Asl intercom PS 29 User Manual

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PRO SERIES

USER MANUAL

FOR THE

PS 29

DUAL CHANNEL BELTPACK

CONTENTS

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

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

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

4.0 FRONT PANEL CONTROLS ..................... 4

5.0 REAR PANEL CONNECTORS ................... 4

6.0 SIDE PANEL CONTROLS ....................... 5

7.0 INTERNAL CONTROLS ........................ 5

8.0 CABLING .................................... 6

9.0 PARTY LINE, TECHNICAL CONCEPT ............. 7

10.0 GUARANTEE ................................. 7

11.0 TECHNICAL SPECIFICATIONS .................. 7

1.0 GENERAL DESCRIPTION

The PS 29 is a portable dual channel user station. The unique ASL Call system provides both a flashing red It is housed in a strong ABS case and it is provided with a LED and a very distinctive and characteristic sound signal. steel beltclip. Smooth operation is guaranteed with the CALL button. A

momentary push makes the red LED flash, whilst holding Both channels have independant Volume (listen level) the button for two seconds will activate the CALL sound controls, Talk and Call switches, Talk and Call LED signal. The volume of the sound signal (buzzer) can be indicators and Sidetone trimmers. adjusted at the side panel.

Special attention has been paid to the intelligibility of Fully electronic switching increases reliability and allows speech. By applying low noise/high speed opamps, a for : speech presence filter and a specially developed high - 'soft' microphone ON switching, latched or momentary power bridged headphone amplifier, communication is - remote Mic Mute facility. very comfortable even in environments with high background noise level.

As an option, a XLR-6 headset connector can be fitted allowing the user to hear channel A at the left headset can 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 29 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

imediately 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 29 will form part of an existing or new intercom To connect the PS 29 onto the intercom system, use system, and connections to it is straightforward. There are professional flexible microphone cable with 2 wires and 1 no separate power connections, or batteries to install, as shield only. Connect the system intercom cables into the the necessary DC voltage are derived from the intercom LINE connector sockets on the rear panel. Finally connect master station or power supplies, via the intercom the listening headset plug into the HEADSET connector, connections cable. also on the rear panel.

The PS 29 is fully protected against mis-wiring (reverse

power) or short-circuit in the interconnecting cables.

4.0 FRONT PANEL CONTROLS

1 VOLUME control knobs

These knobs adjust the listen levels for each channel separately. You can listen to one channel or to both channels at the same time.

2 TALK buttons

These buttons allow you to talk to each channel separately or simultaneously. The large green led indicates if the talk function is activated.

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.

Momentary switching:

When a TALK button is pressed and held, the which means that simultaneous operation is possible. microphone will be active, until the button is released. A momentary push will send a call signal to all stations

When the microphone is latched on, it can be muted by will start flashing. a Mic Mute from a PRO Series master station or power Press and hold the button for 2 seconds will activate supply. the call buzzer,if not muted.

3 CALL buttons

These buttons activate the call system. The Call functions of both channels are independant

connected to the intercom channel and the call LEDS

After the CALL button is released the LEDS will continue to flash for further 2 seconds.

5.0 REAR PANEL CONNECTORS

4 LINE connector channel B 5 LINE connector channel A

These connectors are for connecting the PS 29 to the intercom system (two separate intercom channels A and B).

Pin assignments :

1. 0V / ground shield

2. +30V power wire

3. audio wire

Both connectors are for input.

6 HEADSET connector

An XLR-4 type connector for the connection of the local headset. This must have a can impedance of 200 ohms (or greater). The mic may be of the dynamic or electret type.

Pin assignments :

1. Shield mic. (GND)

2. mic. +

3. phones +

4. phones -

Optional : Binaural XLR-6 headset connector

6.0 SIDE PANEL CONTROLS

7 SIDETONE trimmer channel A 8 SIDETONE trimmer channel B

These trimmers adjust the level of your own voice as you hear it in your headset. There is a trimmer for each channel.

Adjustment procedure :

- set trimmer in start position : fully clockwise.

- switch off the microphone of all connected stations.

- switch on the TALK of the channel you want to adjust.

- turn up volume.

- speak into the headset microphone.

- adjust the listen level by turning the sidetone trimmer.

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

9 BUZZER VOLUME trimmer

This trimmer adjusts the volume of the internal buzzer. The buzzer will be activated if a CALL-button is pressed for longer than 2 seconds and the buzzers are not muted on the power supply.

7.0 INTERNAL CONTROLS

MIC GAIN

The mic gain can be adjusted internally by a trimmer.

- Open the PS 29 by removing the four screws on the underside.

- The trimmer is located on the lower PCB board. To increase mic gain turn clockwise.

To decrease mic gain turn counterclockwise.

8.0 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 power supply position) as the center of the star. instead of cable with solid cores, especially when the cable is subjected to bending during operation or installation. Keep intercom cables away from high energy cables,

Separate cable screen to XLR pin 1.

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

Cable trunks, connection boxes and overall

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multipair cable screen to clean earth.

Metal cable trunks, metal connection boxes and overall user stations are placed. 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 earth. The ASL power supply may be connected to the mains See page 10: Earthing Concept. power outlet to which other audio equipment is

Keep metal connection boxes and cable trunks

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isolated from other metal parts.

Metal housings for intercom cables and connectors In case of more complex installations, don't hesitate to should be mounted in such a way that they are isolated contact us. Please send us a block diagram of the planned from other metal cable and connector housings and network with a list of all user stations and their positions, from any other metal construction parts. and we are happy to advise you on cabling lay out.

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

Keep cables away from electromagnetic sources.

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e.g. 110/220/380V mains power or dimmer controlled feeds for spotlights.

Place power supply in a central position.

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In order to avoid unacceptable power losses, place the power supply as close as possible to where most power consumption occurs or, in other words, most

Connect ASL power supply to a 'clean' mains

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outlet.

connected. Avoid using mains outlets which also power dimmer controlled lighting systems.

See Party Line, Technical Concept

9.0 PARTY LINE, TECHNICAL CONCEPT 11.0 TECHNICAL SPECIFICATIONS PS 29

ASL's PRO Series offers a complete two way ('full duplex') communications system. current (at 30 V DC) 30 mA quiescent Users of the system are connected via a 'party line'. 45 mA signalling Master stations (with built-in power supply), beltpacks, 170 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 mic. impedance 200 ohms functions as earth/return. gain 40 dB - 70 dB (adjustable internally)

Current drive is used for signal transfer. Each station frequency response 200 Hz - 13 kHz (-3 dB) utilises a current amplifier to amplify the microphone signal V electret mic +9 V DC 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 max. load 200 ohms which can be further amplified and sent to headphones or max. output level normal 14 V rms (200 ohms) loudspeakers. binaural 8 V rms (400 ohms)

This principle has three advantages: binaural 0.16 W rms (each can)

- the use of a single audio line allows several stations to talk and listen simultaneously.

- due to the high bridging impedance offered by each max. output current 3 mA rms station, the number of stations 'on line' has no output impedance > 150 Kohms influence on the level of the communications signal.

- power and audio to the intercom stations use the same cable. rejection 0 - 30dB adjustable

The Call signal is also sent as a current on the audio line. It develops a DC potential over the line impedance which max. SPL 101 dBA will be sensed by each station and interpreted as a Call signal.

POWER CONSUMPTION

MIC. PREAMP

presence filter +6 dB at 5 kHz

HEADPHONES DRIVER AMP

max. output power normal 0.5 W rms (each can)

INTERCOM LINE DRIVER

SIDETONE

BUZZER

DIMENSIONS AND WEIGHT

width 90 mm height 38 mm depth 124 mm weight 325 g

10.0 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.

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 reserves the right to alter specifications without further

notice.

Asl intercom PS 29 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual