ASL INTERCOM BS 15 Руководство пользователя - Страница 5
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7.0
INTERNAL CONTROLS
MIC GAIN
The gain for the headset mic can be adjusted
internally by a trimmer. The trimmer is located on
the lower PCB board.
Open the BS 15 by removing the four
screws on the underside
To increase mic gain turn clockwise. To
decrease mic gain turn counterclockwise
8.0
TECHNICAL SPECIFICATIONS
General System Specifications
dynamic range: 80 dB (1 kHz, THD<1%)
call signal (send): +2.8 mA
call signal threshold (receive): +2.4 V DC
supply voltage: +30 V DC (12 - 32 V DC)
Intercom Line
line impedance: 350 Ω (1kHz), 2.2 kΩ (DC)
audio level: nom. -18 dBu, max. +4 dBu
Mic. Pre-amp
mic. Impedance: 200 ohms
gain: 40 dB - 60 dB (adjustable internally)
presence filter: +6 dB at 5 kHz
frequency response: 200 Hz - 15 kHz (-3 dB)
V electret mic: +9 V DC
Headphones Driver Amp
max. load: 200 ohms
max. output level: 10.6 Vrms @200 ohms
max. output power: 0.5 Wrms @ 200 ohms
9.0
PARTY LINE, TECHNICAL CONCEPT
User stations in an ASL intercom system are
connected via one or several 'party lines'.
A party line offers two way ('full duplex')
communication and consists of standard
microphone (multi-pair) cable. One wire is used as
an audio line, one as a power line and the screen of
the cable functions as earth/return.
Current drive is used for signal transfer. Each
station utilizes a current amplifier to amplify the
microphone signal and place it on the common
audio line where, due to the constant line
impedance (situated in the power supply between
XLR pin 3 and 1), a signal voltage is developed
which can be further amplified and sent to the
headphones.
PAGE 5
User Manual BS 15 / Issue 2011 © ASL Intercom BV
.
Side Tone
Rejection: 0 - 30dB adjustable
Buzzer
max. SPL: 85 dBA
Power Consumption BS 15
current (at 30 V DC) :
18 mA quiescent
35 mA signaling
80 mA at max. output + signaling
Dimensions & Weight
Width: 90 mm / Height: 38 mm
Depth: 124 mm / Weight: 260 grams
Note: 0dBu defined as 775 mV into open circuit
ASL reserves the right to alter specifications
without prior notice.
This principle has three advantages:
This principle has three advantages:
the use of a single audio line allows several
stations to talk and listen simultaneously.
due to the high bridging impedance offered
by each station, the number of stations 'on
line' has no influence on the level of the
communications signal.
power and audio to the intercom stations
use the same cable.
The Call signal is also sent as a current on the
audio line. It develops a DC potential over the line
impedance which will be sensed by each station
and interpreted as a Call signal.