Asl intercom PS 19A User Manual

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PRO SERIES

USER MANUAL

FOR THE

PS 19A

SINGLE CHANNEL BELTPACK WITH PGM (AUX) INPUT

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 19A is a portable single channel user station, The unique ASL CALL system provides both a flashing equiped with a volume controlled input for external audio LED and a very distinctive and characteristic sound signal. (program) signals. Smooth operation is guaranteed with the CALL button. A It is housed in a strong ABS case and it is provided with a momentary push makes the red LED flash, whilst holding steel beltclip. the button for two seconds will activate the CALL sound

signal. The volume of the sound signal (buzzer) can be On the front panel are Volume (listen level) controls for the adjusted at the side panel. PGM and the communications signals and a Talk and a Call button with LED indicators. A PGM input at the rear of the PS 19A, allows the

connection of external audio signals which will only be Special attention has been paid to the intelligibility of heard at the local headset. speech. By applying low noise/high speed opamps, a As an optional extra, an XLR-6 headset connector can be speech presence filter and a specially developed high fitted, allowing the user to hear the intercom signal at the power bridged headphone amplifier, communication is left headset can and the PGM signal at the right headset very comfortable even in environments with a very high can. background noise level.

Fully electronic switching increases reliability and allows

for :

- 'soft' microphone ON switching, latched or momentary.

- remote Mic Mute facility.

2.0 UNPACKING

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

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

If any damage has occured, please notify your dealer If any are missing, contact your dealer. immediately so that a written claim can be initiated. Please

also refer to the guarantee section of this manual. ASL has taken great care to ensure this product reaches you in flawless condition.

3.0 INSTALLATION

This PS 19A will form a part of an existing or new intercom The PS 19A 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 master station or power supplies, via the intercom connection cable.

To connect the PS 19A onto the intercom system, use professional flexible microphone cable with 2 wires ans 1 shield only. Connect the system intercom cable to the LINE connector socket on the rear panel. Finally connect the listening headset plug into the HEADSET connector, also on the rear panel.

4.0 FRONT PANEL CONTROLS

1 PGM VOLUME control knob

This knob adjusts the level of the the PGM input signal as it will be heard in your own headset.

2 VOLUME control knob

This knob adjusts the intercom line listen-level for the headset.

3 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. This push button activates the call system.

Momentary switching:

When a TALK button is pressed and held, the LEDS will start flashing. microphone will be active, until the button is released. Press and hold the button for 2 seconds will activate When the microphone is latched on, it can be muted by the call buzzer, if not muted. a Mic Mute from a PRO Series master station or power After the CALL button is released the LEDS will supply. continue to flash for further 2 seconds.

4 CALL button

A momentary push will send a CALL signal to all stations connected to the intercom channel and the call

5.0 REAR PANEL CONNECTORS

5 PGM connector

This PGM input is electronically balanced and accepts audio levels between -18dBu and +22dBu when configured on line level and between -38dBu and +2dBu when configured on mic level. The selection mic or line level is determined by the place of two jumpers inside the PS 19A (see 7.0 Internal Controls). The unit is factory set on line level.

Pin assignments :

1. 0 V / ground

2. signal +

3. signal -

7 HEADSET connector

An XLR-4 type connector for the connection of the local 2. mic. + headset. This must have a can impedance of 200 3. phones + ohms or greater. The mic may be of the dynamic or 4. phones electret type.

Pin assignments :

6 LINE connector

This XLR-3 connector is for connecting the PS 19A to the intercom system.

Pin assignments :

1. 0V / ground shield

2. +30 V power wire

3. audio wire

1. Shield mic. (GND)

6.0 SIDE PANEL CONTROLS

8 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 TALK on of the PS 19A.

- turn up volume.

- speak into the headset mic.

- adjust 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.

9 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 19A or a CALL button of any other station (on the channel to which the PS 19A is connected), for longer than 2 seconds and the buzzers are not muted (on the master station or power supply).

7.0 INTERNAL CONTROLS

MIC GAIN

The mic gain can be adjusted internally by a trimmer, located on the lower PCB.

PGM LINE/MIC LEVEL selection

Two jumpers inside the PS19A determine the selection between MIC and Line level for the PGM input.

- Open the PS19A by removing the four screws on the underside.

- Remove the screws which fasten the upper PCBboard.

- Remove the upper PCB-board by lifting it up.

- On the upper PCB board you see two jumpers. Jumper position for PGM input

1-2 Line level 2-3 Mic level

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 19A

ASL's PRO Series offers a complete two way ('full duplex') communications system. current (at 30 V DC) Users of the system are connected via a 'party line'. 25 mA quiescent Master stations (with built-in power supply), beltpacks, 40 mA signalling speaker stations and power supplies are interconnected 140 mA at max. output + signalling 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. input impedance 30 Kohms (balanced line level)

Current drive is used for signal transfer. Each station nominal input level -18 dBu to +6 dBu (line level) utilises a current amplifier to amplify the microphone signal -38 dBu to -14 dBu (mic level) and place it on the common audio line where, due to the max. input level +22 dBu (line level) constant line impedance (situated in the power supply +2 dBu (mic level) between XLR pin 3 and 1), a signal voltage is developed which can be further amplified and sent to headphones or loudspeakers. mic. impedance 200 ohms

This principle has three advantages: presence filter +6 dB at 5 kHz

- the use of a single audio line allows several stations to frequency response 200 Hz - 13 kHz (-3 dB) talk and listen simultaneously. V electret mic +9 V DC

- 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. max. load 200 ohms

- power and audio to the intercom stations use the same max. output level 14 V rms (200 ohms) cable. max. output power 0.5 W rms (each headset can)

The Call signal is also sent as a current on the audio line. It develops a DC potential over the line impedance which max. output current 3 mA rms will be sensed by each station and interpreted as a Call output impedance > 150 Kohms signal.

POWER CONSUMPTION

PGM (AUX) INPUT

4.6 Kohms (balanced mic level)

MIC. PREAMP

gain 40 dB - 70 dB (adjustable internally)

HEADPHONES DRIVER AMP

INTERCOM LINE DRIVER

SIDETONE

rejection 0 - 30dB adjustable

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.

BUZZER

max. SPL 106 dBA

DIMENSIONS AND WEIGHT

width 90 mm height 38 mm depth 124 mm weight 310 g

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 19A User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual