User manual ASL INTERCOM PS 230

[. . . ] 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. Private conversation may be carried out via the headset connector with a headset or telephone handset. When a headset is connected, both the gooseneck microphone and speaker are disabled automatically. As an option, a XLR-6 headset connector can be fitted allowing the user to hear channel A at the left headset can and channel B at the right headset can. 2. 0 UNPACKING 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. [. . . ] The buzzer is activated if you press the CALL button of the PS 230 or a CALL button of any other station (on the channel to which the PS 230 is connected), longer than 2 seconds and the buzzers are not muted (at the master station or power supply). HEADSET connector A XLR-4 type connector for the connection of a local headset when private conversation is desired. This must have a can impedance of 200 ohms (or greater), or each 400 Ohms minium when in parallel. phones When connecting a headset, the speaker and gooseneck microphone will be disabled automatically. The PS 230 can optionally be equipped with a XLR-6 headset connector for binaural use. Channel A will then appear on the left can and channel B on the right can. 2 6 3 CALL buttons These push buttons activate the call system, for each channel separately. 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 trimmers These trimmers (one for each channel) control the level of your own voice as you hear it in the speaker or headset. It prevents the speaker from feeding back into the gooseneck microphone. Adjustment procedure for all sidetone trimmers : - 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. 8 4 2 User Manual PS 230 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 4. 0 FRONT PANEL CONTROLS & CONNECTOR 9 GOOSENECK MICROPHONE A high quality electret noise canceling microphone. A limiter prevents the microphone preamplifier from clipping when speaking close into the microphone. The gooseneck microphone is automatically disabled when a headset is used. 10 LOUDSPEAKER A high quality loudspeaker driven by a 3. 5 Watt amplifier. The speaker is automatically disabled when a headset is used. 5. 0 SIDE PANEL CONNECTORS 11 LINE connector channel A 12 LINE connector channel B These XLR-3 connectors are for connecting the PS 230 to the intercom system. audio wire 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 trimmers can be reached as follows : - remove the screws of the bottom plate. The two trimmers are labeled : GOOSE for the gooseneck microphone HEADS for the headset microphone. User Manual PS 230 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland. 3 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. 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. [. . . ] 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. output level normal 14 V rms (200 ohms) binaural 8 V rms (400 ohms) max. output power normal 0. 5 W rms (each can) binaural 0. 16 W rms (each can) SPEAKER DRIVER AMP speaker impedance max. [. . . ]