Studio Technologies 45A User Manual
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Studio Technologies 45A User Manual

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User Guide
Issue 3, August 2015
This User Guide is applicable for serial numbers
M45A-00151 and later
Copyright © 2015 by Studio Technologies, Inc., all rights reserved
www.studio-tech.com
50217-0815, Issue 3

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  • Page 1 User Guide Issue 3, August 2015 This User Guide is applicable for serial numbers M45A-00151 and later Copyright © 2015 by Studio Technologies, Inc., all rights reserved www.studio-tech.com 50217-0815, Issue 3...
  • Page 2 This page intentionally left blank.

  • Page 3: Table Of Contents

    Appendix B—Interfacing with Riedel® Artist™ Matrix Intercom Systems ..........29 Appendix C—Interfacing with Clear-Com® Matrix Intercom Systems ..........30 Appendix D—Model 45A Interface Front-Panel Configuration DIP Switch Settings ........ 31 Model 45A User Guide Issue 3, August 2015 Studio Technologies, Inc.

  • Page 4: Revision History

    Issue 5, August 2015: 1. Minor corrections and adds figures for clarity. Issue 2, November 2011: 1. Minor corrections and enhancements. Issue 1, April 2011: 1. Initial release. Issue 3, August 2015 Model 45A User Guide Page 4 Studio Technologies, Inc.

  • Page 5: Introduction

    “1/2-rack” form factor that meets loss. the needs of broadcast “throw-down” The Model 45A can be powered by an ex- applications. Optional front panels allow ternal source of 24 volts DC. The circuitry one or two Model 45A units to be mounted...
  • Page 6 DC, as well as providing an alert beltpacks. A configuration setting is used by way of a visual indicator. to select how the Model 45A will impact the connected 2-wire circuit. In the default An auto terminate function ensures that mode the Model 45A’s circuitry maintains...
  • Page 7 Some digital matrix intercom systems use other nominal levels but with Whenever a user presses the Model 45A’s their configuration flexibility they can be auto null pushbutton switch digital circuitry easily adjusted to match the Model 45A.
  • Page 8 The Model 45A’s audio circuitry was Special Applications designed in the spirit of professional audio equipment, rather than that found While the Model 45A is designed to di- in typical party-line intercom gear. High- rectly integrate into typical applications, performance components are used it’s ready to support the “one-in-a-million”...
  • Page 9 2-wire-to-4-wire interface equipment fits into operation virtually anywhere in the world. actual applications. The Model 45A can also be powered by the An important first step was to eliminate connected 2-wire party-line intercom circuit. the requirement that a senior technician,...

  • Page 10: Installation

    A subtle but critical requirement was the mounted in either a 19-inch or a special need for the Model 45A to receive its oper- 10.5-inch equipment rack. ating power from either an external 24 volt...
  • Page 11 Reat- single-unit rack-mount panels, begin the tach the 3-pin male XLR assembly to the Figure 3. Model 45A shown in optional single-unit “1/2-rack” front panel Model 45A User Guide Issue 3, August 2015 Studio Technologies, Inc.
  • Page 12 +4 dBu. to two Model 45A units. Store both of the removed standard front panels for pos- Audio sources are connected to the line sible later use.
  • Page 13 300 milliamperes of current. This moder- male XLR connectors which are located ate amount of power requires that the type on the Model 45A’s back panel. Refer to and number of connected user devices Figure 4 for a detailed view.
  • Page 14 Pin 2, the Model the 2-wire power source configuration DIP 45A’s audio channel 1, will only be used for switch 2 must be set to its off (down) posi- connecting DC power to the connected de- tion.
  • Page 15 24 volts, correct operation will take place this arrangement. First of all, compared to over a 20 to 28 volt range. The Model 45A most intercom beltpacks the Model 45A requires 750 milliamperes for correct op- is a power “hog,”...

  • Page 16: Configuration

    Model 45A. This is because for the Model 45A. When the switch is in its the intercom circuit’s DC voltage will drop off (down) position the intercom circuit can- in direct relation to the length of the in- not be used to power the Model 45A.
  • Page 17 Trying to draw current from a circuit that’s not capable of supply- ing the needs of the Model 45A will typically result in greatly degraded intercom audio quality. This is because the Model 45A’s power supply circuit will always attempt to draw the current it requires.
  • Page 18 Figure 8. Auto null button switch settings operating conditions. It can only be active when the Model 45A is not serving as the When configuration DIP switch 3 is in intercom power source. The auto termi-...
  • Page 19 DC voltage won’t be pres- when the auto nulling process is active. ent on either pin 2 or 3 and the Model 45A There may be cases, primarily at the fac- will automatically apply 200 ohm termina- tory, where it’s desirable to have the null-...

  • Page 20: Operation

    flexible chan- of 24 volts DC will be connected to the nel assignments can be made. In the ex- Model 45A. Typically this will be in the form ternal 2-wire power mode the Model 45A of the external power supply provided is simply an observer;...
  • Page 21 “lifted.” initial 5-second period monitoring be- comes active. A fault condition is detected When the Model 45A is Serving as the if the power on pin 2 falls below 24 volts 2-Wire Intercom Power Source for a continuous 1-second interval. The When configuration DIP switch 2 is set...
  • Page 22 (For this example, the level on the 2-wire to the best system performance, including party-line circuit is just large enough to light correct interfacing with the Model 45A. But the 0 LED.) This indicates that a signal with often it’s impossible to “clean up” the levels an approximate level of +4 dBu is present of an existing system.
  • Page 23 Normally this process is performed ed user devices that are compatible with at the time of initial Model 45A configuration the RTS TW-series “mic kill” protocol. The but there’s no reason why “auto nulling”...
  • Page 24 “deep” null requires that no extra- But whether or not either or both LEDs are neous signals be present on the intercom lit, the Model 45A will never apply 200 ohm circuit. terminations to pins 2 or 3. For the hybrid...

  • Page 25: Technical Notes

    Model 1 through 5. Refer to Figure 12 for a de- 45A a trip back to the factory is required tailed view of the LEDs and the correspond- to update it. The 8-bit microcontroller that ing software version numbering scheme.
  • Page 26 45A to be activated. Refer to Figure 13 for 2-wire “bridge.” This should, in theory, details. create an updated and improved version Figure 13. Two Model 45A units connected as a universal 2-wire-to-2-wire bridge Issue 3, August 2015 Model 45A User Guide Page 26...

  • Page 27: Specifications

    Weight: 1.8 pounds (0.82 kg), rack-mount front Maximum Level: +22 dBu panel adds 0.2 pounds (0.09 kg) Specifications and information contained in this User Guide subject to change without notice. Model 45A User Guide Issue 3, August 2015 Studio Technologies, Inc. Page 27...

  • Page 28: Appendix A-Interfacing With Rts® Matrix Intercom Systems

    Appendix A Interfacing RTS® Matrix Intercom Systems with the Model 45A Interface ADAM™ Matrix Intercom System Analog Ports to Model 45A Interface RVON-I/O I/O Connections to Model 45A Interface Issue 3, August 2015 Model 45A User Guide Page 28 Studio Technologies, Inc.

  • Page 29: Appendix B-Interfacing With Riedel® Artist™ Matrix Intercom Systems

    Appendix B Interfacing Riedel® Artist™ Matrix Intercom System Analog Ports with the Model 45A Interface Model 45A User Guide Issue 3, August 2015 Studio Technologies, Inc. Page 29...

  • Page 30: Appendix C-Interfacing With Clear-Com® Matrix Intercom Systems

    Appendix C Interfacing Clear-Com® Matrix Intercom System Analog Ports with the Model 45A Interface Issue 3, August 2015 Model 45A User Guide Page 30 Studio Technologies, Inc.

  • Page 31: Appendix D-Model 45A Interface Front-Panel Configuration Dip Switch Settings

    Appendix D Model 45A Interface Front-Panel Configuration DIP Switch Settings 2-wire (PL) input power switch settings Auto terminate switch settings 2-wire (PL) power source switch settings 4-wire mute during auto null switch settings Auto null button switch settings Model 45A User Guide Issue 3, August 2015 Studio Technologies, Inc.

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