Studio Technologies Model 47A
Dual 2-Wire Analog Audio to 4-Wire Analog Audio Party-Line Interface


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The Studio Technologies Model 47A is designed to interface 2-wire full-duplex party-line (PL) intercom circuits with 4-wire audio circuits associated with matrix intercom systems. Other specialized audio system interfacing applications can also be supported. The Model 47A provides two independent full-featured 2-channel interfaces. Each interface contains 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 to devices such as user beltpacks and user stations. Independent power sources are provided for both channels (pins 2 and 3) of each interface, allowing direct support for broadcast source assignment panel (SAP) applications. Configuration settings allow the 2-wire and 4-wire interface circuitry to be compatible with a range of nominal signal levels. Audio level meters provide user confirmation of system performance during setup and operation. Applications for the Model 47A include mobile and fixed television facilities, theme park and theater installations, and industrial testing environments. Standard audio connectors are used for all input and output signals. The Model 47A mounts in one space (1U) of a standard 19-inch rack enclosure and requires 100-240 V, 50/60 Hz for operation.

Studio Technologies Model 47A Features:

  • Two 2-channel party-line intercom interfaces
  • Four analog hybrids with auto null capability
  • Input and output level metering
  • Excellent audio quality
  • 2-channel intercom power sources
  • Direct support for broadcast SAP panel applications
  • Standard audio connectors
  • Universal input mains powered

Studio Technologies Model 47A Specifications:

  • General Audio:
    • Frequency Response:  100 Hz - 8 kHz ┬▒2dB
    • Distortion (THD+N):  less than 0.5%, measured at 1 kHz, 4-wire input to 2-wire interface pin 2
    • Signal-to-Noise Ratio:  Greater than 55dB, measured at 1 kHz, 4-wire input to 2-wire interface pin 2
  • Connectors:
    • Inputs from 4-Wire:  3-pin Female XLR
    • Outputs to 4-Wire:  3-pin Male XLR
    • 2-Wire Party-Line Intercom:  3-pin Male XLR
    • Remote Control:  10-pin header, requires user-provided 10-pin ribbon connector assembly
    • AC Mains:  3-blade, IEC 320 C14 (mates with IEC 320 C13)
  • 2-Wire Party-Line Intercom Interfaces:
    • Total:  2
    • Type:  2-channel party-line (PL), unbalanced (pin 1 common; pin 2 channel 1 audio or DC with channel 1 audio; pin 3 channel 2 audio or DC with channel 2 audio)
    • Compatibility:  Single- and 2-channel intercom systems such as from RTS and ClearCom
    • Impedance, External Power Mode:  Greater than 10 kOhms
    • Impedance, Internal Power Mode:  200 Ohms
    • Nominal Level:  -10 or -14dBu, selectable
    • "Mic Kill" Singal:  Square wave, 24 kHz ┬▒1%
  • 2-Wire Party-Line Power Sources:
    • Total:  4, 2 per interface
    • Rating:  30 Vdc nominal, 315 mA maximum, software monitored and controlled
  • NOTE:  For further specifications on thisproduct, please refer to the attached Data Sheet under the DocumentationTab
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