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Intercom User Station US2002 - 35
Intercom Channels, Balanced Mode (SW2 set to BAL position)
Output Level: 1 Vrms nominal
Input Impedance: 300 ohms
Bridging Impedance: greater than 10,000 ohms
Sidetone: -40 dB, 35 dB adjustable range
Call Signaling:
Send: 20 kHz ±100 Hz, 0.5 Vrms ±10%
Receive: 20 kHz ±800 Hz, 100 mVrms
Mic-Kill Frequency:
Send: 24 kHz ±300 Hz, 0.5 Vrms ±10%
Detect: 24 kHz ±800 Hz, 100 mVrms
Noise Contribution: less than -70 dB
Common Mode Rejection Ratio: greater than 50 dB
Connector Type: One XLR-3M and XLR-3F pair, wired in parallel, for each channel
Pin 1 Common
Pin 2 Intercom audio low and +24 VDC input
Pin 3 Intercom audio high and +24 VDC input
Intercom Channel, Unbalanced Mode (SW2 set to UNBAL position)
Output Level: 1 Vrms ±10%
Input Impedance: 150 ohms
Bridging Impedance: greater than 10,000 ohms
Call Signaling:
Send: 11 ±3 VDC
Receive: 4 VDC minimum
Connector Type: One XLR-3M and XLR-3F pair, wired in parallel, for each channel
Pin 1 Common
Pin 2 +24 VDC input
Pin 3 Intercom audio high
PA Output
Output Level: 235 mVrms nominal
Connector Type: 1/8-inch Stereo Phone Jack
Tip: PA output high
Ring: Not used
Sleeve: Common
Speaker Output
Output Level: 0 dB nominal (1.0 Vrms)
Output Impedance: 1000 ohms nominal
Frequency Response: 200 Hz to 8 kHz +1/-3dB
Connector Type: RCA Phono Jack
Tip: Speaker output high
Sleeve: Common
Expansion Input /Output
Type: 2.0 mm stereo phone jack
Tip: Talk output
Ring: Listen input
Sleeve: Common