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B400 Functional Description 4.21
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The internal oscillator may be set to one of 4 different frequencies by the FREQ
switch, ranging from 100 to 10kHz
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The ON switch enables the oscillator when pressed and illuminates to indicate
that the oscillator is active. The oscillator bus is however muted when the Master
Module ON AIR switch is pressed, but it should be noted that the ON switch
will remain illuminated, if selected, to indicate that the oscillator will be available
as soon as ON AIR status is turned off.
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The mono oscillator signal is routed through the CAL(calibrate) preset control.
This should not require adjustment under normal circumstances. The calibrated
signal is routed to the internal tone bus and also to two sets of balanced outputs
which are available on the rear connector panels EDAC connector (OSC L and
OSC R).
The LEVEL control adjusts the final output level.
An EBU TONE facility is available on the OSC L output, which switches off the
output for 100msec every 3 seconds (nominal times) when the button is pressed.
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The oscillator signal may be routed to the main Stereo output (ST pressed) or to
the Groups (GRPS pressed).
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Pressing the TONE switch routes the oscillator signal to the Direct Output of
every input module.
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Pressing the TALK switch routes the talkback signal to the Direct Output of
every input module.
Note: Pressing both the TONE and TALK switches together will route the talk-
back signal and tone to the Direct Output of every input module, but the oscilla-
tor frequency will be automatically set to 30Hz.
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Two switches, OPTION 1 and OPTION 2, are provided to give you the option of
remote control of external devices/ lamps etc. A pair of normally-open contacts
from each switch are made available via the External Logic D-type connector on
the rear panel.
Under no circumstances should mains voltages be placed
on these contacts.
In addition each switch has a pair of talkback contacts which are available on the
Comms Module EDAC.