Cessna 152 - Page 136

SECTION7
CESSNA
MODEL
152
AIRPLANE
&
SYSTEMS
DESCRIPTIONS
transmitter.
This
can
be
verified
by
switching
to
the
speaker
function.
AUDIO
SELECTOR SWITCHES
Both
audio
control
panels
(see
figure
7-10)
incorporate
an
individual
three-position,
toggle-type
audio
selector
switch
for
each
NAV/COM
or
ADF
radio
installed
in
the
airplane.
These
switches
allow
the
audio
of
any
receiver
to
be
directed
to
the
airplane
speaker
or
to
the
headset
individu-
ally.
To
hear
the
audio
of
any
particular
receiver
over
the
airplane
speaker,
place
the
audio
selector
switch
associated
with
that
receiver
(NA
V / COM
or
ADF)
in
the
up
(SPEAKER)
position.
To
listen
to
the
receiver
through
the
headset,
place
the
appropriate
audio
selector
switch
in
the
down
(PHONE)
position.
To
tum
off
the
audio
on
that
receiver,
place
the
audio
selector
switch
in
the
center
(OFF)
position.
Thus,
any
NA
V / COM
or
ADF
receiver
may
be
heard
singly
or
in.
combination
with
other
receivers,
either
over
the
airplane
speaker
or
the
headset.
AUTOMATIC
AUDIO
SELECTOR SWITCH
If
the
airplane
is
equipped
with
an
audio
control
panel
having
marker
.beacon
controls,
a
toggle
switch,
labeled
AUTO,
is
provided
and
can
be
used
to
automatically
match
the
appropriate
NA
V / 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
NA
V / 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.
7-34
NOTE
Cessna
radios
a.re
equipped
with
sidetone
capability
(monitoring
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
potenti-
ometer
located
inside
the
audio
control
panel.
During
adjustment,
be
a.ware
that
if
the
sidetone
level
is
set
too
high
it
can
ca.use
audio
feedback
(squeal)
when
transmit-
ting.
Headphone
sidetone
level
adjustment
to
accommo-
date
the
use
of
the
different
type
headsets
is
accomplished
by
adjusting
potentiometers
in
the
NA
V
/COM
radios.
1
July
1978