Telex AUDIOCOM BP-2002 - Manual (Page 5)

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EXTERNAL CONNECTIONS & CONTROLS
NOTE: The numbers refer to the callouts in Figure 1.
1. V OLUME C ONTROL : Use this control to adjust the headset listen level.
2. C HAN B UTTON AND I NDICATORS : The Chan button (only on the BP-2002) allows the
user to select which intercom channel is active. Press the Chan button to
change the channel selection. The yellow indicator next to the channel number
lights to show the active channel.
3. C ALL B UTTON AND I NDICATOR : The Call function allows the user to send or receive
signals to other devices on the intercom channel selected. The Call button
operates in two ways:
Call receive : When there is an incoming call signal, the indicator is red.
(If Audible Call Alert is enabled, incoming calls will cause beeps in the
headset.) On the BP-2002, calls can be received on the selected
channel only.
Call send : To send a call signal to all stations on a channel, press and
hold the Call button until a verbal response is received. The indicator will
glow red. On the BP-2002, calls can be sent on the selected channel
only.
4. T ALK B UTTON AND I NDICATOR : The Talk button activates the headset microphone
and operates in two ways:
Latched Mode:
Tap the button once to talk. The indicator will glow green. Tap the button
again when finished with a conversation.
Momentary Mode:
Press and hold the button to talk momentarily. Release
the button when
finished talking.
NOTE: On the BP-2002, if no headset is connected when the Talk button is
pressed, the Talk button will have the same function as the Chan button.
5. S IDETONE C ONTROL : When using a headset, this control adjusts your own voice
level heard in the headphones. To adjust the level, tap the Talk button once to
turn on the headset microphone. Then, use a small flat-blade screwdriver to
increase or decrease your voice level while talking into the microphone. (This
control is accessible by removing one screw in the belt clip.)
6. H EADSET C ONNECTOR : This connector accepts a four-wire Telex ® boom-
microphone headset.
SPECIFICATIONS
GENERAL:
Power Requirements:
Channel supplied: 24 VDC nominal, 40 to 100 mA
Local-power: 24 VDC nominal (21 to 30 VDC), 40 to 100 mA
Environmental Requirements:
Storage: -20ºC to 80ºC; 0% to 95% humidity, non-condensing
Operating: -15ºC to 60ºC; 0% to 95% humidity, non-condensing
Dimensions: 5.0" (127 mm) H x 3.5" (88.9 mm) W x 1.8" (45.7 mm) D
Weight: 1.5 pounds (0.68 kg)
INTERFACE REQUIREMENTS:
Headset:
1000 - 3000 ohm electret microphone
50 - 200 ohm dynamic microphone
150 to 600 ohm headphones
Input Level:
4 mV RMS (nominal)
Balanced Intercom Channel:
Output Level: 1 V RMS nominal
Terminating Impedance: 300 ohm ±5%
Bridging Impedance: greater than 10,000 ohm
Call Signalling:
Send: 20 kHz ±100 Hz, 500 mV RMS ±10%
Receive: 20 kHz ±800 Hz, 100 mV RMS
Mic-Off Frequency:
Detect: 24 kHz ±800 Hz, 100 mV RMS
Noise Contribution: less than -60 dBu on the line
Total Harmonic Distotion: less than 1% at channel output for normal input
Unbalanced Intercom Channel:
Output Level: 775mV RMS ±10%
Terminating Impedance: 200 ohm ±5%
Bridging Impedance: greater than 10,000 ohm
Call Signalling:
Send: 12 ±3 VDC on the line
Receive: 4 - 15 VDC from the line
Total Harmonic Distotion: less than 1% at channel output for normal input
HEADPHONE AMPLIFIER:
Maximum Output:
4.5 ±10% V RMS into 150 Ω headset
Frequency Response:
200 Hz to 8 kHz ±2 dB
Audible Alert:
1 kHz, at the headset
Total Harmonic Distortion:
Less than 1% at less than 3.5 V RMS into 150 Ω headset
Sidetone:
20 ±3 dB minimum range, adjustable