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Table of Contents
Summary of Contents for StudioTech Model 46 Interface
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Page 1: User Guide
User Guide Issue 2, September 2007 This User Guide is applicable for serial numbers: M46-00180 and later and units upgraded with software version 1.3 and higher Copyright © 2007 by Studio Technologies, Inc., all rights reserved www.studio-tech.com 50110-0907, Issue 2... - Page 2 This page intentionally left blank.
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Page 3: Table Of Contents
Table of Contents Introduction ..............5 Installation ..............10 Configuration ..............16 Advanced Configuration ..........18 Operation ..............20 Advanced Operation ............. 25 Technical Notes ............. 26 Specifications ..............28 Appendix A—Interfacing with Telex®/RTS® Matrix Intercom Systems ..........29 Appendix B—Interfacing with Riedel® Artist™ Matrix Intercom Systems .......... - Page 4 This page intentionally left blank. Issue 2, September 2007 Model 46 User Guide Page 4 Studio Technologies, Inc.
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Page 5: Introduction
The Model 46 mounts in one space Introduction of a standard 19-inch rack enclosure The Model 46 is designed to interface and requires 100-240 volts, 50/60 Hz for 2-wire full-duplex party-line intercom cir- operation. cuits with 4-wire audio circuits associated 2-Wire Interfaces with matrix intercom systems. - Page 6 The Model 46’s 2-wire interfaces can intercom power source ensures that sys- correctly function with powered (“wet”) tems requiring long intercom cable runs or unpowered (“dry”) intercom circuits. will function correctly. The circuitry’s out- Powered circuits have a DC voltage pres- put regulation is such that little change in ent, typically provided by power supplies the output voltage will occur over its entire...
- Page 7 are especially sensitive to this requirement. 4-Wire Interfaces The Model 46’s sophisticated auto nulling Associated with the 4-wire portion of the function uses analog circuitry under mi- Model 46’s interfaces are analog line-level croprocessor control to achieve significant inputs and outputs. These are intended trans-hybrid loss.
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Page 8: Special Applications
and out of the unit. Additional LED status circuits. This, along with other circuitry that indicators are also provided, offering a clear monitors DC voltages present on the view of the 2-wire DC power and auto null 2-wire circuits, ensures that audio instabil- functions. -
Page 9: Simple Installation
Simple Installation apparent that installing and configuring existing 2-wire-to-4-wire interface units The Model 46 uses standard 3-pin XLR- was invariably a time-consuming, aggravat- type connectors to allow convenient inter- ing process that required the talent of an connection in most broadcast and general expert to achieve reasonable results. -
Page 10: Installation
typically connected to 2-wire party-line link the unit with the connected devices. circuits. By adding DC power sources to This is really only a factor in relation to the the Model 46’s 2-wire interfaces, the need 2-wire party-line intercom circuits. These for external intercom power supplies could circuits carry unbalanced audio which often be eliminated. - Page 11 connected. The source for these signals remove a potential ground current path will typically be ports on a matrix intercom from the Model 46’s earth/chassis ground system. It’s also possible that the signals point through the shield of a cable. Also, if will come from other devices, such as a a hum or noise issue does arise be certain fiber optic or copper-based audio trans-...
- Page 12 outputs are capable of driving inputs that and two on the front. They are organized have impedances as low as 600 ohms, in groups of two connectors per interface, however connecting to loads of 2 k ohms one on the back and one on the front. or greater is preferred.
- Page 13 associated with each Model 46 interface. Refer to the Configuration and Advanced In these applications one might want Configuration sections of this user guide to view the Model 46 as providing four for details. 2-wire-to-4-wire interface circuits. The Remote Control Inputs Model 46 can certainly be used in this fashion, but adapter cables will have to be The Model 46 allows connection of three...
- Page 14 with a 12 volt DC signal using a 560 ohm, onto a piece of 10-conductor flat ribbon ¼-watt resistor in series with the connec- cable. This ribbon cable can safely exit tion would be appropriate. With a 24 volt the Model 46 by laying flat between the DC control signal a series resistor of 1.8 k chassis and the cover.
- Page 15 is part number A1AXH-1036G-ND which is It’s important that a competent techni- available from Digi-Key (www.digikey.com). cian be available to perform the actual remote control input connection process. It’s important to ensure that the source As expected, mating the interconnecting of the remote control signals can meet cable assembly with the Model 46’s 10- the Model 46’s logic-state and timing re-...
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Page 16: Configuration
Connection Wire Color Configuration – Interface 1 Neutral (N) Light Blue and 2 Line (L) Brown The DIP switch assemblies associated with Earth/Ground (E) Green/Yellow interface 1 and 2 are accessible on the Model 46’s front panel. They provide identi- Safety Warning: The Model 46 does cal capability for their respective interfaces. - Page 17 power supply is providing power to the 4-Wire Nominal Audio Level intercom circuit. In addition to power, it’s DIP switches 3 and 4 are used to config- expected that the external power supply ure the nominal level of the input and out- will also provide the required 200 ohm ter- put circuitry associated with interface 1’s minating impedance to both pins 2 and 3.
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Page 18: Advanced Configuration
are connected to the Model 46. In this lat- Advanced ter case only one of the Model 46’s audio channels will be used. Configuration There may be situations where it’s nec- Four DIP switches are provided on the essary for the two channels associated Model 46’s back panel. - Page 19 The auto terminate disable function should This is provided specifically for cases be used only when absolutely necessary; where the Model 46’s 2-wire party line it’s possible that a significant downside interfaces will be used with dual channel could be experienced. With auto terminate intercom user devices.
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Page 20: Operation
longer passing through this component ESD-induced audio path problem could and on to the 4-wire audio output. When- occur. A good “rule of thumb” is that if a ever this situation arose the component Model 46 is mounted in an equipment rack was not damaged, but restoring the flow of with a known-good ground connection, audio required either a power down/power... - Page 21 completion, the power LED will light an excessive level condition, but it does steadily. The settings for the four hybrid provide a warning that at some stage circuits are stored in non-volatile memory reducing the signal level may be prudent. and will be recalled during the power-up Normal operation with normal signal levels process.
- Page 22 ADAM system has a published nominal of at least 6 dB. Removing the unwanted level of +8 dBu, but using its configuration termination is really the only valid means software it’s possible to set panels or ports of correcting the problem. to a level different than nominal.
- Page 23 external 2-wire power mode the Model 46 mount component technology and have is simply an observer; whether intercom a lower maximum current draw of 65 mil- power is present on pin 2, pin 3, or both liamperes. Four of these “modern” BP325 pins 2 and 3 is not significant.
- Page 24 Auto Null An actual auto null sequence starts by muting the 4-wire input and output signal Each of the Model 46’s dual-channel inter- paths associated with the specific channel faces has circuitry to automatically null the to be nulled. Then a short period of 24 kHz two 2-wire-to-4-wire interfaces.
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Page 25: Advanced Operation
active microphones. While the automatic As a visual aid, LEDs on the front panel “mic kill” signal will apply to many user will display the DC power status of pins devices it may not apply to all. Muting 2 and 3. But when auto terminate disable microphones is significant as obtaining a mode is active the LEDs will no longer “deep”... -
Page 26: Technical Notes
Factory Test Mode Technical Notes Back-panel DIP switch 4 allows a factory Software Version Display test mode to be enabled. During normal operation switch 4 should remain in its off A special Model 46 power-up sequence (down) position. When switch 4 is in its on allows the unit’s software version number (up) position factory mode is active. - Page 27 To display the Model 46’s software version tasks. But it’s not intended to act as a is very simple. From the powered-down “universal” 2-wire-to-2-wire interface such state, press and hold the auto null button as is provided by the venerable Clear-Com associated with interface 1.
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Page 28: Specifications
Specifications 4-Wire Inputs: 4, 2 per interface General Audio: Frequency Response: ±2 dB 100 Hz to 8 kHz Type: transformer-coupled, capacitor isolated Distortion (THD+N): <0.5%, measured at 1 kHz, Impedance: 13 k ohms 4-wire input to 2-wire interface pin 2 Nominal Level: 0, +4, +6, or +8 dBu, selectable in tandem with nominal output level Signal-to-Noise Ratio: >55 dB, measured at 1 kHz,... -
Page 29: Appendix A-Interfacing With Telex®/Rts® Matrix Intercom Systems
Appendix A Interfacing Telex®/RTS® Matrix Intercom Systems with the Model 46 Interface ADAM™ Matrix Intercom System Analog Ports to Model 46 Interface RVON-I/O I/O Connections to Model 46 Interface Model 46 User Guide Issue 2, September 2007 Studio Technologies, Inc. Page 29... -
Page 30: Appendix B-Interfacing With Riedel® Artist™ Matrix Intercom Systems
Appendix B Interfacing Riedel® Artist™ Matrix Intercom System Analog Ports with the Model 46 Interface Issue 2, September 2007 Model 46 User Guide Page 30 Studio Technologies, Inc. -
Page 31: Appendix C-Interfacing With Clear-Com® Matrix Intercom Systems
Appendix C Interfacing Clear-Com® Matrix Intercom System Analog Ports with the Model 46 Interface Model 46 User Guide Issue 2, September 2007 Studio Technologies, Inc. Page 31...
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