ASL INTERCOM PS 280 Manual do utilizador - Página 7
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PARTY LINE, TECHNICAL CONCEPT
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 interconnected
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.
9.0 GUARANTEE
This unit is warranted by ASL Intercom to the original end-
user purchaser against defects in workmanship and
materials in it's manufacture for a period of one year from
the date of shipment to the end-user.
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:
AMPCO SOUND LAB BV, MAARSSEN (UTRECHT),
HOLLAND
6
10.0 TECHNICAL SPECIFICATIONS PS 280
POWER SUPPLY
mains voltage range
DC output voltage
riple and noise
max. output current
circuit-breaker delay time
automatic reset time
AUX INPUT
input impedance
nominal input level
max. input level
phantom power
DIMENSIONS AND WEIGHT
width
height
depth
weight
GENERAL SYSTEM SPECIFICATIONS
intercom line impedance
intercom line audio level
dynamic range
call send signal
call receive signal threshold
supply voltage
mic mute power interrupt time
Note: 0 dBu = 775 mV into open circuit.
ASL reserve the right to alter specifications without further
notice.
User Manual PS 280 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.
115 V units: 100 - 125 V 60Hz AC
230 V units: 210 - 250 V 50Hz AC
+30 V +/-5% DC
< 11 mV rms
1.7 A continuous, 3 A peak
30 Kohms (balanced line level)
4.6 Kohms (balanced mic level)
-18 dBu to +6 dBu (line level)
-38 dBu to -14 dBu (mic level)
+22 dBu (line level)
+2 dBu (mic level)
+30 V DC (mic level selected)
19" (483 mm)
1U (44.5 mm)
150 mm
350 ohms (1kHz)
2.2 Kohms (DC)
nom. -18 dBu
max. +4 dBu
+2.8 mA
+2.4 V DC
+30 V DC (12 V to 32 V)
0.2 sec.
3.0 sec.
2.55 Kg
80 dB
0.1 sec