Transmitter Selector Switch; Automatic Audio Selector Switch - Cessna 182Q 1979 Pilot Operating Handbook

SECTION 7
AIRPLANE
&
SYSTEMS DESCRIPTIONS
CESSNA
MODEL 182Q
system is provided (see figure 7-10). The operation of this switching
system is described in the following paragraphs.
TRANSMITIER SELECTOR SWITCH
A rotary type transmitter selector switch, labeled XMTR SEL, is
provided to connect the microphone to the transmitter the pilot desires to
use. To select a transmitter, rotate the switch to the number corresponding
to that transmitter. The numbers 1,2 and 3 above the switch correspond to
the top, second and third transceivers in the avionics stack.
The audio amplifier in the NAV / COM radio is required for speaker and
transmitter operation. The amplifier is automatically selected, along with
the transmitter, by the transmitter selector switch. As an example, if the
number 1 transmitter is selected, the audio amplifier in the associated
N A V / COM receiver is also selected, and functions as the amplifier for ALL
speaker audio. In the event the audio amplifier in use fails, as evidenced by
loss of all speaker audio and transmitting capability of the selected
transmitter, select another transmitter. This should re-establish speaker
audio and transmitter operation. Since headset audio is not affected by
audio amplifier operation, the pilot should be aware that, while utilizing a
headset, the only indication of audio amplifier failure is loss of the selected
transmitter. This can be verified by switching to the speaker function.
AUTOMATIC AUDIO SELECTOR SWITCH
A toggle switch, labeled AUTO, can be used to automatically match the
appropriate NAV / COM receiver audio to the transmitter being selected.
To utilize this automatic feature, leave all NAV / COM receiver switches in
the OFF (center) position, and place the AUTO selector switch in either the
SPEAKER or PHONE position, as desired. Once the AUTO selector switch
is positioned, the pilot may then select any transmitter and its associated
NAV /COM receiver audio simultaneously with the transmitter selector
switch. If automatic audio selection is not desired, the AUTO selector
switch should be placed in the OFF (center) position.
NOTE
Cessna radios are equipped with sidetone capability (mon-
itoring of the operator's own voice transmission). Sidetone
will be heard on either the airplane 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 radio selector
switches. Adjustment of speaker sidetone volume is
accomplished by adjusting the sidetone potentiometer
located inside the audio control panel. During adjustment,
7-38
1 October 1978