RTS User Station MCE-325 Fascicule

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 four-

wire 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 is accomplished using an inaudible (20 kHz) 

signal to activate a call indicator LED.

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.

The MCE-325 may be programmed for voice activation of 

the microphone.

Program audio assigned to a channel is interrupted during 

talk.

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 inter-

rupt the program source and talk on the line.

The microphone preamplifier circuit contains a limiter, which 

helps to equalize voice levels.

Retains programming even when power is shut off.

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.