to the
transmitter
the pilot
has selected for use.
To
accomplish this, in-
terlocking transmitter selector
switches
labeled
"TR
1"
and "TR
2'"
are
provided.
"TR
1"
selects the
upper
transmitter
and "TR
2"
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
labeled
"TR
1"
or
"TR 2"
is
depressed,
the audio
amplifier
of
the
corres-
ponding
transceiver
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, depress
the
transmitter selector
switch
for
the
transceiver
not in
use.
Since an audio
amplifier
is
not
utilized for
headphones,
a
malfunctioning
amplifier
will not
affect
head-
phone operation.
SPEAKER-PHONE
SWITCHES.
The speaker-phone switches such
as
"COM 1", "NAV
1'""
(400
series
radios), or
"REC
1",
"REC
2" (300
series
radios) determine
whether the
output
of
the
receiver
in
use
is
fed to the headphones
or
through the audio
amplifier
to the
speaker. Depress
the switch
for
the
desired receiver
to
obtain
speaker
operation,
or release it
if headphone operation
is
desired.
AUTOPILOT-OMNI
SWITCH.
When
a Nav-O-Matic autopilot
is installed
with
two
compatible
omni
receivers,
two
autopilot-omni switches
labeled
"AP
1"
and "AP
2"
are
utilized.
These switches
select
the omni
receiver
to be used
for
the omni
course
sensing function
of
the autopilot. This
is
accomplished
by
depress-
ing the
selector
switch
corresponding
to the
receiver
which
is
to
be
used.
BOOM
MICROPHONE
A
boom microphone may
be
mounted
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
lo-
cated on the left side
of
the
pilot's control
wheel.
Summary of Contents for 182 1973
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