User manual ASL INTERCOM PS 130

[. . . ] It incorporates a loudspeaker and a gooseneck microphone and provides full duplex communications within an ASL intercom system. The PS 130 RM model has a small built-in electret microphone. At the front panel are a Volume (listen level) control, a Talk and Call button with LED indicators and a two-stage sidetone trimmer. The unit is equiped with a limiter for the gooseneck microphone, allowing the user to speak close into the microphone without giving rise to overload and distortion. [. . . ] This headset must have a can impedance of 200 ohms (or greater), or each 400 ohms minimum when in parallel. The microphone may be of the dynamic or electret type. phones When connecting a headset, the speaker and gooseneck microphone will be disabled automatically. 10 LOUDSPEAKER A high quality loudspeaker driven by a 1. 3 Watt amplifier. Speaker and gooseneck microphone automatically shut off when a headset is used. 2 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. SIDETONE LEVEL trimmer This trimmer controls the level of your own voice as you hear it in the speaker or in the headset. It prevents the speaker from feeding back into the microphone. SIDETONE HI trimmer This trimmer controls the rejection in the high frequency range. It compensates the capacity of the interconnecting cables and prevents the speaker from feeding back into the microphone (unit feedback). Adjustment procedure for both sidetone trimmers : - set trimmer in start position : fully clockwise. - switch off the microphone of all connected (speaker !) stations. - switch on the microphone of the PS 130. - 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. 8 9 4 5 4 User Manual PS 130 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 4. 0 FRONT PANEL CONTROLS AND CONNECTOR 5. 0 SIDE PANEL CONNECTORS 11 LINE connectors These XLR-3 connectors are for connecting the PS 130 to the intercom system. audio wire The female connector is for input. The male connector is for extending the intercom line to other stations. 6. 0 INTERNAL CONTROLS Inside the unit there are two trimmers to adjust the mic gain of the gooseneck microphone and the headset microphone separately. These internal controls are located on a P. C. board. They can be reached as follows : - remove the screws of the bottom plate. [. . . ] 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. Metal cable trunks, metal connection boxes and overall 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. Keep metal connection boxes and cable trunks isolated from other metal parts. [. . . ]