RTS MCE-325 User Manual

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User Station

The MCE-325is afour-channel,programmable intercom station. It may be used as a headset station or, with the addition of theMCS-325Modular Speaker, as a speaker station. It may be mounted in a console or equipment rack via optional mounting kits. TheMCE-325can be used with eithertwo-wireorfour-wireintercom lines, or a combination of both. In the labeling on theMCE-325,references to channels 1, 2, 3, and 4 indicatetwo-wirelines; references tofour-wireA andfour-wireB indicate fourwire lines. TheMCE-325can be interfaced to a variety of external devices including external program sources,two-wayradios, 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-325can send and receive“talk-off”signals.

VOX circuit

The MCE-325may be programmed for voice activation of the microphone.

Simple IFB

Program audio assigned to a channel is interrupted during talk.

External device keying

External devices, such as two-wayradios, 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 ofMCE-325stations 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.

Line Drawing



Bridging Impedance (to line) 10,000 Ω typical

Noise Contribution to 200 Ω Line -90dBu

Call Signal Frequency 20 kHz, crystal controlled

Talk-offFrequency 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-plasticfront panel, aluminum case, light gray finish


Intercom Line Connector XLR type, 3-pin(male-femaleloop through ontwo-wire

Channel 1 and 2, or four-wirechannel A; Female only ontwo-wirechannel 3 and 4, orfour-wirechannel B Dynamic Mic XLR type,6-pinfemale

Carbon Mic ¼-inchphone jack,3-circuitAuxiliary Connector25-pin,female,D-SubProgram Inputs¼-inchphone jack,3-circuitSpeaker Output¼-inchphone jack,3-circuit

Panel Mic ¼-inchphone jack, metal busing,3-circuit

Contact Information

Ordering Information

Telex Communications, Inc.


MCE-325 A5F • 2 or 4 channel user programmable


12000 Portland Avenue South

modular user station • Catalog Number: 9000646400

Burnsville, Minnesota 55337

MCE-325 A4F • 2 or 4 channel user programmable

Telephone: (800) 392-0498

modular user station with A4M headset connector, UL

Fax: (800) 323-0498

approved • Catalog Number: 9000646401

Form Number: 38110-342

This specifications information is preliminary and is subject to change without notification.

Date: March, 2006



Brand names mentioned are the property of their respective companies.