User Manual - IRT Communications
Contents
1. T Electronics Pty Ltd 35 000 832 575 26 Hotham Parade ARTARMON N S W 2064 AUSTRALIA National Phone 02 9439 3744 Fax 02 9439 7439 International 461 2 9439 3744 61 2 9439 7439 Email sales irtelectronics com IRT Eurocard Type AA 704 amp AA 704T Audio Distribution Amplifier Designed and manufactured in Australia 0704 aa ibw doc page 1 of 23 25 05 98 0704 aa ibw doc IRT Eurocard Type AA 704 amp AA 704T Audio Distribution Amplifier Instruction Book Table of Contents Section General description Technical specifications Technical description Internal adjustments Configuration Installation Operational safety Pre installation Installation amp connection RCA phono rear assemblies RB704 amp RB 367 Front and rear location diagrams Sub modules CAA 3131 Remote gain control AG 604SW Switched frequency oscillator AG 604ST Stereo oscillator AS 604 Remote mode control Drawing list index This instruction book applies to units later than S N 9404000 page 2 of 23 25 05 98 IRT Eurocard Type AA 704 amp 704 Audio Distribution Amplifier GENERAL DESCRIPTION The IRT AA 704 is a high performance Audio Distribution Amplifier which is manufactured on extended Eurocard boards A total of 12 cards and a PT 700 Dual 28 Vac power module can be accommodated in an IRT FR 700 3 Rack Unit Frame Other mounting options are available including the FR 722 1 Rack Unit Chassis PSU conversion an2. 24 dBm 20 Hz to 20 KHz 75 dB 20 Hz to 20 KHz 80 dB 20 Hz to 20 KHz 28 Vac CT 14 0 14 or 16V DC 55 mA no signal to 170 mA 20 dBu all outputs loaded in 600 Plugable screw block connectors RB 733 Krone IDC RB 733T RCA phono RB 704 or RB 367 0 50 C ambient Suitable for mounting in IRT 19 rack chassis types FR 700 amp FR 722 with input output and power connections on the rear panel Grey enamel silk screened black lettering amp red IRT logo Detachable silk screened PCB with direct mount connectors to Eurocard and external signals 6 HP x 3 Ux 220 mm Eurocard RB 733 Rear connector assembly with plugable compression screw terminals Matching connectors for audio inputs amp outputs supplied RB 733T Rear connector assembly with Krone IDC terminals RB 704 Rear connector assembly with 10 x RCA phono connectors RB 367 Rear connector assembly with 26 x RCA phono connectors TME 6 module extender card page 5 of 23 25 05 98 TECHNICAL DESCRIPTION The block diagram ref 802827 shows that the AA 704 comprises a Two separate input stages Left and Right Each input stage converts its balanced high impedance input to an unbalanced low impedance output The gain of these stages can be varied by 12 dB in two 6 dB steps by changing the stage gain links b Asingle optional plug in area Should a plug in option be installed Links 1 and 2 should be cut c Two front panel adjust
3. mode as below LK 7 amp LK 8 are inoperative AS 604 Set to stereo mode as below 2 Stereo mono Stereo LK 3 amp LK 6 installed LK 4 not installed Mono L Input LK 3 LK 4 amp LK 5 installed LK 6 not installed LK 8 sets maximum gain Gain adjust is only by RV 3 L gain LK 7 and RV 4 are inoperative Mono R Input LK 3 LK 5 amp LK 6 installed LK 4 not installed LK 7 sets maximum gain Gain adjust is only by RV 4 R gain LK 8 and RV 3 are inoperative 3 Maximum gain Left channel LK 8 set as designated on PCB overlay for 6 12 or 18 dB max Right channel LK 7 set as designated on PCB overlay for 6 12 or 18 dB max L L F K K R 3 4 PCB 802736 N Gain Relative Position of User Settings T LK6 Not to scale Rear Sub module area 0704 aa ibw doc page 8 of 23 25 05 98 INSTALLATION Operational Safety WARNING Operation of electronic equipment involves the use of voltages and currents which may be dangerous to human life Maintenance personnel should observe all safety regulations Do not change components or make adjustments inside the equipment with power ON unless proper precautions are observed Note that under certain conditions dangerous potentials may exist in some circuits even though power controls are in the OFF position Pre Installation Handling The modules used in this equipment contain static sensitive devices and proper static free handling precautions sh
