Overview

RTS' 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 four-wire lines.

Features

• 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.
• 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.

Specifications

• Bridging Impedance (to line): 10,000 ohm typical
• Noise Contribution to 200 ohm 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 ohms
• 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 ohms
• Output Power 150 mW into 50 ohms
• 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 ohm
• Output Power per Amplifier: 5W into 8 ohms
• Output Voltage Level: 16 Vp-p