Asl intercom PS 430 User Manual

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PRO SERIES

USER MANUAL

FOR THE

PS 430

FOUR CHANNEL SPEAKER STATION

CONTENTS

1.0 GENERAL DESCRIPTION ...................... 3

2.0 UNPACKING ................................. 3

3.0 INSTALLATION ............................... 3

4.0 FRONT PANEL CONTROLS AND CONNECTOR .... 4

5.0 SIDE PANEL CONNECTORS .................... 5

6.0 INTERNAL CONTROLS ........................ 5

7.0 CABLING .................................... 6

8.0 PARTY LINE, TECHNICAL CONCEPT ............. 7

9.0 GUARANTEE ................................. 7

10.0 TECHNICAL SPECIFICATIONS .................. 7

1.0 GENERAL DESCRIPTION

The PS 430 is a four 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 430 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. A master volume controls the total LED and a very distinctive and characteristic sound signal. speaker/headset volume. Smooth operation is guaranteed with the CALL button.

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

- automatic speaker attenuation (adjustable), when the As an option, a XLR-6 headset connector can be fitted for microphone is activated. binaural use of the headset. By setting internally mounted jumpers, each of the 4 channels can be assigned to either the left or the right headset can, or to both headset cans.

2.0 UNPACKING

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

* The PS 430 damage to the unit, and retain the shipping carton and * Two Y-cords XLR-5 > 2x XLR-3 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 430 will form part of an existing or new intercom The PS 430 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 430 in a 19" master station or power supply, via the intercom rack, taking 2U of rackspace. connection cable.

To connect the PS 430 onto the intercom system, use professional flexible microphone cable with 2 wires and 1 shield only. Connect the system intercom cables into the LINE connector sockets on the side panel, using both Ycords. Finally, when private conversation is desired, connect the listening headset plug into the HEADSET connector on the front panel.

4.0 FRONT PANEL CONTROLS & CONNECTOR

1 LISTEN LEVEL control knobs 6 SIDETONE HI trimmers

These knobs preset the listen level for each channel These trimmers (one for each channel) control the separately. rejection in the high frequency range. It compensates

the capacity of the interconnecting cables. It prevents

2 TALK buttons

These buttons allow you to talk to each channel microphone (unit feedback). separately or simultaneously. Any Talk button activates the gooseneck or headset microphone, the large green LED at each channel This trimmer allows you to dim the speaker automatiindicates if the microphone is switched on to that cally, when the gooseneck microphone is switched on. channel. It prevents:

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 - switch off TALK buttons. a mic mute from a PRO Series master station or power - inject an audio signal on the selected intercom supply. channel.

Momentary switching:

When a TALK button is pressed and held, the microphone will be switched on, and when released, will be switched off.

3 CALL buttons

These push buttons activate the call system, for each channel separately. A momentary push will send a call signal to all stations connected to the intercom channel and the call LEDS will start flashing. Press and hold the button for 2 seconds will activate the call buzzer, if not muted. After the CALL button is released the LEDS will continue to flash for further 2 seconds.

4 MASTER VOLUME

This knob adjusts the volume of the speaker or headset.

5 SIDETONE LEVEL trimmers

These trimmers (one for each channel) control the level of your own voice as you hear it in the speaker or headset. It prevents the speaker from feeding back into the gooseneck microphone.

Adjustment procedure for all sidetone trimmers:

- set trimmer in start position : fully clockwise.

- switch off the microphone of all connected (speaker!) stations.

- switch on the microphone of the PS 430.

- turn up volume.

- speak into the headset microphone.

- adjust the listen level by turning the sidetone trimmers.

The operating area is between fully clockwise and minimum level. Adjusting the sidetone does not affect the level of your voice as it is heard by other stations.

the speaker from feeding back into the gooseneck

7 SPEAKER ATTENUATOR trimmer

- unit feedback if sidetone rejection is not sufficient.

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

Adjustment procedure :

- turn up volume.

- activate microphone and adjust the desired amount of attenuation.

The speaker attenuator has no effect when a headset is used.

8 BUZZER VOLUME trimmer

This trimmer adjusts the volume of the internal buzzer, which is located behind the front panel. The buzzer is activated if you press the CALL button of the PS 430 or a CALL button of any other station (on the channel to which the PS 430 is connected), longer than 2 seconds and the buzzers are not muted (on the master station or power supply).

9 HEADSET connector

A XLR-4 type connector for the connection of a local headset when private conversation is desired. These must have a can impedance of 200 ohms (or greater), or each minimum 400 ohmd when in parallel. The headset microphone may be of the dynamic or electret type

Pin assignments :

1. Shield mic. (GND)

2. mic. +

3. phones +

4. phones -

When connecting a headset, speaker and gooseneck microphone will be disabled automatically. The PS 430 can optionally be equiped with a XLR-6 headset connector for binaural use. Jumpers on the front PCB board inside determine the destination of the listen signals on the headset. Each listen signal of the four channels can independantly be placed:

- on the left or right can.

- on both cans.

4.0 FRONT PANEL CONTROLS & CONNECTOR

10 GOOSENECK MICROPHONE 11 LOUDSPEAKER

A high quality electret noise canceling microphone. A high quality loudspeaker driven by a 1.3 Watt A limiter prevents the mic pre-amp from clipping when amplifier. speaking close in the microphone. The microphone is The speaker is automatically disabled when a headset automatically disabled when a headset is used. is used.

5.0 SIDE PANEL CONNECTORS

12 LINE connector for channel A & B 13 LINE connector for channel C & D

These two XLR-5 connectors are for connecting the PS 430 to the intercom system. One connector is for channels A and B, one for channel C and D.

For linking the XLR-5 sockets to XLR-3 intercom line connectors, each PS 430 comes with two Y-cords, Pin assignments XLR-5 connectors : #12 #13 having a XLR-5 connector at one end and two XLR-3 1. 0 V / ground shield A+B C+D connectors at the other end. 2. +30 V power wire channel A C On the Y-cords, the XLR-3 with the white ring corres- 3. audio wire channel A C ponds with channel A or C. 4. +30 V audio wire channel B D

5. audio wire channel B D

6.0 INTERNAL CONTROLS

Inside the unit there are two trimmers to adjust the mic - slide the plate to one side and take it out. gain of the gooseneck microphone and the headset - take away the plastic isolation plate. microphone separately. These internal controls are located on a PC board. The two trimmers are labeled : They can be reached as follows : GOOSE for the gooseneck microphone

- remove the screws of the bottom plate. HEADS for the headset microphone.

7.0 CABLING

For the PRO Series Intercom system the interconnecting cables are of the shielded two-conductor microphone cable type and the intercom line connectors are of the XLR-3 type. Audio and Call signals are on XLR pin 3, DC power is on XLR pin 2. XLR pin 1 is connected to the shield of the cable which functions as the common return for audio and power.

Since the audio signal is transferred in an way, certain rules have to be obeyed when installing the cables of an intercom network. This is to avoid earth loops and to minimize power loss and the possible effect of electromagnetic fields.

These rules are:

Use high quality (multipair) cable.

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For interconnecting user stations, power supplies and When two (multi channel) units in a network are accessories in an ASL Intercom network, use high connected by more than one cable, make sure that quality shielded two-conductor (minimum 2x 0.30 mm2) these cables are parallel to each other over the whole microphone cable only. distance between those units. When using multipair In case of a multi channel intercom network, use high cable, parallelism is ensured in the best possible way. quality microphone 'multipair' cable only, each pair consisting of two conductors (minimum 2x 0.15 mm2) with separate shield. Multipair cable should also have Always avoid that cables are making a loop. So-called an overall shield. 'ring intercom' should not physically be cabled as a

Use flexible cables.

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Use flexible single and multipair microphone cable instead of cable with solid cores, especially when the cable is subjected to bending during operation or Keep intercom cables away from high energy cables, installation. e.g. 110/220/380V mains power or dimmer controlled

Separate cable screen to XLR pin 1.

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The screen of each separate microphone cable and/or an angle of 90( only. the screen of each single pair in a multipair cable, Intercom cables should never be in the same trunking should be connected to pin 1 of each XLR-3 connector. as energy cables. Do not connect this cable screen to the metal housing of the connector or to metal wall boxes (outlets). See page 10 for Earthing Concept. In order to avoid unacceptable power losses, place the

Cable trunks, connection boxes and overall

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multipair cable screen to clean earth.

Metal cable trunks, metal connection boxes and overall multipair cable screen should be interconnected and, at one point (the 'central earthing point') in the intercom network only, be connected to a clean earth or a safety The ASL power supply may be connected to the mains earth. power outlet to which other audio equipment is See page 10 for Earthing Concept. connected. Avoid using mains outlets which also power

Keep metal connection boxes and cable trunks

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isolated from other metal parts.

Metal housings for intercom cables and connectors contact us. Please send us a block diagram of the planned should be mounted in such a way that they are isolated network with a list of all user stations and their positions, from other metal cable and connector housings and and we are happy to advise you on cabling lay out. from any other metal construction parts.

unbalanced

Keep cables parallel as much as possible.

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Avoid closed loops.

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ring. All cable routes should have a 'star' configuration, with the central earthing point (usually close to the power supply position) as the centre of the star.

Keep cables away from electromagnetic sources.

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feeds for spotlights. Intercom cables should cross whigh energy cables at

Place power supply in a central position.

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power supply as close as possible to where most power consumption occurs or, in other words, most user stations are placed.

Connect ASL power supply to a 'clean' mains

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outlet.

dimmer controlled lighting systems.

In case of more complex installations, don't hesitate to

See Party Line, Technical Concept

8.0 PARTY LINE, TECHNICAL CONCEPT 10.0 TECHNICAL SPECIFICATIONS PS 430

ASL's PRO Series offers a complete two way ('full duplex') communications system. current (at 30 V DC) 70 mA quiescent Users of the system are connected via a 'party line'. 105 mA signalling Master stations (with built-in power supply), beltpacks, 230 mA at max. output + signalling 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 gooseneck microphone type noise cancelling electret functions as earth/return. headset mic. impedance 200 ohms

Current drive is used for signal transfer. Each station presence filter +6 dB at 5 kHz utilises a current amplifier to amplify the microphone signal frequency response 200 Hz - 13 kHz (-3 dB) and place it on the common audio line where, due to the V electret mic +9 V DC 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 max. load 200 ohms loudspeakers. max. output level normal 14 V rms (200 ohms)

This principle has three advantages: max. output power normal 0.5 W rms (each can)

- the use of a single audio line allows several stations to binaural 0.16 W rms (each can) talk and listen simultaneously.

- due to the high bridging impedance offered by each station, the number of stations 'on line' has no speaker impedance 50 ohms influence on the level of the communications signal. max. output power 1.3 W rms

- power and audio to the intercom stations use the same cable.

The Call signal is also sent as a current on the audio line. output impedance > 150 Kohms It develops a DC potential over the line impedance which will be sensed by each station and interpreted as a Call signal. rejection 0 - 30dB adjustable

POWER CONSUMPTION

MIC. PREAMP

gain 40 dB - 70 dB (adjustable internally)

HEADPHONES DRIVER AMP

binaural 8 V rms (400 ohms)

SPEAKER DRIVER AMP

INTERCOM LINE DRIVER

max. output current 3 mA rms

SIDETONE

9.0 GUARANTEE

This unit is warranted by ASL Intercom to the original enduser 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.

BUZZER

max. SPL 100 dBA

DIMENSIONS AND WEIGHT

width 283 mm height 88 mm depth 42/48 mm sloping weight 1.55 Kg

GENERAL SYSTEM SPECIFICATIONS

intercom line impedance 350 ohms (1kHz)

2.2 Kohms (DC)

intercom line audio level nom. -18 dBu

max. +4 dBu dynamic range 80 dB call send signal +2.8 mA call receive signal threshold +2.4 V DC supply voltage +30 V DC (12 V to 32 V) mic mute power interrupt time 0.1 sec

Note: 0 dBu = 775 mV into open circuit ASL reserve the right to alter specifications without further notice.

Asl intercom PS 430 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual