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50216-0309, Issue Preliminary 2

User Guide

Issue Preliminary 2, March 2009

This User Guide is applicable for serial numbers

M45-00151 and later

Содержание M45 Interface

Страница 1: ...09 by Studio Technologies Inc all rights reserved www studio tech com 50216 0309 Issue Preliminary 2 User Guide Issue Preliminary 2 March 2009 This User Guide is applicable for serial numbers M45 0015...

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Страница 3: ...ents Introduction 5 Installation 10 Configuration 16 Operation 19 Technical Notes 24 Specifications 27 Appendix A Interfacing with RTS Matrix Intercom Systems 28 Appendix B Interfacing with Riedel Art...

Страница 4: ...Issue Preliminary 2 March 2009 Model 45 User Guide Page 4 Studio Technologies Inc This page intentionally left blank...

Страница 5: ...gned so that full isolation from the connected party line circuit is maintained Figure 2 Model 45 Back Panel Figure 1 Model 45 Front Panel The connected party line intercom circuit can also provide th...

Страница 6: ...ire interface is its ability to create a fully functioning 2 wire party line intercom cir cuit supplying the required DC power and 200 ohm AC terminations Referred to as the Model 45 s 2 wire PL power...

Страница 7: ...tton switch digital circuitry adjusts the analog hybrids to achieve their maximum return loss The nulling process takes approximately 12 seconds for each interface channel And it s important to highli...

Страница 8: ...being added to the 2 wire connection In addition the impedance characteristics of the interface s DC powered wet channel was tailored to be essentially identical to that of the unpowered dry channel T...

Страница 9: ...standard 19 inch rack enclosure Design Philosophy While the bits and pieces that make up the Model 45 have been described in con ventional terms the real strength of the unit rests in the way it integ...

Страница 10: ...on In this section you will be preparing the Model 45 for use Since the standard unit is housed in a self contained enclosure getting it ready for use in portable appli cations requires only making a...

Страница 11: ...mount front panel begin the process by remov ing the five screws that hold the standard throw down front panel to the Model 45 s chassis Using a Phillips screw driver remove the 4 40 flat head Phillip...

Страница 12: ...rcuitry is balanced capacitor coupled transformer isolated and has an impedance of 13 k ohms The line inputs are optimized for signals that have a nominal level of 4 dBu Audio sources are connected to...

Страница 13: ...nel party line intercom circuit This type of circuit typically has positive 28 to 32 volts DC on pin 2 and common on pin 1 The Model 45 s 2 wire party line interface can also serve as an intercom powe...

Страница 14: ...tly interconnected with two Clear Com intercom circuits However power for the connected devices must be provided by ex ternal power sources The Model 45 s ability to supply intercom power will not be...

Страница 15: ...s DC with a re quired current draw of 175 milliamperes Note that for the Model 45 to be powered by the connected 2 wire intercom circuit configuration DIP switch 1 must be in its on up position Please...

Страница 16: ...views Using the Connected 2 Wire Party Line Circuit as the Model 45 s Power Source Configuration DIP switch 1 is used to select whether or not the connected 2 wire intercom circuit can be used to prov...

Страница 17: ...r or not the Model 45 will serve as an intercom power source providing DC power and 200 ohm terminations to the intercom interface When switch 2 is in its off down position the Model 45 will not serve...

Страница 18: ...a cable support both DC power and two channels of audio It s also compatible in situations where all three conductors of a Clear Com single channel intercom circuit are con nected to the Model 45 In...

Страница 19: ...ation sequence before normal operation will begin The LEDs will light sequentially and upon completion the applicable input power LED will light The null settings for the two hybrid circuits are recal...

Страница 20: ...hm termination is expected to be provided elsewhere typically as part of the external power supply and the Mod el 45 s termination is lifted When the Model 45 is Serving as the 2 Wire Intercom Power S...

Страница 21: ...45 contains four 5 segment LED level meters These meters are provided as a support aid during installation con figuration operation and troubleshooting The meters represent the strength of the signals...

Страница 22: ...circuits depend on a single termination being present This termination typically 200 ohms is almost always made at the power supply source But it s possible that another device such as a second activ...

Страница 23: ...dsets during the process In addition to warning users it might be a good time to ask them to mute any active microphones While the automatic mic kill signal will apply to many user devices it may not...

Страница 24: ...ld remain in its off down position When switch 5 is in its on up position 4 wire muting dur ing auto null will not take place While not appropriate during actual Model 45 use it is interesting to hear...

Страница 25: ...d in a typical field shop or repair facility Two Units can be a TW 12B Replacement Two Model 45 units with their 4 wire in terface connectors linked in a crossover fashion can act as a universal 2 wir...

Страница 26: ...vided by the con nected intercom circuits or by way of an external source of 24 volts DC The final step to achieve correct performance is for the auto null function on each Model 45 to be activated Re...

Страница 27: ...brid Loss 40 dB typical at 800 Hz 4 Wire Inputs 2 Type transformer coupled capacitor isolated Impedance 13 k ohms Nominal Level 4 dBu Maximum Level 22 dBu 4 Wire Outputs 2 Type transformer coupled cap...

Страница 28: ...45 User Guide Page 28 Studio Technologies Inc Interfacing RTS Matrix Intercom Systems with the Model 45 Interface Appendix A ADAM Matrix Intercom System Analog Ports to Model 45 Interface RVON I O I...

Страница 29: ...Model 45 User Guide Issue Preliminary 2 March 2009 Studio Technologies Inc Page 29 Interfacing Riedel Artist Matrix Intercom System Analog Ports with the Model 45 Interface Appendix B...

Страница 30: ...Issue Preliminary 2 March 2009 Model 45 User Guide Page 30 Studio Technologies Inc Interfacing Clear Com Matrix Intercom System Analog Ports with the Model 45 Interface Appendix C...

Страница 31: ...Model 45 User Guide Issue Preliminary 2 March 2009 Studio Technologies Inc Page 31 This page intentionally left blank...

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