RTS Two-Wire Intercom MCE-325 Technical Data Sheet

RTS Two-Wire Intercom MCE-325 Technical Data Sheet
User Station
The MCE-325 is a four-channel, programmable intercom station. It may be used as a headset station or, with the addition of
the MCS-325 Modular Speaker, as a speaker station. It may be mounted in a console or equipment rack via optional mounting
kits. The MCE-325 can be used with either two-wire or four-wire intercom lines, or a combination of both. In the labeling on the
MCE-325, references to channels 1, 2, 3, and 4 indicate two-wire lines; references to four-wire A and four-wire B indicate fourwire lines. The MCE-325 can be interfaced to a variety of external devices including external program sources, two-way radios,
paging systems, and satellite circuits.
Call Signaling
Call signaling is accomplished using an inaudible (20 kHz)
signal to activate a call indicator LED.
Remote “talk-off”
Active, unattended remote station microphones may be
deactivated by momentarily injecting an inaudible (24 kHz)
signal into the corresponding intercom line. The MCE-325
can send and receive “talk-off” signals.
VOX circuit
The MCE-325 may be programmed for voice activation of
the microphone.
Simple IFB
Program audio assigned to a channel is interrupted during
Line Drawing
External device keying
External devices, such as two-way radios, speaker mute
relays, or paging systems may be activated through key
outputs at the auxiliary connector on the rear panel. The key
outputs may also be used to expand the simple IFB function,
allowing any one of a number of MCE-325 stations to interrupt the program source and talk on the line.
Microphone Limiter
The microphone preamplifier circuit contains a limiter, which
helps to equalize voice levels.
Fully programmable
Retains programming even when power is shut off.
Instantaneous Auto-Reset
Instantaneous Auto Reset (IAR), the newest technology in
performance and safety, which uses a revolutionary new
circuitry that dynamically monitors line fault conditions. Then,
when the fault is removed, automatically brings individual
power supply channels up.
MCE-325 Specifications
Bridging Impedance (to line) 10,000 Ω typical
Noise Contribution to 200 Ω Line -90 dBu
Call Signal Frequency 20 kHz, crystal controlled
Talk-off Frequency 24 kHz, crystal controlled
Microphone Preamplifier
Maximum Voltage Gain 54 dB
Frequency Response 100 Hz to 8,000 Hz, ±3 dB
Input Impedance 1,000 Ω
Limiter Range 30 dB
Headphone Amplifier
Maximum Voltage Gain 30 dB
Frequency Response 100 Hz to 8,000 Hz, ±3 dB
Headphone Impedance 50 to 600 Ω
Output Power 150 mW into 50 Ω
Output Voltage Level 8 Vp-p
Speaker Amplifier
Maximum Voltage Gain 30 dB
Frequency Response 100 Hz to 8,000 Hz, ±3 dB
Speaker Impedance 8 to 16 Ω
Output Power per Amplifier 5W into 8 Ω
Output Voltage Level 16 Vp-p
Power and Mechanical
Power Requirements 115 or 230 VAC, 20 VA max version available
12 to 25 VDC, 100 to 125 mA quiescent, 900 mA max
Dimensions 1.72” (44 mm) tall, 8.2” (208 mm) wide, 8” (203 mm) deep
Weight 4.5 lbs (1.93kg)
Material/Finish Thermo-plastic front panel, aluminum case, light gray finish
Intercom Line Connector XLR type, 3-pin (male-female loop through on two-wire
Channel 1 and 2, or four-wire channel A; Female only on two-wire channel 3 and 4, or four-wire channel B
Dynamic Mic XLR type, 6-pin female
Carbon Mic ¼-inch phone jack, 3-circuit
Auxiliary Connector 25-pin, female, D-Sub
Program Inputs ¼-inch phone jack, 3-circuit
Speaker Output ¼-inch phone jack, 3-circuit
Panel Mic ¼-inch phone jack, metal busing, 3-circuit
Contact Information
Telex Communications, Inc.
12000 Portland Avenue South
Burnsville, Minnesota 55337
Telephone: (800) 392-0498
Fax: (800) 323-0498
Ordering Information
MCE-325 A5F • 2 or 4 channel user programmable
modular user station • Catalog Number: 9000646400
MCE-325 A4F • 2 or 4 channel user programmable
modular user station with A4M headset connector, UL
approved • Catalog Number: 9000646401
Form Number: 38110-342
Date: March, 2006
This specifications information is preliminary and is subject to change without notification.
Brand names mentioned are the property of their respective companies.
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