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User Manual PS 155 / October 2013 © ASL Intercom BV
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The PS 155 is designed to be a single channel
audio interface between simplex (‘push to talk’)
wireless intercom systems and ASL wired (party
line) intercom systems.
The unit is housed in a strong steel tabletop
case.
Located on the front panel are volume controls
(send and receive), side tone adjustment
trimmers, a test tone switch, VOX adjustment
trimmers and TX controls.
The PS 155 contains an audio interface which
splits the audio on the wired intercom party line
into an audio output and an audio input. Via the
audio output the audio of the party line is sent to
the wireless intercom system. Via the audio input
the audio of the wireless system is sent to the
party line. Audio output and audio input can be
separately volume controlled by a SEND
respectively a RECEIVE volume knob. Both the
output and the input are transformer balanced.
The built-in test tone generator assists obtaining
the best possible side tone rejection in the audio
interface section. The tone generator is activated
by pushing the recessed switch at the front
panel.
To connect the PS 155 to a wireless intercom
system, a special cable is needed. In this user
manual it is assumed that the cable is connected
to a simplex (‘push to talk’) wireless intercom
station (Motorola, Kenwood or other make),
hereinafter called “the wireless unit”.
If the internal Transmit Switch of the PS 155 is
triggered, the wireless unit goes from ‘receive
mode’ to ‘transmit mode’.
There are 3 ways to trigger the Transmit Switch,
to be selected by a 3-position switch in the TX
CONTROL section of the PS 155 front panel.
See sections 3.0 and 5.0.
This PS 155 is powered (30V DC) by an ASL
master station or separate power supply, via the
intercom connection cable (the party line).
Connect this cable to the LINE connector on the
rear panel. Use professional microphone cable
with 2 wires and 1 shield only.
The PS 155 is fully protected against wiring
mistakes (reverse power) or short-circuit in the
intercom connecting cable.
To connect the PS 155 to the wireless unit a
special cable is needed, to be connected to the
Sub-D9 connector on the rear panel.
1 RECEIVE volume knob
This knob is for adjusting the level of the audio
that is received from the wireless unit
2 SEND volume knob
This knob is for adjusting the level of the audio
that is sent to the wireless unit
3 SIDE TONE LOW trimmer
4 SIDE TONE HIGH trimmer
5 SIDE TONE LEVEL trimmer
Trimmers 3, 4 and 5 are for adjusting the rejection
of the side tone; the LEVEL trimmer for the whole
audio spectrum, the HIGH trimmer for fine tuning
the high frequencies and the LOW trimmer for
(10 strony)
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