Orban 464A Operating Manual Download Page 1

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Summary of Contents for 464A

Page 1: ...Operating Manual The Co Operator Gated Leveler Compressor High Frequency Limiter Peak Clipper Model 464A...

Page 2: ...MOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE PERSONNEL WARNING l TO REDUCE THE RISK OF FIRE OR ELECTRICAL SHOCK DO NOT EXPOSE THIS APPLIANCE TO RAIN OR MOIS...

Page 3: ...Operating Manual The Co Operator Gated Leveler Compressor High Frequency Umiter Peak Clipper Model 464A...

Page 4: ...emark of Dolby Laboratories Inc This Orban product has been manufactured by AKG Acoustics Inc This manual is part number 95059 000 03 300 FB 1 93 Copyright 1993 by AKG Acoustics Inc 1525 Alvarado Stre...

Page 5: ...3 Operation Controls and Meters Recommended Control Settings More About Co Operator Audio Processing 4 1 Section 4 Maintenance Routine Maintenance Getting Inside the Chassis Performance Evaluation 5 i...

Page 6: ...gh SPL environments 1 4 hum 5 2 impedance 2 5 input attenuator 3 8 6 5 balanced 2 7 buffer 6 5 impedance 2 5 level 2 5 6 8 stages 4 3 overload point 2 5 unbalanced 2 8 installation 2 1 FM broadcast 2...

Page 7: ...page contents 1 3 The Orban Co Operator 1 2 Fig 1 1 Front and Rear Panels i 4 Applications i 6 Registration Warranty Feedback...

Page 8: ...in CAUTION OltCttON AOAit 1 TMf JAMf IYM vA Orban Model 464A...

Page 9: ...se shape are adjustable to optimize processing for music or voice A defeatable silence gate prevents noise rush up holes pumping and breathing by inhibiting sudden gain increases once the signal level...

Page 10: ...es from overload during transfer On mic channels the Co Operator s smoothness and silence gating guarantee uniform punchy voice quality without noise rush up during pauses Cassette Duplication Even wi...

Page 11: ...ed clipping avoids clipping of the power ampli fier which can cause sticking instability and other audible problems Broadcast Studio Transmitter Link Protection The STL is often the weak link in the b...

Page 12: ...Zip Country Nature of your product application How did you hear about this product Purchased from Comments Which magazines do you find the most useful to your job dB Magazine Mix Radio World TV Broadc...

Page 13: ...mphasis and Clipper Defeat Jumpers Fig 2 2 AC Power Cord Color Code Audio Wiring Connectors Levels Grounding Power Audio Difficult Situations Fig 2 3 Some Possible Grounding Schemes Installation FM Tr...

Page 14: ...gistration Card 1 Operating Manual 2 Reposition clipper defeat and pre emphasis jumpers optional A list of recommended jumper positions for various applications begins on page 3 4 If you want to repos...

Page 15: ...Co Operator INSTALLATION 2 3 Fig 2 1 Pre Emphasis and Clipper Defeat Jumpers...

Page 16: ...EC standard mains connector and an RF filter designed to meet the standards of all international safety authori ties The power cord is terminated in a U Ground plug USA standard or CEE7 7 plug Contine...

Page 17: ...nals with 5 screw A inch tip ring sleeve phone jacks or XLR type jacks Levels Nominal input level is between 10 and 8dBu The absolute overload point is 20dBu OdBu 0 775V RMS for this application the d...

Page 18: ...OW GREEN Fig 2 2 AC Power Cord Color Coding I out r iN out Hn i OUT1 UNBALANCED DRIVING EQUIPMENT I nIN OUT1 UNBALANCED I HI HI ORBAN I UNIT I LO LO I i o I h M1 rfr J CHASSIS GROUND j RACK OR POWER L...

Page 19: ...re is a power fault to the chassis death could result Circuit To maintain the same potential in all equipment the circuit audio grounds must be connected together In a simple one studio system the con...

Page 20: ...licable If you follow Fig 2 3 and hum or noise appears don t be afraid to experiment If the noise sounds like a low level crackling buzz then probably there isn t enough grounding Try connecting the L...

Page 21: ...bias calibrating its PEAK OUTPUT LEVEL meters and clipping level then setting controls for normal operation An optional security cover can be installed to protect control settings 1 Defeat your trans...

Page 22: ...common program material To reduce clipper bias turn CLIPPER BIAS trimmer R2 fully counterclockwise NOTE If you readjust this trimmer in the future you must also recalibrate the Co Operator s clipping...

Page 23: ...of the L peak output LEVEL meter just lights The L PEAK OUTPUT LEVEL meter is now calibrated so that 3 corre sponds to 100 modulation of the transmitter h Turn the transmitter off 1 1 Calibrate clipp...

Page 24: ...ck and similar formats Level control may not be desirable in some situations such as with classical music intended for serious listening The following assumes that a VU meter is used to determine line...

Page 25: ...peak operating level 13 Repeat steps 10 11 and 12 for the right channel Use the right channel controls and meters instead of the left If the Co Operator will be used for mono this will prepare a secon...

Page 26: ...ss the output terminals Co Operators with serial numbers below 1306000 had a 93a output impedance If the load impedance of one of these is changed from 10RQ to 600a the output level will change by abo...

Page 27: ...series with each leg of the Co Operator s balanced out put to ensure that the phone line is driven by a true 600 ohm source impedance The 17dBu must be measured on the phone line side of the resistors...

Page 28: ...2 16 INSTALLATION Orban Model 464A Notes...

Page 29: ...page contents 3 2 Co Operator Controls and Meters 3 4 Example Control Settings 3 8 More About Co Operator Audio Processing...

Page 30: ...N meters show the true peak gain reduction in dB If the red LED at the far right of the bargraph lights no further gain reduction is available HF LIMITing Indicators light when HF limiting occurs PEAK...

Page 31: ...substantially higher than the threshold of leveling compression is only activated by those transients that are too fast for the slower attack time of the leveling circuitry Program material that has a...

Page 32: ...es that only safety and high frequency limiting are wanted If leveling is also desired use Broadcast Transmission settings METER CAL HF LIMIT PRE EMPHASIS INPUT ATTEN GATE THRESH RELEASE TIME REL SHAP...

Page 33: ...3 3 THD HF LIMIT PRE EMPHASIS 50ns INPUT ATTEN for G R equal to the amount of leveling wanted GATE THRESH 5 RELEASE TIME 6 REL SHAPE SOFT LEVEL ON COMPR OFF HF LIMIT OPERATE Clipper jumper DEFEAT Typ...

Page 34: ...Clipper jumper DEFEAT Cassette Duplication METER CAL 3 3 THD level from tape HF LIMIT PRE EMPHASIS 75 i s for FeO or CrO with Dolby HX Pro 100 i s for CrU2 without HX Pro processing INPUT ATTEN for G...

Page 35: ...Sound System Protection Attended Bi amped System Place the Co Operator after the crossover Use one channel for low frequency the other for high frequency METER CAL HF LIMIT PRE EMPHASIS INPUT ATTEN GA...

Page 36: ...program Its purpose is to prevent unnatural exaggeration of such material If needed a conventional noise gate can be used before the Co Operator Be careful not to adjust the controls to produce so muc...

Page 37: ...buttons are pressed during heavily processed program material Since their short release times preclude stereo imaging problems the high frequency limiters remain in DUAL mode each channel operating in...

Page 38: ...p that is too powerful for the driver in which case you might want to clip the input to the power amp substantially below the amp s own clipping point and or use the Co Operator s leveling function to...

Page 39: ...page contents i 2 Routine Maintenance i 2 Getting Inside the Chassis i 3 Performance Evaluation...

Page 40: ...n the component side of the main circuit board Remove the bottom cover for access to the solder side of the main circuit board When replacing the covers replace all screws snugly be careful not to str...

Page 41: ...in order without skipping steps Equipment required Oscilloscope DC coupled with at least 5MHz vertical bandwidth Digital voltmeter Accurate to 0 1 Audio voltmeter Accurate to 2 Sound Technology 1 71 O...

Page 42: ...is on GROUND Test point TP19 power supply common on g Replace the jumper connecting the ground and terminals h Power the unit i Verify that the negative unregulated power rail is between 18V and 26V a...

Page 43: ...NPUT ATTEN control through its range Verify smooth and quiet operation of the control i Turn the L INPUT ATTEN control fully clockwise j Remove the ground from the LEFT IN LO terminal k Connect the au...

Page 44: ...llator and verify that there is no popcorn noise or oscil lation n Check the right channel VCA stage by repeating the above for the right channel Use the right channel controls terminals and trimmers...

Page 45: ...tion meters a Connect the audio oscillator to the LEFT IN HI terminal and ground the left IN LO terminal Set the oscillator s frequency to 1kHz and its output level to OdBu b Set the controls as follo...

Page 46: ...in reduction meter indicates 22 to 25dB gain reduction in 2 seconds 1 second then mute the oscillator t Set the L LEVEL button to OFF and the L COMPR button to ON u Restore the signal and verify that...

Page 47: ...L HF limiter DIST null trimmer R182 for minimum THD Verify that THD does not exceed 0 06 in a 20 20 000Hz bandwidth at TP8 Set the oscillator s frequency to 1kHz and verify that the L HF LIMIT indica...

Page 48: ...the spectrum analyzer s input to TP8 j Verify a flat response 0 25dB for each position of the L PRE EMPHASIS switch k Set the L PRE EMPHASIS switch to 25ns l Slowly increase the tracking generator s o...

Page 49: ...ls with a 60012 resistor A 62Qn 2 watt resistor will do g Connect the audio voltmeter across the LEFT OUT HI and LEFT out LO terminals h Connect the oscilloscope to the LEFT OUT terminals i Advance th...

Page 50: ...o lOdBu h Adjust the L INPUT ATTEN to produce a 18 0dBu 0 5dB level at the LEFT out Hi terminal i Connect the THD analyzer to the LEFT OUT Hi terminal j Verify that the THD is below 0 06 in a 20 20 00...

Page 51: ...page contents 5 2 Problems and Possible Causes 5 3 Technical Support 5 4 Factory Service 5 4 Shipping instructions...

Page 52: ...are frequency compensated by C4 C5 at their outputs to prevent high frequency oscillations If C4 or C5 is ever replaced be sure to use a low inductance aluminum electrolytic A tantalum can fail becaus...

Page 53: ...elow 5 5VDC see step 5 on page 2 10 Such a clipping bias will introduce slight audible distortion on some program material Measure die clipping bias at test points TP2 and TP3 with jumper A in the OPE...

Page 54: ...lable If it is not use a sturdy double wall carton no smaller than 22 x 12 x 5 56cm x 30cm x 13cm with a minimum bursting test rating of 200 pounds Place the chassis in a plastic bag or wrap it in pla...

Page 55: ...13 6 20 6 26 Specifications Circuit Description 1 Overview 2 Input Buffer 3 Voltage controlled Amplifiers 4 Leveler Compressor Control 5 High frequency Limiter 6 Peak Output Level Meter 7 Power Supply...

Page 56: ...um load impedance is 600 ohms Output can be unbalanced by grounding one output terminal Level Front panel controls permit use with 10dBm to 8dBm systems Output clipping level is 20dBm 600n Connectors...

Page 57: ...pre emphasized output An defeatable peak clipper can enforce an absolute peak ceiling on the pre emphasized output of the HF limiter Response The high frequency limiting threshold and attack time hav...

Page 58: ...a proprietary class A voltage controlled amplifier VCA It operates as a two quadrant analog divider with gain inversely proportional to a current injected into a first gain control port and is cascade...

Page 59: ...frequency dependent falling at 6dB octave beyond the break frequency determined by the setting of the HF LIMIT PRE EMPHASIS switch The peak detecting PEAK OUTPUT LEVEL meter is an LED bargraph that m...

Page 60: ...e two matched blocks is used as the feedback element for a separate opamp and the second is driven by the pre distorted output of that opamp The gain of the VCA is therefore inversely proportional to...

Page 61: ...ies the current flowing in R9 by the exponential of the voltage on the base of IC5 pin 9 The current gain of the multiplier and thus the output current of the exponential converter increases as the vo...

Page 62: ...nstant rate from 25 to lOdB gain reduction and then progressively slows as the gain reduction approaches OdB A gating detector monitors the level of the Co Operator s input signal and activates the ga...

Page 63: ...across C106 applied to IC115b s input at pin 6 can never go positive In gated conditions Q103 is pinched off by pulling its gate to a high negative voltage through CR102 This opens the release time pa...

Page 64: ...set to DEFEAT absolute peak control is effected by controlled clipping in the leveler compressor s VCA If the subsequent de emphasis has been jumpered out the absolute peak ceiling at the Co Operator...

Page 65: ...ED DS102 Q106 serves as a zener diode to ensure that DS102 is off when IClOl s pin 7 is close to ground The output of the high frequency limiter is applied to clipper R191 CR113 CR114 The subsequent d...

