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The CM-300L Console Mount User Station w/ an A4F Headset Connector from Telex is a two-channel select console mount user station. The user station is designed to be used in a full duplex, conference line intercom system.
It features a microphone limiter circuit, separate dynamic and carbon microphone inputs and silent channel-select switching. In normal system operation, one or more users talk and the others listen. A microphone switch on each station allows the talker's microphone to be enabled and allows the listeners to keep their microphones disabled.
The unit is housed in a solid metal front cabinet and the back is open for console mounting. The CM-300L uses the MCP-3 mounting kit.
The volume control on the CM-300L has a wide range to compensate for: user hearing differences, ambient noise variation, variations in headset / handset sensitivity, and variations in voice. The volume control in the CM-300L reduces distortion by driving the headphone amplifier only as much as needed
In normal system operation, one or more users talk and the others listen. A microphone switch on each station allows the talker's microphone to be enabled and allows the listeners to keep their microphones disabled. In this condition, speech intelligibility is enhanced since background noise from other microphones is not present. On the Model CM-300L, a toggle switch turns the microphone on
Channel Select Switch
A channel selector switch allows a choice of two (optionally three) channels. When the switch is on the "1" position the station talks and listens on channel 1, on the "2" position, to channel 2
Call Light Push Button
Pushing this button transmits a call signal to all other units on the channel selected by the channel selector switch. A call signal on this channel will cause the call light push button to flash. The flash rate is 2 to 5 times a second. The call signal itself is a 20kHz signal
In the Box
Telex CM-300L Console Mount User Station w/ an A4F Headset Connector
Table of Contents
TW mode: 18-35 V DC LP option: 15-35 V DC Battery: 12-35 V DC (reduced performance)
Temperature Operating: 32-140°F (0-60°C) Storage: -40-185°F (-40-85°C) Humidity Operating and storage: 5-95% non-condensing
One unit: -75 dBu Ten units: -67 dBu
Panel Microphone Preamp
Microphone preamplifier Input impedance: 470 Ω/dynamic mic Source impedance: 200 Ω, nominal Maximum input level: 150 millivolts Frequency response: 100Hz-10kHz ±3 dB (-54 dBu input) Limiter range: 30 dB Carbon mic excitation current: 10 millliamperes, nominal
Current source Transfer ratio: 3.3 milliamperes/volt=3.3 millisiemens Output: ±5 milliamperes into 200 Ω = ±1 volt peak, nominal
Voltage gain: 34 dB Output voltage: 8 volts peak-to-peak into 25 ½ Output power: ½ watt peak into 25 Ω Frequency response: 150Hz-8kHz ±3dB Headphone impedance range: 25-600 Ω (600-2000 with reduced levels) Note: Do not use headphones with impedance less than 25 Ω. Sidetone adjustment range: -20dB to full on