ASL INTERCOM PS 260 Panduan Pengguna - Halaman 7

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Halaman Cetak

1. Installation

8.0

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

10.0 TECHNICAL SPECIFICATIONS PS 260

INPUT AMPLIFIER

input impedance

input level

frequency response

INTERCOM LINE DRIVER

Max. output current

output impedance

OUTPUT AMPLIFIER

output impedance

maximum load

max. output level

frequency response

SIDETONE

rejection

DIMENSIONS AND WEIGHT

width

height

depth

weight

GENERAL SPECIFICATIONS

supply voltage

supply current

audio line level

signal-to-noise

station bridging impedance

Note: 0 dBu = 775 mV into open circuit.

ASL reserve the right to alter specifications without further

notice.

min. 10Kohm

+30 to - 10 dBm

60Hz - 20KHz (-3dB)

3mA rms

> 150 Kohm

< 25 ohms

600 ohms

+20 to -20 dBm

40 Hz - 20 Khz

min. 30 dB (20Hz - 20 Khz)

19" (483mm)

1U (44.5mm)

126mm

1565 grams

+30VDC (12V to 32V)

33 mA quiescent / each

-18dBm (max. 0dBm)

80dB

> 150 Kohm