREO OUTPU T AVAILABLE AS OPTION NOTE 3 PROGRAM SUBCARRIER GENERA TOR IS MOSELEY SCG 8 OR EQUIVALENT NOTE 4 AUX 2 AUDIO OUTPUT DOUBLES AS AUXILIARY AES EBU DIGI TAL AUDIO OUT FOR AUX 1 AND...

Page 44: ...asses through devices that incorporate the aptX 100 data reduction source processing used in the DSP6000A is about seven to eight times before discernible artifacts appear The effect of combining audio data reduction schemes from different manufacturers are unpredictable and may reduce the number of generations for acceptable audio quality Figure 2 6 shows some examples of partitioning of air chai...

Page 45: ...www SteamPoweredRadio Com Installation 2 15 accomplished through phone lines or via the RS 232 data channel provided with the DSP6000A DSP6000A 602 11157 21 R A ...

Page 46: ...alog air chain showing placement of integrated processor stereo generator 1 10 J C tC 1 I r 0 DIGITAL DIGITAL STL µ DIGITAL STL I AES EB DIGITAL H DIGITAL r DIGITAL AUDIO AES EBU DSP 6000E DSP 6000D STEREO FM 1 AUDIO PROCESSOR PCL 6010 PCL 6020 GENERATOR EXCITER 2 tC Q c digital air chain showing preferred placement of digital audio processor I and digital stereo generator r 0 0 DIGITAL DIGITAL ST...

Page 47: ...gital repeater may not be necessary For multiple or longer repeater hops though intermediate digital regenerations produce a more reliable link Connection STL RX Decoder Encoder STL TX DSP6000A digital repeater configuration is shown in Figure 2 7 The interconnect cable between STL receiver baseband output and decoder DECODE DATA IN is provided with the decoder In a repeater configuration the cabl...

Page 48: ...N MALE BELDEN 8451 OR EQUIV Figure 2 8 Repeater Cable Detail Decoder DATA INPUT Level RECEIVE DATA A RECEIVE DATA 8 SIGNAL GROUND SEND TIMING A SEND TIMING B SIGNAL GROUND IA01094 1 o O 0 0 0 O 15 PIN MALE The decoder input and receiver output levels are calibrated at the factory No other adjustments are required Encoder DATA OUTPUT Level The encoder output level and transmitter deviation are cali...

Page 49: ...he T1 network and the data terminal equipment DTE that is the DSP6000A codec CSU s are available from many manufacturers DSP6000A Configuration The DSP6000A provides N x 64 data rates The data rate and the division of this data rate into channels is set by DIP switch S1 on the Encoder Main board and DIP switch S2 on the Decoder Main board as shown in Table 2 3 Number of Audio Channels 1 1 2 2 4 4 ...

Page 50: ...M or INV as required Site Studio Table 2 5 Setting Decoder Timing S4 D1 Description 1 Send Network Timing decoder synchronized to network Remote 1 Send Network Timing decoder synchronized to network Switch setting 0 off open 1 on clo9 ld CSU Configuration Set the Channel Service Unit CSU configuration as follows DTE Interface RS 449 422 or EIA 530 DTE Channel Multiples DTE Rate Multiples DTE Rate ...

Page 51: ...and encoder synchronized to network This configuration should satisfy most applications Several other DTE and network configurations exist and may be required for special applications The user is encouraged to become familiar with the details of T1 and their CSU Connection Figure 2 9 depicts typical interconnection of the DSP6000A and CSU for full duplex fractional T1 operation The interconnect ca...

Page 52: ...P6000A to CSU RS 449 Interconnection Cable ENCODER DTE RS 422 D8 15M INDICATES CSU DCE EIA 530 08 25M MD1 108 rrn TERMINAL TIMING A O li 24 0TRANSMIT SIGNAL ELEMENT TIMING A DTE TERMINAL TIMING 8 Or 9 i Hr 1 1 0 TRANSMIT SIGNAL ELEMENT TIMING 8 DTE SEND DATA A O I I O 2 0 TRANSMITTED DATA A SEND DATA BO lO i J 14 0 TRANSMITTED DATA 8 SEND TIMING A O I i Q l 0 TRANSMIT SIGNAL ELEMENT TIMING A OCE S...

Page 53: ...switches S5 and S6 on the decoder main board and switches S3 and S4 on the encoder main board The data rates must be set at both the encoder and decoder Be sure to select only one baud rate for each data channel Refer to Section 5 9 for more information on data channel configuration Each data channel can be set for 8 or 7 data bits and even odd or no parity Each channel is fixed at 1 start and 1 s...

Page 54: ...are at the studio site 2 7 2 1 Subcarrier Communications Normal STL subcarriers can be employed for some conbinations of data rates and efficiencies Please refer to Section 2 8 for further details 2 7 2 2 FSK Communications The second method to convey remote control information is to use FSK communications the normal TELCO MODEM for Moseley MRC and TCS series products placed on one of the AUX chan...

Page 55: ...e control systems the transmit port and the receive port must be the same This means some unconventional hardware connections may be required MRC1600 and MRC1620 To use the primary port on the MRC1600 or MRC1620 the up link must be converted to RS 232 communications This is accomplished by removing the Telco or Subcarrier Output board from the Control Terminal and the Telco or Subcarrier Input boa...

Page 56: ... 0 CTS S2 6 0 2400 baud S2 7 0 1200 baud S2 8 0 300 baud Switch setting O off open 1 on closed Set to Oon Revision 1 boards Table 2 11 Control Terminal CT MRC1600 1620 RS 232 Output Switch Setting Function S1 1 0 RXD S1 2 0 Gnd S1 3 0 DTR DCD connect S1 4 0 DTR S1 5 0 DCD S1 6 0 2400 baud S1 7 0 1200 baud S1 8 0 300 baud S2 1 1 TXD S2 2 1 Gnd S2 3 1 RTS CTS connect S2 4 0 RTS S2 5 0 CTS S2 6 0 240...

Page 57: ...00 1620 MUST HAVE RS 232 1 0 BOARD INSTALLED 2 CABLES ARE TWISTED SHIELDED PAIRS BELDEN 8451 OR EQUIVALENT Figure 2 11 Installation 2 27 9 PIN o MALE 0 DSP 6000 0 0 0 3 TXD ENCODER 0 0 DATA 1 OR 2 0 5 GND 9 PIN D MALE DCO RXD DTR GND DSP 6000 DECODER DATA 1 OR 2 M01068 DSP6000A to MRC1600 1620 Data Connections DSP6000A 602 11157 21 R A ...

Page 58: ...modified Serial 1 0 board or an unused port on a QUAD 1 0 board The corresponding Serial Interface or Quad Interface board supplies the RS 232 interface to the DSP6000A encoder or decoder Contact Moseley Associates to obtain the ACIA replacement cable B A 1 0 GNO 01 2 0 RX DATA 02 5 0 RTS Os 6 0 TX DATA 06 PIN 1 23 0 DCD 0 23 24 0 CTS 0 24 l 23 00000 8 A 00000 M01096 Figure 2 12 ACIA Replacement C...

Page 59: ...r End A is installed on the MODEM 11 board at location U8 and end B ins installed on the SERIAL 1 0 board at location U2 The cabling required to connect the MRC 1 2 2S to the DSP6000A is shown in Figure 2 13 MRC REMOTE TERMINAL DSP6000 DECODER DB 25 DB 9 F DB 9 M 8 DCD DCD 1 3 2 RXD RXD 2 2 3 3 20 4 DTR DTR 4 7 5 GND GND 5 6 6 6 4 7 7 5 8 8 MRC CONTROL TERMINAL DSP6000 ENCODER DB 25 DB 9 F DB 9 M ...

Page 60: ...ch as the MultiTech 202T The cabling required to connect the MultiTech MT202TD to the DSP6000A encoder and decoder is shown in Figure 2 14 Contact Moseley Associates for other modem interconnects CT studio end MULTlTECH MT202TD DSP6000 ENCODER D8 25 M D8 9 M CHASSIS GND E 1 S HE Le L CHASSIS GND RXD 3 3 TXD SIGNAL GND 7 5 SIGNAL GND SIGNAL GND 7 g SIGNAL GND RT transmitter end MULTITECH MT202TD D8...

Page 61: ...outlined above for MRC 1 2 2S systems Connect the Control Command Terminal Telco Input to the other modem Telco Output Connect the modem RS 232 port to the DSP6000A as outlined above for MRC 1 2 2S Be sure to set the baud rate and data format according to the remote control specifications Another alternative is to bypass the FSK portion of the remote control internal modem and convert the internal...

Page 62: ...ther STL radios Refer to Section 2 5 for details on setting program levels and program and data connections 2 8 1 PCL6010 Transmitter Connection Refer to Section 2 5 1 for connection of encoder to PCL6010 STL transmitter Audio PS board Configure the jumpers on the transmitter Audio PS board as follows Table 2 15 PCL6010 Audio PS Settings Jumper Description Position E2 PHASE SELECT A E3 MONO COMP C...

Page 63: ...1 O systems that do not have MONO COMP SEC DIG program level selection E8 E9 adjust R160 PGM for a meter reading of OdB 2 8 2 PCL6020 6030 6060 Receiver Connection Refer to Section 2 5 2 for connection of decoder to PCL6020 6030 STL receiver Audio PS board Configure the jumper positions on the receiver Audio PS board as follows DSP6000A 602 11157 21 R A Table 2 16 PCL6020 6030 Audio PS Settings Ju...

Page 64: ...ion Rate Comp MUX Lowest Telemetry Lowest Audio kbps Filter E9 Subcarrier Subcarrier kHz Frequency kHz Frequency kHz 64 80 IN 57 67 128 80 IN 110 92 205 80 IN 152 185 256 80 IN 152 185 341 115 IN 152 185 410 EITHER OUT None None 512 EITHER OUT None None For earlier model PCL6020 6030 receivers not equipped with the digital ready E9 jumper configuration 1991 and earlier the equivalent operation to ...

Page 65: ... channels When converting from MONO or SEC configurations replace FL and FL8 with composite filters except as noted in the two cases above Composite filters are normally included in the shipping package when PCL6020 receivers are delivered preconfigured for MONO or SEC operation Previously composite filters were identifiable by a red band but this may no longer be the case For assistance in identi...

Page 66: ...out procedure given in Section 2 3 2 and with the system operating near threshold that is at the onset of data errors adjust COMP HF TILT R7 to minimize the data error rate Meter Calibration With the meter in the PGM LVL position and the encode information transmitting through the STL system adjust PGM LVL R171 on the Audio PS board to read O dB on the meter top scale Squelch Level One of the bene...

Page 67: ...lent with a BNC male connector on one and a pigtail on the other end PROGRAM IN OSP 6000E ENCODER PCL 606 TRANSMITTER ENCODE DATA OUT MONO IN G BNC MALE MALE RG 58 A U OR EQUIV Figure 2 16 Encoder to PCL606 Interconnection ANT 1 D1097 2 Mono Audio Processor Configuration TO ANTENNA Configure the switches on the transmitter Mono Audio Processor module as shown in Table 2 20 DSP6000A 602 11157 21 R ...

Page 68: ...djustment An alternative is available to avoid recalibration of carrier deviation and speed installation Instead recalibrate the encoder OUTPUT DATA level It will be necessary to recalculate encoder output level as described in step 4 Encoder Output Level of the alignment procedure given in Section 5 3 Encoder Alignment In this case however do not adjust transmitter deviation This has the advantag...

Page 69: ...Decoder to PCL606 Mono Receiver Interconnection Mono Baseband Processor Configure the switch settings on the Mono Baseband Processor board as shown in Table 2 21 Table 2 21 Mono Baseband Processor Configuration Switch Description Position S1 DE EMPH OUT S2 15 kHz LPF OUT Within the mono baseband processor it is necessary to bypass the adjacent channel filter mux high pass filter and the mux low pa...

Page 70: ...et of data errors adjust HF TILT R11 to minimize the data error rate Output Level The receiver output is found at the MUX OUT 1 BNC connector The analog mux facility is not available in the digital STL configuration Adjust MUX LEVEL R64 to set MUX OUT 1 level approximately equivalent to the transmitter COMP input level The decoder will operate over an input range of 1 VP P to 10 V p r 20 dB or mor...

Page 71: ...CODE DATA OUT BNC MALE MALE RG 58 A U OR EQUIV ANT 1 101098 Figure 2 18 Encoder to PCL606 C Interconnection TO ANTENNA The encoder level into the transmitter determines carrier deviation For standard composite operation the transmitter deviation is calibrated to 50 kHz for COMPOSITE input level of 3 5 V P P Leave transmitter deviation fixed at this calibration This will allow quick reconversion to...

Page 72: ...e Baseband Processor Remove the lid from the Composite Baseband Processor module Remove IC U9 Remove R27 Install a jumper wire from R69 U9 pin 6 to TP L test point L Set E1 to WB HF Tilt Re install lid to module Double Converter The ceramic IF filters in the receiver must be configured depending on transmission data rate These filters are FL1 WB FL2 NB and FL3 Select the IF filter configuration ac...

Page 73: ...n With the meter in the PGM LVL position and the encoder data transmitting through the STL system adjust PGM LVL R1 to read OdB on the meter top scale Squelch Level One of the benefits of digital transmission is operation to a much lower RF threshold It is important to lower the squelch level of the receiver to take advantage of this feature The receiver squelch should be set just below that of th...

Page 74: ...tion to 50 kHz for input level of 3 5 Vp p Refer to PCL505 service manual for deviation adjustment An alternative is available to avoid recalibration of carrier deviation and speed installation Instead recalibrate the encoder OUTPUT DATA level It will be necessary to recalculate encoder output level as described in step 4 Encoder Output Level of the alignment procedure given in Section 5 3 Encoder...

Page 75: ...feedthru ca on the RF shield Output Level The receiver output is found at the AUDIO OUT BNC connector The receiver AUDIO OUT level should be roughly equivalent to the transmitter COMP input level If not adjust R901 OUTPUT ADJUST on the muting and metering board until these levels are equivalent The decoder will operate over an input range of 1 VP Pto 1O VPi 20 dB as long as the decoder is used in ...

Page 76: ...ms Deviation 64 512 kHz depending on system configuration Frequency Stability depends on application Spurious and Harmonic depends on application Emission Refer to the retrofit installation procedures described earlier in this section as a basic outline for adjustment or modification In the transmitter the greatest influence on the specifications given here usually results from the baseband filter...

Page 77: ...tisfy these requirements with little or no modification Mono type STL radios may require that the baseband filtering be bypassed Also balanced 600 ohm audio inputs found on mono systems may not be capable of handling the wider bandwidth requirements of the digital signal 2 8 10 Retrofit Repeater Installation with STL If existing STL radios are to be used for the repeater installation follow the al...

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Page 80: ... 3 Operation Section Contents 3 1 Encoder Front Panel 3 2 Encoder Back Panel 3 3 Encoder Pin Assignments 3 4 Decoder Front Panel 3 5 Decoder Back Panel 3 6 Decoder Pin Assignments OSP6000A 602 11157 31 R A Page 3 2 3 3 3 4 3 6 3 7 3 8 ...

Page 81: ... DISPLAY lual 10 LED bargraphs display audio peak program level in 3 dB steps relative to 100 full scale 0 dB AID converter input level for main and auxiliary audio inputs RED bargraph LED 0 dB indicates maximum input range of AID has been reached Do not allow audio levels beyond this point Peak audio signals above this level will be clipped by the AID converter producing distortion 3 FAULT STATUS...

Page 82: ...DJUST active balanced input XLR type Z in 10 kohm standard Multiturn adjustment of AUX 2 input level from 10 dBu to 18 dBu 5 ACC BNC female for optional accessory interface or subcarrier output Zout 100 ohms 6 ENCODE OUT BNC output of encoded modem signal Zaut 100 ohms Signal level set according to configuration 7 INTERFACE 15 pin O type RS 422 Accepts data and clock for REPEATER or PCM input Outp...

Page 83: ...ssignments for pin descriptions 3 3 Encoder Pin Assigr ments 8 1 o O O O O O O 0 0000000 15 9 Figure 3 3 STATUS Output TTL DB 15 F Function 1 n c 2 System Fault 3 MAIN Encoder DSP Fault 4 AUXiliary Encoder DSP Fault 5 DATA 2 Async Error 6 DATA 1 Async Error 7 Multiplexer Fault 8 Fault Relay ARM 9 AES EBU Fault 1o Modem Fault 11 System Clock Fault 12 5 VDC 13 Fault Relay N C 14 Fault Relay N O 15 L...

Page 84: ...Ground 6 DSR Data Send Ready Output 7 RTS Request To Send Input 8 CTS Clear To Send Output 9 Shell Chassis ground DSP6000A 602 11157 31 R A M01084 Operation 3 5 1 2 Figure 3 6 BNC Sockets Female Function 1 Shield Ground 2 Line 5 1 0 0 0 0 0 0 0 0 0 9 6 Figure 3 8 DATA2 Input RS 232 DB 9 F Function 1 2 3 TXD Transmit Data Input 4 5 GND Signal Ground 6 DSR Data Send Ready Output 7 RTS Request To Sen...

Page 85: ...eps relative to 100 full scale 0 dB D A converter output level for main and auxiliary channels This level is monitored prior to the output driver stages so adjustment of output level will not effect this indication 3 DATA ERROR yellow LED display of received data bit error 4 BER FLAG red LED display indicates received bit error rate BER is in excess of threshold Indicates marginal transmission qua...

Page 86: ...hm standard Multiturn adjustment of AUX2 output level from 10 dBm to 14 dBm into 600 ohms 5 ACC BNC female for optional accessory interface stereo generator output or subcarrier input Zout 100 ohms 6 DECODE IN BNC input of encode data signal Z 0 10 kohms Input signal level determined according to configuration Decoder allows 10 dB level variation about nominal input level 7 INTERFACE 15 pin O type...

Page 87: ...ments for pin descriptions 3 6 Decoder Pin Assignments 8 1 00000000 0000000 15 9 Figure 3 11 STATUS Output TTL DB 15 F Function 1 MAIN Decoder DSP Fault 2 System Clock Fault 3 Loss of Modem SIGNAL In 4 Mute Status 5 Loss of Data SYNC 6 Mute Relay N O 7 Mute Relay N C 8 Mute Disable Input 9 Data Error 10 BER Flag 11 AUXiliary Decoder DSP Fault 12 5 voe 13 Demultiplexer Fault 14 System Fault 15 Mute...

Page 88: ...t 2 RXD Receive Data Output 3 4 DTR Data Terminal Ready Input 5 GND Signal Ground 6 7 8 9 Shell Chassis ground DSP6000A 602 11157 31 R A MD1086 Operation 3 9 2 Figure 3 14 BNC Sockets Female Function 1 Shield Ground 2 Line 5 1 0 0 0 0 0 0 0 0 0 9 6 Figure 3 16 DATA2 Output RS 232 DB 9 F Function 1 DCD Data Carrier Detect Output 2 RXD Receive Data Output 3 4 DTR Data Terminal Ready Input 5 GND Sign...

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Page 91: ...www SteamPoweredRadio Com Section 4 Customer Service Section Contents 4 1 Introduction 4 2 Technical Consultation 4 3 Factory Service 4 4 Field Repair DSP6000A 602 11157 41 R A Page 4 2 4 2 4 3 4 4 ...

Page 92: ...example is the problem intermittent or constant What are the front panel indications If applicable what is your operating frequency Technical consultation is available at 805 968 9621 from 8 00 a m to 5 00 p m Pacific time Monday through Friday During these hours a technical service representative who knows your product should be available If the representative for your product is busy your call w...

Page 93: ...hassis will indicate where shipping screws should be installed and secured Ship equipment in its original packing if possible If you are shipping a subassembly please pack it generously to survive shipping Make sure the carton is packed fully and evenly without voids to prevent shifting Seal it with appropriate shipping tape or nylon reinforced tape Mark the outside of the carton Electronic Equipm...

Page 94: ...imes allow the problem to be traced to a component Spare Parts Kits Spare parts kits are available for all Moseley Associates products We encourage the purchase of the appropriate kits to allow self sufficiency with regard to parts Information about spares kits for your product may be obtained from our sales department or technical service department Module Exchange When it is impossible or imprac...

Page 95: ...nt leads and the printed circuit pads Solder wicking braid or a vacuum de solderer are useful for this Gently loosen the component leads and extract the component from the board Form the leads of the replacement component to fit easily into the circuit board pattern Solder each lead of the component to the bottom side of the board using a good brand of rosin core solder We recommend not using wate...

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Page 98: ...gh Efficiency with Pilot 5 6 3 Decoder Alignment Standard Efficiency with Pilot 5 6 4 Decoder Alignment FT1 5 7 Decoder Interface Configuration 5 7 1 Interface Mode O PROGRAM 5 7 2 Interface Mode 1 REPEATER 5 7 3 Interface Mode 2 AES EBU 5 7 4 Interface Mode 3 PCM 5 7 5 STL Interface Mode 5 7 6 FT1 Interface Mode 5 8 Changing Transmission Efficiency 5 9 Data Channel Configuration 5 9 1 DATA 1 RS 2...

Page 99: ...of switches Figure 5 1 illustrates settings for the two most common types of DIP switches 1 2 3 4 rn OPEN 0 1 1 0 0 1 1 0 OFF ON ON OFF OPEN CLOSED CLOSED OPEN MD1073 Figure 5 1 DIP Switch Setting Definitions Transmission Efficiency Modes Available efficiency modes are standard and high Standard efficiency mode may be further configured with pilot aided recovery similar to the high efficiency mode...

Page 100: ...er decoder pair at the ends of the paths Contact Moseley Associates for the appropriate conversion kits Channel Configuration Procedure 1 Remove top cover from encoder 2 Set S1 DIP switches for the desired channel mode according to Table 5 1 The configuration must match that of the decoder Table 5 1 Encoder Channel Configuration Channel Switch Setting No of Audio Bandwidth Data Rate Audio Mode S1 ...

Page 101: ...l mode Channel components are included in conversion kits obtained from Moseley Associates Table 5 2 Encoder Channel Components Encoder Channel Configuration Number of Audio Channels O 1 2 3 4 all 64 128 205 410 512 Data Rate kbps 128 256 341 Reference Component 410 U2 7046 U4 5326 U5 APTx U6 APTx U8 1020 U9 7C403 U10 7C403 U11 1444 U14 5338 U15 APTx U16 APTx U31 8412 Y2 40 MHz Y3 40 MHz repeater ...

Page 102: ...the desired transmission efficiency mode of operation and make the appropriate settings shown in table 5 3 2b For FT1 applications set the mode to standard efficiency as shown in Table 5 3 and proceed now to section 5 4 Component Jumper EB Jumper E9 Switch S2 D1 DSP6000A 602 11157 51 R A Table 5 3 Setting Encoder Transmission Efficiency Settings for Efficiency Modes Function Standard High Standard...

Page 103: ...4 410 332 9106881 536 9106949 5 341 402 9106964 665 9107061 2 8 256 536 9106949 806 9108549 7 9 205 665 9107061 1 07K 9107079 3 10 128 1 07K 9107079 1 62K 9108556 11 64 2 15K 9107053 3 32K 9108564 Encoder Output Level 4a Apply power to the encoder and observe ENCODE DATA OUT rear panel BNC connnector on the oscilloscope Adjust R138 OUTPUT LEVEL ADJ to obtain the level shown in Table 5 5 for the ap...

Page 104: ...itter Encode Data Transmitter Mode kbps Output Level Deviation Output Level Deviation Vp p h 0 5 kHz Vp p h 0 5 kHz 0 512 9 04 5 08 128 72 4 52 64 1 4 410 7 23 5 51 102 78 3 62 51 5 341 6 02 85 3 01 43 2 8 256 4 52 64 2 26 32 7 9 205 3 62 51 1 81 26 3 10 128 2 26 32 1 13 16 11 64 1 13 16 0 565 8 for FCC part74 non FM mask compliance Figure 5 2 Encoder Output Waveform Eye Pattern DSP6000A 602 11157...

Page 105: ...preferable to recalibrate the encoder output level for other transmitters Table 5 6 below gives encoder output level conversions for other Moseley transmitters R transmission rate in kbps and mod gain is modulation gain in Volts kHz Table 5 6 Encoder Output Level Conversion for other Transmitters Standard Efficiency High Efficiency with or without Pilot STL System Encode Output Level Vp p Encode O...

Page 106: ...pts direct data and clock input in place of discrete program inputs For FT1 operation the encoder outputs program data and accepts or outputs clock synchronization Switch Mode Setting S1 M6 M5 0 0 0 1 0 0 2 0 1 3 0 1 4 1 0 5 1 1 DSP6000A 602 11157 51 R A M4 0 1 0 1 0 0 Table 5 7 Encoder Interface Modes Function Input Output PROGRAM FT1 SND Left Right Aux 1 FT1 data elk Aux 2 audio REPEATER RPTR da...

Page 107: ...rogram data at the INTERFACE port in this mode Network synchronization is provided by the encoder FT1 data and clock outputs are provided at the INTERFACE port Figure 5 3 shows Mode Ooperation ANALOG AUDIO IN LEFT RIGHT AUX 1 AUX 2 ENCODER I I I I I I I I A D A D 1 i SOURCE ENCODER PROC CHANNEL CODER I I I ENCODE DATA OUT FT1 SEND DATA OUT INT CLK ___ _ _ _ _ _ _ _______ TERMINAL TIMING TIMING OUT...

Page 108: ...ces External synchronous clock with stability of 125 ppm must accompany the data This clock is generated by the decoder for repeater operation Repeater data transmission rate depends on the channel mode selected in accordance with Table 5 1 Repeater data rate and efficiency settings must match the corresponding settings of the encoder decoder pair at the ends of the path When the encoder is used a...

Page 109: ... the data to the internal system clock as well as converting the sample rate by adding or subtracting samples according to its internal algorithm to 32 kHz The data stream is then sent to the source encoder processor Network synchronization is established by the encoder FT1 data and clock outputs are provided at the INTERFACE port AUX channels continue to operate exclusively through the AUX 1 and ...

Page 110: ...ineate right channel from left channel The frame clock is 1 32 the data clock for stereo data so the higher frequency master clock is synthesized from this clock LEFT and RIGHT inputs are disabled in this mode AUX channels continue to operate through AUX 1 and AUX 2 discrete audio inputs This operation mode is shown in Figure 5 6 ENCODER 7 AUDIO AUX 2 A D SOURCE I ANALOG AUX 1 IN I ENCODER CHANNEL...

Page 111: ...ronization is received at the INTERFACE port Clock stability is restricted to 125 ppm Program data output is always available at the INTERFACE port for FT1 operation This mode of operation is shown in figure 5 7 ANALOGl AUDIO IN ENCODER r 7 I I I I LEFT I RIGHT I I AUX 1 AUX 2 A D SOURCE I CHANNEL ENCODER CODER A D PROC ENCODE DATA OUT FT1 SEND TIMING ___ __ EXT CLK IN TIMING FT1 SEND DATA OUT L R...

Page 112: ...t the INTERFACE port External clock stability is restricted to 125 ppm Program data output is always available at the INTERFACE port for FT1 operation AUX channels continue to operate through AUX 1 and AUX 2 discrete audio inputs This mode of operation is shown in Figure 5 8 ANALOG AUX I AUDIO AUX 2 IN DIGITAL AUDIO AES EBU IN F Tl ENCODER I I I I I I I I A D AES EBU RCVR SRC SOURCE ENCODER PROC C...

Page 113: ... the encoder decoder pair at the ends of the paths Contact Moseley Associates for the appropriate conversion kits Procedure 1 Remove top cover from decoder 2 Set S2 DIP switches for the desired channel mode according to Table 5 8 Channel Mode 0 1 2 3 4 5 6 res 7 8 9 10 11 12 res 13 res 14 res 15 res The configuration must match that of the encoder Table 5 8 Decoder Channel Configuration Switch Set...

Page 114: ... desired at the repeater site see Section 5 7 2 Channel components are included in conversion kits obtained from Moseley Associates Table 5 9 Decoder Channel Components Decoder Channel Configuration Number of Audio Channels O 1 2 3 4 all 64 128 205 410 512 Data Rate kbps 128 256 341 Reference Component 410 U23 APTx U24 APTx U25 8402 U26 4328 U30 1445 U31 1020 U32 7C403 I U33 7C403 U35 APTx U36 APT...

Page 115: ...move it now Efficiency Mode 2a For STL operation determine the transmission efficiency mode of operation and make the settings listed in Table 5 10 as appropriate The efficiency mode should match that of the encoder 2b For FT1 applications configure as shown in Table 5 10 Component Jumper E5 Jumper E Jumper E8 DIP SwS3 B4 DIP Sw S3 B5 DIP Sw S3 B6 Table 5 10 Setting Decoder Transmission Efficiency...

Page 116: ...12 410 341 256 205 128 64 Channel Mode 0 1 4 5 2 8 7 9 3 10 11 Table 5 11 Decoder HDR1 Selection HDR1 Selection for Modes Standard Efficiency with or without Pilot ohms MAI P N 169 9107087 205 9106972 267 9106956 332 9106881 402 9106964 665 9107061 1 33K 9107046 Not Installed for FT1 Table 5 12 Decoder HDR2 Selection Data Rate µFIL kbps 512 0013 ORN 410 0018 ORN 341 0024 ORN 256 0033 YEL 205 0043 ...

Page 117: ... but it does not need to be connected to the T1 network at this time Apply power to encoder decoder and CSU Data from the encoder is not required From this point the decoder alignment procedure depends on the efficiency mode setting or FT1 operation Locate the appropriate section for the mode you are using and continue the alignment procedure there i L Standard efficiency Section 5 6 1 High effici...

Page 118: ... Vp p 0 512 9 04 5 08 1 4 410 7 23 5 51 5 341 6 02 2 8 256 4 52 7 9 205 3 62 3 10 128 2 26 11 64 1 13 for FCC part 74 non FM mask compliance SetAGC 6 Set S1 AGC MODE to AGC Connect scope probe to TP4 AID IN Adjust R42 AGC LEVEL ADJ for level at TP4 AID IN 1 6 Vp p Set clock recovery 7a Connect CH1 scope probe to TP10 RCLK SIG IN Connect CH2 scope probe to TP11 RCLK SYM Adjust L1 on HDR2 RCLK LVL A...

Page 119: ...h CH2 waveform The SYNC status indicator on the front panel should now be green Fine adjust C78 for TP18 RCLK AFC1 LVL 2 s voe O s voe 4 Adjust R63 SAMPLE CLOCK PHASE ADJ until the falling edge of the clock waveform on CH2 aligns with the center of the eye of the CH1 waveform as shown in Figure 5 11 If this adjustment runs out of range switch the position of E6 DSP CLK PHASE Figure 5 10 Clock Reco...

Page 120: ...efficiency Replace the cover or continue with Section 5 7 Decoder Interface Configuration 5 6 2 Decoder Alignment High Efficiency with Pilot Continued from section 5 6 Decoder input level 5 Connect oscilloscope probe to TP1 FILTERED INPUT Verify that the input level agrees with Table 5 14 below If this level does not approximately agree with the table check the following for proper calibration 1 e...

Page 121: ...orm will have 50 duty cycle Reconnect input signal to DECODE DATA INPUT Set clock recovery 8 Connect CH1 scope probe to TP4 ND IN Connect CH2 scope probe to TP6 ND CLK Trigger scope on CH2 Adjust C78 RCLK AFC ADJ slowly until CH1 waveform synchronizes with CH2 waveform The SYNC status indicator on the front panel should now be GREEN Fine adjust C78 for TP18 RCLK AFC LVL 2 5 voe 0 5 voe Verify fall...

Page 122: ...ontinue with Section 5 7 Decoder Interface Configuration 5 6 3 Decoder Alignment Standard Efficiency with Pilot Continued from section 5 6 Decoder input level 5 Connect scope probe to TP1 FILTERED INPUT Verify that the input level agrees with Table 5 13 see Section 5 6 1 If this level does not approximately agree with the table check the following for proper calibration 1 encoder output level 2 tr...

Page 123: ... 13 MD1252 A Figure 5 13 AID CLOCK Alignment TP6 with AID Input TP4 Standard Efficiency with Pilot Set threshold performance 9 Increase attenuation between STL transmitter and STL receiver until data errors are indicated on decoder front panel 10 Slowly adjust R42 AGC LEVEL ADJ to minimize data error indications It may be necessary to increase attenuation to observe errors as optimal adjustment is...

Page 124: ...coder alignment for FT1 Replace the cover or continue with Section 5 7 Decoder Interface Configuration 5 7 Decoder Interface Configuration The decoder INTERFACE port is configured by setting DIP switches on the main processor board as shown in Table 5 15 These switches also configure the basic input output operations of the decoder The decoder provides direct data output concurrently with discrete...

Page 125: ...is mode The AUX 2 discrete audio channel may be converted into another AES EBU channel The AUX 2 XLR connector is configured for digital stereo audio by setting jumpers E13 E14 and E15 on the decoder 1 0 PS board to the AES EBU position The AUX channel AES EBU output provides a sample rate of 32 kHz and word length of 16 bits AES EBU format information is given in the appendix Figure 5 14 shows Mo...

Page 126: ...r channel components in accordance with Table 5 9 an audio drop or monitor becomes available at the repeater location Repeater data transmission rate depends on the channel mode selected in accordance with Table 5 8 Repeater data rate and efficiency settings must match the corresponding settings of the encoder decoder pair at the ends of the path Mode 1 operation and timing relation between INTERF...

Page 127: ...annel may be converted into another AES EBU channel The AUX 2 XLR connector is configured for digital stereo audio by setting jumpers E13 E14 and E15 on the decoder 1 0 PS board to the AES EBU position The AUX channel AES EBU output provides a sample rate of 32 kHz and word length of 16 bits AES EBU format information is given in the appendix Figure 5 16 shows Mode 2 for STL operation D ECODE DATA...

Page 128: ...el digital stereo audio in AES EBU format Changing the output operation requires setting jumpers E13 E14 and E15 on the decoder 1 0 PS board to either ANALOG position for discrete audio output or AES EBU position for AUX channel AES EBU output Figure 5 17 shows Mode 3 for STL operation DECODER r 7 I I I I I DECODE ___ _ DATA I IN I I CHANNEL DECODER SOURCE DECODER PROC D A D A AUX 1 I AUX 2 LEFT R...

Page 129: ...tion the decoder should be set to FT1 interface mode This is set by DIP switch S4 D1 In FT1 mode the decoder accepts external clock synchronization at the INTERFACE port External clock stability is restricted to 125 ppm Typically this synchronization is generated by the CSU All discrete and digital audio outputs are available in this mode Interface Modes Oand 2 will operate in FT1 mode Figure 5 18...

Page 130: ...d jumper settings in Table 5 3 encoder and Table 5 10 decoder Connect an oscilloscope to ENCODE DATA OUT on the encoder rear panel Verify the output provides the appropriate waveform and level see section 5 3 Set up the test configuration shown in Figure 5 9 and follow the threshold performance procedure given in Sections 5 6 1 5 6 2 or 5 6 3 depending on the transmission efficiency 5 9 Data Chann...

Page 131: ...4 1 0 1 3 1 1 0 4 1 1 1 3 0 0 0 4 0 0 1 3 0 1 0 2 0 1 1 1 Table 5 17 Data Channel Configuration Function 0 Off Open DATA 1 Mode Enable DATA 1 8 7 8 bits DATA 1 NP No Parity DATA 1 EP Even Parity DATA 2 8 7 8 bits DATA2 NP No Parity DATA 2 EP Even Parity Maximum Data Rates DATA1 4800 4800 4800 4800 4800 4800 4800 4800 2400 2400 2400 2400 baud DATA2 n a 9600 n a n a 9600 9600 9600 4800 n a 4800 n a ...

Page 132: ... Data 2 Test 9600 2 Data 2 Test 4800 3 Data 2 Test 2400 4 Data 2 Operate Note Test modes are valid for 8 bits no parity 5 9 1 DATA 1 RS 232 The encoder and decoder must be set identically Data Channer 1 DATA 1 is an asynchronous RS 232 port The data on this channel is multiplexed with the MAIN audio data within the APTx processor by replacing the LSB of the left audio data The re is no sacrifice o...

Page 133: ...odd or no parity Format is selected via switches on the main processor board as shown in Table 5 20 Each channel is fixed at 1 start and 1 stop bit Factory default is 8 bits no parity Switch Settings Encoder S2 Decoder S4 02 03 04 0 0 0 0 0 1 0 1 0 0 1 1 1 0 0 1 0 1 1 1 0 1 1 1 Table 5 20 Data 1 Format Selection Data Bits Parity 8 None 8 None 8 Even 8 Odd 7 None 7 None 7 Even 7 Odd Total Bits 10 1...

Page 134: ...encoder main processor board as shown in Table 5 21 Be sure to select only one baud rate Table 5 21 Data Channel 2 Baud Selection Switch Settings Encoder 54 Baud Rate Decoder56 1 2 3 4 5 1 0 0 0 0 9600 0 1 0 0 0 4800 0 0 1 0 0 2400 0 0 0 1 0 1200 0 0 0 0 1 300 DATA 2 can be set for 8 or 7 data bits and even odd or no parity Format is selected via switches on the main processor board as shown in Ta...

Page 135: ...o linked to AUDIO MUTE Since data errors will effect audio quality it may be desirable to disengage the audio and or switch to a back up or diversity system when significant error activity is detected This feature is analogous to SQUELCH on the STL receiver The source coding algorithm used in the DSP6000A actually masks data errors to a great extent Data errors are imperceptible in the audio for r...

Page 136: ... disabled externally via the STATUS connector J4 Auto mute is disabled by a low 0 VDC input on pin 8 This overrides the DIP switch setting temporarily Removing the low signal restores automatic muting to the setting determined by S2 M This feature is helpful for remote testing and troubleshooting 5 12 Scrambler Disable The encoder data is scrambled prior to transmission to prevent the occurrence o...

Page 137: ... 1 Ch Mode 2 Ch Mode 3 Ch Mode 4 Ch Mode 5 Ch Mode 6 Ch Mode 7 Ch Mode 8 Ch Mode 9 Ch Mode 10 Ch Mode 11 Ch Mode 12 Ch Mode 13 Ch Mode 14 Ch Mode 15 Interface 1 Interface 2 Interface 3 Interface 4 Interface 5 Interface 6 Scrambler Scrambler Description 4 x 15 kHz 1 x 4 8 kbps 3 x 15 kHz 1 x 4 8 kbps 1 x 9 6 kbps 2 x 1 5 kHz 1 x4 8 kbps 1 x 15 kHz 1 x 4 8 kbps 2 x 15 kHz 2 x 7 5 kHz 1 x 4 8 kbps 1 ...

Page 138: ...R A X X X X X X X X X X X X 0 0 0 X X X 1 0 0 X X X 0 1 0 X X X 1 1 0 X X X 0 0 1 X X X 1 0 1 X X X 0 1 1 X X X 1 1 1 X X X X X X 0 X X X X X 1 Function Description Ch Mode 0 4 x 15 kHz 1 x 4 8 kbps Ch Mode 1 3 x 15 kHz 1 x 4 8 kbps 1 x 9 6 kbps Ch Mode 2 2 x 15 kHz 1 x 4 8 kbps Ch Mode 3 1 x15kHz 1 x 4 8 kbps Ch Mode 4 2x15kHz 2x7 5kHz 1x4 8kbps 1x9 6kbps Ch Mode 5 2x15kHz 1x7 5kHz 1x4 8kbps 1x9 ...

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Page 141: ... Output 6 3 Board Alignment Information 6 3 1 Encoder 6 3 1 1 Encoder 1 0 Power Supply Board 6 3 1 2 Encoder Main Processor Board 6 3 1 3 Encoder Display Board 6 3 2 Decoder 6 3 2 1 Decoder 1 0 Power Supply Board 6 3 2 2 Decoder Main Processor 6 3 2 3 Decoder Display Board 6 4 Test Equipment 6 5 Test Fixture Diagrams DSP6000A 602 11157 61 R A Page 6 2 6 2 6 4 6 4 6 5 6 7 6 9 6 9 6 9 6 12 6 15 6 16...

Page 142: ...ing process Perceptually the audio is perfect Standard wideband distortion or SINAD measurements however will measure this quantizing noise that the ear does not hear We recommend measuring harmonic distortion using a spectrum analyzer and calculating the total harmonic content as described below The delta sigma DIA conversion process used in the DSP6000A on the other hand places the quantizing no...

Page 143: ... 22 kHz low pass filter on the analyzer Establish an audio level reference on the audio analyzer d Remove the sinewave input from the encoder e Measure the input level to the audio analyzer The signal to noise ratio is the difference between the reference level with the sinewave applied and the level with the sinewave removed This should be between 86 dB and 89 dB 3 Measuring digital signal to noi...

Page 144: ...ng process A traditional total harmonic distortion THO may be accomplished by measuring the amplitude of each harmonic on a spectrum analyzer THO is equal to the square root of the sum of the squares of the relative harmonic levels 6 2 Troubleshooting This section is intended to aid in troubleshooting the OSP6000A system in the event of a system failure In general first check the DIP switches for ...

Page 145: ... available for transfer alarm or other supervisory applications Energized when encoder is powered and no fault conditions exist 9 AES EBU Fault Active high alarm output when AES EBU receiver has lost data synchronization or frame synchronization with signal at AES EBU input Circuit expects AES EBU formatted btphase coded signal at 30 50 kHz sample rate This alarm s active independent of input mode...

Page 146: ...ons to ENCODE DATA OUT system clock Y1 encoder components U1 U22 U28 and peak detector U19 Check crystal clock Y1 programmable divider U1 and transition detector U18 Check processors US and U6 system clock Y1 processor clock Y2 AID convertor U4 timing generator U1 and transition detector U18 Check processors U15 and U16 system clock Y1 processor clock Y3 AID convertor U14 timing generator U8 and t...

Page 147: ...rgized n o when decoder is powered and no fault condition exists Relay contacts available for transfer alarm or other supervisory applications Energized n c when decoder is powered and no fault condition exists Active low logic input e g contact closure 0 volts provides override of automatic audio mute feature Active low indication of transmission data errors LED indication also available on front...

Page 148: ...5 7 11 0 3 S F 0 5 7 11 0 2 3 S F 0 5 7 11 0 2 3 S F 0 1 4 5 7 9 0 2 3 S F 1 4 5 7 9 0 3 S F 0 5 7 11 Troubleshooting Suggestions Check cables and connections to DECODE IN verify proper slicer level alignment eye pattern alignment as outlined in Sections 5 3 and 5 6 and transition detector U45 Verify proper decoder alignment and configuration Check VCXO U15 programmable divider U21 and transition ...

Page 149: ...le 6 5 Power Supply Section LOCATION COMMENTS CR3 Green LED indicator of active 15 VDC supply E1 PCB jumper disconnects 15 VDC power supply from remainder of board CR7 Green LED indicator of active 15 VDC supply E2 PCB jumper disconnects 15 VDC power supply from remainder of board CR12 Green LED indication of active 5 VDC supply Extinguished while RESET is activated E3 PCB jumper disconnects 5 VDC...

Page 150: ...e adjustment of Left channel input level PCB accessible jumper selects Left channel preemphasis Use only to compensate for de emphasized input audio Left audio level test point following balanced input circuit 6 9 VP P full scale PCB jumper removes XLR ground from Analog ground Rear panel accessible adjustment of Right channel input level PCB accessible jumper selects Right channel preemphasis Use...

Page 151: ... accessible adjustment of AUX 1 channel input level E11 PCB jumper selects AUX 1 channel preemphasis Use only to compensate for de emphasized input audio TP3 AUX 1 audio level test point following balanced input circuit 6 9 Vp p full scale E12 PCB jumper removes XLR ground from Analog ground R145 Rear panel accessible adjustment of AUX 2 channel input level E13 PCB accessible jumper selects AUX 2 ...

Page 152: ...ES EBU receiver s gI I o 1 i i i nction i 0 0 0 I No Error 0 0 1 Validity Bit High 0 1 0 j Confidence Flag 0 1 1 Slipped Sample 1 0 0 CRC Error 1 0 1 Parity Error 1 1 0 Bi Phase Coding Error L 1 1 1 No Lock External input sample frequency as determined by the AES EBU receiver F2 F1 FO 1 Freguency I i 0 0 0 Out o fRange i 0 0 1 48 kHz 4 I 0 1 0 44 1 kHz 4 0 1 1 32 kHz 4 1 0 0 48 kHz 400 ppm 1 O 1 4...

Page 153: ...m output level TP26 Modem output level test point 0 5 to 4 5 voe depending on channel bandwidth TP30 Encoded data output test point Table 6 10 Timing and Mode Control Location Comments S1 PCB DIP switch selects channel bandwidth external input and scrambler modes S2 PCB DIP switch selects DATA 1 and DATA 2 modes and spectral efficiency S7 Front panel accessible switch selects display bargraph mode...

Page 154: ...ollowing balanced input circuit 6 9 V P P full scale Table 6 13 Main Aux Data Multiplexer Location Comments CR6 Red LED illuminates when multiplexer is not working CR7 Red LED illuminates when TIME SLOT 0 GENERATOR is not working Table 6 14 Asynchronous Data Location S3 S4 55 56 CR28 CR29 Comments PCB DIP switch selects DATA 1 baud rate PCB DIP switch selects DATA 2 baud rate PCB DIP switch select...

Page 155: ...el 10 VDC full scale TP2 Bottom bargraph audio level 10 VDC full scale CR4 Green LED indicates Main Left Right audio levels are being displayed on bargraphs CR3 Green LED indicates AUX 1 and AUX 2 audio levels are being displayed on bargraphs CR6 Tricolor LED indicates status of AES EBU input OFF AES EBU mode not selected GREEN Good quality AES EBU input YELLOW Poor quality AES EBU input RED AES E...

Page 156: ...nects 15 voe power supply from remainder of board Green LED indicator of active 15 voe supply PCB jumper disconnects 15 voe power supply from remainder of board Green LED indication of active 5 voe supply Extinguished while RESET is activated PCB jumper disconnects 5 VDC power supply from remainder of board Reset switch rear panel accessible Resets major processor functions PCB jumper disconnects ...

Page 157: ... P full scale E6 PCB accessible jumper selects Left channel de emphasis Use only to compensate for preemphasized input audio R41 Rear panel accessible adjustment of Left channel output level E7 PCB jumper removes XLR ground from analog ground TP2 Right audio level test point as received from DIA circuitry 6 9 V P P full scale ES PCB accessible jumper selects Left channel de emphasis Use only to co...

Page 158: ...nel de emphasis Use only to compensate for preemphasized input audio Rear panel accessible adjustment of AUX 1 channel output level PCB jumper removes XLR ground from Analog ground AUX 2 audio level test point as received from DIA circuitry 6 9 VP P full scale PCB accessible jumper selects Left channel de emphasis Use only to compensate for preemphasized input audio Rear panel accessible adjustmen...

Page 159: ...GC mode Manual for test fast lock up but narrow input range AGC for normal operation 1 10 Vp p decoder input range R42 PCB assessible adjustment of AGC level TP2 AGC reference voltage adjusts with R42 TP3 Automatic gain control voltage Depends on input level and reference voltage between 0 2 and 5 VDC TP4 Data signal at AID input typically 1 5 1 7 Vp p TPS A D s most significant bit Used to set AI...

Page 160: ...st point following ringing circuit Maximum AC amplitude STD EFF only PCB accessible adjustment of RCLK symmetry STD EFF only RCLK symmetry test point 50 duty cycle square wave STD EFF only Test point for Data Clock 50 duty cycle square wave PCB accessible adjustment of sample phase Sample phase test point for aligning Data Clock to input signal PCB accessible adjustment of clock symmetry Sample Pu...

Page 161: ...y modes S4 PCB DIP switch selects DATA 1 and DATA 2 modes and FT1 DSP mode S7 Front panel accessible switch selects display bargraph mode Table 6 22 Channel Decoder Section Location Comments TP26 Modem data output test point after decoder before demux Table 6 23 Main Decoder Section Location Comments E1 Jumper connects Main Encoder clock to Aux Encoder CR27 Red LED illuminates when left APT decode...

Page 162: ...e CR27 Red LED illuminates when AUX 2 APT decoder loses sync TP40 AUX 2 audio output test point following D A output filtering 6 9 V p p full scale Table 6 25 Main Aux Data Multiplexer Location CR18 CR19 CR20 CR21 TP15 Comments Red LED illuminates when Encoder multiplexer is not working Red LED illuminates when time slot 0 receiver is out of sync three consecutive bad frames Red LED illuminates wh...

Page 163: ...n UNUSED DSP6000A 602 11157 61 R A Troubleshooting and Testing 6 23 Table 6 26 Asynchronous Data Location Comments S5 PCB DIP switch selects DATA 1 baud rate S6 PCB DIP switch selects DATA 2 baud rate Table 6 27 Spares Location Comments TP15 Unused test point TP16 Unused test point ...

Page 164: ...reen LED indicates Main Left Right audio levels are being displayed on bargraphs Green LED indicates AUX 1 and AUX 2 audio levels are being displayed on bargraphs Bicolor LED indicates status of incoming signal level Green sufficient signal Red insufficient signal Bicolor LED indicates status of signal synchronization Green system locked to signal Red system not locked to signal Red LED when illum...

Page 165: ...ommended Test Equipment Suggested Model Critical Specifications Tektronix DC 508A 1 3 GHz Better than 5 ppm Microlab FXR CB 49B 30 dB 1 0 2 0 GHz Philco 662A 30 or 50 ohm 30 dB 10W Sierra 661A 30 Kay Elemetrics Model 4320 50ohm 1 2 3 5 10 20 dB steps Hewlett Packard 339A Residual Noise Audio Precision System One 92 dB 80 kHz or Input Impedance Tektronix AA501 100 ohm shunted by with SG5050 and TM5...

Page 166: ... 8481A Power Head Oscilloscope Tektronix T932A Multimeter Data Precision Model 935 Critical Specifications Frequency Band 0 01 3 GHz Dynamic Range 70 dB Display Range Log 10 dB div and 1 dB div Display Accuracy Log 2 dB over full range Input Impedance 50ohm Accuracy 1 of full scale Power Range 25 dBm 3 uW to 20 dBm 100 mW full scale Bandwidth 35MHz Floating Input 3 5 digits DSP6000A 602 11157 61 R...

Page 167: ...5V 5 DATA 2 5 SYNC 13 E SPARE I 13 MUX 6 DATA 1 6 RELAY N O 14 E SPARE I 14 SYSTEM 7 MUX 7 E RELAY N C 15 PCM SYNC 15 E RELAY ARM TO GND LUG 8 E SPARE I D ECODER D8 9 P 1 DCD 6 2 RXD 7 3 8 E MUTE IN Figure 6 2 Status Test Fixtures 1 6 TO 2 OSCILLOSCOPE 7 3 8 4 9 TO 5 OSCILLOSCOPE ENCODER DB 9 p DSR RTS TXO TO SQUARE WAVF GENERATOR CTS E J OTO OSCILLOSCOPE DVM GND 4 0 TO SQUARE WAVE GENERATOR OSCIL...

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Page 170: ...IOrlc B I W 00 3 0t Qltl4 CRJO lit I 111 i INg I c U CRlt Ctl o i O u o Jo m fuo o ft f J J 11 I 1f ga m m ll 1rJ o IJ D 0 C A WI qff70 IJJovi 1 t o s n c 5 D t B f M t f C 1 tilt I _ u Q C Q 11 l CII 47 t 101 1 CIU J Ctn c J s ASSY RCV LEVEL 1 6 ASSY llEM I y mw t10122a TQlE RAt a c 11i Cl J J O O l6 17 01 0 t roti X O t 010 ttbele 1 9 111 CASTIUA tl OR CO lA CA 9 111 oos 1 1 EN1uo1t owe Silt 51 ...

Page 171: ...C MA EO Pil IOR TO FLOW SOlO Rlt C Drawings 7 4 INSTALL F Al 1 lAP tT I I 2 VN0 R 1 4 BEFORE F l OW SOl O RlNC CAREfULY SNAP Off FlANG S A D DISCARD Afmt ASSE BLY ffi1 tARKINC U 8 lltlG R Q O SH MOSELEY PROCESS SP C owe f PS J002 L JH 0 970 02 Trx tRA NCt 21 2 SOO I0 169 0J XX 1 oJO XXX _ 010 Maaelev 111 CASflUAH OR COU U CA 9 117 J Ql S UNLESS OTHEPl lSE SP CIFIED DSP60O0A 602 11157 01 R A 4 ASSE...

Page 172: ... ri 0oo n II rufo I o 0 l I q po IIJ il il 1 11 jj fl Do 4 17s d 0 o 1 E O ur i o O l LJ0 I I g 0 ol 1 0 0 1 nJ 0 o J J 1_ I _ 1 n_n O o e O d o o ll o fJ II j J J a 1 0c d Di w ooo O ii J I l I J i a 11 171 ii 1 o 3 c 0 00 o S o uLJo C 1 1 1 1o e i 0 j 0 1 I 1 j lJI d 9 i JI Gt i D r t JI I o l d g w c o ii JfoR gto O tlJ lio 0 JM Cl o E J O I 000 0 00 n o 0 I d 0 g o go o J 1111 ort I I 0 I Q 0 ...

Page 173: ...I f o OJ kltj 4 f 11 o LJ LJ tJ Cl u li Ji a M o oo 11 u1 bl ii t i l io L O 0 00 n o0 w o BQ E d 0000 00 0001 c w i Q o H cfo D 10 1111111 I B g 6 0 _ o i o p o a O 8 I I 0 w a O 1_ gcX c i I W Cl 0 8 3 t NOT INSlAllO IN PROOt lCTION liST tl f0 I WI 1A9t 11t lt UKO II 1 Y4 tuORC f OW 01 0 ltiHC r Alt flALY SNAP o r f AHttS ANO CMS Afl 0 0N A V 5 A SSC P R IPC A 810 Cl ASS J Ca _p1 A NOtto o TJ r0...

Page 174: ... 1 0 ruoF 10 o il or 1 11 o i i l l i 1 o Cl en t lJII w c c V O hll Y ti L___J a IJ ot f r ffe qJg j I I c J O c J N ARSIDE 2 Pl CS rARSIO 2 PLCS Ht S OC ASS R Y l V L 2nd ASSY ASSY 01 I _ Drawings 7 6 20 i ioi tlOn e lOlDtA t _ _1 T KO 17 01 n I mo lCDl 010 111 CASTIUAf CR CQ TA CA 9 3117 Decoder 1 0 Power Supply PCB Assembly 2083059 R F 800 1QI OIIC DSP 6000A DEC 1 0 PWR SPLY _ _ 20B3059 F 00 M...

Page 175: ... 2 PLCS 2 PLCS DASH 1 ONLY INSTALL CRI THRU CR9 ON FARSIDE USING FIXTURE SKC6692 DASH 2 ONLY INSTALL CRI THRU CR 4 CR6 CR7 ON FARSIDE USING FIXTURE SKC6692 UNLESS OTHERWISE SPECIFIED ITEM I01Y I DESCRIPTION I PART NO I ENDOR PCB 1C6134 t R C J 2 111 CASTIUAN OR I ITEM NO SCH 91D7482 xx t OlO xxx o1o GOLETA CAur 93117 L 1 2 DASH 1 I DASH 2 APP OVALS I OAT DISPLAY BOARD DECODER I ENCODER OWII D A 6 ...

Page 176: ...ECIFIED 2 PLCS SEE DETAIL B o I 1 JIJt tPERS DSP DC Option Assembly 910 11279 01 R A laa J 0 loo 0 Vl W A A t OPT 1 01 fir OPT 1 0 O 5 1 6 1 6 Pl Vu DETAIL A 101 0NCt 1 T Djo I XXJr O IO P2 Vu DETAIL B Mmlll IU CA S JA f Olt GOl tA CA tJU7 n t 1l o wl n DSP6000A ENC DEC f ccoo _ 1 c o P DC OPTION SiCAL u ltwK 9i 1 NC 910 11279 01 A Drawings 7 9 ...

Page 177: ... TO BE INSTALLED PER MOSELEY PS3001 SEC 2 0 2 P1 P2 b RADIAL LEADED COMPONENTS TO BE INSTALLED PER MOSELEY PS3001 SEC 2 0 1 NOTES UNLESS OTHERWISE SPECIFIED Pee J47 05084 01 TOI ERANCE 4 tl 2 SCHEU 1100 IOIJB 01 XX I OJO x x I 010 DOS flLCNAM owe SIZE 1129a owe 1 l APP tOVALS OAT Mc 111 CASTILIAN OR GOLETA CA 9J117 coo NOT sc u owe o c H J AP11 91 I 1 _ 930 11298 011 c A DSP 6000A PWR SPLY DSP6000...

Page 178: ...www SteamPoweredRadio Com ...

Page 179: ... 4 7K CR4 GRN 15V ANALOG CND Jl Al J1 A2 J1 A25 J1 A27 L2 15V J1 A28 E2 J1 C25 J1 C28 15V J1 C29 2500 R2 J1 C30 4 7K J1 C31 CR7 GRN J1 C32 1sv ANALOG CNO 15V 5V E3 _ 8 vcc CR10 RJ R4 01 1002 UK 14 0K J 2N6400 1 1 OV 1 ORV 1 4 UV Ul 2 9V SENSE MC3425 3 ov 2 W SENSE UV 6 IND RS R6 14 0K 10 0K S1 1 1 C17 RESET 1 PCB 347 04657 01 ASSY 2063058 DO NOT SCALE OWG SCALE NONE SHEET 1 OF 5 Jl AJ J1 A4 Jl AS ...

Page 180: ... I RR I 2 3 JI C22 l H 9 TP7 NC MUX FAULT 1 4 5 JI C23 I JI C24 PCM SYNC 12 11 NC H 7 NC I Jl A22 RELAY N0 J1 A23 RELAY NC I RELAY ARM I J1 A24 I C J r II Q STATUS 1 0 J4 I_ACTI RN2 OWOUTPUT 1 1 A 1 SPARE C 3 V v L C44 100 oo w m 2 AA 13 9 AES BU FAULT C 5 1 V V 1 C46 100 ACTI HICH oo w m J A A n 2 SYST M FAULT C47 L vv L C48 001w 100 in 1 4 AA 11 C49 L oo J_ cso 10 MODEM FAULT oo w in 1 5 10 AA 3...

Page 181: ...1 fT1 lRANSMIT wt DATA 15V 15V 0 0 FT1 lRANSMIT ENCODE OUT DATA J1 C27 E14 C88 i001 FT1 lRANSMIT CLK FT1 TRANSMIT CLK C76 COMMON 1 COMMON J1 C9 MAIN AES l BU IN J1 C10 EXT RECEIVE DATA EXT REC 1VE DATA 5V EXT REC IVE CLK EXT REC 1VE CLK PCB 347 04657 01 ASSY 2083058 DO NOT SCALE DWG SCALE NONE SHEET 3 OF 5 IP8 i J7 ENCODE SIGNAL OUT J8 ACC J5 2 1 CN1 AES l BU INPUT 3 TOLERANCE c 1 2 XX 030 XXX 010...

Page 182: ...OK R56 C109 15V INPUT LE L RBO OK RSI 15V IN OUT IN OUT Cll3 SpF R59 R63 TPI IK LHT MAIN LE L 6 9Vpp 100 15V IOK E7 OE EMPHASIS SELECT C112r JI A32 00 20 FT AUDIO OUT 0 OK 0 EMPH LEFT RIGHT R61 R86 25 s 2 49K 1 2 49K 1 SOus 4 99K 1 4 99K 1 75 s STD 7 50K IX 7 50K 1 ZIN LEFT RIGHT R41 R66 600 OHMS BAL STD 681 681 rn 600 OHMS UNBAL 63 1 IX 634 150 OHMS BAL 154 1 154 1 150 OHMS UNBAL 150 1 150 1 C12S...

Page 183: ...5V t R 21 C149 15V R1 46 C1 64 15V C1 53 R128 l1 V f r O TPJ DE EMPHASIS DE EMPHASIS IN C1 66 T 01 3 1 PCB 347 04657 01 ASSY 2083058 DO NOT SCALE DWG SCALE NONE SHEET 5 OF 5 5pF R 24 15V 10K 29 54 il OE EMPH 25us 50us 75us STD ZIN 600 OHM S BAL STD 600 OHMS UNBAL 150 OHi iS BAL 150 OHMS UNBAL C1 68 Spf R149 U13A lOK 1 sv IK AUX 1 LEVEL 6 9VW 1 00 1 00 20 AUX 1 OUT 5 Cl52 Jt A30 OK AUX 1 AUX 2 R126...

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Page 185: ...M FAULT FAULT OUT MCLKB 18 192 MHzl DO A HWY CLK DIG HWY AUX SYNC MAIN DATA AUX DATA UAIN SHIFT MOOEM nn L UODEM DO M FIi DO nr rm rT37 ffil rEl r 151 nn fTa7 r197 f i iol mn rm nw _ MAIN CH ENCOOER jMAIN CH A 0 r fj6 rflTI flilfl fT 91 rm f T2fl M rm rmi rf247 rmi 11w fi v7 msi f iigl ITiol fT ltl rm rm MULTIPLEXER 1341 ms rm _ rm nm f lisl VCCINH TPI lJ SIG OUT 4 24 576MH EXT MCI I IN 5 MOOE 66 ...

Page 186: ... Cl 1 SYNC r I ECT 2 RU14 lllll N C u1 lXM AUX DATA NAOII iY AUTO YNC NAOI I AIIOO 52 Q j U5 A001 53 llll APl X 100E A002 SYNC NCOOER Al O SAIJD LEFT AB04 1 INl Al O 64 DO N ABOG 60 OLIJ Ano 68 IACK AA08 57 ILD AB09 58 ICK ABIO 59 OCK Allll 67 A8I2 CKI 83 SYNC Al I AB13 66 RSTB ABl 1 56 01 ABl5 l DO cv o vss R23 4 7K l_ l 2_1 1 211 541 651 691 0 f v w DOEN_R OlD_R I IACK R DO_M ILD_R ICK R r OCK_M...

Page 187: ... T54 T55 TS6 T57 T58 AUX ENCODER TIMING T59 T60 T61 T62 T63 rrrn I T65 A 0 I T66 f T73 fTH AUX OATA2 I T75 Oifil_ sv C70 U9 16 7C403 2 V 15 MAIN SH OUT MAIN_SI 3 IR so 14 SI OR I IT341 MAIN DATA 4 DO 00 13 MAIN HWY 5 12 Dl 01 11 D2 02 10 D3 03 I MR or VDD 17 f sv C71 UlO 7C403 16 IS AUX SH OUT AUX_SI IR so 14 SI OR rm AUX DATA 4 DO 00 iJ AUX HWY Dl 01 12 i T 0 02 02 10 0 03 03I MR or voo I w I ELA...

Page 188: ... 6 v E4 52 OSE iTJ 53 IBF o o R69 2 2K62 SYNC SADD CLKBKUP INT T S 41 D O EN 1__ c 64 DOEN 155 OLD 1 60 OLD IACK 1 68 IACK ILD 1 57 ILD 151 153 152 ICK_l 58 ICK 156 OCK_A 59 OCK L __4 _ _ 6 1 7 CKI ll 577 c T 57 c SYN C A _ __ l t c 83 i SYNC_APT UIS APT X 100f ENCODER AUX1 ABOO 32 A801 31 A802 30 AB03 29 A804 ABOS A806 AB07 ABOB AB09 26 25 24 23 22 20 A810 19 A811 18 AB12 15 A813 14 AB14 13 P1 A3...

Page 189: ...ED AES FLT OUT 15 FAULT RELAY T49 J2 12 8 U20 AE5 iEBU DIS LAY 4LS240 RED 6 N C P1 A23 T28 FAULT OUT 2 J2 10 sv 1 ARM P1 A24 FAULT 8 U20 O PLAY NO P1 A22 4LS240 RED I SYS FAULT 0 P1 C16 Kl a R93 1K CLK FAULT CW 0 a co 9 0 P1 C19 0 0 co a MAIN FAULT 0 P1 C18 It AUX FAULT C CI E Q P1 C20 STATUS OUTPUT ACTIVE LOW T24 0 MODEM FAULT P1 C17 1 1 Q 0 D IB MUXFAULT MUX FAULT P1 C23 C cii E T27 ITT PCM CLK ...

Page 190: ...FILTER 11 R129 4 58 tw C160 1 Too22 o 2 5 C161 0033 5 15V 15V 6 R133 9 C164 T 001 w 5 HIGH ffF STD Eff PLT STD Eff C165 C175 0047 00022 2 5 2 5 15V 35 66 lw TP 31 ACNO J OUTPUT LEVEL ES R138 10K OUTPUT LEVEL ADJ TP 33 ACND J PCB 347 04970 02 TOLERANCE L 1 2 STD ASSY 930 06558 02 xx 030 xxx 010 ENH ASSY 930 11180 02 DOS FILENAME DWG SIZE 10469 FC DWG A APPROVALS DATE DO NOT SCALE DWG OWN D A 1 27 9...

Page 191: ...F MO Ml M2 M3 SEL EO E1 E2 FO Fl 12 26 11 25 28 23 24 18 17 16 6 5 4 3 2 27 SCLK M 1 SDATA AES 1 FSYNC ES 1 sv E4 12 1024 1152 1536K 4 3 32 44 1 48K 6 ERF 5 VERF sv VERF P1 C14 10 1 SRC BYPASS 0 NORMAL 18 BCLK_I BCLK_O 26 DATA_I DATA_O 23 LR_I LR_O 24 FSYNC WCLK_I WCLK_O 25 MUTE_O 16 MUTE_I 15 5V BKPOU VDD7 TRGLR_I VDD22 MSBDLY_I BKPOL_O TRGLR_O MS80LY_O GN08 SETSLW GN021 GN014 l 1 4 U33 GN027 1 c...

Page 192: ...CM CLK IN FTI RPTR PCM DATA IN RESET ITIII AES EBU FAULT N C SYSTEM FAULT m MOOEM FAULT ill MAIN ENCODER ffiTI SYSTEM CLOCK El AUX ENCODER ITI DATA2 ASYNC ERR DATA1 ASYNC ERR CTrn MUX FAULT PCM CLK SYNC 15V 15V ID ENCOOE OUT P1 C A CONNECTOR DETAILS 1 2 3 4 5 6 7 8 9 DGND 10 11 12 13 14 CLOCK OUT FT1 TI DATA OUT FTl TIID jN C FAULT RELAY NO FAULT RELAY NC FAULT RELAY ARM 15V AGND AUX 2 AUDIO AUX 1...

Page 193: ... cc 1 r _ AM27C1024 120JC 14 g ovcc 15 7 20 0K 21 _ 8 ___ __ _ C_LK i v 1 1 H 5731B P SVD 3 11 4 U32 I L2 R50 R1 4 CB 2 MC39082 470 5V 20 0K f R1 t I 5V c79 d U35 l 1 5V I U29 W 2f OK 2a 1 1 L llE2 M w5 CE r b 1 A15 11 W f j __ _ __ __ z J OAGGNNOD 27 4 I ou 1 V SVA R16 R17 R18 2 gB1 REF_OUT 2 C541 I 1 20 OK t 1OK g J2 CTL_OUTI 2 1 I ri _ ______ 1 C59 gg h4 I CTUN R40 976 SPF I D013 I RSET V J _ 0...

Page 194: ...www SteamPoweredRadio Com DSP6000A 602 11157 01 R A This page is7ntenTionally b7ank D ngs 7 26 ...

Page 195: ...ISV 15V JI Al J1 A2 JI A27 J1 A28 J1 C28 J1 C29 J1 C30 JI CJI J1 C32 NALOG GNO J1 A3 J1 A4 J1 A5 J1 A6 J1 A7 J1 A8 J1 A9 JI A10 J1 A11 JI A12 JI A13 J1 A14 JI A15 JI A16 JI A17 JI A18 JI Cl J1 C2 JI C3 JI C4 323A 0 l 4___ _ r r Lc sv 8 CII C13 G 2700 22 35V 35V fl Pl 25A 240V fll 2 UN F1L1 R L GNO N 3 N 240V CONNECTION E4 ANALOG GND _ O GITAL GND r 7 CHASSIS GND 17 L G N D CIS 2 2 35V CRIO 1002 R3...

Page 196: ... fAULT 4 5 PCM NC 12 11 NC i H __NC I RELAY NO RELAY N C RELAY ARM STAWS 1 0 J4 RN2 _ACTIVE OW OUTPUT 1 v V 14 1 C43 1 C44 001w 100 1n1 2 A A 1J 9 C4S J vv J C46 001w 100 m 1 3 12 2 C47 l vv L C48 001w 100 m 1 4 vv 11 10 C49 J J cso 001 iffe 100 m 1 5 A A 10 3 C51 J vv L C52 001 iffe 100 1n1 6 9 11 C53 l vv _L_ C54 001 t 100 m 1 7 vv 8 4 C55 J 1 C56 001w 100 1n1 SPARE AES EBU fAULT ACTIVE HIGH SYS...

Page 197: ...VE C176 47 C178 s fu R31 7 120 IOOpF R32 IOOpf DATA J4 12 5 SV R33 C180 4 C182 100pF 100pf R l 4 120 100pF 100pf R35 r _ __ _ ______ 6 F11 RECEIV CU 47 INT R ACE Rl9 R21 R20 STANOARO R22 R24 R2l RS 422 10 NONE V 35 IK 100 TP8 J1I C27 DECODE IN C88 001 FROU STEREO GEN ES PCB 347 04665 01 ASSY 2083059 DO NOT SCALE OWG SCALE NONE SHEET 3 OF 5 0 J7 DECODE SlGNAl IN J8 ACC TOLERANCE L 1 2 XX 030 XXX 01...

Page 198: ... 2 40K 1 15V R65 1 604 1 CR13 1002 R59 15V CRIS 1002 R67 60 4 1 R64 R94 1 60 4 1 CR17 CR18 1002 1002 R88 15V 15V CR1 9 CR20 1002 1002 R96 60 4 1 UAIN LffT AUOIO OUT L3 J9 2500 R66 10 0K GNO Ill LIFT 1 GNO 7 C126 Ii I R68 10 0K L4 1 R95 10 0K 1 R97 2500 3 SHELL 20UT 600 OHMS BAL STD L0 2 100 OHUS BAL UAIN RIGHT AUDIO OUT LS J10 K2 2500 GNO LIFT l __ k I GNO E9 C127 Ii I 10 0K L6 1 1 3 2500 SHELL PR...

Page 199: ... BAL STD LO Z 100 OHUS BAL OUTPUT SELECT L9 PRE EUPH AUX 1 AUX 2 R116 Rl45 25us 2 49K 249K 50us 4 991 4 99K 75us STD 7 5 1 7 SOK AUX 1 AUX 2 Rl20 Rl24 R149 Rl53 Rl33 Rl34 R162 Rl63 1 50K 17 300 17 I SOK 17 300 17 1 20K 17 40 2 17 1 20K 17 40 2 17 AUX 2 AUDIO OUT OR AES EBU OUT J13 1P W l R154 r Rl 5 5 2 40KV vl 1 r 1 VV r 1 2500 E 13 lclc il L AN A_L_OG_ __ 2 60 4 17 AEB EBU Rl56 2 40K 17 Rl57 2 4...

Page 200: ...www SteamPoweredRadio Com DSP6000A 602 11157 01 R A This page ts1ntenfiona1ly blank Di gs 7 32 ...

