StudioTech M46-00180 Introduction, Wire Interfaces, Model 46 Front Panel Model 46 Back Panel

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Introduction

The Model 46 is designed to interface

2-wire full-duplex party-line intercom cir- cuits with 4-wire audio circuits associated with matrix intercom systems. Other spe- cialized audio system interfacing applica- tions can also be supported. The Model

46 provides two independent full-featured

2-channel interfaces. Each interface con- tains two hybrid circuits which include automatic nulling capability. The analog circuitry, under software control, provides excellent audio quality and high return- loss. The interfaces are compatible with powered and unpowered 2-wire party-line circuits. They are capable of supplying DC power, allowing direct operation of devices such as user belt packs. Configuration set- tings allow the 2-wire and 4-wire interface circuitry to be compatible with a range

of nominal signal levels. Audio level me- ters provide user confirmation of system performance during setup and operation. Applications for the Model 46 include tele- vision sports and special event broadcast- ing, theme park and theater installations, corporate events, and industrial testing environments. Standard audio connectors are used for all input and output signals.

The Model 46 mounts in one space of a standard 19-inch rack enclosure and requires 100-240 volts, 50/60 Hz for operation.

2-Wire Interfaces

The Model 46’s 2-wire interfaces are optimized for direct connection with dual- channel party-line (PL) intercom circuits. In addition, single-channel party-line intercom circuits can also be connected. Many broadcast applications use the dual- channel TW-series from Telex®/RTS®, including their popular BP325 belt pack. Other industry-standard single- and dual- channel PL intercom systems, including those from Clear-Com®, are also directly compatible. To provide optimal signal matching and interface performance the nominal level of the Model 46’s 2-wire interfaces can be selected. Using DIP switches, accessible on the front panel, the nominal levels can be selected to be either –10 or –14 dBu, settings that should allow compatibility with virtually all party- line systems. For example, for applications that use equipment from RTS the –10 dBu setting is appropriate. For other equip- ment, such as that from Clear-Com, the –14 setting is correct.

Model 46 Front Panel

Model 46 Back Panel

Model 46 User Guide

Issue 2, September 2007

Studio Technologies, Inc.

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Contents User Guide This page intentionally left blank Table of Contents Issue 2, September Model 46 User Guide Model 46 Front Panel Model 46 Back Panel Wire InterfacesIntroduction Analog Hybrids with Auto Nulling Wire Interfaces Special Applications Pro Audio QualityDesign Philosophy Simple InstallationWire Audio Inputs and Outputs InstallationSystem Components Locating the ModelDetail of back panel showing line inputs and outputs Wire Line OutputsSingle-Channel Intercom Systems Wire Party-Line Intercom ConnectionsDual-Channel Intercom Systems Adapter cable wiring diagram Remote Control InputsIssue 2, September Model 46 User Guide Function AC Mains PowerWire Party-Line Power Source ConfigurationConfiguration Interface 1 Wire Nominal Audio Level Auto Terminate Disable Advanced ConfigurationAuto Null Button Operation Refresh DisableFactory Test OperationLevel Meters External Power Source Connecting Party-Line DevicesInternal Power Source Detail of front panel showing auto null section Auto NullAdvanced Operation Software Version Display Factory Test ModeTechnical Notes Model 72 Interface Not a TW-12B ReplacementGeneral Audio SpecificationsAppendix a Appendix B Appendix C