M529 — Communication Modules

M529 COMMUNICATIONS DESCRIPT ION '.. ; ' .4 7) DESIGNATION 16) TALKBACK Selectors SW8 through to SW1s feed the preamplifier output to the auxiliary master outputs, monitors two to four and to a spare output _ The designation strip labels the talkback selectors 8 ) MUTE [NDICATOR DSI iluminates anytime the speaker amplifier mute relay K1 is activated This may occur with the operation of mute swi tch Sw16 or by external mute control functions_ 17) PFLITB LEVEL (^| 3 . R32 is the level control for the speaker amplifier. It controls the Ievel to the output amplifier and therefore the feed to the headset and the external loudspeaker ^ ' ( 9 ) MODULE MUTE SELECT When Sw16 is depressed the speaker output feed from the module will be muted by the operation of K1 _ 10) OSC ILLATOR FREQUENCY " Selector SW1 on the SA14-124 Oscillator Subassembly sets the oscillator frequency . 7. '> - ' , ' ` 11 ) Dhis_hates, {zTethe hole module front panel gives access to the oscill- ator output level trim control R42 on the SA14-124 Oscillator Subassembly ^ .` 12) MONO SLATE ASSIGN .. 6' . '. Selectors SWL and SW6 assign the slate aud io and control 6" signals to the mono outputs of the M527 Master Modu les L 3 3 en .. ^ .3 ~' . . _ ` ; ^ . ; ' ` . . 4 " : . ' ( . , . . . . ' , t.. o^ . . . 4. ' . . . ' . 13) STEREO SLATE ASSIGN .; .n^ Selectors SWS and SW7 assign the slate audio and control signals to the stereo outputs of the M527 Master Modules _ 14) SLATE TONE SW2 when depressed feeds the oscillator output to the slate assign switches. . .. . 15) SLATE SW3 when depressed feeds the microphone preamplifier output to the slate assign switches. Depressing this swi tch overrides slate tone switch Sw2 3-2 3-3

WAAD-BECK sybtems LTD 3. :'.~+ "^ CIRcUIT DESCRIPT ION M529 COMMUNICATIONS MODULE Speaker Amplifier Inputs The actively balanced preamplifier u3 has four inputs which may be connected to it. Two switched inputs appearing at P2 pins 4 and D and 5 and E These inputs are controlled by solid state switches u2 The crosspoints are normally off and may be selected by grounding control inputs P2 pins 7 and H_ A direct input which is not switchable appears at P2 pins 3 and C_ These three inputs have a nominal input signal level of +8 dBm and provide a bridging load to the source A summing input is provided as well at P2 pins 1 and A This input is designed to accept the prefade Iisten bus feeds from the M520 and M521 Input Modules _ 3 ` The preamplifier output is coupled through C14 to the interstage level control R32 Speaker Amplifier Output : . Integrated circuit u4 is the output amplifier. This device is capable of developing a maximum output signal level of three watts into an 8 ohm load_ The input to this amplifier interstage level control R32 _ is coupled through C15 from the . . " | An acti vely balanced headset feed is coupled through C24 and C25 9 appearing at P2 pins 10 and L The nominal output level is +8 dBm. . The 8 o unbalanced ohm speaker feed is coupled through C23 and the normally closed contacts of mute relay K1 This output appears at P2 pin 12 . . `" '^ 6 '~ Relay Control ' . Mute R0 F . ^ . . The mute relay K1 is driven 01 .' by transistors and 02 The LED DSI Mllum ina tes anytime the relay is operated_ Driver transistor 02 receives its control input directly from the integ- ral mute switch SW16 2 03 or through . : ". '. . . . The external mute control input appearing at P2 pin 8 will turn on relay K1 when grounded to control common This input will still mute the relay even through three diode drops (approximately 2 volts) The external mute control input may be inhibited by connecting P2 pin J to control common It should be noted that the operation of the integral mute switch SW16 overrides the external control circuitry. 4-1

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M529 COMMUNICATIONS MODULE M529 COMMUNICATIONS MODULE Talkback Preampl ifier 4;. P~vy Vo .. Talkback Selectors The integral gooseneck microphone connects to the input transformer T1 of the preamplifier circuitry_ The secondary of T1 is coupled through C28 to the preamplifier integrated ciruit USA . The gain of this preamplifier circuit may be varied over a 30 dB range via the setting of R67 . This trim control is accessable from the front panel of the module .` ; The talkback amplifier output is also fed to selectors SW8 through SW15_ These pushbuttons allow the operator to talk to the four auxiliary outputs, monitors two, three and four and to a spare output. A diode isolated control output is provided to operate the external talkback relays or feed information into the ST series console control system. The preamplifier output is coupled through C35 to the limiter circuit. . .. Talkback Limiter Slate The output from the talkback amplifier and the SA14-124 Oscillator Subassembly are fed to the Slate and Tone selectors SW2 and Sw3 _ FET 04 , is used as variable resistor in the limiter circui try, which controls or maintains a constant output Tevel from the preamplifier over a wide range of input level variations The talk control will override the tone selection Selectors SW4 through to SW7 are assign preset selectors which determine to which master outputs the slating is fed to. These selectors have diode isolated control outputs for the purpose of opera ting the external slating relays. (These relays are part of the M527 Master Module) Oscillator USB is a buffering amplifier which isolates 04 from the output circuitry. u6 amplifies the audio output signal which is fed back to rectifiers CR6 and CR7 The error voltage developed across C37 varies the resistance of 04 and therefore the signal level fed to the input of USB Threshold control R84 sets the level at which the 1 imiting begins The correction voltage across C37 is fed to amplifier U7 through R83 The output of u7 drives the 1 imiter level indicator comparato

M529 COMMUNICAT IONS MODULE M529COMMUNICATIONS MODULE Talkback_Preamplifier Talkback Sel ectors ^ny t'. The integral gooseneck microphone connects t0 the input transformer T1 of the preamplifier circuitry The secondary of T1 is coupled through C28 to the preamplifier integrated ciruit USA . The gain of this preamplifier circuit may be varied over 30 dB range Via the setting of R6z This trim control is accessable from the front panel of the module _ The talkback amplifier output is also fed to selectors Sw8 through SW1S_ These pushbuttons allow the operator to talk to the four auxiliary outputs, monitors two, three and four and to spare output.

diode isolated control output is provided to operate the external talkback relays or feed information into the ST series console control system. The preamplifier output is coupled through C35 to the limiter circuit. Talkback Limi ter Slate FET 04, is used as variable resistor in the imiter circuitry, which controls or maintains constant output Tevel from the preamplifier over wide range of input Ievel variations The output from the talkback amplifier and the SA14-124 Oscillator Subassembly are fed to the Slate and Tone selectors SW2 and Sw3_ The talk control wili override the tone selection_ Selectors SW4 through to SW7 are assign preset selectors which determine to which master outputs the slating is fed to.

These selectors have diode isolated control outputs for the purpose of operating the external slating relays (These relays are part of the M527 Master Module) USB is buffering amplifier which isolates 04 from the output circuitry _ u6 amplifies the audio output signal which is fed back to rectifiers CR6 and CR7 The error voltage developed across C37 varies the resistance of Q4 and therefore the signal level fed t0 the input of USB Threshold control R84 sets the level at which the imiting begins The correction voltage across C37 is fed to amplifier u7 through R83 The output of u7 drives the limiter level indicator comparator UBA and U8B R88 sets the threshold point at which the comparators will switch.

The green LED of DS2 is set to iuminate at the threshold of limiting_ : ' . The red LED of DS2 will illuminate (and the green extinguishes) when the degree of limiting reaches 25 to 30 dB, indicating an over - load condition This wi occur if the preamplifier sensitivity control R67 is set too high. ' . - 0 .

. Talkback :' Output Oscillator The SA14-124 Oscillator Subassembly feeds the slating functions and the external assignable output. Selector SW1 assigns the oscillator output to the external feeds through the appropriate loss networks Three different output levels are made available from the module +8 dBm 600 ohms, dBm 600 ohms and -60 dBm 150 ohms _ Two red LED indicators DS3 and DSL illuminate on the M529 Communi- cations Module anytime the oscillator output is assigned or selected to leave the module.

2 The output from the limiter is coupled through C5o to the output power amplifier u9_ U9B forms the lower half of the actively balanced output amplifier and U9A forms the upper inverting section The actively balanced output is coupled through C59 and C60 to P1 pins 55 and 56 of the module connector This is the direct output from the talkback amplifier and operates at nominal level of +8 dBm _ .

'. ' ' . . : c: ' : ` . Power Supply Decoupling The unipolar +25 volt supply is applied to P2 pin 21 This supply voltage is fed through fuse F1 and isolation diode CR37 to several decoupling networks ' : 4-2 4-3

M529 COMMUNICATIONS MODULE Refer to Module Layout B529-04-001 s MICROPHONE The integral microphone is the input to the talkback pre- amplifier 2 ) OSCILLATOR IND ICATOR DS3 iluminates when the oscillator output is fed directly from the module. This occurs when SW7 is depressed _ 3 ) OSC ILLATOR SELECT SW7 when depressed sends the oscillator output through loss net- works to the integral jackfield of the ST series of Stereo Television consoles The output levels are +8 dBm 600 ohms, dBm 600 ohms and -60 dBm 150 ohms.

4 ) MIc LEVEL ~ The access hole in the module front panel allows Microphone level control R67 to be optimally adjusted for the correct preamplifier output. . Speaking in normal tone of voice, six to eight inches from the microphone, slowly turn R67 clockwise until the green LED of the PGM/PEAK indicator illuminates as words are spoken . If the sensitivity is set too high then this indicator will switch from green to red indicating excessive imiting and an overload condition _ 5 ) SLATE TONE IND ICATOR ~.

6 . 7^ DS4 iluminates when the oscillator output is fed to the slate assign selectors, SWL through to Sw7 _ 6 ) PGM/PEAK 7<o. The two colour LED indicator DS2 gives an indication of the pre- amplifier limiter operation and therefore the preamplifier output level When it illuminates green the nominal output level from the preamplifier wili be +8 vu and the Iimiter is just beginning to imit the audio level When it flashes red an excess amount of limiting is occuring and overloading of the amplifier begins_ 3-1

M529 COMMUNICATIONS MODULE based ` on voltage .. . Note: Specifications are levels of a 600 ohm system unless otherw ise specified_ : Aeneo . ' . . ^o* clq;20..' 4. . .^s A Preamplifier Section: ! Spav v" 9 Gain: 83 dB to 53 dB +/-1 dB (Transducer Gain) ' : '`. u Frequency Response: +/-0.5 dB from 100 Hz to 5 kHz M greater than 3 dB down at 10 kHz. Noise: -120 dBm EIN at maximum sensitivity . ~(measured over a 20 Hz to 20 kHz band- width) .= ' Harmonic Distortion: Less than 0 .5% THD from 100 Hz to 5 kHz at +18 dBm (Limiter Off) output .') Lc?) ` Source L mpedance: 150 ohms balanced _ . >. . 1 750 : ' ' ` Input mpedance: ohms or greater . :i0 `. .. . Input Levels: -75 dBm to -45 dBm . . ; 4. Output [ mpedance: Less than 50 ohms, balanced . R 4: ._. ' 2 Load Impedance: ' 600 ohms or grea ter, balanced +8 +22 dBm . Output Level : dBm nominal , maximum. '' .: ; .` P` ' '~^ So< v" 4 . . Limi ter: Range: 30 dB Slope: Nominally 3:1 for the first 10 dB of Iimi ting, increasing to 6:1 or better at 30 dB _ Threshold: Set at 5 dB above the nominal operating level , resulting in a constant output of +8 .s 4t~ dBm under dynamic conditions_ ' " Attack Time : 10 milliseconds nominal Release Time: 3 seconds nominal Uni .` 4' .. * ` . 1-1

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M529 COMMUNICAT IONS MODULE M529 COMMUNICATIONS MQDULE B Speaker Amplifier Section: . . .

C Oscillator Section: 821 ^ :. Frequencies: 30,50,70,100,4O0, 1K,4K,6K,10K and 15K Hertz +/-10% ' ' Amplitude Stability: +/-0.25 dB, after a 30 minute warm up Gain: To Speaker Output: +37 dB +/-1 dB. To Line Output: +14 dB +/-1 dB _ (measured through an externai 30k ohm summing network) Frequency Response: +/-1 dB from 100 Hz to 5 kHz . Waveform: Sinewave, less than 0.15% THD at all frequencies. Noise: Better than 72 dB below 3 watts or +18 dBm and 10 dB inhand in the level control (measured over a 20 Hz to 20 kHz band- width) Output Impedance Less than 50 ohms, actively balanced. Load Impedance: 600 ohms balanced. Harmonic Distortion: Less than 0 .5% 100 Hz to 5 kHz at 3 watts or +18 dBm output _ Output Level +8 dBm nom inal Source Impedances Line Inputs: 600 ohms or less balanced ing current ~3k < source balanced Sopui 'mpedances: ohm Line Inputs: 30k ohms balanced _ Summing Input: Less than 10 ohms balanced D Power Requirements: +25 volts dc 120 mA nominal 450 mA maximum at 3 watts /^ Ambient Temperature: 0 to 60 degrees Celsius | Dimensions;: 1.60" wide X 14.15" high X 6.50" deep _ (41mm X 360 mm X 165 mm ) Weight: 6.< j 2 Ibs 6 oz (1.14 kg) net_ .. . s n . '. ' ' ' . . 4. . :. `. ` . , <' ` . ' . . .s . " "` .. Input Levels: Line Inputs: :. Summing Input: 4 > +8 dBm nominal +24 dBm maximum. 0 dBm nominal (through a 30k ohm current source) +20 dBm maximum. Output 1 mpedances: Speaker: Line: Less than 0.5 ohms unbalanced Less than 50 ohms balanced Load Impedances: Speaker: ' . Line . 8 ohms nominal 600 ohms, balanced . Output Levels: Speaker: 200 mW nominal; (+34.77 dB ) 3 watts maximum Line: +8 dBm nominal +22 dBm maximum. 1-2 1-3

WAAD-BECK systems LTD GENERAL M529 COMMUNICATIONS_MODULE . .. . The M529 Communications Module provides the required talkback, cue feed and test oscillator facilities for the ST series of Stereo Television consoles The integral three watt cue amplifier receives inputs from the console prefade Iisten bus and external talkback facilities such as an external intercom system Two of the external inputs are selected via solid state switches while a third is a direct input The cue amplifier output consists of an actively balanced +8 dBm headset feed and an unbalanced 8 ohm speaker connection A mute relay is prov ided for the speaker feed The muting of the speaker may be achieved directly on the module or by external control circuitry . / (? . The talkback amplifier amplifies the microphone signal to a standard +8 dBm Iine level An integral limiter maintains a relatively constant output signal level over wide ranges of input level vari- ations_ A Normal and Overload LED indicator is provided to show when the input microphone sensiti vity adjustment is correctly set The talkback amplifier provides a direct output, assignable slate and select functions , 4. ' (i A slate feed is assignable through master channel preselectors_ Talk- back to the console auxiliary outputs, mon itors two, three and four, as well as a spare output are available through individual mom- entary pushbutton selectors. A ten selection multifrequency oscillator is part of the M529 module. The oscillator connects to the master slating control circuitry and to switchable direct output feeds _ The oscillator output selector has a red LED indicator which illuminates when a tone signal is leaving the module These outputs are normally wired to the ST console integral jackfield . ' ^ . s , ` The M529 is packaged in the standard WBS module size of 1.60" wide X 14.15" high X 6.50" deep _ The power for the module is a unipolar +25 volts which is taken from one side of the console bipolar power supplies_ P7 i . . <.: 2-1

WARD-BECK SysTems LTD. e ; ` OPERAT IONAL DESCR PTION M529 COMMUNICATIONS MODULE Refer to Module Layout B529-04-001 s 1 ) MICROPHONE . ' n . The integral amplifier microphone is the input to the talkback pre- a & 7107 : . . . / : ~. { OSC ILLATOR IND ICATOR . . s < 3 , :^ . 3 . :... DS3 Mlluminates when the oscillator output is fed directly from the module. This occurs when SW7 is depressed . . - 2) OSCILLATOR SELECT 3 ) . e 2 4. .` 30 '' . . " . SW7 when depressed sends the oscillator output through loss net- works to the integral jackfield of the ST series of Stereo Television consoles The ou tput levels are +8 dBm 600 ohms, 0 dBm 600 ohms and -60 dBm 150 ohms. . ` ca. . = 4) MIC LEVEL 8 . The access hole in the module front panel allows Microphone level control R67 to be optimally adjusted for the correct ~ preamplifier

M529COMMUNICAT IONS MODULE M529_COMMUNICATIONS_MODULE Speaker Amplifier Section: C. Oscillator Section

Gain: To Speaker Output: +37 dB +/-1 dB To Line Output: +14 dB +/-1 dB _ (measured through an external 30K ohm summing network) Frequency Response: +/-1 dB from 100 Hz to kHz Frequencies: 30 , 50 , 70, 100,400,1K,4K,6K,1OK and 15K Hertz +/-10% . Amplitude Stability: +/-0.25 dB, after 30 minute warm up Waveform Sinewave, less than 0.15% THD at all frequencies Noise= Better than 72 dB below watts or +18 dBm and 10 dB inhand in the level control (measured over 20 Hz to 20 kHz band- width) _ Output Impedance Less than 50 ohms, actively balanced _ Load Impedance: 600 ohms balanced . Harmonic Distortion Less than 0.5% 100 Hz to +18 dBm output. kHz at watts or Output Level +8 dBm nominal Source Impedances Line Inputs: Summing Input: D Power Requirements: +25 volts dc 120 mA nominal 450 mA maximum at watts_ 600 ohms or less balanced 30k ohm current source balanced _ Ambient Temperature: t0 60 degrees Celsius ' : ` Input Impedances: Line Inputs: Summ ing Input 30k ohms balanced _ Less than 10 ohms balanced Dimensions: 1.60" wide 14.15" high 6.50" deep_ (41mm 360 mm 165 mm ) Input Levels: Line Inputs: Summing Input: ~. ' Weight: s Ibs oz (1.14 kg) net . . +8 dBm nominal +24 dBm max imum. dBm nominal (through 30k ohm current source) +20 dBm maximum

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Output Impedances: Speaker: Line ! . Less than 0.5 ohms unbalanced. Less than 50 ohms balanced_ Load 'rpedkeces = ohms nominal _ Line 600 ohms, balanced _ Output Levels: Speaker : 200 mw nominal (+34.77 dB) 1 .` ` , 1-3 watts maximum Line: +8 dBm nominal , +22 dBm maximum. 1-2

M529 COMMUNICATIONS MODULE Note: Specifications are based on voltage levels of 600 ohm system unless otherwise specified_ A Preamplifier Section: Gain: 83 dB to 53 dB +/-1 dB (Transducer Gain) '.u Frequency Response: +/-0.5 dB from 100 Hz to 5 kHz '{a grea ter than dB down at 10 kHz_ Noise: -120 dBm EIN at maximum sensitivity (measured over 20 Hz to 20 kHz band- width) Harmonic Distortion: Less than 0 .5% THD from 100 Hz to kHz at +18 dBm output (Limiter Off) 150 ohms balanced 750 .

ohms or greater _ 2.. . -75 dBm to _45 dBm . : . Less than 50 balanced ohms, " 600 ohms or grea ter, balanced _ Source mpedance: Input Impedance: Input Levels: Output Impedance: Load Impedance: Output Level +8 dBm nominal _ +22 dBm maximum. S: Xn0 Limiter : Range Slope: 30 dB _ Nominally 3:1 for the first 10 dB of imiting, increasing to 6:1 or better at 30 dB.

