Asl intercom BS 15 User Manual

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BASIC SERIES

USER MANUAL

FOR THE

BS 15

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 BS 15 is a portable single channel user station The unique ASL CALL system provides both a flashing red housed in a strong ABS case. LED and a very distinctive and characteristic sound signal.

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

adjusted at the front panel. Special attention has been paid to the intelligibility of speech. By applying low noise/high speed opamps, a speech presence filter and a specially developed amplifier, communication is very comfortable even in environments with a very high background noise level.

2.0 UNPACKING

The shipping carton contains the parts listed below: ASL has taken great care to ensure this product reaches

you in flawless condition.

* The BS 15 After unpacking the unit please inspect for any physical * User manual damage to the unit, and retain the shipping carton and

relevant packing materials for use should the unit need If any are missing, contact your dealer. returning.

3.0 INSTALLATION

This BS 15 will form part of an existing or new intercom system, and connection to it is straightforward. There are no separate power connections, or batteries to install, as the necessary DC voltages are derived from the intercom master station or power supply, via the intercom connection cable.

To connect the BS 15 onto the intercom system, use professional flexible microphone cable with 2 wires and 1 shield only. Connect the system intercom cable into the LINE connector socket on the rear panel. Finally connect the headset plug into the HEADSET connector, also on the rear panel.

If any damage has occured, please notify your dealer

immediately so that a written claim can be initiated. Please

also refer to the guarantee section of this manual.

The BS 15 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.

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. 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 BS 15.

- 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 BS 15 (3) or a CALL button of any other station (on the channel to which the BS 15 is connected), longer than 2 seconds.

5.0 REAR PANEL CONNECTORS

6 LINE connectors

These XLR-3 connectors are for connecting the BS 15 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 minimum 400 ohms 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 - (GND)

6.0 INTERNAL CONTROLS

MIC GAIN

The mic gain can be adjusted internally by a trimmer.

- Open the BS 15 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.

7.0 CABLING

For the BASIC 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 (two 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 two 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 centre 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 for 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 for Earthing Concept. power outlet to which other audio equipment is

Keep metal connection boxes and cable housings

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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

8.0 PARTY LINE, TECHNICAL CONCEPT 10.0 TECHNICAL SPECIFICATIONS BS 15

ASL's BASIC Series offers a complete two way ('full duplex') communications system. current (at 30 V DC) 18 mA quiescent Users of the system are connected via a 'party line'. 35 mA signalling Master stations (with built-in power supply), beltpacks and 80 mA at max. output + signalling 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 mic. impedance 200 ohms 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 the max. output level 8 V rms (200 ohms) headphones. max. output power 0.16 W rms (each headset can)

This principle has three advantages:

- the use of a single audio line allows several stations to max. output current 3 mA rms talk and listen simultaneously. output impedance > 150 Kohms

- 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. rejection 0 - 30dB adjustable

- 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 width 90 mm signal. height 38 mm

POWER CONSUMPTION

MIC. PREAMP

presence filter +6 dB at 5 kHz

HEADPHONES DRIVER AMP

INTERCOM LINE DRIVER

SIDETONE

BUZZER

max. SPL 100 dBA

DIMENSIONS AND WEIGHT

depth 124 mm weight 260 gramms

GENERAL SYSTEM SPECIFICATIONS

intercom line impedance 350 ohms (1kHz)

2.2 Kohms (DC)

9.0 GUARANTEE

This unit is warranted by ASL Intercom to the original end- call send signal +2.8 mA user purchaser against defects in workmanship and call receive signal threshold +2.4 V DC materials in it's manufacture for a period of one year from supply voltage +30 V DC (12 V to 32 V) 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 ASL reserves the right to alter specifications without further faulty it should be sent in it's original packing, to the notice. 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.

intercom line audio level nom. -18 dBu

max. +4 dBu

dynamic range 80 dB

Note : 0dBu = 775 mV into open circuit

Asl intercom BS 15 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual