Cessna 172P Pilot's Operating Handbook And Flight Manual page 294

13
gSB
HF TR,ANBCEIVER
(TYPE
ASB-12õ)
PILOT'S OPER,ATING ÉIANDBOOK
SUPPIJEMEÌqf
2
2
76
5
4
3
1.
CHANNEL
WINDOW
-
Displays
select€d ohennel,
2. RELATM
POWER,
METER
-
Indicetea rel¿tive radiated
power
of
the power
a,mplifier/
ertenne
Fystem.
3,
MODE SELECTOR
CONTROL
-
Seleots one of the
doslred
operating
modes:
USB
-
Seleots upper eideband operatlou for loug range voice
communlca-
tions.
AM - goleots
oompetible AM operatlon
and
full AM
reoeptlon,
TEL -
Seleote
upper
sldebend
with
reduced
oarrier,
used
for public
correa-
pond€noe telephone and ship-to-shore.
LgB
- (Optional)
Selects
lower
eideband
operation
(not legal in
U,S,,
Cauoda etrd moÊt
othe¡ countrles).
4.
SQUELCH
CONTROL
-
Used
to
adjust slgnal threshold necessary
to
activate
reoelver audio, Clookwlso
rotation
lncreases baokground
noise
(deoreases
squeloh
action); oounterclookwise
rotation
decreasss
beckground
noise.
5.
CLARIFIEH, CONTROL
-
Usod
to "clarlfy"
elngle sideband
speoch
during
receive
wbile in
USB mode only,
8.
CHANNEL
SELECTOR CONTROL
-
Selects desired cha,nnel.
Also
selocts AM
mode
if
cha,nnol
frequency
iÊ
2003
kHz,
2L821¡IIz or
2638
kHz.
7.
ON
-
AUDIO CONTROL
-
Turns
sot
ON
and
controls receiver
audio gain
Figure
1.
SSB
HF Transceiver Operating Controls
30
May
1980