10 VOLUME control knobs 13 CALL A & B buttons
These knobs adjusts the listen level for the headset. These push buttons activate the CALL system.
Each channel can be adjusted separately. A momentary push will send a CALL signal to all
11 SIDETONE trimmers
These trimmers adjust the level of your own voice as Press and hold the buttons for 2 seconds will activate
you hear it in your headset. the call buzzer, if not muted.
Adjustment procedure : After the CALL button is released the LEDS will
- set the trimmer in start position: fully clockwise. continue to flash for a further 2 seconds.
- switch off the microphone of all connected
(speaker!) stations.
- switch on the microphone of the required channel. A XLR-4 type connector for the connection of the local
- turn up the volume of the required channel. headset. This must have a can impedance of 200
- speak into the headset microphone. ohms (or greater), or each 400 ohms minimum when in
- adjust the listen level by turning the sidetone parallel. The mic may be of the dynamic or electret
trimmer. type.
The operating area is between fully clockwise and
minimum level. Adjusting the sidetone does not affect Pin assignments:
the level of your voice as it is heard by other stations. 1. shield mic. (GND)
12 TALK buttons
These buttons allow you to talk to each channel 4. phones -
separately or simultaneously.
The large green LED indicates if the talk function is The wiring is such that both headset cans are
activated. connected in parallel and receive the same signal. The
Latched switching:
When a TALK button is momentarily pressed, the As an option, a XLR-6 type connector can be fitted to
microphone will be switched on for the chosen channel give a binaural headset configuration where a different
and is electronically latched. When pressed again, the signal will appear on each can. In this mode the
microphone will be switched off. internal headphone amplifiers are not bridged.
Momentary switching:
When a TALK button is pressed and held, the
microphone will be switched on, and when released,
will be switched off.
stations connected to that intercom channel and the
CALL LEDS will start flashing.
14 HEADSET connector
2. mic. +
3. phones +
two headphone amplifiers run in a bridged mode.
See section 7.1 Internal Jumpers and Controls.