Clear-com MS-704 Four Channel 2RU Main Station
Clear-com MS-704 is a 2RU four-channel main station
with programmable front panel buttons,
individual channel short-circuit
protection, individual channel volume control, and a regulated
fail-safe
power supply. The MS-704 supports up to 55 beltpacks or 10 speaker stations,
or 12
headset stations.
Monitoring System
The MS-704 accepts five separate program audio
sources: four line-level balances inputs and
one assignable line-level
input. The assignable program input accepts a balanced signal and is
designed for monitoring external audio. The four balanced program inputs can
be used to create individual program feeds on the intercom channels. The
MS-704 can monitor intercom activity on one or all four channels with
individual volume level controls. Monitoring intercom activity is possible
through a headset or the internal high-sensitivity loudspeaker.
Talk Selection
The MS-704 has mic pre-amps with limiters and
speech-shaping circuits. An individual
electronic momentary/latching Talk
button is available for each channel. Illuminated
dual-action Talk
buttons light an LED dimly when latched: blue-color while in standby,
ambercolor when latched. The latching feature can be disabled. The channels
can be accessed separately or simultaneously without tying them together. A
selector switch toggles between the headset or microphone. The Talk buttons
can also be controlled with a footswitch.
Announce Output
For paging, the MS-704
provides a balanced, line-level output signal to a ¼-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 ¼-inch TRS connector, is
typically used to mute monitors.
Call Signaling
The MS-704 has individual Call buttons with visual
call signaling for each channel on the
partyline. The visual signal will
flash brightly and will emit an audible signal if the remote station
operator holds the Call button for more than 2 seconds. The call signaling
feature can be programmed to the Talk buttons.
Remote Mic Kill (RMK)
The MS-704 has a global Remote Mic Kill button that
will turn on the microphone talk circuits of all beltpacks on the system,
eliminating extraneous noise from the open headset microphones.
Program Input and Interrupt (IFB)
The MS-704 accepts a line-level external program
input for monitoring in the headset and speaker, and/or mixing with intercom
audio on up to three of the four channels. When Interrupt is selected, the
program signal is interrupted when the Talk button is pressed.
Configuration Panel
The MS-704 has a removable front panel for easy
access to the station’s configuration switches and trim pots. Clearly
labeled and easy to adjust, these controls allow the MS-704 to be configured
quickly. When configuration is complete, the front panel can be reattached
so it
shows only the needed controls.
Power
The MS-702 has a 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.
