POWER SUPPLY
Mains voltage 100 - 240 V AC 50/60 Hz (auto select)
DC output voltage +30V +/- 2% DC
Max. output current 2.5A continuous / 3.5A peak
Circuit breaker delay time 0.2 sec
Automatic reset time 3.0 sec
MIC. PREAMP
gooseneck microphone type noise cancelling electret
headset 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
Limiter range (gooseneck mic) 30 dB
HEADPHONES DRIVER AMP
max. load 100 ohms
max. output level normal 17 V rms (200 ohms)
binaural 2 x 8.5V rms (400 ohms)
max. output power normal 1 W rms (200 ohms)
binaural 2 x 0.2 W rms (400 ohms)
SPEAKER DRIVER AMP
speaker impedance 25 ohms
max. output power 2.9 W rms
PROGRAM INPUT
Input impedance 47 Kohms
Nominal input level -12dbu to + 6 dBu
Max. input level + 16 dBu
AUX INPUT
Input impedance 11 Kohms
Gain 0 dB (line level)
Nominal input level -20 dBu to + 10 dBu (line level)
Max. input level +21 dBu (line level)
INTERCOM LINE DRIVER
max. output current 3 mA rms
output impedance > 150 Kohms
SIDETONE
rejection 0 30dB adjustable
BUZZER
max. SPL 100 dBA
DIMENSIONS AND WEIGHT
Width / Height/ Depth 420 x 88 x 180 mm
weight 4,200 Kg
GENERAL SYSTEM SPECIFICATIONS
intercom line impedance 350 ohms (1kHz)
2.2Kohms (DC)
intercom line audio level nom. 18 dBu max. +4 dBu
dynamic range 80 dB
call sent signal +2.8 mA
call receive signal threshold +2.4 V DC
supply voltage +30 V DC (12 V to 32 V)
mic mute power interrupt time 0.1 sec
Note: 0 dBu = 775 mV into open circuit
ASL reserve the right to alter specifications without
further notice.
This unit is warranted by ASL Intercom against defects
in materials and workmanship for a period of two years
from date of purchase.
Faults arising from misuse, unauthorised modifications
or accidents are not covered by this warranty. If the
unit is faulty it should be sent in it's original packing, to
the supplier or your local ASL dealer, with shipping
prepaid. A note must be included stating the faults
found and a copy of the original suppliers invoice.
THIS PRODUCT WAS DESIGNED, DEVELOPED
AND MANUFACTURED BY:
ASL INTERCOM BV
UTRECHT, THE NETHERLANDS.
Website: http://www.asl-inter.com
11.0 PARTY LINE, TECHNICAL CONCEPT
12.0 WARRANTY
13.0 TECHNICAL SPECIFICATIONS
ASL's PRO Series offers a complete two way ('full
duplex') communications system.
Users of the system are connected via a 'party line'.
Master stations (with built-in power supply), beltpacks,
speaker stations and power supplies are inter-
connected via standard microphone 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
utilises 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 headphones or loudspeakers.
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.
User Manual PS 4379 - Issue 1 © 2007 ASL Intercom, Utrecht, The Netherlands 17
(11 pages)
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