Telex BP-1002 - Manual (Page 14)

10 Operation
Specifications
General
Power Requirements:
Channel Supplied: 24VDC nominal, 40 to 100mA
Local Power: 24VDC nominal (21 to 30VDC), 40 to 100mA
Environmental Requirements:
Storage: -20°C to 80°C; 0% to 95% humidity, non-condensing
Operating: -15°C to 60°C; 0% to 95% humidity, non-condensing
Dimensions: 5.0” (127mm) H x 3.5” (88.9mm) W x 1.8” (45.7mm) D
Weight: 13oz. (0.4kg)
Interface Requirements
Headset:
1000-3000 Ohm electret microphone
50-200 Ohm dynamic microphone
150-600 Ohm headphones
Input Level:
4mV RMS (nominal)
Balanced Intercom Channel:
Output Level: 1 V RMS nominal
Terminating Impedance: 300 Ohm ±10%
Bridging Impedance: greater than 10,000 Ohm
Call Signaling
Send: 20kHz ±100Hz, 500mV RMS ±10%
Receive: 20kHz ±800Hz, 100mV RMS
Mic-Off Frequency
Detect: 24kHz ±800Hz, 100mV RMS
Noise Contribution: less than -60dBu on the line
Total Harmonic Distortion: less than 1% at channel output for normal input
Unbalanced Intercom Channel:
Output Level: 775mV RMS ±10%
Terminating Impedance: 200 Ohm ±10%
Bridging Impedance: greater than 10,000 Ohm
Call Signaling
Send: 12 ±3VDC on the line
Receive: 4 -15VDC from the line
Total Harmonic Distortion: less than 1% at channel output for normal input
Headphone Amplifier
Maximum Output:
4.5 ±10% Vrms into 150
Ω headset
Frequency Response:
200Hz to 8kHz ±2dB
Audible Alert:
1kHz, at the headset
Total Harmonic Distortion:
Less than 1% at less than 3.5V RMS into 150 Ω headset
Sidetone:
17dB minimum range, adjustable