User manual

User Manual PS 630 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.
10
8.0 PARTY LINE, TECHNICAL CONCEPT 10.0 TECHNICAL SPECIFICATIONS PS 630
ASL's PRO Series offers a complete two way ('full POWER CONSUMPTION
duplex') communications system. current (at 30 V DC) 105 mA quiescent
Users of the system are connected via a 'party line'. 140 mA signalling
Master stations (with built-in power supply), beltpacks, 280 mA at max. output + signalling
speaker stations and power supplies are
interconnected via standard microphone cable. One MIC. PREAMP
wire is used as an audio line, one as a power line and gooseneck microphone type noise cancelling electret
the screen of the cable functions as earth/return. headset mic. impedance 200 ohms
Current drive is used for signal transfer. Each station presence filter +6 dB at 5 kHz
utilises a current amplifier to amplify the microphone frequency response 200 Hz - 13 kHz (-3 dB)
signal and place it on the common audio line where, V electret mic +9 V DC
due to the constant line impedance (situated in the
power supply between XLR pin 3 and 1), a signal HEADPHONES DRIVER AMP
voltage is developed which can be further amplified max. load 200 ohms
and sent to headphones or loudspeakers. max. output level normal 14 V rms (200 ohms)
This principle has three advantages: max. output power normal 0.5 W rms (each can)
- the use of a single audio line allows several binaural 0.16 W rms (each can)
stations to talk and listen simultaneously.
- due to the high bridging impedance offered by SPEAKER DRIVER AMP
each station, the number of stations 'on line' has speaker impedance 50 ohms
no influence on the level of the communications max. output power 1.3 W rms
signal.
- power and audio to the intercom stations use the INTERCOM LINE DRIVER
same cable. max. output current 3 mA rms
The Call signal is also sent as a current on the audio
line. It develops a DC potential over the line impedance SIDETONE
which will be sensed by each station and interpreted rejection 0 - 30dB adjustable
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 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:
ASL-intercom
MAARSSEN (UTRECHT) HOLLAND.
E-mail : [e-mail]
Website : http://www.asl-inter.com
gain 40 dB - 70 dB (adjustable internally)
binaural 8 V rms (400 ohms)
output impedance > 150 Kohms
BUZZER
max. SPL 100 dBA
DIMENSIONS AND WEIGHT
width 337 mm
height 87 mm
depth 155 mm
weight 2.94 Kg
GENERAL SYSTEM SPECIFICATIONS
intercom line impedance 350 ohms (1kHz)
2.2 Kohms (DC)
intercom line audio level nom. -18 dBu
max. +4 dBu
dynamic range 80 dB
call send 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.