Northern Airborne Technology 3110 - Manual (Page 58)

3110-100 Audio Control Panel Manual SM3110 Rev. 4.00
3.3.8
MUTE (Marker Beacon Mute) Selector
The Marker Beacon Mute Selector is a momentary pushbutton control for
selection of marker beacon muting. When the MUTE button is pushed,
marker receive audio is muted for approximately 30 seconds.
Marker audio can be muted only when the MKR receive audio control is on (see section
3.3.3). If the marker audio is muted, turning the MKR receiver control off and then on
will unmute the marker audio.
3.3.9 SPKR (Speaker) Control
The SPKR control is a black, illuminated, push-on/push-off rotary knob that
is used to control the speaker audio, and to adjust the speaker volume.
When the SPKR control is in the OUT position, the speaker audio is turned on and the
arrow on the knob is illuminated. Rotating the control adjusts the volume of the speaker
audio, which is a mix of all receiver, interphone (if OXY MIC is selected), and radio
sidetone sources, adjusted for their individual volume and ON/OFF selections.
When the SPKR control is in the IN position, the speaker audio is turned off.
3.3.10 HDPH (Headphone) Control
The HDPH control is a black rotary knob used for adjusting the pilot’s
headphone audio volume.
The control is rotated ccw to reduce the volume, and cw to increase it.
The headphone audio consists of a mix of all receiver, interphone, and sidetone
sources, adjusted for their individual volume selections and ON/OFF selections.
3.3.11 Power Off Emergency Mode
There are two ways in which the 3110-100 can enter Emergency Mode. It will
automatically switch to emergency mode during power-off conditions, or it may be
selected by a separate external switch (See section 3.4.1). The 3110-100 can be linked
to an external indicator to display emergency mode status in either of these conditions.
One transceiver and one aural warning source may be connected for use in emergency
mode. The transceiver is connected to the boom/mask mic audio, radio PTT keyline and
pilot headphones, and the aural warning source is connected to the pilot headphone.
The CVR output contains the pilot headphone audio, which is a sum of the tranceiver's
audio and the aural warning audio.
Without power, the speaker, receiver/transmitter selections, and all other front panel
operations are effectively disabled.
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