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Telex MRT-327 2-Channel User Station (A4F)

Telex MRT-327 2-Channel User Station (A4F)

B&H # TEMRT327A4F MFR # F.01U.118.526
Telex MRT-327 2-Channel User Station (A4F)

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Important Notice: This item is non-cancelable and non-returnable
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Expected availability: 7-14 business days 
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Product Highlights

  • For A4F Type Headsets
  • Call Signaling: 20kHz Call Signals
  • Dual-Action Momentary Switch
  • Talk-Off 24kHz Deactivatin Signal
  • Microphone Limiter
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  • 1Description

The Telex MRT-327 2-Channel User Station is a base station used for RTS TW intercom systems. The station provides flexible routing, microphone input, call signaling, a built in limiter and more. It may be used as a headset or a speaker station with the optional MCS325 modular speaker.

An optional rackmount kit may be purchased for installation into a 19-inch rack. Its dual-action on/off switch allows for momentary and latching push-to-talk functions. The MRT-327 can receive 24kHz "talk off" signals for deactivation of the MRT-327's microphone from a remote location. Additional features include a built-in microphone limiter and optional speaker operation.

Call signaling
Dual-action momentary/latching mic switch
Microphone limiter
Optional microphone speaker & headset configurations
Powering options
Remote deactivation
UPC: 800549425476
In the Box
Telex MRT-327 2-Channel User Station (A4F)
  • 1 Year Warranty
  • Table of Contents
    • 1Description
    General Input DC voltage:
    TW 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: 45 mA +/- 10%
    Operating, 25 ohm phones: 75mA +/- 10%
    Operating, 25 ohm phones + call light: 90mA +/- 10%
    Operating, 8 ohm speaker: 240mA +/- 10%
    Operating, 8 ohm ohm speaker + call light: 300mA +/- 10%

    Operating current is measured with output level at 10dB below clipping. Local power option draws no current from TW line.
    Impedance 10k ohms minimum (designed for use with 200-ohm "TW" intercom lines)
    Environmental Temperature:
    Operating: 32° to 140°F (0° to 60°C)
    Storage: -40° to 185°F (-40° to 85°C)
    Humidity: Operating and storage: 5% to 95%, non-condensing
    Noise Ch 1: > - 60dBu
    Ch 2: > - 80dBu
    Mic Preamp
    Input Impedance 470 ohms +/- 5% (dynamic mic)
    Source Impedance 200 ohms, nominal
    Maximum Input 150 millivots
    Frequency Response 100Hz to 8kHz +/- 3dB (-54dBu input)
    Limiter Threshold Range 30dB
    General Carbon Mic Excitation Current: 10mA, nominal
    Speaker Amplifier Maximum Voltage Gain: 30dB
    Frequency Response: 100Hz to 8kHz +/- 4dB
    Output Power: 1.5 Watts into 8 ohms nominal
    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 in to 25 ohms nominal
    Output power: 1/2 Watt peak into 25 ohms
    Frequency Response: 150Hz to 10kHz +/- 3dB
    Headphone Impedance Range: 25 to 600 ohms (600 to 2000 ohms with reduced levels)
    Sidetone Adjustment Range: -20dB to full on
    Additional Specifications
    Current Transfer Ratio: 3.3mA/volt=3.3 millisiemens
    Output: +/- 5mA into 200 ohms = +/- 1 volt peak, nominal
    Call Light Levels Signalling Frequency: 20kHz +/- 100Hz
    Flashing Rate: 5Hz +/- 2Hz

    Frequency: 24kHz nominal
    Connectors Dynamic Microphone Headset: XLR type 6-pin female
    Panel Microphone: 1/4" standard phone jack, 3-circuit
    Line Input: One XLR type 3-pin female and one XLR type 3-pin male, wired in parallel
    Finish Aluminum case, thermoplastic front panel, light gray finish
    Dimensions (HxWxD) 1.71 x 8.20 x 9" (44 x 208.3 x 228mm)
    Weight 2.75lb (1.25kg)
    Packaging Info
    Package Weight 3.65 lb
    Box Dimensions (LxWxH) 11.4 x 10.3 x 2.6"

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