Set at dB above the nominal operating level resulting in constant output of +8 dBm under dynamic conditions 10 nominal milliseconds seconds nominal Threshold: Attack Time : Release Time ' ' . 3

M529_COMMUNICATIONS MODULE M529 COMMUNICATIONS_MODULE R15g C66 and C67 decouple the supply voltage to u3 _ R158 and C65 decouple the supply voltage to u9 _ PART DESCR{PTION MFG MFG PART NUMBER Decoup lers 08 and Q9 drop and additionally filter the supply voltage to the appropriate level for the operation of the speaker amplifier, solid state switches and the input circuitry of the preamplifier _ The common return is at P2 pin 20 and the frame chassis connection is at P2 pin 22 _ C1 Capaci tor C2 > . I C3 ` . <' C4 C5 uF/35 V uF/35 V uF/35 V uF/35 V 0 1 uF/35 V Kemet T390B105MO3SAS T390A 104M035AS C6 C7 C8 . c9 C10 . 0.1 uF/35 V uF/35 V uF/35 V 0_ uF/35 V 0_ uF/35 V ~ ' . T390B105MO3SAS . T390A 104M035AS C11 C12 C13 C14 C15 . 22 uF/25 V 22 uF/25 V 10 uF/25 V 10 uF/25 V . 10 uF/25 V Philips 03016229

Kemet T39OC106MO25AS C16 ~X' C17 C18 ' '. C19 C20 ' ; 0.01 uF/100 V 150 pF 0.015 uF/100 V 150 pF 2.2 uF/35 V Aselco Philips ' Aselco Philips ` Kemet ` cQ92-MC-100-103M 2222-638-70151 cQ92-MC-100-153M 2222-638-70151 T390C225M035AS C21 C22 C23 C24 C25 X. . 100 uF/25 V 0.068 uF/100 V 680 uF/16 V 100 uF/25 V 100 uF/25 V Philips Aselco , Philips X ". 03116101 cQ92-MC-100-683M 03215681 03116101 4' ~Vo: 3 : ' . 4' ' . ~ . . . .s . ";:. :. ` . . . . ~.. C26 C27 C28 C29 C30 uF/35 V 220 pF uF/35 V 10 uF/25 V 68 pF Kemet T390B10SMO3SAS 2222-630-03221 T390B105MO3SAS T390C106MO25AS 2222-638-52689

':^ Philips C31 ~ - C32 ^ .. C33 ' C34 . C35 . , 22 pF 1 uF/35 V 33 uF/10 V 22 pF uF/35 V 2222-638-10229 T390B105MO35AS T390D336M01OAS 2222-638-10229 T390B105MO3SAS Kemet ' , Philips Kemet 4-4 5-1

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SA14-124 OSC ILLATOR ASSEMBLY PART DESCRIPT ION MFG MFG PART NUMBER C1 C2 C3 CL C5 Capacitor 0.025 uF/100 Aselco cQ92-MC-100-253J 0.025 uF/100 47 pF Philips 2222-638-34479 C6 c8 C9 C1o 33 uF/16 uF/100 0. uF/100 2 .2 uF/35 10 uF/25 Kemet Sprague Sprague Kemet T390D336MO16AS 1CIOX7RTO4MOSOB 1CIOXZR1O4MOSOB T390C225M035AS T390C1O6MO25AS C11 C12 C13 C14 C15 10 uF/25 22 uF/25 V { ` Philips 03016229 delete Capacitor T390C106MO25AS 10 uF/25 10 uF/ 25 Kemet C16 C17 C18 C19 C20 33 uF/16 22 uF/25 47 PF 22 pF 47 pF T390D336M016AS 03016229 2222-638-34479 2222-638-10229 2222-638-34479 Philips C21 C22 C23 C24 C25 22 pF 680 uF/16 680 uF/16 100 uF/25 uF/35 2222-638-10229 03215681 03116101 T390B1O5MO3SAS Kemet CRI CR2 Diode Fairchild 1N4148 P1 Connector, Pin Bergstik 65646-106 Q1 Transistor .. Resistor 1/4W % 619K 221K 121K 82K5 16K2 National P1086 ^ s . .. . . R1 R2 R3 R4 R5 Philips

2-1 Berg

PARTS LiST M529 COMMUNICATIONS MODULE M529 COMMUNICATIONS MODULE PART DESCR IPTION MFG MFG PART NUMBER PART