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2 Channel Wired Intercom Modular User Station
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    2 Channel Wired Intercom Modular User Station

    Item #: TX-MRT327A4F   •   MFG #: TX-MRT327A4F




    The MRT-327 is a 2-channel intercom station for use in RTS-TW intercom systems. It may be used as a headset station or as a speaker station (with an optional MCS-325 modular speaker). The MRT-327 may be installed in optional console or rack mount configurations.

    The MRT-327 can send and receive 20kHz call signals.
    The MIC on/off switch can be used as a momentary push-to-talk switch or as a latching on/off switch.
    The MRT-327 can receive 24kHz talk-off (mic kill) signals for deactivation of the MRT-327 microphone from a remote location.
    The microphone pre-amplifier circuit contains a limiter which helps to equalize output for different voice levels.
    The standard MRT-327 accepts a dynamic-mic headset used in conjunction with an external speaker located on the rear panel. It also has an optional jack for an MCP-90-xx gooseneck panel microphone.
    The MRT-327 receives operating power from the intercom line. It may be internally modified for local powering from a separate DC power supply or batteries.

    • Specifications

      • General:
      • Input DC Voltage:
      • Mode: 18 to 35 volts DC
      • Local Power: 15 to 35 volts DC (12 to
      • 15 volts DC, reduced performance)
      • DC Current Drawn from TW Line
      • Quiescent: 45mA ±10%
      • Operating, 25U phones: 75mA ±10%
      • Operating, 25U phones + call light:
      • 90mA ±10%
      • Operating, 8U speaker:
      • 240mA ±10%
      • Operating, 8U speaker + call light:
      • 300mA ±10%
      • DC Current Drawn from TW Line
        Microphone Preamplifier:
      • Input Impedance:
      • 470U ±5% (dynamic mic)
      • Source Impedance:
      • 200U, (nom.)
      • Maximum Input Level:
      • 150 millivolts
      • Frequency Response
      • (-54dB input): 100Hz to 8kHz ±3dB
      • Limiter Range:
      • 30dB
      • Carbon Mic Excitation Current:
      • 10mA, (nom.)
        Speaker Amplifier:
      • Maximum Voltage Gain:
      • 30dB
      • Frequency Response:
      • 100Hz to 8kHz ±4dB
      • Output Power:
      • 1.5 watts into 8U (nom.)
      • Speaker DIM (speaker muting during
      • mic activation) adjustable,
      • -4 to -30dB (Factory set to -6dB)
        Headphone Amplifier:
      • Voltage Gain:
      • 34dB
      • Output Voltage:
      • 8 volts peak-to-peak into 25U (nom.)
      • Output power:
      • ½ watt peak into 25U
      • Frequency Response:
      • 150Hz to 10kHz ±3dB
      • Headphone Impedance Range:
      • 25 to 600U (600 to 2000U with
      • reduced levels)
      • Sidetone Adjustment Range:
      • -20dB to full on
      • Dynamic Microphone Headset:
      • XLR type 6 pin female
      • Panel Microphone:
      • 1/4-inch standard phone jack, 3-circuit
      • Line Input:
      • One (1) XLR type 3-pin female and
      • one (1) XLR
      • Dimensions:
      • 1.71" (44mm) H x 8.2" (208mm) W x
      • 9.0" (228mm) D
      • Weight:
      • 2.75lb (1.25kg)
      • Construction/Finish:
      • Aluminum case, thermoplastic front
      • panel, light gray finish