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StudioTech M45-00151 manual

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  • Page 1

    Copyright © 2009 by Studio T echnologies, 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 M45-00151 and later[...]

  • Page 2

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  • Page 3

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 3 T able of Contents Introduction ................................................................... 5 Installation ..................................................................... 10 Configuration ..............................................................[...]

  • Page 4

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 4 Studio T echnologies, Inc. This page intentionally left blank.[...]

  • Page 5

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 5 Introduction The Model 45 is designed to interface 2-wire full-duplex party-line (PL) intercom circuits with 4-wire audio circuits associ- ated with matrix intercom systems. Appli- cations for the Model 45 include television sports and live-event broadcasting, the[...]

  • Page 6

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 6 Studio T echnologies, Inc. 2- W ire P arty-Line Interface The Model 45’s two-channel 2-wire party- line interface is optimized for direct connec- tion with a dual-channel party-line intercom circuit. In addition, single-channel party- line intercom circuits can also be connect- ed. Many b[...]

  • Page 7

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 7 of its 2-wire-to-4-wire hybrid circuits. Each of the two independent circuits provides low noise and distortion, good frequency response, and high return-loss (“nulling”), even when presented with a wide range of 2-wire party-line conditions. Unlike tele- phon[...]

  • Page 8

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 8 Studio T echnologies, Inc. of only 2 dB is required. The RTS ADAM™ series of matrix intercom systems has a nominal level of +8 dBu. This level also applies to their RVON-I/O V oIP products. As such, reducing their nominal input and output levels by 4 dB will ensure optimal compatibility .[...]

  • Page 9

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 9 audio quality , advanced users might need to disable it. This would allow full control over the Model 45’s two hybrid circuits, enabling them to be used in a completely independent manner . Simple Installation The Model 45 uses standard 3-pin XLR- type connector[...]

  • Page 10

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 10 Studio T echnologies, Inc. The next step was to identify resources that would improve the installation process and make operation more reliable. This led to the use of standard 3-pin XLR-type audio connectors, enabling rapid installa- tion and troubleshooting in any locale. The inclusion o[...]

  • Page 11

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 11 cables will help to ensure more reliable and consistent intercom system performance. The differential (“balanced”) 4-wire circuits are typically not impacted by the length of their interconnecting cables. A final location criterion is to provide access to the[...]

  • Page 12

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 12 Studio T echnologies, Inc. Once the desired one or two Model 45 units have been installed in a rack -mount front panel, the assembly can be mounted into the designated equipment rack. One space (“1U” or 1.75 vertical inches) in a standard 19-inch equipment rack is required. Secure the [...]

  • Page 13

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 13 unbalanced source in this manner results in hum or noise, connect XLR pin 2 to high (+ or hot) and pin 3 to shield; leave pin 1 unterminated. 4- Wire Line Outputs The Model 45’s dual-channel interface pro- vides two analog line-level audio outputs. These output[...]

  • Page 14

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 14 Studio T echnologies, Inc. pin 3 of the Model 45’s 2-wire party-line intercom interface, will be utilized. Pin 2, the Model 45’s audio channel 1, will only be used for connecting DC power to the connected devices. While the audio resourc- es provided by channel 1 will not be used, the [...]

  • Page 15

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 15 External 24 V olts as the Power Source As previously discussed, the Model 45 can be powered by a source of 24 volts DC. A “locking” 2.1 x 5.5 mm coaxial power jack is located on the back panel of the unit. The center pin of the jack is the positive (+) connec[...]

  • Page 16

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 16 Studio T echnologies, Inc. drop can become appreciable in situations where belt pack operation wouldn’t nor - mally be impacted. P erforming accurate calculations in this scenario is a bit more difficult but might be required to ensure a reliable installation. Initial Operation As soon a[...]

  • Page 17

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 17 external source of 24 volts is going to be connected switch 1 should be placed in its off (down) position. This ensures that a failure of the connected 24 volt DC source won’t cause the Model 45 to automatically revert to pulling power from the intercom circuit[...]

  • Page 18

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 18 Studio T echnologies, Inc. interface to be auto nulled at approxi- mately the same time. The dual auto null mode allows a single “tap” of the button to initiate nulling of both hybrid circuits. When configuration DIP switch 3 is in its on (up) position the independent auto null mode is[...]

  • Page 19

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 19 the Model 45’s 2-wire-to-4-wire converter circuitry . These audio artifacts will not cause any damage but will be sent out of the 4-wire line outputs. Users of the 4-wire equipment may be less than pleased with what they hear! 4- W ire Mute during Auto Null As [...]

  • Page 20

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 20 Studio T echnologies, Inc. are fully isolated from the 2-wire intercom circuit. In this situation the Model 45’s only function is to route, by way of the hybrids, the 2-wire interface’s audio signals to and from the 4-wire outputs and inputs. In this mode of operation the Model 45 acts[...]

  • Page 21

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 21 pin 2 falls below 24 volts for a continuous 1- second interval. The hardware and software responds to this condition by turning off the power source to pin 2 and flashing the pin 2 LED as a warning. After a 5-second “cool-down” interval the output returns to [...]

  • Page 22

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 22 Studio T echnologies, Inc. device’s nominal level matches the Model 45’s level setting its actual nominal level may be significantly different. With a digital matrix intercom system this problem could be due to an incorrect configuration hav- ing been made to a specific channel or port[...]

  • Page 23

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 23 An auto null sequence begins with the muting of the 4-wire input and output signal paths associated with the channel being nulled. This is followed by a short period of 24 kHz signal that is sent out the 2-wire party-line intercom interface channel. This will tur[...]

  • Page 24

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 24 Studio T echnologies, Inc. readily apparent. The front-panel LEDs will continue to display the DC power status of pins 2 and 3. But whether or not either or both LEDs are lit, the Model 45 will never apply 200 ohm terminations to pins 2 or 3. F or the hybrid circuits to remain stable termi[...]

  • Page 25

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 25 Note that while it’s easy to determine which software version is loaded into the Model 45 a trip back to the factory is required to update it. The 8-bit micro- controller that provides the unit’s logic “horsepower” also includes internal FLASH memory . Th[...]

  • Page 26

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 26 Studio T echnologies, Inc. unit. P ower can be provided 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. Refer to Figure 9 for details. Figure 9[...]

  • Page 27

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 27 Specifications General Audio: Frequency Response: ±2 .5 dB 100 Hz to 8 kHz Distortion (THD+N): <0. 2 %, measured at 1 kHz, 4-wire input to 2-wire interface pin 2 Signal-to-Noise Ratio: >55 dB, measured at 1 kHz, 4-wire input to 2-wire interface pin 2 2- W [...]

  • Page 28

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 28 Studio T echnologies, Inc. Interfacing RTS® Matrix Intercom Systems with the Model 45 Interface Appendix A ADAM ™ Matrix Intercom System Analog P orts to Model 45 Interface RVON-I/O I/O Connections to Model 45 Interface[...]

  • Page 29

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 29 Interfacing Riedel® Artist™ Matrix Intercom System Analog Ports with the Model 45 Interface Appendix B[...]

  • Page 30

    Issue Preliminary 2, March 2009 Model 45 User Guide Page 30 Studio T echnologies, Inc. Interfacing Clear-Com® Matrix Intercom System Analog P orts with the Model 45 Interface Appendix C[...]

  • Page 31

    Model 45 User Guide Issue Preliminary 2, March 2009 Studio T echnologies, Inc. Page 31 This page intentionally left blank.[...]