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8.0

PARTY LINE, TECHNICAL CONCEPT

ASL's BASIC 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

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 the

headphones.

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

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 BV

MAARSSEN (UTRECHT) HOLLAND.

Tel. +31 30 241 1901, Fax +31 30 241 0638

10.0 TECHNICAL SPECIFICATIONS BS 181

POWER SUPPLY

mains voltage range

DC output voltage

ripple and noise

max. output current

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

Note: 0 dBu = 775 mV into open circuit.

ASL reserves the right to alter specifications without further

notice.

all units: 90 -240 V 50/60Hz AC

+30 V +/-5% DC

< 11 mV rms

1,8 A continuous / 2,3 A peak

176 mm

42 mm

139 mm

0.9 Kg

350 ohms (1kHz)

2.2 Kohms (DC)

nom. -18 dBu

max. +4 dBu

80 dB

2.8 mA

+2.4 V DC

+30 V DC (12 V to 32 V)