User manual

User Manual PS 630 / Issue 1 © 1994 ASL Intercom, Utrecht, Holland.
5
rejection in the high frequency range. It
compensates the capacity of the interconnecting
cables. It prevents the speaker from feeding back
into the gooseneck microphone (unit feedback).
4.0 FRONT PANEL CONTROLS & CONNECTOR continued
8 SPEAKER ATTENUATOR trimmer - on the left or right can.
This trimmer allows you to dim the speaker
automatically, when the gooseneck microphone
is switched on. It prevents:
- unit feedback if sidetone rejection is not 10 HEADSET connector
sufficient. A XLR-4 type connector for the connection of a
- system feedback or a 'hollow' sound when the local headset when private conversation is
gooseneck microphones of other speaker desired. These must have a can impedance of
stations on the same channel are activated 200 ohms (or greater), or each minimum 400
simultaneously. ohmd when in parallel.
Adjustment procedure : or electret type
- switch off TALK buttons.
- inject an audio signal on the selected Pin assignments :
intercom channel. 1. Shield mic. (GND)
- turn up volume. 2. mic. +
- activate microphone and adjust the desired 3. phones +
amount of attenuation. 4. phones -
The speaker attenuator has no effect when a When connecting a headset, speaker and
headset is used. gooseneck microphone will be disabled
9 BUZZER VOLUME trimmer The PS 630 can optionally be equiped with a XLR-
This trimmer adjusts the volume of the internal 6 headset connector for binaural use.
buzzer, which is located behind the front panel. Jumpers on the front PCB board inside determine
The buzzer is activated if you press the CALL the destination of the listen signals on the
button of the PS 630 or a CALL button of any headset.
other station (on the channel to which the PS 630 Each listen signal of the six channels can
is connected), longer than 2 seconds and the independantly be placed:
buzzers are not muted (on the master station or - on the left or right can.
power supply). - on both cans.
10 HEADSET connector 11 GOOSENECK MICROPHONE
A XLR-4 type connector for the connection of a A high quality electret noise canceling
local headset when private conversation is microphone.
desired. These must have a can impedance of A limiter prevents the mic pre-amp from clipping
200 ohms (or greater), or each minimum 400 ohm when speaking close in the microphone. The
when in parallel. microphone is automatically disabled when a
The headset microphone may be of the dynamic headset is used.
or electret type
Pin assignments : A high quality loudspeaker driven by a 1.3 Watt
1. Shield mic. (GND) amplifier.
2. mic. + The speaker is automatically disabled when a
3. phones + headset is used.
4. phones -
When connecting a headset, speaker and
gooseneck microphone will be disabled
automatically.
The PS 630 can optionally be equiped with a XLR-
6 headset connector for binaural use.
Jumpers on the front PCB board inside determine
the destination of the listen signals on the
headset.
Each listen signal of the six channels can
independantly be placed:
The headset microphone may be of the dynamic
automatically.
12 LOUDSPEAKER