Icom IC-820H Instruction Manual page 22

23
SQUELCH (G@, @ on pgs. 1, 2)
Rotate to close the squelch
when you want to cut the
no-signal noise in FM mode or
to eliminate the floor noise in
SSB/CW mode.
S/RF METER (@ on p. 2)
Shows the main band's
receive signal strength.
CHECK (@ on p. 3)
Monitors the frequency
without disturbing the ac-
cessed band's squelch.
The sub band S-meter can be
turned OFF using the F-set mode if
desired.
See p. 40 for setting the
sub band S-meter ON and OFF.
TX/RX INDICATOR
(® on p. 2)
Lights up in green when a
signal is received.
Blinks when an off-center
signal is received in FM
mode.
LOCK (@ on p. 3)
Push to activate the dial
lock function and to an-
nounce the accessed
band's frequency when
an optional UT-36 is in-
stalled.
RIT (@, & on pgs. 4, 6)
SHIFT (€ on p. 6)
See the right page for
details.
PHONES (@ on p. 1)
Insert headphones
when required.
ORX
TRANSMIT
N
liam
PREAMP (@ on p. 2)
When connecting an op-
tional preamplifier to an
antenna connector, this
switch turns the preamp
ON and OFF.
SCAN
(@ on p. 4)
Push to start the
scan or optional
tone scan.
ATT (@ on p. 2)
When receiving interference from strong signals
or other
sources,
the attenuator
is helpful to
reduce the interference.
See p. 40 for activating
band selection.
AGC (@ on p. 2)
during fluctuations in main band signal strength.
e Set AGC slow (OUT) for SSB mode.
e Set AGC fast (IN) for CW mode or when searching
for signals with the tuning dial.
NB (@ on p. 2)
When operating SSB or CW mode on the main band,
pulse-type noise may be received, such as from car
ignitions.
In this case, the noise blanker eliminates
such noise.
available for FM mode.