MCE-325 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. Features 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 talk. 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 General 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 Connectors 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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