Cessna 172P - 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