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CESSNA
MODEL 172N
SECTION
7
AIRPLANE
&
SYSTEMS DESCRIPTIONS
transmitters a r e installed i s separate control of NAV and COM audio from
the NAVICOM radios. With this installation, the audio selector switches
labeled NAV, 1 and 2 select audio from the navigation receivers of the
NAVICOM radios only. Communication receiver audio i s selected by the
switches labeled COM, AUTO and BOTH. Description and operation of
these switches i s described in later paragraphs.
When the audio control panel for three transmitters i s installed, audio
from both NAV and COM frequencies i s combined, and i s selected by the
audio selector switches labeled NAVICOM, 1, 2 and 3.
COM AUTO AUDIO SELECTOR SWITCH
The audio control panel used with either one o r two transmitters
incorporates a three-position toggle switch, labeled COM AUTO, which i s
provided to automatically match the audio of the appropriate NAVICOM
communications receiver to the transmitter selected by the transmitter
selector switch. When the COM AUTO selector switch i s placed in the up
(SPEAKER) position, audio from the communications receiver selected by
the transmitter selector switch will be heard on the airplane speaker.
Switching the transmitter selector switch to the other transmitter auto-
-
.
matically switches the other communications receiver audio to the
speaker. This automatic audio switching feature may also be utilized when
listening on a headset by placing the COM AUTO switch in the down
(PHONE) position. If automatic audio selection i s not desired, the COM
AUTO selector switch should be placed in the center (OFF) position.
COM BOTH AUDIO SELECTOR SWITCH
The audio control panel used with either one or two transmitters
incorporates a three-position toggle switch, labeled COM BOTH, which i s
provided to allow both COM receivers to be monitored at the same time. For
example, if the COM AUTO switch i s in the SPEAKER position, with the
transmitter selector switch in the number one transmitter position,
number one communications receiver audio will be heard on the airplane
speaker. If it i s also desired to monitor the number two communications
receiver audio without changing the position of the transmitter selector
switch, place the COM BOTH selector switch in the up (SPEAKER)
position s o that the number two communications receiver audio will be
heard in addition to the number one communications receiver audio. This
feature can also be used when listening on a headset by placing the COM
BOTH audio selector switch in the down (PHONE) position.
NOTE
The combination of placing the COM AUTO switch in the
SPEAKER position and the COM BOTH switch in the
1
July 1979
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