ASL INTERCOM PS 260T User Manual - Page 3

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1.0

GENERAL DESCRIPTION

The PS 260T is designed to interface the party
lines of the ASL intercom system to external
audio equipment or 4-wire communication
systems.
Applications may be:
•
temporarily extending a fixed installed
4-wire intercom system with a portable
ASL intercom set for use on location
•
connecting an ASL intercom system to a
(4-wire) camera CCU
•
injecting an external audio signal into an
ASL intercom party line
•
monitoring the audio of an ASL intercom
party line by external equipment such as
recorders or paging systems, etc.
The PS 260T includes two separate and identical
interface modules. Each interface has its Intercom
Line and its Audio Line connectors (input and
output), positioned on the rear of the PS 260T.
2.0

MECHANICAL INSTALLATION

To connect the PS 260T to an ASL party line
intercom system and to external audio equipment
or a 4-wire intercom system, use professional
flexible microphone cable with 2 wires and 1
shield only. The party line cables are to be
connected to the INTERCOM LINE connectors
on the rear of the PS 260T. The cables from/to
external audio equipment or of a 4-wire intercom
3.0

FRONT PANEL CONTROLS

The unit contains two identical interface modules. Each interface has the following front panel controls:
1
POWER LED indicator
This LED illuminates if line power is supplied by
an ASL separate power supply or an ASL master
station, via the intercom party line
2
INPUT LEVEL control knob
This knob controls the level of the audio input
signal before it is placed on the intercom line
3
OUTPUT LEVEL control knob
This knob controls the level of the intercom audio
signal appearing at the output connector
PAGE 3
User Manual PS 260T / October 2013 © ASL Intercom BV
..
The electronic circuitry of each interface is
powered by the 30V DC power supplied via the
intercom party line.
The unbalanced signal on the audio wire of the
ASL party line appears on the PS 260T audio
output connector after being converted to a
balanced signal. The signals brought to the audio
input connector are placed on the audio wire of
the intercom line connector.
Two-stage side tone trimmers avoid that audio
input signals appear at the audio output
connector. The input/output separation is better
than 30 dB from 200 Hz to 20 kHz. The built-in
test tone generator assists to adjust or check the
side tone levels.
The audio inputs and audio outputs of the PS
260T are transformer balanced.
system are to be connected to the AUDIO LINE
connectors (input & output), which are also on
the rear of the PS 260T. There are no separate
power connections to install since the necessary
DC voltages are derived from the ASL party line.
The PS 260T is fully protected against wiring
mistakes (reverse power) or short circuit in the
interconnecting cables.
4
SIDE TONE LEVEL trimmer
This trimmer controls the input/output separation
5
SIDE TONE HI trimmer
This trimmer controls the input/output separation
in the high frequency range
6
SIDE TONE TEST knob
This hidden push button activates a test tone
generator which adds a 200 Hz tone to the audio
input circuitry. This to assist adjusting or checking
the side tone trimmer settings.