Asl intercom PS 19 M User Manual

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PRO SERIES

USER MANUAL

FOR THE

PS 19 M

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 ................... 4

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

CALL button. A momentary push makes the extra On the front panel are a Volume (listen level) control, a bright red LED flash, whilst holding the button for two Talk and a Call button with LED indicators. seconds will activate the CALL sound signal. The

volume of the sound signal (buzzer) can be adjusted at Special attention has been paid to the intelligibility of the front panel. speech. By applying low noise/high speed opamps, a speech presence filter and a specially developed high Fully electronic switching increases reliability and power bridged headphone amplifier, communication is allows for : very comfortable even in environments with high - 'soft' microphone ON switching, latched or background noise level. momentary

- remote Mic Mute facility.

2.0 UNPACKING

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

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

If any are missing, contact your dealer. the unit need returning.

ASL has taken great care to ensure this product If any damage has occured, please notify your dealer reaches 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 19M will form part of an existing or new To connect the PS 19M onto the intercom system, use intercom system, and connection to it is straightfor- professional flexible microphone cable with 2 wires ward. There are no separate power connections, or and 1 shield only. Connect the system intercom cable batteries to install, as the necessary DC voltages are into the LINE connector socket on the rear panel. derived from the intercom master station or power Finally connect the listening headset plug into the supply, via the intercom connection cable. HEADSET connector, also on the rear panel.

The PS 19M 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 bright green LED(4) 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.

5.0 REAR PANEL CONNECTORS

4 LINE connectors

These XLR-3 connectors are for connecting the PS 19M 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.

5 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 BOTTOM CONTROLS

4 MIC GAIN

The mic gain can be adjusted internally by a trimmer. 6 BUZZER VOLUME trimmer

This trimmer adjusts the volume of the internal

- Open the PS 19M by removing the four screws buzzer, which is located behind the front panel. on the under side. The buzzer is activated if you press the CALL

- The trimmer is located on the lower PCB board. button of the PS 19 (3) or a CALL button of any

other station (on the channel to which the PS 19M To increase mic gain turn clockwise. is connected), longer than 2 seconds and the To decrease mic gain turn counterclockwise. buzzers are not muted (on the master station or

power supply).

5 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.

7.0 CABLING

For the PRO Series Intercom system the interconnecting cables are of the shielded twoconductor 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 þ 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:

þ Use high quality (multipair) cable. þ Keep cables parallel as much as possible.

For interconnecting user stations, power supplies When two (multi channel) units in a network are and accessories in an ASL Intercom network, use connected by more than one cable, make sure that high quality shielded two-conductor (minimum 2x these cables are parallel to each other over the

0.30 mm2) microphone cable only. whole distance between those units. When using In case of a multi channel intercom network, use multipair cable, parallelism is ensured in the best high quality microphone 'multipair' cable only, each possible way. pair consisting of two conductors (minimum 2x

0.15 mm2) with separate shield. Multipair cable þ Avoid closed loops. should also have an overall shield. Always avoid that cables are making a loop. So-

called 'ring intercom' should not physically be

þ Use flexible cables. cabled as a ring. All cable routes should have a

Use flexible single and multipair microphone cable 'star' configuration, with the central earthing point instead of cable with solid cores, especially when (usually close to the power supply position) as the the cable is subjected to bending during operation center of the star. or installation.

þ Keep cables away from electromagnetic sources.

þ Separate cable screen to XLR pin 1. Keep intercom cables away from high energy

The screen of each separate microphone cable cables, e.g. 110/220/380V mains power or dimmer and/or the screen of each single pair in a multipair controlled feeds for spotlights. cable, should be connected to pin 1 of each XLR-3 Intercom cables should cross high energy cables connector. Do not connect this cable screen to the at an angle of 90þ only. metal housing of the connector or to metal wall Intercom cables should never be in the same boxes (outlets). trunking as energy cables. See page 10: Earthing Concept.

þ Place power supply in a central position.

þ Cable trunks, connection boxes and overall In order to avoid unacceptable power losses, place

multipair cable screen to clean earth. the power supply as close as possible to where Metal cable trunks, metal connection boxes and most power consumption occurs or, in other overall multipair cable screen should be inter- words, most user stations are placed. connected and, at one point (the 'central earthing point') in the intercom network only, be connected þ Connect ASL power supply to a 'clean' mains to a clean earth or a safety earth. outlet. See page 10: Earthing Concept. The ASL power supply may be connected to the

mains power outlet to which other audio equipment

þ Keep metal connection boxes and cable housings is connected. Avoid using mains outlets which also

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

to advise you on cabling lay out.

þ See Party Line, Technical Concept

8.0 PARTY LINE, TECHNICAL CONCEPT 10.0 TECHNICAL SPECIFICATIONS PS 19M

ASL's PRO Series offers a complete two way ('full POWER CONSUMPTION duplex') communications system. current (at 30 V DC) 25 mA quiescent

40 mA signalling Users of the system are connected via a 'party line'. 135 mA at max. output + signalling Master stations (with built-in power supply), beltpacks, speaker stations and power supplies are MIC. PREAMP interconnected via standard microphone cable. One mic. impedance 200 ohms wire is used as an audio line, one as a power line and gain 40 dB - 70 dB (adjustable internally) the screen of the cable functions as earth/return. presence filter +6 dB at 5 kHz

frequency response 200 Hz - 13 kHz (-3 dB) Current drive is used for signal transfer. Each station V electret mic +9 V DC utilises a current amplifier to amplify the microphone signal and place it on the common audio line where, HEADPHONES DRIVER AMP due to the constant line impedance (situated in the max. load 200 ohms power supply between XLR pin 3 and 1), a signal max. output level 14 V rms (200 ohms) voltage is developed which can be further amplified max. output power 0.5 W rms (each headset can) and sent to headphones or loudspeakers.

INTERCOM LINE DRIVER This principle has three advantages: max. output current 3 mA rms

- the use of a single audio line allows several output impedance > 150 Kohms

stations to talk and listen simultaneously.

- due to the high bridging impedance offered by SIDETONE

each station, the number of stations 'on line' has rejection 0 - 30dB adjustable no influence on the level of the communications signal. BUZZER

- power and audio to the intercom stations use the max. SPL 114 dBA

same cable.

DIMENSIONS AND WEIGHT The Call signal is also sent as a current on the audio width 90 mm line. It develops a DC potential over the line impedance height 38 mm which will be sensed by each station and interpreted depth 124 mm as a Call signal. weight 295 g

9.0 GUARANTEE

This unit is warranted by ASL Intercom to the original end-user 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 M User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual