Asl intercom PS 230 User Manual

PRO SERIES

USER MANUAL

FOR THE

PS 230

DUAL CHANNEL SPEAKER STATION

CONTENTS

1.0 GENERAL DESCRIPTION ...................... 1

2.0 UNPACKING ................................. 1

3.0 INSTALLATION ............................... 1

4.0 FRONT PANEL CONTROLS AND CONNECTOR .... 2

5.0 SIDE PANEL CONNECTORS .................... 3

6.0 INTERNAL CONTROLS ........................ 4

7.0 CABLING .................................... 4

8.0 PARTY LINE, TECHNICAL CONCEPT ............. 5

9.0 GUARANTEE ................................. 5

10.0 TECHNICAL SPECIFICATIONS .................. 5

User Manual PS 230 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.

1.0 GENERAL DESCRIPTION

The PS 230 is a dual channel speaker station designed for Special attention has been paid to the intelligibility of
use in both portable and fixed intercom systems. speech. By applying low noise/high speed opamps, a
It incorporates a loudspeaker and a gooseneck speech presence filter and a specially developed high
microphone and provides full duplex communications power bridged headphone amplifier, communication is
within an ASL intercom system. The PS 230 RM model very comfortable even in environments with high back­has a small built-in electret microphone. ground-noise level. There is a separate amplifier for the

loudspeaker.
Each channel has a Volume (listen level) control, a Talk
and Call button with LED indicators and a two-stage The unique ASL CALL system provides both a flashing red
sidetone trimmer. LED and a very distinctive and characteristic sound signal.

Smooth operation is guaranteed with the CALL button.
The unit is equiped with a limiter for the gooseneck Only a slight touch makes the red LED flash, whilst holding
microphone, allowing the user to speak close into the the button for two seconds will activate the CALL sound
microphone without giving rise to overload and distortion. signal. The volume of the sound signal (buzzer) can be
Loudspeaker dimming is automatic when the microphone adjusted at the front panel.
is active. Private conversation may be carried out via the
headset connector with a headset or telephone handset. Fully electronic switching increases reliability and allows
When a headset is connected, both the gooseneck for :
microphone and speaker are disabled automatically. - 'soft' microphone ON switching, latched or momentary

- remote Mic Mute facility.
As an option, a XLR-6 headset connector can be fitted - automatic speaker attenuation (adjustable), when the
allowing the user to hear channel A at the left headset can microphone is activated.
and channel B at the right headset can.

2.0 UNPACKING

The shipping carton contains the parts below: After unpacking the unit please inspect for any physical

damage to the unit, and retain the shipping carton and
* The PS 230 relevant packing materials for use should the unit need
* User manual returning.

If any are missing, contact your dealer. If any damage has occured, please notify your dealer

immediately so that a written claim can be initiated. Please

ASL has taken great care to ensure this product reaches also refer to the guarantee section of this manual.
you in flawless condition.

3.0 INSTALLATION

This PS 230 will form part of an existing or new intercom The PS 230 is fully protected against mis wiring (reverse
system, and connection to it is straightforward. There are power) or short circuit in the interconnect cables.
no separate power connections, or batteries to install, as
the necessary DC voltages are derived from the intercom A special kit is available for mounting the PS 230 in a 19"
master station or power supply, via the intercom rack, taking 2U of rack space.
connection cable.

To connect the PS 230 to the intercom system, use
professional flexible microphone cable with 2 wires and 1
screen only. Connect the system intercom cable to the
LINE connector socket on the side panel. Finally, when
private conversation is desired, connect the listening
headset plug to the HEADSET connector on the front
panel.

User Manual PS 230 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.

1

4.0 FRONT PANEL CONTROLS & CONNECTOR

1 VOLUME control knobs 5 SIDETONE HI trimmers

These knobs adjust the listen level for speaker and These trimmers (one for each channel) control the
headset. The level of each channel can be adjusted rejection in the high frequency range. It compensates
separately. the capacity of the interconnecting cables. It prevents

the speaker from feeding back into the microphone

2 TALK buttons

These buttons allow you to talk to each channel
separately or simultaneously.
Any Talk button activates the gooseneck or headset This trimmer allows you to dim the speaker automati­microphone, the large green LED at each channel cally, when the gooseneck microphone is switched on.
indicates if the microphone is switched on to that It prevents:
channel. - unit feedback if sidetone rejection is not sufficient.

Latched switching:

When a TALK button is pressed quickly, the
microphone will be switched on, and is electronically
latched. When pressed again, the microphone will be
switched off.

When the microphone is latched on, it can be muted by - inject an audio signal on the selected intercom
a mic mute from a PRO Series master station or power channel.
supply. - turn up volume.

Momentary switching:

When a TALK button is pressed and held, the
microphone will be switched on, and when released, The speaker attenuator has no effect when a headset
will be switched off. is used.

(unit feedback).

6 SPEAKER ATTENUATOR trimmer

- system feedback or a 'hollow' sound when the
microphones of other speaker stations on the same
channel are activated simultaneously.

Adjustment procedure :

- switch off TALK buttons.

- activate microphone and adjust the desired amount
of attenuation.

3 CALL buttons 7 BUZZER VOLUME trimmer

These push buttons activate the call system, for each This trimmer adjusts the volume of the internal buzzer,
channel separately. which is located behind the front panel.
A momentary push will send a call signal to all stations The buzzer is activated if you press the CALL button of
connected to the intercom channel and the call LEDS the PS 230 or a CALL button of any other station (on
will start flashing. the channel to which the PS 230 is connected), longer
Press and hold the button for 2 seconds will activate than 2 seconds and the buzzers are not muted (at the
the call buzzer, if not muted. master station or power supply).
After the CALL button is released the LEDS will
continue to flash for further 2 seconds.

4 SIDETONE LEVEL trimmers

These trimmers (one for each channel) control the level must have a can impedance of 200 ohms (or greater),
of your own voice as you hear it in the speaker or or each 400 Ohms minium when in parallel.
headset. It prevents the speaker from feeding back into The headset microphone may be of the dynamic or
the gooseneck microphone. electret type.

Adjustment procedure for all sidetone trimmers : Pin assignments :

- set trimmer in start position : fully clockwise. 1. Shield mic. (GND)

- switch off the microphones of all connected 2. mic. +
(speaker !) stations. 3. phones +

- switch on the microphone of the PS 230. 4. phones -

- turn up volume.

- speak into the headset microphone. When connecting a headset, the speaker and

- adjust the listen level by turning the sidetone gooseneck microphone will be disabled automatically.
trimmer.

The operating area is between fully clockwise and headset connector for binaural use.
minimum level. Adjusting the sidetone does not affect Channel A will then appear on the left can and channel
the level of your voice as it is heard by other stations. B on the right can.

8 HEADSET connector

A XLR-4 type connector for the connection of a local
headset when private conversation is desired. This

The PS 230 can optionally be equipped with a XLR-6

2

User Manual PS 230 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.