Page 201: ... OFFSET SVA 10 20V 3 7 GNDA VCCA VI A D U9 TOA8703 DIP24 11 OF UF C38 R115 VR2 78L05 G R16 10 0K 1 R117 267 1 5V vcco 19 VCCD 18 C41 1 GNDD 20 SV DO 2 AD_DO DI 1 AD_D1 02 24 AD_D2 DJ 23 AD_03 04 15 AD_D4 fJO 0 3 04 Vdc AGC MOOE R50 7 35V DEC DS 14 AD_D5 06 13 AD_D6 Dl 12 AD_D7 lSV 9 1K R51 4 1K 17 CLK CLK 022 47pF 16 C42 1 SCHEM ITEM NO 600 10563 01 TOLERANCE ASSY 2083109 FRACT 1 32 XX 030 XXX 010...

Page 202: ...R4 IN52408 QUAD DETECTOR R101 10 CRS IN52408 I css L0TJ T _7___J_ cR C LK 1cD IV O C____________ ll 15V 1 T 4 J_i R C LK D IV _QO______________________________l ___7 3 X IN U17 FLAGS THIS PAGE OTI CEJ 00 ID iT40 mil 1 T88L IT89 REFERENCE DESIGNATORS THIS PAGE CR4 CR5 CR9 CR12 CR14 R53 R66 R76 R92 R99 R113 C46 C60 C64 C80_ C83 C92 C282 01 03 TP8 TP21 Ul O U11 U13 U15 U17 U19 E5 E8 H0R2 Ll J2 Pl Yl ...

Page 203: ...7 OO N_R 00 _3 Q 48 OLD_R I 81 22 U21 65 DI M 82 23 58 DO M I 1020A 83 39 26M1177 49 W A8 M Eff f f I 17 _ MAIN 44 XIN M 41 CLAS M PLCC84 PILOT 12 42 DOBM M 7RCLK_OS 13 LOS_R_OS D CLK 75 LOS_2_0S fll DSP 16 PRB 6 LOS L_OS 10 LOS 1_0S J1 35 DMUX FAULT I NC 69 BIT SYNC r 9 SlGNAL_OS I n ol ClK AD 80 8 BER_OS I T91 I DAIAl _O 76 BER FLAC_OUT I rn2 I DAT 1J MUTE_OUT I T9J I DAT A__ 3 2 37 FAULT_OUT I ...

Page 204: ...6 SYNCAPT RSTB AB03 29 AB04 ABOS AB06 AB07 AB08 AB09 ABIO 19 AB11 18 AB12 15 AB13 14 AB14 13 AB15 12 R811 DEMUX MOOE O 2 OEMUX MODE I 84 CHANNEL SELECT O1 8 2______ t CHANNEL SELECT 11 8_1__ t 5V C133 MAIN AES EBU TRANSMITTER 56 DI 7 16 21 R137 4 7K INT_R OLD_R DOEN_R IACK_R ILD_M ICK_M OCK_M APTCLK_M SYNC M RESET OI_M FLAGS THIS PAGE 00 _6_1_ CKO 33 DO_M R139 65 69 80 4 7K 5v R140 2 2K QQJ IRIGHT...

Page 205: ...4 57 27 22 21 24 16 15 20 23 53 9 1 83 10 11 47 17 62 56 58 59 63 69 70 71 sv 4 12526 33 46167 68 vcc vcc vcc VPP vccvccvcc U31 1020A AUX PLCC84 26M1179 PRA PRB DCLK SOI MODE GNO GNO GND GNO GNO GNO 18 191 40 I oul 611 821 w SCHEM ITEM NO ASSY PCB I 76 MAIN SH OUT 77 MAIN SH IN 81 AUX SH IN 79 MR 80 AUX SH OUT 7 TSO GEN rJr 54 DMUX ERR T39 50 IACK 1 T60 49 INT_l T61 51 DOEN_l T62 52 OLD 1 T63 34 O...

Page 206: ...NNEL S LECT 0 RB13 CHANNEL SELECT 1 RB14 CHANNEL S LECT 2 RB15 OLD TIMING RXM AUX DATA ENABLE AUTOSYNC ENABLE ABOO OSE ABOl U36 IBF A802 APT X 1000 AB03 SAOO OSP 16A AB04 SYNC DECODER ABOS INT AUX 2 ODEN AB06 PLCC84 OLD A807 IACK ABOS ILD AB09 ICK AB10 OCK AB11 CKI AB12 SYNC_APT AB13 RSTB A814 DI AB15 DO vss CKO 11 161 211 211 541 651 691 801 w 73 74 72 11 I 10 9 8 5 4 3 2 84 __ 82 81 77 76 75 32 ...

Page 207: ...Y YELLOW 0 C r i e Q STATUS LOGIC MU E RELAY RCLK OS 133 6 N C P1 C23 5V ARM SQUELCH P1 C24 LOS_L_OS 137 NO P1 C22 I Kl T44 MUTE_OUT m a LOS_R_OS T35 t mm P1 C20sTATUS m 0 U19D co LOS_2_0S 136 74LS240 45 FAULT OUT FAULT 0 J2 10 D PLAY I RED 19 150 J SYS ca PI A23 FAULT c m Q P1 C16 FAULT J PI C15 MAIN DECODER ti FAULT LOS_l_OS P1 C19 AUX DECODER 0 FAULT tn I Q J 0 0 C SIGNAL OS P1 C18 cossor tis S...

Page 208: ... 2 3 4 5 6 7 8 9 DGND 10 11 12 13 14 DATA ERROR DEMUX FAULT 39 SYSTEM FAULT T45 MUTE DISABLE M7 15V 15V AGND AUX 2 AUDIO AUX 1 AUDIO MAIN RIGHT AUDIO MAIN LEFT AUDIO p 1 1 3 I LK Q 6 CLR U20D 74ACTQO DIP14 5V U22A 74ACT74 DIP16 Jl J2 L 1_SIG AGND 3 R 2 SIG 4 o 5 6 7 8 9 1sv 10 11 AGNO 12 15V 13 14 15V lc24ol c241 910 2ov UART 5V C63 vcc NC I 4 GND U29 RDE COM8017P DATA8 5 ROB 8502P DATA7 6 RDl DIP...

Page 209: ...6 Sn CRII s s A BU 74 SOO u s 74LSOO 5V SV Cl 101 ia UIA TL074 cs 10 UIC n 074 15v CRH IN 41 RIJ LEH AUX I LEVEL DISPLAY 2 X ll v r CR12 15V CR13 IH4154 TPI Liff AUXI IOV s l C2 I_ WJSV RIGHT AUX 2 LEVEL DISPLAY 1P2 QH VX2 ovrs 1K 15V c MOO SC tl5V C8 v U2 1 Ml91S 710 1 D l l 111 I r ll ll I J l l r J _2 1 t I r 1 l d B I I r I I 12d8 15d8 f t w H IO ll I I r 1 I 2 1 c l l 2 4 2 7 d l SY t t J 1 V...

Page 210: ...l Voot VOi TAG PART NO A 8 C 0 E NWTl205 15H 4 J 2 5 8 l2VOC l9J0 11298 01I NWTl205 15 7 8 1 J 5 0 11205 15 2 I 4 6 8 NWl2405 15H 4 J 2 5 8 24VOC I 9J0 11299 0I I NWT2405 l5 8 1 J 5 0 12405 15 2 I 4 6 8 NWT4805 15H 4 l 2 5 8 48VOC I 9JO IIJ00 0I I NWl4805 15 7 8 1 J 5 0 14805 15 2 I 4 6 8 ASSY SCE CHJ T TOlERANCE i 1 2 fJloiaeler PCB J 47 050f 4 0l XX i 0 0 XXX 010 f DOS flL NAM owe SlZE 5V r 2 5 ...

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Page 212: ...m Appendix Section Contents A 1 Path Evaluation Information A 2 Spectral Efficiency A 3 AES EBU Digital Audio Data Format A 3 1 AES EBU Standard A 3 2 DSP6000A AES EBU Output DSP6000A 602 11157 AA1 R A Page A 2 A 2 A 5 A 5 A 7 ...

Page 213: ...92 For comparison the threshold for analog composite transmission for 60 dB de emphasized SNR is 67 dBm 100 µV Two channel digital transmission standard efficiency requires 93 dBm 5 µV of received signal strength to produce 90 dB flat SNR The system gain advantage for digital transmission is 26 dB A 2 Spectral Efficiency The DSP6000A is configurable for two spectral efficiencies RF spectral effici...

Page 214: ... 200 64 120 11 64 64 110 32 70 Which Efficiency Do I Use Higher spectral efficiency is not free It is achieved at the expense of reduced threshold performance This is seen in comparing the spectral occupancy of Table A 3 with threshold performance of Table A 1 High efficiency utilizes half of the RF bandwidth of standard efficiency but requires about 8 dB more received signal Thus the DSP6000A sys...

Page 215: ...ciency can be further increased by reducing modulation index h at the expense of threshold performance For a 6 dB loss of threshold a minimum additional 25 spectral efficiency can be realized A comparison of the spectrum produced at each efficiency mode at a transmission rate of 256 kbps is shown in Figure A 1 It should be noted that unlike traditional FM with audio modulation the digitally modula...

Page 216: ... DSP6000A decoder outputs digital audio at a sample rate of 32 kHz Each frame consists of two 32 bit subframes one subframe for the left channel and one for the right The left and right channels are time division multiplexed into one serial data stream at a rate of 2 x 32 bits x 32 kHz 2 048 Mbps The frames are arranged into blocks comprising 192 frames each PREAMBL ES x y I SU8 fRAME SUB fRA E _j...

Page 217: ...or block For transmitting an 8 bit word within these four bits and to ensure that no data bit can imitate the preamble the biphase format is violated and a bit is transmitted with each clock Valid are the three preambles B M and W which depending on the preceding bit PARITY BIT are selected in such a way that the status for the data stream always changes with the first bit of the SYNC PREAMBLE Pre...

Page 218: ...information or can be used for expanding the audio information to 24 bits Audio Sample Word The audio information is always transmitted as linear twos complements with the most significant bit in position 27 If fewer than 20 bits are required the excess bits are set to zero On the DSP6000A bits 8 through 11 are always zero Validity Flag The validity flag is normally 0 When it is set to 1 this mean...

Page 219: ...wn below Table A 6 DSP6000A AES EBU Channel Status Bit Assignment bit Description Comment 0 7 Control Always zero 8 15 Category Code General category 16 191 Reserved Always zero Parity Bit A parity bit is generated and transmitted for detecting errors in the transmission Jhe parity bit is zero when the number of bits transmitted as logic one from bits 4 through 30 is even DSP6000A 602 11157 AA1 R ...

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