ASL INTERCOM PS 130 Panduan Pengguna - Halaman 7

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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

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 130

POWER CONSUMPTION

current (at 30 V DC)

190 mA at max. output + signalling

MIC. PREAMP

gooseneck microphone type

headset mic. impedance

gain

40 dB - 70 dB (adjustable internally)

presence filter

frequency response

V electret mic

HEADPHONES DRIVER AMP

max. load

max. output level

max. output power

SPEAKER DRIVER AMP

speaker impedance

max. output power

INTERCOM LINE DRIVER

max. output current

output impedance

SIDETONE

rejection

BUZZER

max. SPL

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 reserves the right to alter specifications without further

notice.

35 mA quiescent

70 mA signalling

noise cancelling electret

200 ohms

+6 dB at 5 kHz

200 Hz - 13 kHz (-3 dB)

+9 V DC

200 ohms

14 V rms (200 ohms)

0.5 W rms (each can)

50 ohms

1.3 W rms

3 mA rms

> 150 Kohms

0 - 30dB adjustable

100 dBA

230 mm

88 mm

42/48 mm sloping

1.1 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)

0.1 sec