User Manual - IRT Communications
Contents
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8. Right channel LK 7 set as designated on PCB overlay for 6 12 or 18 dB max See also Configuration and Installation sections following Configuration The AAA 3130 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 AAA 3130 is normally delivered set for stereo operation 6 dB maximum gain on both channels and no sub modules fitted 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 CAA 3130 Set to stereo mode as below CAA 3132 Set to stereo mode as below AAO 3130 Set to stereo mode as below LK 7 amp LK 8 are inoperative 2 Stereo mono Stereo LK 3 amp LK 6 installed LK 4 not installed Mono L Input LK3 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 3130 aaa ib rev14 doc Page 5 of 18 06 07 2006 Installation Operational Safety WARNING Operation of electronic equipment involves the use of voltages and currents that may be dangerous to human life Note that under certain conditions dangerous potentials may exist in some circu
9. control sub board CAA 3132 Remote control sub board Page 18 of 18 06 07 2006
10. 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 3130 aaa ib rev14 doc Page 13 of 18 06 07 2006 Remote control CAA 3130 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 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 Pini common ground Pin2 relay 1 control Pin3 relay 2 control The CAA 3130 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 3130 aaa ib rev14 doc Page 14 of 18 06 07 2006 IRT Eurocard Sub board Type CAA 3132 General Description This plug in option for selected IRT audio distribution amplifiers can be configured to provide any two 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 two modes of operation are po
11. 3130 aaa ib rev14 doc Page 11 of 18 06 07 2006 IRT Eurocard Sub board Type CAA 3130 General Description The CAA 3130 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 left channel input to mono output B WN 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 CAA 3130 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 3130 aaa ib rev14 doc Page 12 of 18 Not supplied On rear assembly of main module 3 pin female polarised IDC 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 t 12 Vdc from main module See
12. DC on output Indicators Audio activity Performance Gain Frequency response Harmonic distortion Noise Crosstalk Left right Amplifier amplifier Power Requirements Power consumption Connectors 2130 standard Other Temperature range Mechanical Finish Front panel Rear assembly Dimensions Supplied accessories Technical Specifications IRT Eurocard module Type AAA 3130 Tranformerless balanced bridging gt 10 24 dBu 6 dB gain mode gt 55 dB 20 Hz to 20 kHz Transformerless balanced 10 10 mono or 5 L and 5 R 40 Q 24 dBu into 600 10 x 600 or up to 26 High Z lt 20 mV Transformerless balanced 2 L and R 3 5 mm lt 700 24 dBu into 600 1 lt 20 mV 2 front panel LED s set for 4 dBu 1 KHz user adjustable Internally linked to a maximum gain of 6 12 or 18 dB 0 0 3 dB for 20 Hz to 20 kHz 0 005 20 Hz to 20 KHz at 20 dBm 110 dB Ref 24 dBm 20 to 20 kHz 75 dB 20 Hz to 20 kHz 80 dB 20 Hz to 20 kHz 28 Vac CT 14 0 14 or 16 Vdc 5 VA Phoenix plugable screw block 0 50 C ambient Suitable for mounting in IRT 19 rack chassis with input output and power connections on the rear panel Grey 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 IRT Eurocard ZAA 3130 rear connector assembly with Phoenix plug
13. IR T Electronics Pty Ltd A B N 35 000 832 575 26 Hotham Parade ARTARMON N S W 2064 AUSTRALIA National Phone 02 9439 3744 Fax 02 9439 7439 International 61 2 9439 3744 61 2 9439 7439 Email sales irtelectronics com Web www rtelectronics com IRT Eurocard Types AAA 3130 Stereo Audio Distribution Amplifier 3130 aaa ib rev14 doc Page 1 of 18 06 07 2006 IRT Eurocard Types AAA 3130 Stereo Audio Distribution Amplifier Instruction Book Table of Contents Section Page General Description 3 Technical Specifications 4 Internal Adjustments 5 Configuration 5 Installation 6 Front amp rear panel connector diagrams 8 Sub modules 9 AAO 3130 FACTS stereo oscillator 9 CAA 3130 Remote mode amp phase control 12 CAA 3132 Dual remote control 15 Maintenance amp storage 17 Warranty amp service 17 Equipment return 17 Drawing index 18 This instruction book applies to units later than S N 9801000 3130 aaa ib rev14 doc Page 2 of 18 06 07 2006 General Description The IRT AAA 3130 is a high performance audio distribution amplifier Its features allow standardisation on one ADA type to perform many functions with consequent overall cost savings The AAA 3130 can be used for either mono or stereo signals Inputs and outputs are balanced connector types which can be wired for unbalanced operation if needed for duplicating applications Front panel access is provided for the gain adjustment of Left and Right channe
