Asl intercom PS 19 User Manual

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PRO SERIES

USER MANUAL

FOR THE

PS 19

SINGLE 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 .................. 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 19 is a portable single channel user station. The unique ASL CALL system provides both a flashing It is housed in a strong ABS case and is provided with a red LED and a very distinctive and characteristic sound steel beltclip. signal. Smooth operation is guaranteed with the CALL

button. A momentary push makes the red LED flash, On the front panel are a Volume (listen level) control, a whilst holding the button for two seconds will activate the Talk and a Call button with LED indicators, a sidetone CALL sound signal. The volume of the sound signal trimmer and a buzzer volume trimmer. (buzzer) can be adjusted at the front 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.

2.0 UNPACKING

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

* The PS 19 damage to the unit, and retain the shipping carton and * User manual relevant packing materials for use should the unit need

If any are missing, contact your dealer. returning. ASL has taken great care to ensure this product reaches If any damage has occured, please notify your dealer

you in flawless condition. immediately so that a written claim can be initiated.

Please also refer to the guarantee section of this manual.

3.0 INSTALLATION

This PS 19 will form part of an existing or new intercom To connect the PS 19 onto the intercom system, use system, and connection 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 cable into the the necessary DC voltages are derived from the intercom LINE connector socket on the rear panel. Finally connect master station or power supply, via the intercom the listening headset plug into the HEADSET connector, connection cable. also on the rear panel.

The PS 19 is fully protected against mis-wiring (reverse

power) or short-circuit in the interconnecting cables.

4.0 FRONT PANEL CONTROLS

1 VOLUME control knob

This knob adjusts the listen level for the headset.

2 TALK button

This push button activates the headset microphone, the large green LED indicates if the microphone is switched on.

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 microphone will be active until the button is released.

When the microphone is latched on, it can be muted by a Mic Mute from a PRO Series master station or power supply.

3 CALL button

This push button activates the call system. 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 SIDETONE trimmer

This trimmer adjusts the level of your own voice as you hear it in your headset.

Adjustment procedure :

- set trimmer in start position : fully clockwise.

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

- switch on the microphone of the PS 19.

- 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. Adjusting the sidetone does not affect the level of your voice as it is heard by other stations.

5 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 19 (3) or a CALL button of any other station (on the channel to which the PS 19 is connected), longer than 2 seconds and the buzzers are not muted (on the master station or power supply).

5.0 REAR PANEL CONNECTORS

6 LINE connectors

These XLR-3 connectors are for connecting the PS 19 to the intercom system.

Pin assignments :

1. 0 V / ground shield

2. +30 V power wire

3. audio wire

The female connector is for input. The male connector is for extending the intercom line to other user stations.

7 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), or each 400 ohms minimum when in parallel. The mic may be of the dynamic or electret type.

Pin assignments :

1. Shield mic. (GND)

2. mic. +

3. phones +

4. phones -

6.0 INTERNAL CONTROLS

MIC GAIN

The mic gain can be adjusted internally by a trimmer.

- Open the PS 19 by removing the four screws on the under side.

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

To decrease mic gain turn counterclockwise.

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 unbalanced ÚÚ 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. !! Keep cables parallel as much as possible.

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 these cables are parallel to each other over the whole mm2) 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 an overall shield.

!! Use flexible cables.

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.

!! Separate cable screen to XLR pin 1.

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 90E only. should be connected to pin 1 of each XLR-3 Intercom cables should never be in the same trunking connector. Do not connect this cable screen to the as energy cables. metal housing of the connector or to metal wall boxes (outlets). See page 10: Earthing Concept.

!! Cable trunks, connection boxes and overall

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 earth. See page 10: Earthing Concept.

!! Keep metal connection boxes and cable housings

isolated from other metal parts.

Metal housings for intercom cables and connectors should be mounted in such a way that they are isolated from other metal cable and connector housings and from any other metal construction parts.

!! Avoid closed loops.

Always avoid that cables are making a loop. So-called 'ring intercom' should not physically be cabled as a ring. All cable routes should have a 'star' configuration, with the central earthing point (usually close to the

!! Keep cables away from electromagnetic sources.

Keep intercom cables away from high energy cables, e.g. 110/220/380V mains power or dimmer controlled feeds for spotlights.

!! Place power supply in a central position.

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 user stations are placed.

!! Connect ASL power supply to a 'clean' mains

outlet.

The ASL power supply may be connected to the mains power outlet to which other audio equipment is connected. Avoid using mains outlets which also power dimmer controlled lighting systems.

In case of more complex installations, don't hesitate to contact us. Please send us a block diagram of the planned network with a list of all user stations and their positions, and we are happy to advise you on cabling lay out.

ÚÚ See Party Line, Technical Concept

8.0 PARTY LINE, TECHNICAL CONCEPT 10.0 TECHNICAL SPECIFICATIONS PS 19

ASL's PRO Series offers a complete two way ('full duplex') communications system.

Users of the system are connected via a 'party line'. Master stations (with built-in power supply), beltpacks, 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 functions as earth/return.

Current drive is used for signal transfer. Each station utilises a current amplifier to amplify the microphone signal 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 which can be further amplified and sent to headphones or loudspeakers.

This principle has three advantages:

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

- due to the high bridging impedance offered by each station, the number of stations 'on line' has no influence on the level of the communications signal.

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

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

POWER CONSUMPTION

current (at 30 V DC) 25 mA quiescent

40 mA signalling

135 mA at max. output + signalling

MIC. PREAMP

mic. impedance 200 ohms gain 40 dB - 70 dB (adjustable internally) presence filter +6 dB at 5 kHz frequency response 200 Hz - 13 kHz (-3 dB) V electret mic +9 V DC

HEADPHONES DRIVER AMP

max. load 200 ohms max. output level 14 V rms (200 ohms) max. output power 0.5 W rms (each headset can)

INTERCOM LINE DRIVER

max. output current 3 mA rms output impedance > 150 Kohms

SIDETONE

rejection 0 - 30dB adjustable

BUZZER

max. SPL 114 dBA

DIMENSIONS AND WEIGHT

width 90 mm height 38 mm depth 124 mm weight 295 g

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.

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 19 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual