User manual ASL INTERCOM PS 19 A

[. . . ] 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 a very high background noise level. 2. 0 UNPACKING After unpacking the unit please inspect for any physical damage 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. The shipping carton contains the parts below: * The PS 19A * 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 The PS 19A is fully protected against mis-wiring (reverse power) or short-circuit in the interconnect cables. This PS 19A will form a part of an existing or new intercom system, and connection to it is straightforward. [. . . ] The selection mic or line level is determined by the place of two jumpers inside the PS 19A (see 7. 0 Internal Controls). signal - 6 LINE connector This XLR-3 connector is for connecting the PS 19A to the intercom system. phones - 7 HEADSET connector An XLR-4 type connector for the connection of the local headset. Pin assignments : 4 User Manual PS 19A / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. User Manual PS 19A / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 5 6. 0 8 SIDE PANEL CONTROLS 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. Adjusting the sidetone does not affect the level of your voice as it is heard by other stations. 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). 9 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. Jumper position for PGM input 1-2 Line level 2-3 Mic level 6 User Manual PS 19A / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 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. 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 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: ¼ 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. 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. The screen of 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). Cable trunks, connection boxes and overall multipair cable screen to clean earth. [. . . ] 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. ¼ See Party Line, Technical Concept User Manual PS 19A / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 7 9. 0 PARTY LINE, TECHNICAL CONCEPT 11. 0 TECHNICAL SPECIFICATIONS PS 19A POWER CONSUMPTION current (at 30 V DC) 25 mA quiescent 40 mA signalling 140 mA at max. output + signalling PGM (AUX) INPUT input impedance nominal input level max. input level ASL's PRO Series offers a complete two way ('full duplex') communications system. [. . . ]