14. able compression screw terminals Matching connectors for audio inputs amp outputs supplied Due to our policy of continuing development these specifications are subject to change without notice 3130 aaa ib rev14 doc Page 4 of 18 06 07 2006 Internal Adjustments Factory settings The following adjustable resistors 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 AAA 3130 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 A 3130 RV 2 Right Common Mode Rejection Adjusted to reduce input common mode signals to a minimum at the output of the AA A 3130 User settings Audio activity indicators RV 5 Left amp Right Level detector threshold RV 5 is located on the reverse side of the main PCB To access this control it is necessary to remove the shield plate from the DA After adjustment the shield plate must be replaced to preserve the inter module crosstalk noise characteristics Note that RV5 sets the threshold level for both channels Detector threshold point is measured at the output of the DA This setting may be adjusted to a value consistent with normal operating level Factory setting 15 4 dBu 0 1 KHz Maximum gain Left channel LK 8 set as designated on PCB overlay for 6 12 or 18 dB max
15. e other output is fed via an FET which is gated on and off by a square wave oscillator to provide an output which 18 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 normal input circuitry of the distribution amplifier is bypassed when the oscillator is switched in by relay RL3 Control of frequency is by way of grounding contacts which activate relays and RL2 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 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 18 required In the absence of any remote input both relays will turn off and the oscillator will default to 400 Hz RL3 must be switched on for the oscillator output to be switched to the main board outputs With RL3 switched off the main board functions as a normal audio distribution amplifier Configuration Before installing the AAO 3130 on the main board AAA 3130 cut the on board links LK1 and LK2 Ensure the main board is set for stereo operation as outlined in AAA 3130 the main module section For pulsed tone on right channel on AAO 3130 sub board set link settings to LK1 c
16. he input control circuits are isolated from the signal path and use DC controls which are filtered by the combinations of R 2 C 1 amp R4 C7 to provide immunity to noise either in the external wiring or in the operation of the external potentiometers 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 carefully chosen to avoid proximity to high level noise sources For short distances flat IDC ribbon cable will suffice 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 18 normally delivered set for stereo operation and no sub modules fitted Before installing the CAA 3132 set the main module to stereo mode as detailed in main module instruction manual The CAA 3132 can be configured to provide any two 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 L R amp Fade Add left to right and fade both by up to 75 dB To configure these options see Drawing 804141 Installation Module To install the sub module onto the
17. is recommended the whole unit be placed in a sealed plastic bag to prevent dust contamination In areas of high humidity a suitably sized bag of silica gel should be included to deter corrosion Where individual circuit cards are stored they should be placed in antistatic bags Proper antistatic procedures should be followed when inserting or removing cards from these bags Warranty amp Service Equipment is covered by a limited warranty period of three years from date of first delivery unless contrary conditions apply under a particular contract of supply For situations when Fault Found for repairs a minimum charge of 1 hour s labour at IRT s current labour charge rate will apply whether the equipment is within the warranty period or not Equipment warranty is limited to faults attributable to defects in original design or manufacture Warranty on components shall be extended by IRT only to the extent obtainable from the component supplier Equipment return Before arranging service ensure that the fault is in the unit to be serviced and not in associated equipment If possible confirm this by substitution Before returning equipment contact should be made with IRT or your local agent to determine whether the equipment can be serviced in the field or should be returned for repair The equipment should be properly packed for return observing antistatic procedures The following information should accompany the unit to be retur
18. its when power controls are in the OFF position Maintenance personnel should observe all safety regulations Do not make any adjustments inside equipment with power ON unless proper precautions are observed internal adjustments should only be made by suitably qualified personnel All operational adjustments are available externally without the need for removing covers or use of extender cards Pre installation Handling This equipment may contain or be connected to static sensitive devices and proper static free handling precautions should be observed Where individual circuit cards are stored they should be placed in antistatic bags 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 the correct polarity 18 observed and that DC supply voltage 18 maintained within the operating range specified Earthing The earth path is dependent on the type of frame selected In every case particular care should be taken to ensure that the frame 18 connected to earth for safety reasons See frame manual for details Signal earth For safety reasons a connection is made between signal earth and chassis earth No attempt should be made to break this connection 3130 aaa ib rev14 doc Page 6 of 18 06 07 2006 Instal
19. lation in frame or chassis See details in separate manual for selected frame type 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 The input and output connectors are 3 way balanced Phoenix connectors Where an unbalanced connection 18 required the signal may be connected between either the input and GND or the input and GND On the input only the unused input pin should be connected directly to GND Do not ground the unused output pin as this will damage the amplifier 3130 aaa ib rev14 doc Page 7 of 18 06 07 2006 Front amp rear panel connector diagrams The following front panel and rear assembly drawings are not to scale and are intended to show relative positions of connectors indicators and controls only O AAA 3130 D GAIN 3130 aaa ib rev14 doc A 9 0 o TTE SITIS E 3 3 E 3 3 2 Bi 8 WE 98 2 354 Page 8 of 18 a 2a eo E 06 07 2006 IRT Eurocard Sub module Type AAO 3130 General Description The AAO 3130 Four frequency switched stereo oscillator sub module converts the supporting main module audio distribution amplifier into a multi output reference stereo oscillator for test or alignment purposes Right channel can be set up for either pulsed interr
20. losed and LK2 open For continuous tone on right channel on AAO 3130 sub board set link settings to LK1 open and LK2 closed Left channel always remains as a continuous tone 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 3130 aaa ib rev14 doc Page 10 of 18 06 07 2006 Operation Remote control of frequency To switch in the oscillator relay RL3 must be switched on This is done by connecting pins 1 and 4 on the 4 pin header on the rear connector of the main module s rear connector unit The frequency of the oscillator may be set using pins 2 and 3 connected to pin 1 of the remote connector on the rear assembly of the main module If no connection is made the oscillator will default to 400 Hz operation 1234 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 Refer to Drawing 804213 for modes of operation Connect to Pin 1 GND 2 Default N C 2 amp 3 3
21. ls from zero output to the maximum of the selected gain range LED s on the front panel indicate the presence of audio on each channel and balanced output jacks are provided for front panel monitoring Optional plug in sub boards may be fitted to suit special applications 3130 FACTS stereo oscillator module Left continuous amp right interrupted with remote ADA oscillator control switching CAA 3130 Remote select Stereo L R L mono R mono and L phase reversal control module CAA 3132 Remote L amp R gain balance stereo mono and phase control module Applications e Stereo signal duplication and distribution Level matching and balancing Stereo mono switching Inline tone generation Standard features Selectable stereo or mono mode Balanced inputs and outputs Front panel monitoring jacks LED audio activity indicators Front panel gain adjustments Optional remote control Optional in line stereo tone generator Selectable gain ranges 6 dB 12 dB amp 18 dB Maximum output level 24 dBu Extended bandwidth option for ACS or timecode 3130 aaa ib rev14 doc Page 3 of 18 06 07 2006 Inputs Left Mono and Right Type Impedance Maximum input level Input CMR Outputs Main Located on rear assembly Type Number Impedance Maximum output level Maximum output loading DC on output Monitoring Located on front panel Type Number Impedance Maximum output level Minimum output load
22. 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 To control the two gain elements two remote 100 variable resistor should be wired between the pins of J3 on the main module rear assembly marked Remote 1 2 and 3 for the first element and 1 4 and 3 for the second element Connect Pin 1 to the bottom of both potentiometers CCW connection Pin 2 to the slider of the second element potentiometer rotor connection Trim Pin 3 to the top CW connection Pin 4 to the slider of the first element potentiometer rotor connection Balance 3130 aaa ib rev14 doc Page 16 of 18 06 07 2006 Maintenance amp storage Maintenance No regular maintenance is required Care however should be taken to ensure that all connectors are kept clean and free from contamination of any kind This is especially important in fibre optic equipment where cleanliness of optical connections is critical to performance Storage If the equipment is not to be used for an extended period it
23. main module specifications 0 50 C ambient 65 mm x 48 mm Matching connector for control input type 1300 103 426 Instruction manual 06 07 2006 Circuit Description The CAA 3130 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 amplifier 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 1 amp 2 are activated simultaneously the right output signal 18 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 R R 5 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 B
24. ned A fault report should be included indicating the nature of the fault The operating conditions under which the fault initially occurred Any additional information which may be of assistance in fault location and remedy A contact name and telephone and fax numbers Details of payment method for items not covered by warranty Full return address For situations when Fault Found for repairs a minimum charge of 1 hour s labour will apply whether the equipment is within the warranty period or not Contact IRT for current hourly rate Abe ee E Please note that all freight charges are the responsibility of the customer The equipment should be returned to the agent who originally supplied the equipment or where this 1s not possible to IRT direct as follows Equipment Service IRT Electronics Pty Ltd 26 Hotham Parade ARTARMON N S W 2064 AUSTRALIA Phone 61 2 9439 3744 Fax 61 2 9439 7439 Email _ service irtelectronics com 3130 aaa ib rev14 doc Page 17 of 18 06 07 2006 Drawing index Unless otherwise specified all references on diagrams to AA 604 or AA 704 refer equally to the AAA 3130 Drawing Sheet 804137 1 804137 2 804213 804388 804141 3130 aaa ib rev14 doc Description AAA 3130 stereo audio distribution amplifier main circuit schematic AAA 3130 stereo audio distribution amplifier audio monitoring circuit schematic AAO 3130 Switched frequency stereo oscillator sub board CAA 3130 Remote
25. oth 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 Whth 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 a 3 dB mix Note that if the links are removed for the 3 dB mix option that operation of RL 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 CAA 3130 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
26. ssible at the same time Technical Specifications IRT Eurocard Sub module Type CAA 3132 Control input Remote gain component Connections Pin 1 2 3 4 Performance 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 3130 aaa ib rev14 doc Page 15 of 18 10 KQ potentiometer Not supplied One required for each of the two functions On rear assembly of main module 4 pin female polarised IDC 1300 104 426 CCW connection of the potentiometers GND Rotor for first gain element CW connection of the potentiometers 1 KQ in series with 12 Vdc Rotor for second gain element 0 0 5 dB 20 Hz to 20 KHz 0 196 20 Hz to 20 KHz at 20 dBm 94 dB Ref 24 dBm 20 Hz to 20 KHz 7 75 dB Measurement for stereo fade mode t 12 Vdc from module See main module specifications 0 50 C ambient 65 mm x 48 mm Matching connector for control input type 1300 104 426 Instruction manual 06 07 2006 Circuit Description The circuit uses a TDA1074A variable gain control IC to perform the configured function Configuration is by means of resistors that determine the function as shown on diagram 804141 As received from the factory the first element is set to Stereo Trim and the second element to Stereo Balance T
27. upted every second or continuous operation This configuration conforms to the recommended practice of FACTS Federation of Australian Commercial Television Stations for channel identification Provision is made to remotely switch the frequency to a fixed 40 Hz 400 Hz 1 kHz or 10 kHz tone Technical Specifications IRT Eurocard Sub module Type AAO 3130 Control input Remote switch component Connections Pin 1 2 3 4 Performance See main module specifications for other specifications Distortion Frequency Power requirements Power consumption Other Temperature range Dimensions Standard accessories Optional accessories 3130 aaa ib rev14 doc Page 9 of 18 Single pole 4 position or equivalent Not supplied On rear assembly of main module 4 pin female polarised IDC 1300 104 GND Relay 1 control Relay 2 control Relay 3 control Oscillator On 0 01 at 8 dBm Remote selectable to 40 Hz 400 Hz 1 kHz or 10 kHz t 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 104 Instruction manual 06 07 2006 Circuit Description The circuit comprises of a low distortion Wein bridge oscillator an astable multivibrator and a voltage controlled switch with a remote control facility to select the operating frequency The oscillator output 18 passively split with one output fed directly to the left output Th
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