Page 66: ...ers The nominal unregulated voltage is 22 volts DC at rated line voltage This will vary widely with line voltage variations Regulator dropout will occur if the unregulated voltage falls below about 17...

Page 67: ...n part numbers 20001 xxx Manu factured by R Ohm R 25 Piher Beyschlag Dale Phillips Spectral Matsushita Carbon composition resistors have molded phenolic bodies and are identified by four color bands T...

Page 68: ...luF 21123 410 SPR 1C25 Z5U104M050B KEM C116 Mica 500V l 2pF l 2pF lOpF 21017 010 CD CD15 CD100D03 SAN C117 Tantalum 35V 10 luF 21307 510 SPR 196D 105X9035HA1 MANY C118 Met Polyester 100V 10 0 047uF 21...

Page 69: ...24203 202 MOT MC1458CP1 TI RCA IC102 103 Linear Dual Opanp 24211 202 MOT M034082P TI IC104 Linear Single Opamp 24014 202 SIG NE5534N IC105 Linear Dual Opamp 24208 302 RCA CA3280A TI IC106 Linear Sing...

Page 70: ...witch Rotary Min 2P6T 26204 000 ELSW 73 9123 S201 205 Part of S2 S3xx Subtract 200 and refer to Slxx series Transistors Q101 Transistor Signal PNP 23002 101 MOT 2N4402 FSC Q103 Transistor JFET N 23405...

Page 71: ...ray 9 Yel 1 Red LED Array 6 Grn 3 Yel 1 Red Subtract 200 and refer to DSlxx ser ies 25106 002 25106 001 25152 000 25151 000 HP HP CRB ORB HI IP 1503 HI IP 1400 Resistors R105 Pot Single 5K 5020 20752...

Page 72: ...hes SI S101 105 Switch 6 Sta Push Push DPDT Part of SI 21112 210 CRL DO 102 21112 210 CRL DD 102 29502 000 MIL 4662 28004 125 LFE 313 25C 28101 000 BEL 17534 55007 000 CRB 40061 000 ORB MUR MUR BUS m...

Page 73: ...es Santa Clara CA 95050 St Louis MO 63178 HO 306 E Alondra Gardenia CA 90247 SAN Sangamo Weston Inc Comell Dubilier Elec Penacook NH 03303 Capacitor Division 1700 Rte 23 North Hewlett Packard Co MOT M...

Page 74: ...Assembly Drawing These drawings reflect the actual construction of your unit as accurately as possible Differ ences between the drawings and your unit are almost undoubtedly due to product improve men...

Page 75: ...SOFT IN LEVELING PEAK OUTPUT LEVEL METER LEFT CHANNEL ONLY RIGHT CHANNEL IDENTICAL BLOCH...

Page 76: ...ALI06 imOOATE P M 1 OF I O S OATPOP OF PIOP 6 Pots SIDE OF 6APAOI T e 6 tf EMITTED OF Ti2ANi6toTO 6 I FLIGHT CMAMMfci tEF D blO MATOito SOC T4EU 400 6EEIEA LEFT CHAWAtU fZ EF DEE IOiNlAToR i OCJ POUJB...

Page 77: ...TECHNICAL DATA 6 23...

Page 78: ...2 001206 chanNe l H NNJeu e COMMON PEVI6E HIGHEST E6F PE HOT USED WIDEST EF ces Mot USED hiamest KEF PES MOT useo P E 101 E224 159 140 145 E801 I2 429 359 340 545 e t 5 c 0I01 C131 C 2 01 6581 61 20 C...

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Page 80: ...high frequency IC integrated circuit IM intermodulation or intermodulation distortion JFET junction field effect transistor LED light emitting diode LF low frequency N D noise and distortion PA publi...

Page 81: ...l Serial Dale of comments Would you like a reply Although we will not use your name for advertising or promotion Orban reserves the right to use or distribute any information you supply in any way we...

Page 82: ...e rear panel You may discard the plates and the hardware that attached them 3 Install the four supplied connectors in the pre punched holes attaching them with the supplied screws and nuts See Fig 1 O...

Page 83: ...COLOR J3 1 rh J3 G GN0 BLK J3 2 U 1tbi 61N U J3 3 Hl TBI 5lN Hl XLR CONNECTOR LINE OUT FROM TO COLOR 1 J4 I i h J4 G gnd BLK J4 E L0 TBI II outClo J IsnSCMIBBSEB JIilE XLR CONNECTOR LINE IN FROM I TO...

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