Clear-Com MS702
Main Intercom Station 2 Channel, Power Supply

The MS-702 is a one-rack-space, two-channel main station with a regulated 1.2-amp "fail-safe" power supply, individual channel short-circuit protection, and a versatile intercom monitoring system. It supports two intercom channels with up to 40 beltpacks or 10 speaker stations. It features Clear-Com's excellent speech intelligibility in both high- and low-noise environments.

Monitoring System
The MS-702 can monitor intercom activity on one or both channels with individual listen-level controls. Monitoring intercom activity is possible through a headset or the internal loudspeaker. The high-sensitivity internal speaker provides intelligible communication in the typical active production environment.

Talk Selection
The MS-702 contains mic preamps with limiters, and speech-shaping circuits for enhanced intelligibility. An individual electronic momentary/latching talk button is provided for each channel. These buttons light dimly when latched - blue-color LED while in stand-by and amber-color LED when latched. The channels may be accessed separately or simultaneously without tying them together. An optional gooseneck mic is available.

Announce Output
For paging applications, the MS-702 provides a balanced, line-level output signal to a 1/4" TRS connector on the rear panel. The front panel "Announce" button activates the output and the Announce relay. The relay circuit, on a separate 1/4" TRS connector, is typically used to mute control-room monitors during live announcements.

Visual and Audible Signaling
Visual "call" signaling attracts the attention of operators who have removed their headsets or turned off their speakers. Call buttons for each channel signal all stations on that party line by flashing brightly. Along with the visual signal, the station's speaker will emit an audible signal if the remote station operator holds the Call button for more than 2 seconds.

Remote Mic Kill (RMK)
The MS-702 is equipped with a global RMK button. It will turn off the microphone talk circuits of all Clear-Com beltpacks in the system, eliminating extraneous noise from the "open" headset microphones.

Program Input
The MS-702 accepts a line-level external program input for monitoring in the headset and speaker, and/or mixing with intercom audio on either or both channels. When Interrupt is selected, the program signal is interrupted when the Talk button is pressed.

Power Supply & System Protection
The MS-702 provides visual indication of power supply conditions. In the event of a short circuit or current overload on a channel, that channel will shut down while the other one continues to operate. As soon as the fault condition is removed, the "auto-reset" circuitry will restore power to that channel - even under full load conditions.

Simple Set-Up
The MS-702 connects to remote stations with standard, two-conductor shielded mic cable. User-selectable setup dip switches are provided on the rear panel.

Features

• Supports up to 40 beltpacks or 10 speaker stations on two channels and 12 headsets
• Separate short-circuit protection for each channel
• Dual-action electronic momentary/latching "talk" buttons
• Program feed to both channels, with selectable "Program Interrupt" (IFB)
• "Call" signal buttons for each channel
• Global "Remote Mic Kill"
• Announce output with relay
• Microphone limiting
• Volume controls for each channel
• Visual and audible "Tone Alert" signaling
• Channels A & B "Link" switch
• Built-in speaker
• Optional gooseneck mic
• External switchable line termination on each channel
• Universal voltage power supply for 100-240 VAC operation

