User Manual
Contents
1. earthing point usually close to the power supply position as the center of the star 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 Intercom cables should cross high energy cables at an angle of 90 only Intercom cables should never be in the same trunking as energy cables 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 User Manual PS 19 Issue 1 1994 ASL Intercom Utrecht Holland 8 0 PARTY LINE TECHNICAL CONCEPT 10 0 TECHNICAL SPECIFICATIONS PS 19 ASL s PRO Series offers a complete two way full duplex POWER CONSUMPTION communications system current at 30 V DC 25 mA quiescent 40 mA signalling Users of the system are connected via a party line2. 135 mA at max output signalling Master stations with built in power supply beltpacks speaker stations and power supplies are interconnected MIC PREAMP via standard microphone cable One wire is used as an mic impedance 200 ohms audio line one as a power line and the screen of the gain 40 dB 70 dB adjustable internally 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 VDC utilises a current amplifier to amplify the microphone signal and place it on the common audio line where due HEADPHONES DRIVER AMP to the constant line impedance situated in the power max load 200 ohms supply between XLR pin 3 and 1 a signal voltage is max output level 14 V rms 200 ohms developed which can be further amplified and sent to max output power 0 5 W rms each headset can 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 stations to output impedance gt 150 Kohms talk and listen simultaneously due to the high bridging impedance offered by each SIDETONE station the number of stations on line has no rejection 0 30dB adjustable influence on the level of the communications signal power and audio to the intercom stations use the BUZZER same cable max SPL 114 dBA The Call signal is also sent as a curren
3. PRO SERIES USER MANUAL FOR THE PS 19 SINGLE CHANNEL BELTPACK CONTENTS 1 0 GENERAL DESCRIPTION 2 0 UNPACKING 3 0 INSTALLATION 4 0 FRONT PANEL CONTROLS 5 0 REAR PANEL CONNECTORS 6 0 INTERNAL CONTROLS 7 0 CABLING 8 0 PARTY LINE TECHNICAL CONCEPT 9 0 GUARANTEE 10 0 TECHNICAL SPECIFICATIONS User Manual PS 19 Issue 1 1994 ASL Intercom Utrecht Holland User Manual PS 19 Issue 1 1994 ASL Intercom Utrecht Holland 1 0 GENERAL DESCRIPTION The PS 19 is a portable single channel user station It is housed in a strong ABS case and is provided with a steel beltclip On the front panel are a Volume listen level control a Talk and a Call button with LED indicators a sidetone trimmer and a buzzer volume trimmer 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 high power bridged headphone amplifier communication is very comfortable even in environments with high background noise level 2 0 UNPACKING The shipping carton contains the parts listed below The PS 19 User manual If any are missing contact your dealer ASL has taken great care to ensure this product reaches you in flawless condition 3 0 INSTALLATION This PS 19 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
4. 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 4 User Manual PS 19 Issue 1 1994 ASL Intercom Utrecht Holland 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 cl
5. f each separate microphone cable and or the screen of each single pair in a multipair cable should be connected to pin 1 of each XLR 3 connector Do not connect this cable screen to the metal housing of the connector or to metal wall boxes outlets See page 10 Earthing Concept e 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 inter connected 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 e 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 x See Party Line Technical Concept Keep cables parallel as much as possible When two multi channel units in a network are connected by more than one cable make sure that these cables are parallel to each other over the whole distance between those units When using multipair cable parallelism is ensured in the best possible way 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
6. necessary DC voltages are derived from the intercom master station or power supply via the intercom connection cable The unique ASL CALL system provides both a flashing red LED and a very distinctive and characteristic sound signal Smooth operation is guaranteed with the CALL button A momentary push makes the red LED flash whilst holding the button for two seconds will activate the CALL sound signal The volume of the sound signal buzzer can be adjusted at the front panel Fully electronic switching increases reliability and allows for soft microphone ON switching latched or momentary remote Mic Mute facility After unpacking the unit please inspect for any physical damage to the unit and retain the shipping carton and relevant packing materials for use should the unit need returning 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 To connect the PS 19 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 listening headset plug into the HEADSET connector also on the rear panel The PS 19 is fully protected against mis wiring reverse power or short circuit in the interconnecting cables User Manual PS 19 Issue 1 1994 ASL Intercom Utrecht H
7. ockwise To decrease mic gain turn counterclockwise User Manual PS 19 Issue 1 1994 ASL Intercom Utrecht Holland 5 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 x 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 e Use high quality multipair cable For interconnecting user stations power supplies and accessories in an ASL Intercom network use high quality shielded two conductor minimum 2x 0 30 mm2 microphone cable only In case of a multi channel intercom network use high 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 e Use flexible cables Use flexible single and multipair microphone cable instead of cable with solid cores especially when the cable is subjected to bending during operation or installation e Separate cable screen to XLR pin 1 The screen o
8. olland CA 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 momentan 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
9. ser Manual PS 19 Issue 1 1994 ASL Intercom Utrecht Holland 11
10. t on the audio line DIMENSIONS AND WEIGHT It develops a DC potential over the line impedance which width 90 mm will be sensed by each station and interpreted as a Call height 38 mm signal depth 124 mm weight 295 g GENERAL SYSTEM SPECIFICATIONS intercom line impedance 350 ohms 1kHz 2 2 Kohms DC 9 0 GUARANTEE intercom line audio level nom 18 dBu max 4 dBu This unit is warranted by ASL Intercom to the original eng dynamic range 80 dB call send signal 2 8 mA ell call receive signal threshold 2 4V DC date of shipment to the end user supply voltage 30 V DC 12 V to 32 V mic mute power interrupt time 0 1 sec 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 Note 0 dBu 775 mV into open circuit supplier or your local ASL dealer with shipping prepaid A note must be included stating the faults found and a copy ASL reserves the right to alter specifications without of the original suppliers invoice further notice THIS PRODUCT WAS DESIGNED DEVELOPED AND MANUFACTURED BY AMPCO SOUND LAB BV MAARSSEN UTRECHT HOLLAND User Manual PS 19 Issue 1 1994 ASL Intercom Utrecht Holland 7 User Manual PS 19 Issue 1 1994 ASL Intercom Utrecht Holland User Manual PS 19 Issue 1 1994 ASL Intercom Utrecht Holland User Manual PS 19 Issue 1 1994 ASL Intercom Utrecht Holland U
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