4. module specifications 0 50 C ambient 65 mm x 48 mm Matching connector for control input type 1300 103 426 Instruction manual 25 05 98 CIRCUIT DESCRIPTION The circuit comprises of a low distortion Wein bridge oscillator with a remote control facility to select the operating frequency The normal input circuitry of the distribution amplifier is not used Control of frequency is by way of grounding contacts which activate relays on the sub board to select the correct time constants in the circuit These are arranged so that four commonly used frequencies may be obtained using only two control relays operated over a three wire circuit The output from the oscillator is fed to the left output gain control on the main circuit board which provides a single level control for all outputs The circuit does not contain a latch for the remote input and the external contact must therefore be maintained for as long as the selected frequency is required In the absence of any remote input both relays will turn off and the oscillator will default to 1 KHz CONFIGURATION The main module must first be configured to accept the sub module This is achieved by various link settings as outlined in the main module manual The main module is normally delivered set for stereo operation and no sub modules fitted Before installing the AG 604SW set the main module to L mono mode as detailed in main module instruction manual LK 7 amp LK 8 ar
5. on the RB 704 is made between the input and input then a slight improvement in noise performance may be achieved by fitting a Ohm resistor between the input and Gnd on the connector The RB 367 is factory fitted with these resistor s R 1 amp R 2 located next to input connectors and these may be removed if balanced input operation is required RB 367 only The RB 367 may only be fitted to IRT 1 RU Eurocard frames such as the FR 722A The frame can only accommodate one AA 704 with the RB 367 as the RB 367 covers the entire rear of the frame The AA 704 module must be mounted on the right hand side of the frame next to the power switch and a blank front panel should be secured in the unused position on the left hand side Audio Connections For mono operation it is usual to connect the input audio cable to the Left input pins For stereo connect the Left input cable to the Left input and the Right input audio cable to the Right input If input termination is required on the RB 733 then termination resistors should be fitted to the input sockets The RB 733T is fitted with 620 termination resistors as standard with a link provided in series with the termination which should be removed if loop through or high input impedance operation is required The 620 resistrors in parallel with the normal high input impedance provide an actual input impedance of 600 Connect as many outputs as required Remember for stereo operation
6. signal interrupted every second on the right channel This configuration conforms to the recommended practice of FACTS Federation of Australian Commercial Television Stations for channel identification TECHNICAL SPECIFICATIONS IRT Eurocard Sub module AG 604ST Performance See main module specifications for other specifications AG 604S T FACTS stereo oscillator module Distortion 0 0196 at 8 dBm Frequency 1 KHz continuous left channel KHz interrupted every second right channel Power requirements t 12 Vdc from main module Power consumption See main module specifications Other Temperature range 0 50 C ambient Dimensions 65 mm x 48 mm Optional accessories Instruction manual CIRCUIT DESCRIPTION The normal input circuitry of the distribution amplifier is not used The circuit comprises of a low distortion Wein bridge oscillator an astable multivibrator and a voltage controlled switch The oscillator output is passively split with one output fed directly to the left output The other output is fed via an FET which is gated on and off by a square wave oscillator to provide an output which is alternatively on and off This if fed to the right output The gating frequency may be trimmed by adjusting potentiometer RV 1 which sets the frequency of the astable multivibrator U 2 The outputs from the oscillator sub board are fed directly to the left and right output gain controls on the main circuit board
7. which provides level control for the left and right outputs respectively 0704 aa ibw doc page 18 of 23 25 05 98 CONFIGURATION The main module must first be configured to accept the sub module This is achieved by various link settings as outlined in the main module manual The main module is normally delivered set for stereo operation and no sub modules fitted Before installing the AG 604ST check that the main module is set to stereo mode as detailed in main module instruction manual Note that LK 7 amp LK 8 are inoperative INSTALLATION Module To install the sub module onto the main module first ensure that the proper mode of operation has been selected on the main module Then remove straps LK 1 and LK 2 on the main module Hold the sub module so that the legends on the sub board and the legends on the main module have the same orientation Place the sub module over the connector pins of the main module The 16 pins fit into 16 holes in the sub module Push the sub board down until it rests on the orange insulation of the pins 0704 aa ibw doc page 19 of 23 25 05 98 IRT Eurocard Sub board Type AS 604 GENERAL DESCRIPTION The AS 604 can remotely switch between mono and stereo modes or reverse the phase of the left channel in stereo mode Links on the board allow a choice of either a 3 dB or 6 dB mono mix Only one mode is possible at any time Normal stereo operation Reverse phase of left channel Switch lef
8. 2510 AdOD 10N 00 i1iH9IHAdOD 90 1 ANANI ugin H O Lan o L H o en 929 oe 1 5 20 O ino H ino L O Os 1 O L 9 O j 1431 SK4 8 20a OPTIONAL POWER Ee pn al em gt J2 1 4 LEFT amp INPUT COPYRIGHT DO NOT COPY NOR DISCLOSE TO ANY THIRD PARTY WITHOUT WRITTEN RB 704 CONSENT REAR ASSEMBLY cuEckEo scave DRAWING Ne 803840 SHEET ENG APP 1 OF 1 PCB BO3541 CONTRACT No IRT Electronics Pty Ltd ARTARMON NSW AUSTRALIA 2064 KK E 951209 dod 9 ILOWIY 401 5 Dy F Qu ILON H 0 4 OT T m 4 Lnd 24naow ns HOLV1112850 O3H24IAS MS YOS OY 81968236 346 ISLAVDHLO SIWA LOOTOS anssi ta IOYVLNOD A 4 Q DND doge 62 92 ALZ Su sew ainpous qane 4032q dogs YO9 YY 244 16 O4 DUL 239 SAUNT AOD Q vzw 22 we
9. 3u NINOS Anen 5 941 SiNd ino 094345 Q3ONVIVe 5 SX L 1 d 9 1 PS 153135 lt M S 444 9914044013 22509 4N3SNOO ANY Ol 3SsO12si0 JHO mi ao oid esu ZEN 1 735 L 56 C Mt l teu YEOSZNZ seu 50 osu i 521 tcu 23 L SEL aun S i SEN L SS L 5i SEN mi _ VEOOZNZ Gou FEN co any oU 7 tom id OPTIONAL POWER IN le 1d al J2 14 4 COPYRIGHT DO NOT COPY NOR DISCLOSE TO ANY THIRD PARTY RB 733 WITHOUT WRITTEN s REAR ASSEMBLY CONSENT DRAWN K N ScALE prawno No SHEET ENG APP 1 1 803539 CONTRACT No IRT Electronica Pty Ltd ARTARMON NSW AUSTRALIA 2064 902 VIWHISNY MSN NOWHUYIlUY 21002328I3 JUI 129YB1NO2 99 08 Y 301 sev 99 08 O3333H3 5 Uv3u INSSNOJ JUIL iEEZz 8H N311IGM LNOHLIM Altivd GUIHi ANY 01 36071
10. 8 dB 9 Front panel left amp right gain adjustment Maximum output level 24 dBu e Excellent electrical characteristics Equipment provided 704 704 Audio Distribution Amplifier module RB 733 Rear Assembly 704 704 Audio Distribution Amplifier module RB 733T Rear Assembly Optional RB 704 Rear Assembly RCA phono 0704 aa ibw doc page 3 of 23 25 05 98 Accessories available FR 700 Eurocard module mounting frame FR 722 1 RU chassis conversion PSU AR 604 Remote gain control AG 604SW Four frequency switched oscillator module AG 604ST FACTS stereo oscillator module AS 604 Remote mono stereo amp phase control 6 Eurocard extender board Instruction Book 0704 aa ibw doc page 4 of 23 Provides mounting for up to 12 AA 704 amplifiers and one PT 700 Dual AC power supply side by side in 134 mm of standard Rack space 3 Rack Units The FR 722 provides a means of converting Eurocards to a 1 rack unit format The FR 722 can be fitted with either one or two Eurocards in a horizontal side by side format A single AC power supply is included to power the cards The AR 604 can be used for the remote gain control or by varying the strapping on the board can provide stereo panning audio over control and cross fading AG 604SW provides a remotely switchable fixed 400 Hz 1 KHz 4 KHz or 10 KHz tone signal The AG 604ST provides a continuous 1 KHz tone signa
11. a 3 dB mix Note that if the links are removed for the 3 dB mix option that operation of 1 on its own to provide phase reversal of the left channel will also result in a 1 5 dB attenuation of the left channel when the phase is reversed CONFIGURATION The main module must first be configured to accept the sub module This is achieved by various link settings as outlined in the main module manual The main module is normally delivered set for stereo operation and no sub modules fitted Before installing the AS 604 check that the main module is set to stereo mode as detailed in main module instruction manual INSTALLATION Module To install the sub module onto the main module first ensure that the proper mode of operation has been selected on both the main and sub modules Then remove straps LK 1 and LK 2 on the main module Hold the sub module so that the legends on the sub board and the legends on the main module have the same orientation Place the sub module over the connector pins of the main module The 16 pins fit into 16 holes in the sub module Push the sub board down until it rests on the orange insulation of the pins 0704 aa ibw doc page 21 of 23 25 05 98 Remote control AS 604 can be remotely switched to provide one of the following modes of operation Only one mode is possible at any time 1 Normal stereo operation 2 Reverse phase of left channel 3 Switch left channel input to mono output 4 Mix
12. able gain controls Links are provided after the gain controls to feed the Left or Right input to both output stages for Mono operation or the Left input to the Left output and the Right input to the Right output for stereo d Two separate output stages Each converts its unbalanced input to 5 resistively isolated balanced outputs e Power Supply See detailed description following Power supply Input power to the module may be fed by a number of means 1 One or two 14 0 14 Vac supplies via connections on the 64 pin DIN rear connector of the module Used when module is mounted in FR 700 chassis or FR 748A chassis fitted with one two PT 701 PSU s 2 Two 16 Vdc supplies via connections on the 64 pin DIN rear connector of the module Used when module is mounted in FR 748A chassis fitted with one or two PT 748A PSU s 3 One 14 0 14 Vac supply and one 16 Vdc supply via connections on the 64 pin DIN rear connector of the module Used when module is mounted in a FR 748A chassis fitted with 1 x PT 701 PSU and 1 x PT 748A PSU 4 single 14 0 14 Vac supply connected to SK 2 on the rear assembly Used when module is mounted in FR 722 chassis The input power is isolated by fusible resistors F 1 to F 4 Should these fail they should be only replaced by a similar type of the same value or protection of the common power supply will be compromised If an AC supply is provided the isolated AC is full wave rectified
13. b board down until it rests on the orange insulation of the pins Remote control To control the gain a remote 100 variable resistor should be wired between the pins marked Remote 1 2 and 3 on the main module rear assembly Connect Pin 1 to the bottom of the potentiometer CCW connection Pin 2 to the slider rotor connection Pin 3 to the top CW connection 0704 aa ibw doc page 14 of 23 25 05 98 IRT Eurocard Sub module Type AG 604SW GENERAL DESCRIPTION The AG 604SW Four frequency switched oscillator sub module converts the supporting main module audio distribution amplifier into a multi output reference oscillator for test or alignment purposes Provision is made to remotely switch the frequency to a fixed 400 Hz 1 KHz 4 KHz or 10 KHz tone TECHNICAL SPECIFICATIONS IRT Eurocard Sub module Type AG 604SW Control input Remote switch component Connections Pin 1 2 3 Performance See main module specifications for other specifications Distortion Frequency Power requirements Power consumption Other Temperature range Dimensions Standard accessories Optional accessories 0704 aa ibw doc page 15 of 23 Single pole 4 position or equivalent Not supplied On rear assembly of main module 3 pin female polarised 1300 103 426 GND Relay 1 control Relay 2 control 0 0146 at 8 dBm Remote selectable to 400 Hz 1 KHz 4 KHz or 10 KHz 12 Vdc from main module See main
14. by diodes D to D4 and D5 to D 8 to provide a raw DC voltage of approximately 20 V at filter capacitors C 15 and C 16 The actual voltage will vary depending on the type of frame loading of PSU by other modules and the local mains supply voltage If a DC supply is provided the isolated DC passes through the diodes D 1 to D4 and D5 to D 8 which provide protection against accidental reverse polarity connection of the DC supply Where a DC supply is used the input voltage must be at least 15 Vdc under all conditions to ensure sufficient margin for the proper operation of the following voltage regulators and losses in the input fusible resistors and diodes The raw DC power is fed to three terminal regulator IC s which provide 12 Vdc rails for the operating circuits The LED on the front panel is wired in series with a zener diode between 12 and 12 Volts The zener is to ensure that the LED extinguishes if either one of the regulators fails Wideband modification For use with timecode composite stereo and other extended frequency response signals Capacitors C 11 amp C 13 in the feedback loops of U 3A amp U 4A respectively provide high frequency rolloff above 20 KHz If a higher frequency response is required the value of C 11 amp C 13 may be decreased from 120 pF to 22 pF This will provide a useful response to 100 KHz 0 5 dB 0704 aa ibw doc page 6 of 23 25 05 98 704 Internal Adjustments The following adjustable resist
15. d special frames for Telecom use The 704 is a special version of the AA 704 for Telecom use and is supplied with rear assembly type RB 733T Except where noted all references to the AA 704 in this instruction book apply equally to the AA 704T The AA 704 can be used for either mono or stereo signals a simple on board jumper change is all that is required to vary the mode of operation Front panel access is provided for the gain adjustment of Mono Left and Right Channels A green power on LED indicates the presence of both the supply rail voltages There are three internally selectable gain ranges 6 dB 12 dB 18 dB The variable gain control provides adjustment from zero output to the maximum of the selected gain range The maximum output of the AA 704 is 24 dBu The amplifier has space to accept plug in sub module options AR 604 Remote Gain and Control module 6045 Four Frequency Switched Oscillator module AG 604ST FACTS stereo oscillator module Left continuous amp right interrupted AS 604 Stereo mono and phase control module Standard features Selectable stereo or mono mode Ten outputs mono or five left and five right in stereo Upto 12 ADA s per frame 9 Dual redundant low voltage AC supplies Input common mode rejection High impedance balanced or unbalanced bridging input Balanced 40 Ohm output source impedance Three internally selected gain ranges 6 dB 12 dB and 1
16. e inoperative 0704 aa ibw doc page 16 of 23 25 05 98 INSTALLATION Module To install the sub module onto the main module first ensure that the proper mode of operation has been selected on both the main and sub modules Then remove straps LK 1 and LK 2 on the main module Hold the sub module so that the legends on the sub board and the legends on the main module have the same orientation Place the sub module over the connector pins of the main module The 16 pins fit into 16 holes in the sub module Push the sub board down until it rests on the orange insulation of the pins Remote control of frequency The frequency of the oscillator may be set using the remote connector on the rear assembly of the main module If no connection is made the oscillator will default to 1 KHz operation As the remote switches and wiring carry the full relay current it is important that the losses in the external wiring be kept to a minimum No damping of the remote selection is provided and some instability of the output signal will result during switching This should be considered when choosing the type of switch and when it will be operated Refer to Drawing 803006 for modes of operation Frequency Connect to Pin 1 GND 2 Default N C 2 amp 3 3 0704 aa ibw doc page 17 of 23 25 05 98 IRT Eurocard Sub board 6045 GENERAL DESCRIPTION The AG 604ST provides a continuous 1 KHz tone signal on the left channel and the same
17. l on the left channel and the same signal interrupted every second on the right channel The AS 604 can be to remotely switch between mono and stereo modes or to reverse the phase of the left channel in stereo mode Links on the board allow a choice of either a 3 dB or 6 dB mono mix 25 05 98 TECHNICAL SPECIFICATIONS IRT Eurocard module type AA 704 Inputs Left Mono and Right Type Impedance AA 704 704 Max input level Input CMR Outputs Type Number RB 704 RB 733 amp RB 733T RB 367 Impedance RB 733 amp RB 733T RB 704 amp RB 367 Max output level DC on output Performance Gain Frequency response Harmonic distortion Noise Crosstalk Left right Amplifier amplifier Power Requirements Power consumption Connectors 704 704 Optional Other Temperature range Mechanical Finish Front panel Rear assembly Dimensions Standard accessories 704 704 Optional accessories 0704 aa ibw doc Tranformerless bridging 10 600 or gt 10 selectable by links on 733 24 dBu 6 dB gain mode gt 55 dB 20 Hz to 20 KHz Transformerless balanced 10 10 mono or 5 left and 5 right 26 26 mono or 13 left and 13 right 400 560 24 dBu into 10 loads each 600 20 mV Internally linked to a maximum gain of 6 12 18 dB 0 0 3 dB for 20 Hz to 20 KHz 0 00596 20 Hz to 20 KHz at 20 dBm 110 dB Ref
18. left and right channels to mono output with selectable 3 dB or 6 dB cut in signal level To configure these options see Drawing 803013 To control the operation mode a switch should be wired between the pins marked Remote 1 2 and 3 on the RB 733 rear assembly Pin connections are 1 common ground Pin2 relay 1 control Pin3 relay 2 control The AS 604 is supplied with two links LK 1 amp LK 2 bridging resistors R3 and R6 respectively This configuration sets the gain to 6 dB in stereo to mono mix mode To change attenuation in this mode to 3 dB remove links LK 1 amp LK 2 0704 aa ibw doc page 22 of 23 25 05 98 Unless otherwise specified all references on diagrams to AA 604 refer equally to the AA 704 Drawing Sheet 802827 802735 1 803538 803664 803540 802739 803006 803004 803013 0704 aa ibw doc Drawing list index Description AA 604 block diagram AA 604 main circuit schematic RB 733 rear assembly with Phoenix connectors RB 733T rear assembly with Krone IDC connectors RB 704 rear assembly 10 x RCA phono connectors CAA 3131 Remote control sub board AG 604SW Switched oscillator sub module AG 604ST Stereo oscillator sub module AS 604 Stereo control sub module page 23 of 23 25 05 98 129209 On WwBOYIO 201g Wald diy NOILNSIMLSIO voo vv 5411 4 7 0801N03 340v
19. nce See main module specifications for other specifications Frequency Response Harmonic Distortion Noise Attenuation Power requirements Power consumption Other Temperature range Dimensions Standard accessories Optional accessories 100 potentiometer Not supplied On rear assembly of main module 3 pin female polarised 1300 103 426 CCW connection of the potentiometer GND Rotor connection 1 in series with 12 Vdc 0 0 5 dB 20 Hz to 20 KHz lt 0 196 20 Hz to 20 KHz at 20 dBm 100 dB Ref 24 dBm 20 Hz to 20 KHz 75 dB Measurement for stereo fade mode 12 Vdc from main module See main module specifications 0 50 C ambient 65 mm x 48 mm Matching connector for control input type 1300 103 426 Instruction manual CIRCUIT DESCRIPTION The circuit uses a TDA1074A variable gain control IC to perform the configured function Configuration is by means of resistors which determine the function as shown on diagram 802739 The input control circuit is isolated from the signal path and uses DC control which is filtered by the combination of R2 amp 1 to provide immunity to noise either in the external wiring or in the operation of the external potentiometer The operating range is determined by the type of cable used and the degree of noise in the environment For best results over long distances a low loss screened cable should be used and the route carefull
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21. ors are factory set and should not be adjusted unless a component has been changed They are not operational controls Before adjusting any of these controls allow time for the AA 704 to reach temperature stability RV 1 Left Common Mode Rejection Adjusted to reduce input common mode signals to a minimum at the output of the AA 704 RV 2 Right Common Mode Rejection Adjusted to reduce input common mode signals to a minimum at the output of the AA 704 0704 aa ibw doc page 7 of 23 25 05 98 CONFIGURATION The AA 704 may be configured for several modes of operation including remote control and conversion to a multi output oscillator with the addition of sub modules This is achieved by various link settings as outlined below The AA 704 is normally delivered set for stereo operation 6 dB maximum gain on both channels and no sub modules fitted Note 704 fitting of sub modules The RB 733T is supplied without a connector for remote control of sub modules If a sub module is to be fitted that requires remote control a 3 pin polarised header type 1100 8 103 01 should be fitted to the RB 733T PCB in the position provided between the left and right input sockets Configuration Summary 1 Sub modules No sub module LK 1 amp LK 2 soldered on board Any sub module Cut LK 1 amp LK 2 on board AR 604 Set to stereo mode as below AG 604SW Set to L mono mode as below LK 7 amp LK 8 are inoperative AG 604ST Set to stereo
22. ould be observed Where individual circuit cards are stored they should be placed in antistatic bags and proper antistatic procedures should be followed when inserting or removing cards from these bags Power AC mains supply Ensure that operating voltage of unit and local supply voltage match and that correct rating fuse is installed for local supply DC supply Ensure that correct polarity is observed and that DC supply voltage is maintained within the operating range specified Earthing AC mains supply Chassis earth connection of the equipment is via the earth connection on the three pin mains input This is a safety earth and must be connected DC supply Chassis earth connection of the equipment is via the positive terminal on the DC input The DC positive supply should be connected to earth at the supply A separate chassis earth connection is available on the centre connector of the DC input connector which may be connected if desired Signal earth Balanced audio signal Pin 1 of connector is connected to PSU earth for shielding purposes only Unbalanced audio signal outer of RCA phono connector is connected to PSU earth It is strongly recommended that where double insulated equipment is being used that a proper connection be made between the signal earth and true ground earth at some point in the external circuit 0704 aa ibw doc page 9 of 23 25 05 98 Installation in frame or chassis See details in separate sec
23. plifier functions as a voltage follower and has no effect on the phase or gain of either channel When RL 1 is activated the input to U 1 is switched from the non inverting to the inverting input resulting in a phase reversal of the left channel signal When RL 2 is activated the right channel output is switched from the right input to the left output and both left and right channels receive the signal from the left channel input of the main module In this mode the right channel input of the main module is disconnected from the circuit and gain control link LK 7 on the main board will have no effect When both RL 1 amp RL 2 are activated simultaneously the right output signal is derived from the left output as described above However in this case the right and left input signals are also switched to the inverting input of U 1 and summed via resistors 1 R 3 R5 amp 6 which determine the gain of the resultant mono mix Links LK 1 amp LK 2 are provided to bypass resistors R 3 amp R 6 respectively Both links should either be installed or removed Operation with only one link installed will result in the gain of the two channels not being matched under some circumstances With the links installed the gain is unity for each signal with an overall result of 6 dB for the resultant mix With LK 1 amp LK 2 removed the input signal from each channel is attenuated and the overall gain for each signal is reduced to 0 71 resulting in
24. t channel input to mono output Mix left and right channels to mono output with selectable 3 dB or 6 dB cut in signal level TECHNICAL SPECIFICATIONS IRT Eurocard Sub module Type AS 604 Control input Remote gain component Connections Pin 1 2 3 Performance See main module specifications for other specifications Operation modes Frequency Response Distortion Noise Attenuation mono mix mode Power requirements Power consumption Other Temperature range Dimensions Standard accessories Optional accessories Not supplied On rear assembly of main module 3 pin female polarised 1300 103 426 GND Relay 1 control Relay 2 control Remote selectable Only one mode is possible at any time Stereo normal Invert left channel phase Mono output from left input Mix of stereo input to mono output 0 0 5 dB 20 Hz to 20 KHz 0 196 at 20 dBm 100 dB wrt 24 dBm 3 dB or 6 dB selectable by links 12 Vdc from main module See main module specifications 0 50 C ambient 65 mm x 48 mm Matching connector for control input type 1300 103 426 Instruction manual 0704 aa ibw doc page 20 of 23 25 05 98 CIRCUIT DESCRIPTION The AS 604 is comprised of a single operational amplifier in series with the left channel audio whose gain is determined by four relays which determine the path and thereby the amplitude of the signals in the circuit With no relays activated the am
25. tion for selected frame type Note Fitting AA 704T with RB 733T into FR 722 No AC input plug is provided on the rear of the RB 733T PCB and the AC input must be provided direct to the 704 main module This is accomplished by fitting a 3 pin polarised header type 1100 8 103 01 to the main PCB in the position provided next to AC input fuses FS 1 amp FS 2 RCA phono rear assemblies Types RB 704 10 output amp RB 367 26 output Two types of rear assemblies are available with RCA phono connectors for use with domestic style equipment such as VHS machines where only unbalanced connections are provided Each is equipped with RCA connectors on all outputs with red and black bodies used to distinguish between left and right channels The two inputs may be equipped with either RCA phono connectors for unbalanced input or a 3 way Phoenix connector block for either balanced or unbalanced input Where the input is unbalanced the gain of the amplifier will be reduced by 6 dB and so the gain setting link for each channel should be adjusted to the next higher setting normally from 6 dB factory set to 12 dB See Configuration for details Where the rear assembly is equipped with the 3 way balanced Phoenix input connector it may be used for either balanced or unbalanced signal input When unbalanced signals are used they may be connected either between the input and input or between the input and Gnd terminals If connection
26. to observe the polarity markings on the rear assembly See also special comments above concerning RCA phono rear assemblies types RB 704 and RB 367 0704 aa ibw doc page 10 of 23 25 05 98 The following front panel and rear assembly drawings are not to scale and are intended to show approximate layout amp connection order only RB 733 L O P s R O P s 5 Qa 5 man EE E EL E E a 600 Ohm 600 Ohm m T 0704 aa ibw doc page 11 of 23 25 05 98 Rear assemblies with RCA type output connectors Note input connectors may be either RCA unbalanced or Phoenix balanced type 0704 aa ibw doc 2 3 8 8 LEFT amp MONO INPUT RIGHT INPUT page 12 of 23 O RB 367 m 3 5 2 yo Qa Qa LEFT amp MONO INPUT RIGHT INPUT INPUT 25 05 98 IRT Eurocard Sub board Type CAA 3131 GENERAL DESCRIPTION This plug in option for selected IRT audio distribution amplifiers can be configured to provide one of the following modes of operation STEREO FADE over 75 dB range STEREO TRIM of 6 dB CROSS FADE over 75 dB or 6 dB range MIX L R amp FADE both by up to 75 dB Only one mode of operation is possible at any time TECHNICAL SPECIFICATIONS IRT Eurocard Sub module Type CAA 3131 Control input Remote gain component Connections Pin 1 2 3 Performa
27. y chosen to avoid proximity to high level noise sources For short distances flat IDC ribbon cable will suffice 0704 aa ibw doc page 13 of 23 25 05 98 CONFIGURATION The main module must first be configured to accept the sub module This is achieved by various link settings as outlined in the main module manual The main module is normally delivered set for stereo operation and no sub modules fitted Before installing the CAA 3131 set the main module to stereo mode as detailed in main module instruction manual The AA 604 can be configured to provide one of the following modes of operation 1 Stereo Fade Up to 75 dB attenuation on both channels simultaneously 2 Trim As above but range limited to 6 dB 3 Cross Fade Fade down left fade up right fade down right fade up left Up to 75 dB range 4 Balance As above but range limited to 6 dB 5 Mix amp Fade Add left to right and fade both by up to 75 dB To configure these options see Drawing 802739 INSTALLATION Module To install the sub module onto the main module first ensure that the proper mode of operation has been selected on both the main and sub modules Then remove straps LK 1 and LK 2 on the main module Hold the sub module so that the legends on the sub board and the legends on the main module have the same orientation Place the sub module over the connector pins of the main module The 16 pins fit into 16 holes in the sub module Push the su
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