Clear-Com MS-702 Datasheet

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-inch 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-inch 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.

Clear-Com Encore

TM

MS-702 Two-Channel Main Station

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.

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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

MS-702 Front Panel

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Americas & Asia 850 Marina Village Parkway, Alameda, CA 94501 USA Tel: [phone]
Europe, Middle East & Africa 7400 Beach Drive, Cambridge Research Park, Cambridge, UK Tel: [phone]

© 2007, Vitec Group Communications, LLC. All rights reserved. ® Clear-Com is a registered trade mark of The Vitec Group plc.

Clear-Com Encore

TM

MS-702 Two-Channel Main Station

Technical Specifications:

dBu is an absolute measurement. 0 dBu is
referenced to 0.775 volts RMS

Panel Microphone Input

Input Type: Electret
Input Impedance: >=2KΩ
Mic Limiter Threshold: 0 dBu ±3 dB
Mic Limiter Range: >= 20 dB

Headset Microphone Input

Input Type: Dynamic
Input Impedance: >= 1KΩ
Mic Limiter Threshold: 0 dBu ± 3dB
Mic Limiter Range: >= 15 dB

Program Line Input

Maximum Level
before Clipping: >= 20 dBu
Input Impedance: >= 5KΩ

Headset Output

Load Impedance: >= 8Ω
Output Impedance: <= 25Ω
Output Limiter Threshold: +5 dBu ± 3 dB
Maximum Output Level
before Distortion: >= 17 dBu

Speaker Output

Load ImpedancE: >= 4Ω
Max Output Level before
1% Distortion: 20 dBu ± 2 dBu

Party Line Output

Off Noise: < -74 dBu
Output Impedance: >10 KΩ

Party Line Input

Crosstalk: < -60 dB
Max level before Clipping: >= 12 dBu
Sidetone Null Capability: > 25 dB

Stage Announce/Balanced Line Out

Type: Balanced
Output Impedance: >= 200Ω
Load Impedance: >= 600Ω

IFB/Hot Mic

Type : Unbalanced
Output Impedance: 180Ω
Load Impedance: >= 600Ω

Frequency Response

Panel Mic - Party Line: 600 - 10KHz ± 3dB
Headset Mic - Party Line: 200 - 12KHz ± 3 dB
Headset Mic - Line Out: 200 - 12KHz ± 3 dB
Program Input - Party Line: 100 17KHz ± 3 dB
Program Input

- Headset Out: 200 - 10KHz ± 3 dB
Program Input

- Speaker Out: 300 - 10KHz ± 3 dB
Party Line - Headset Out: 200 - 10KHz ± 3 dB
Party Line - Speaker Out: 300 - 10KHz ± 3 dB

Max Distortion

Panel Mic - Party Line: <= 0.5%
Headset Mic - Party Line: <= 0.5%
Headset Mic - Line Out: <= 0.5%
Program Input - Party Line: <= 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 - Party Line: < -85 dBu
Program Input - Headset Out: < -60 dBu
Program Input - Speaker Out: < -60 dBu
Party Line - Headset Out: < -50 dBu
Party Line - Speaker Out: < -50 dBu

Max Gain

Panel Mic - Party Line: >= 37 dB
Headset Mic - Party Line: 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: >= -16 dB
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 Frequency Range: 50 - 60 Hz
Input Power: <= 60 VAC
Output Voltage : 30 VDC ± 0.5V
Output Current per Channel

(Continuous): 1.2 A
Output Current per Channel
(Peak): 2 A (Do not exceed

the 1.2A rating for
more than 2 seconds

per 1 minute period)
Short Circuit Recovery
Time (1st short): <= 0.5 sec
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)
Announce Out: (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. (0.64 cm)

phone jack
AC Power: IEC 320 connector

Rear Panel Controls

(2) Termination On-Off switches
(8) Option switches
(1) Power switch
(1) Tone alert volume control

Front Panel Connectors

Panel Mic: (1) 1/4 in. (0.64 cm)

panel mounting jack
Headset: (1) XLR-4M

Front Panel Controls & Indicators

(1) Panel / headset mic switch
(1) Announce button
(1) Party line link button
(2) Program
ON-OFF-INTERRUPT switches
(3) Program level controls
(2) Listen controls
(2) Sidetone null controls
(2) Talk buttons
(2) Call buttons
(1) Tone alert button
(1) RMK button
(1) Speaker ON-OFF switch
(2) Short LEDs

Environmental

32 - 122˚F (0 - 50˚C)

Dimensions

19 in. W x 1.75 in. H x 6.5 in. D
(483 mm x 44 mm x 165 mm)

Weight

6.06 lbs. (2.75 kg)

Notice About Specifications

While Clear-Com makes every attempt to maintain the
accuracy of the information contained in its product
manuals, that information is subject to change without
notice. Performance specifications included in this manual
are design-center specifications and are included for
customer guidance and to facilitate system installation.
Actual operating performance may vary.

MS-702 Back Panel

MS-702