RTS MRT-327 2-Channel User Station

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.

RTS MRT-327 Features

• Call Signaling
• Dual-Action Momentary/Latching Mic Switch
• Microphone Limiter
• Optional Microphone Speaker & Headset Configurations
• Powering Options
• Remote Deactivation

• MRT-327 2-channel user station1

• 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, 25Ω phones: 75mA ±10%
  • Operating, 25Ω phones + call light: 90mA ±10%
  • Operating, 8Ω speaker: 240mA ±10%
  • Operating, 8Ω speaker + call light: 300mA ±10%
  • DC Current Drawn from TW Line
• Notes
  • Operating current is measured with output level at 10dB below clipping.
  • Local power option draws no current from TW line.
  • Impedance Across Line: 10kΩ, minimum (designed for use with 200Ω “TW” intercom lines)
  • Environmental Temperature: Operating: 0°C to 50°C (32°F to 122°F)
  • Storage: 40°C to 85°C (104°F to 185°F)
  • Humidity: Operating and Storage: 5% to 95%, non-condensing
  • Noise Contribution:
    • (Ch 2): <-60dBp
    • (Ch 1): <-80dBp
• Microphone Preamplifier
  • Input Impedance: 470Ω ±5% (dynamic mic)
  • Source Impedance: 200Ω, (nom.)
  • Maximum Input Level: 150 millivolts
  • Frequency Response (-54dB input): 100Hz to 8kHz ±3dB
  • Limiter Range: 30dB
  • Carbon Mic Excitation Current: 10mA, (nom.)
• Microphone Current SourceOutput: 3.3 mA into 200Ω = ±1 volt peak, (nom.)
• Speaker Amplifier
  • Maximum Voltage Gain: 30dB
  • Frequency Response: 100Hz to 8kHz ±4dB
  • Output Power: 1.5 watts into 8Ω (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 25Ω (nom.)
  • Output power: ½ watt peak into 25Ω
  • Frequency Response: 150Hz to 10kHz ±3dB
  • Headphone Impedance Range: 25 to 600Ω (600 to 2000Ω with reduced levels)
  • Sidetone Adjustment Range: -20dB to full on
• Call LightSignaling Frequency: 20kHz ±100Hz
• Talk-OffFrequency: 24kHz ±100Hz
• Connectors
  • Dynamic Microphone Headset: XLR type 6 pin female
  • Panel Microphone: ¼-inch standard phone jack, 3-circuit
  • Line Input: One (1) XLR type 3-pin female and one (1) XLR type 3-pin male, wired in parallel
• Mechanical
  • Dimensions (HxWxD): 1.71x8.2x9” (44x208x228mm)
  • Weight: 2.75lbs (1.25kg)
  • Construction/Finish: Aluminum case, thermoplastic front panel, light gray finish