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
