Telex MS-4002 4-Channel Master Station

Used – Acceptable: The item was removed from a working system. It is still functional in that, it still powers on. We are unable to verify any further functionality. Bears signs of wear such as scratches, dents, worn corners, or identifying markings. Parts, accessories, and instructions may be missing.

*Please note: One button is pushed out, as shown in the picture, unit still operates.

The Telex MS-4002 is four-channel, balanced audio master station and 4 amp system power supply in a single unit. You simply plug it into any AC power outlet from 100 to 240 volts, add a microphone or headset, connect intercom stations to the back panel, and you are ready to communicate. The MS-4002 is now equipped with an advanced programming mode on the front panel, eliminating the need for internal DIP switches. It also has a feature that automatically senses the type of headset attached to the unit, either dynamic or electret. The MS-4002 fits in a standard 19" equipment rack and is 1 rack unit high. The MS-4002 is Clear-Com compatible, with the ability to run in unbalanced mode.

FEATURES

• Auto-Sensing Headset Connector
• Speaker Station or Headset Station
• Voice Activated Microphone (VOX)
• Public Address (PA) Output, with PA key
• Back-lit Keys
• Incoming Call Indications
• Mic Kill Key
• Program Input for Each Channel
• Listening with External Powered Speakers
• Expandable
• Instantaneous Auto-Reset
• Clear-Com Compatible
• (This product is not CE certified.)

SPECIFICATIONS

GENERAL

• AC Input: 100-240VAC, 50/60Hz
• Channel Power: 24VDC nominal (18 to 30VDC), 65 to 150mA
• MS-4002 is capable of supplying 3.6A overall

Dynamic-mic Headset

• Microphone: 50 to 200Ω, dynamic (balanced or unbalanced)
• Headphones:  150 to 600Ω, monaural
• Connector Type: XLR-4M
• Microphone Type: Electret condenser
• Power: Phantom (+5VDC)
• Nominal Level: -42dBu
• Maximum Level: -25dBu
• Connector Type: IKP12 (MCP-90 series, stereo plug connector)

Program Input

• Input Level: 100mV maximum
• Voltage Gain: 25 ±3dB
• Output Level (to intercom channel): 1.0Vrms nominal 2.3Vrms max.
• Input Impedance: 75k
• Common Mode Rejection: >50 dB
• Connector Type: 9-pin female D-sub (DE9S)

Intercom Channels, Balanced Mode (Both Back Panel and internal switches (BAL/UNBAL) must be set to same setting) Output Level: 1

Vrms Nominal

• Input Impedance: 300Ω
• Bridging Impedance: >10kΩ
• Sidetone: -40dB, 35dB adjustable range
• Call Signaling:
  • Send: 20kHz ±100Hz, 0.5Vrms ±10%
  • Receive: 20kHz ±800Hz, 100mVrms
• Mic-Kill Frequency:
  • Send: 24kHz ±300Hz, 0.5Vrms ±10%
  • Detect: 24kHz ±800Hz, 100mVrms
• Noise Contribution: < -70dB
• Common Mode Rejection Ratio: >50dB
• Connector Type: One XLR-3M and XLR-3F pair, wired in parallel, for each channel (permits “loop-thru” connection).

Intercom Channel, Unbalanced Mode (Both Back Panel and internal switches (BAL/ UNBAL) have to be set to same setting)

• Output Level: 1Vrms ±10%
• Input Impedance: 200Ω
• Bridging Impedance: >10kΩ
• Call Signaling:
  • Send: 11 ±3VDC
  • Receive: 4VDC minimum

PA Output

• Output Level: 235mVrms nominal
• Connector Type: 1/8" Stereo Phone Jack

Speaker Output

• Output Level: 0 dB nominal (1.0Vrms)
• Output Impedance: 1000 Ω nominal
• Frequency Response: 200Hz to 8kHz +1/-3dB
• Connector Type: RCA Phono Jack

Expansion Input /Output

• Type: 2.0 mm stereo phone jack

Headphone Amplifier

• Voltage Gain: 30 ±3dB
• Maximum Output: 250mW ±10% into 150Ω, 65mW ±10% into 600Ω
• Frequency Response: 200Hz to 8kHz +1/-3db
• Incoming Call Beep Tone: 2kHz, at the headphones
• Total Harmonic Distortion: Less than 0.2% at 200mW
• Sidetone: 18 ±2dB, adjustable

PHYSICAL

• Dimensions: 1.75 in (44.5 mm) high, 19 in (483 mm) wide, 10.31 in (261.9 mm) deep
• Weight: approximately 4.5lb (2kg)
• Environmental Requirements:
  • Storage: -20°C to 80°C; 0% to 95% humidity, non-condensing
  • Operating: -0°C to 50°C; 0% to 95% humidity, non-condensing