phone
to the radio
unit
the pilot
desires
to use for transmission. This is
acconplished by placing the transmitter
selector
switch in the position
corresponding to the radio
unit
which is to be used. The up position
selects
the upper transmitter and the down position
selects
the lower
transmitter.
The installation of
Cessna
radio equipment provides certain audio
back-up capabilities and transmitter
selector
switch functions
that
the
pilot
should be
familiar
with.
When the transmitter
selector
switch is
placed in position 1 or 2, the audio amplifier of the corresponding trans-
ceiver is
utilized
to provide the
speaker
audio for all radios. If the audio
amplifier
in the
selected
transceiver fails, as
evidenced
by
loss
of
speaker
audio for all radios,
place
the transmitter
selector
switch in the other
transceiver position.
Since
an audio amplifier is not
utilized
for head-
phones,
a malfunctioning amplifier
will
not affect
headphone
operation.
SPEAKER
PHONE
SWITCHES.
The
speaker-phone
switches determine whether the output of the
receiver in use is fed to the
headphones
or through the audio amplifier
to the speaker.
Place
the switch for the desired receiving system either
in
the up position for
speaker
operation or in the down position for head-
phones.
AUTOPILOT-OMNI
SWITCH.
When a Nav-O-Matic autopilot is installed
with
two compatible omni
receivers, an autopilot-omni switch is
utilized.
This switch
selects
the
omni
receiver to be used for the omni
course
sensing function of the auto-
pilot.
The up position
selects
the upper omni receiver in the radio panel
stack and the down position
selects
the lower omni receiver.
BOOM
MICROPHONE
A
boom
microphone may be moimted near the upper left corner of
the
windshield. Use of the
boom
microphone allows radio communication
without
the
necessity
of releasing any controls to handle the normal hand
microphone. The microphone keying switch is a push button located on
the
left
side
of the pilot's control wheel.
7-4
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