Annunciator Lights Brightness And Test Switch; Sidetone Operation - Cessna 1980 182Q Pilot's Operating Handbook And Flight Manual

CESSNA
MODEL
182Q
SECTION 7
AIRPLANE
&
SYSTEMS DESCRIPTIONS
NOTE
If the NAV/COM audio selector switch corresponding to
the selected transmitter is in the PHONE position with the
AUTO selector switch in the SPEAKER position, all audio
selector switches placed in the PHONE position will
automatically be connected to both the airplane speaker
and any headsets in use.
ANNUNCIATOR LIGHTS BRIGHTNESS AND TEST SWITCH
The audio control panel used with either one or two transmitters
incorporates a three-position toggle-type switch to control the brightness
level of the marker beacon indicator lights (and certain other annunciator
lights associated with avionics equipment). When the switch is placed in
the center (DAY) position, the indicator lights will show full bright. When
this switch is placed in the up (NITE) position, the lights are set to a
reduced level for typical night operations and can be further' adjusted
using the RADIO LT dimming rheostat knob. The down (TEST) position
illuminates all lamps (except the ARC light in the NAV indicators) which
are controlled by the switch to the full bright level to verify lamp opera-
tion.
SIDETONE OPERATION
Cessna radios are equipped with sidetone capability (monitoring of
the operator's own voice transmission). While adjusting sidetone, be
aware that if the sidetone volume level is set too high, audio feedback
(squeal) may result when transmitting.
When the airplane has one or two transmitters, sidetone is provided in
both the speaker and headset any time the COM AUTO selector switch is
utilized. Placing the COM AUTO selector switch in the OFF position will
eliminate sidetone. Sidetone internal adjustments are available to the pilot
through the front of the audio control panel (see figure 7-10). Adjustment
can be made by removing the appropriate plug-button from the audio
control panel (left button for headset adjustment and right button for
speaker adjustment), inserting a small screwdriver into the adjustment
potentiometer and rotating it clockwise to increase the sidetone volume
le"l."el.
When the airplane has three transmitters, sidetone will be heard on
either the speaker or a headset as selected with the AUTO selector switch.
Sidetone may be eliminated by placing the AUTO selector switch in the
OFF position. and utilizing the individual audio selector switches. Adjust-
ment of speaker and headset sidetone volume can only be accomplished by
adjusting the sidetone potentiometers located inside the audio control
panel.
1 October 1979 7-41