Specifications

• Panel Microphone Input
  Input Type: Electret
  Input Impedance: >=2kohm
  Mic Limiter Threshold: 0dBu +/-3dB
  Mic Limiter Range: >=20dB
• Headset Microphone Input
  Input Type: Dyanmic
  Input Impedance:>=1k ohm
  Mic Limiter Threshold: 0dBu +/-3dB
  Mic Limiter Range: >=15dB
• Program Line Input
  Maximum Level before Clipping: >=20dBu
  Input Impedance: >=5k ohm
• Headset Output
  Load Impedance: >=8 ohms
  Output Impedance: <=25ohms
  Output Limiter Threshold: +5dBu +/-3dB
  Maximum Output Level before Distortion: >=17 dBu
• Speaker Output
  Load Impedance: >=4 ohms
  Max Output Level before 1% Distortion: 20dBu +/-2dBu
• Party Line Output
  Off Noise: <-74dBu
  Output Impedance: >10k ohms
• Party Line Input
  Crosstalk: <-60dB
  Max level before Clipping:>=12dBu
  Sidetone Null Capability: >25dB
• Stage Announce/Balanced Line Out
  Type: Balanced
  Output Impedance:>=200 ohms
  Load Impedance: >=600 ohms
• IFB/Hot Mic
  Type: Unbalanced
  Output Impedance: 180 ohms
  Load Impedance: >=600 ohms
• Frequency Response
  Panel Mic - Party Line: 600-10kHz +/-3dB
  HeadsetMic - Party Line: 200-12kHz +/-3dB
  Headset Mic - Line Out: 200-12kHz+/-3dB
  Program Input - Party Line: 100-17kHz +/-3dB
  Program Input -Headset Out: 200-10kHz +/-3dB
  Program Input - Speaker Out: 300-10kHz+/-3dB
  Party Line - Headset Out: 200-10kHz +/-3dB
  Party Line - Speaker Out: 300-10kHz +/-3dB
• Max Distortion
  Panel Mic - Party Line: <=0.5%
  Headset Mic - PartyLine: <=0.5%
  Headset Mic - Line Out: <=0.5%
  Program Input - PartyLine: <= 0.2%
  Program Input - Headset Out: <= 0.2%
  Program Input -Speaker Out: <= 0.5%
  Party Line - Headset Out: <= 0.2%
  Party Line - Speaker Out: <= 0.5%
• Noise
  Panel Mic - Party Line: < -65 dBu
  Headset Mic - Party Line:< -70 dBu
  Headset Mic - Line Out: < -55 dBu
  Program Input - PartyLine: < -85 dBu
  Program Input - Headset Out: < -60 dBu
  ProgramInput - Speaker Out: < -60 dBu
  Party Line - Headset Out: < -50dBu
  Party Line - Speaker Out: < -50 dBu
• Max Gain
  Panel Mic - Party Line: >= 37 dB
  Headset Mic - PartyLine: 41 dB ± 2 dB
  Headset Mic - Hot Mic Out: 55 dB ± 3 dB
  Headset Mic -Announce Out: 55 dB ± 3 dB
  Program Input - Party Line: >= -16dB
  Program Input - Headset Out: >= 18 dB
  Program Input - Speaker Out:>= 24 dB
  Party Line - Headset Out: >= 34 dB
  Party Line - Speaker Out: >= 40 dB
• Min Gain
  Panel Mic - Party Line” <= 25 dB
• Mains Power
  Input Voltage Range: 100 - 240 VAC
  Input FrequencyRange: 50 - 60 Hz
  Input Power: <= 60 VAC
  Output Voltage: 30 VDC ±0.5V
  Output Current per Channel (Continuous): 1.2 A
  Output Current perChannel (Peak): 2 A (Do not exceed the 1.2A rating for more than 2 seconds per1 minute period)
  Short Circuit Recovery Time (1st short): <= 0.5sec
  Short Circuit Recovery Time >= 20 shorts in 20sec: <= 20 sec
• Station Capacity: Up to 40 RS-601 beltpacks or 10 speaker stations or 12 headset stations distributed over both channels
• Rear Panel Connectors
  Intercom: (6) XLR-3M (3 per channel)
  AnnounceOut: (1) XLR-3M (audio)
  Announce Relay: (1) 1/4 in. (0.64 cm) phone jack(relay)
  Program: (1) XLR-3F
  Hot Mic / IFB Interface: (1) 1/4 in. (0.64cm) phone jack
  AC Power: IEC 320 connector
• Rear Panel Controls
  (2) Termination On-Off switches
  (8) Optionswitches
  (1) Power switch
  (1) Tone alert volume control
• Front Panel Connectors
  Panel Mic: (1) 1/4 in. (0.64 cm) panel mountingjack
  Headset: (1) XLR-4M
• Front Panel Controls & Indicators
  (1) Panel / headset micswitch
  (1) Announce button
  (1) Party line link button
  (2) ProgramON-OFF-INTERRUPT switches
  (3) Program level controls
  (2) Listencontrols
  (2) Sidetone null controls
  (2) Talk buttons
  (2) Callbuttons
  (1) Tone alert button
  (1) RMK button
  (1) Speaker ON-OFFswitch
  (2) Short LEDs
• Environmental: 32 - 122°F
• Dimensions (W x H x D): 19" x 1.75" x 6.5"
• Weight: 6.06 lbs