Page 16
Speaker Mute Level Control
This knob adjusts the speaker level when any talk is active at the panel. This
function helps prevent possible feedback. The maximum amount of muting is 15
dB below full volume. If the rear-panel control is set below that level, then muting
will have no effect. When shipped from the factory, the mute level is adjusted to
provide a -6dB attenuation.
Page Override Level Control
This knob adjusts the page override level. Page Override is a special function in
the panel in which the intercom volume defaults to a preset a value or the current
front-panel volume control setting (whichever is higher) when commanded to by
the central matrix. Any fixed group can be assigned the page-override function
through the configuration program. When shipped from the factory, the page
override level is adjusted to the equivalent of half volume.
Headset Microphone Sidetone Control
This knob adjusts the h
eadset sidetone level. Sidetone is the sound of the user’s
voice in his headset. When shipped from the factory, the sidetone is adjusted for
maximum sidetone.
Headset and Panel Microphone Gain Controls
These knobs adjust the gain of the headset and panel microphones. The
preamplifier gain of the panel and headset microphone can be adjusted over a
range of 0 to 20 dB. When shipped from the factory, the headset microphone gain
is set to 10 dB and the panel microphone gain is set to 0 dB.
If two panels are talking to each other at the same time with the panel
microphone gain set to maximum, feedback may occur even if the Speaker Mute
(see “Speaker Mute Level Control” on page 1
-9) is set to maximum. In this case,
it will be necessary to turn the panel microphone gain down. Similarly, in some
noisy environments it may be necessary to turn the panel microphone gain down
and have the operator talk more closely into the microphone.
