Icom IC-77 Instruction Manual page 11

Basic receiving
1) Turn the [POWER] switch to the ON position.
2) Rotate the [AF] control clockwise to adjust the
desired audio output level.
RIT function
If bass or treble of receive audio is too strong, receive
signal may be off frequency. Using the RIT function,
shift the-receive frequency to obtain clear audio.
Push the [RIT] switch to turn the RIT function ON.
e "RIT" appears.
Preamp
The preamp is useful under the following conditions:
— When a receive signal is weak.
— When poor propagation conditions exist.
Push the [PREAMP/ATT] switch 1 time to turn the
preamp ON.
elf "ATT" appears, push 2 times.
e "PREAMP" appears.
Attenuator
The attenuator is useful to prevent the receive signal
from distorting under the following conditions:
— When strong signals are near the desired fre-
quency.
— When strong signal stations are near your location.
Noise blanker
The noise blanker reduces click noise generated by
vehicle ignition systems, etc.
Push the [NB] switch to turn the noise blanker ON.
e '"NB" appears.
Squelch function
For quiet standby, the squelch mutes noise when no
signal is received.
Rotate the [SQL] control to the 12 o'clock position to
mute noise, if required.
eWhen the [SQL] control is rotated too far clockwise,
weak signals cannot be received.
OPERATION 2
3) Rotate the channel selector to select a desired
channel.
4) If receive audio is not clear or includes noise, use
the functions below.
Rotate the [RIT] control.
+0 kHz
RIT
Decreases ( ) Increases
-1.2 kHz / \ +1.2 kHz
Push the [RIT] switch again to turn the RIT function
OFF.
e "RIT" disappears.
Push the [PREAMP/ATT] switch 2 times to turn the
preamp OFF.
e "PREAMP" disappears.
NOTE: When a receive signal is not weak, turn the
preamp OFF. Otherwise, suddenly appearing strong
signal may interfere with the desired signal.
Push the [PREAMP/ATT] switch 2 times to turn the
attenuator ON.
elf "PREAMP" appears, push 1 time.
e"ATT" appears.
Push the [PREAMP/ATT] switch 1 time to turn the at-
tenuator OFF.
e"ATT"' disappears.
Push the [NB] switch again to turn the noise blanker
OFF.
e "NB" disappears.
NOTE: To prevent the receive signal from distorting,
turn the preamp OFF when click noise is not received.
When the squelch is not required, rotate the [SQL]
control to the max. counterclockwise position.
Recommended position
Squelch open AFT SOL
position [SQL]
Shallow \ Deep