Icom IC-77 Instruction Manual page 10

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2 OPERATION
E Receiving
[RIT] switch
When bass or treble of receive au-
dio is too strong, turn the RIT func-
tion ON.
[PREAMP/ATT] switch
Used when a receive signal is weak or
when a signal is distorting. Turn the
preamp and attenuator ON or OFF ac-
cording to receiving condition.
[NB] switch
For reducing pulse-type
noise, turn the noise
blanker ON.
[RIT] control
Rotate to shift the receive frequen-
cy to obtain clear audio.
[PHONES] jack
Connect headphones, if
required.
$e Ue
[AF] control P G e
Adjusts' the. audio © output
level from the speaker.
[SQL] control
To mute noise when no
signal is received, rotate to
the 12 o'clock position.
[LOCK] switch
Electronically locks the
channel selector.
: Required operations
[|] : Convenient functions
Noise blanker indicator
Shows that the noise
blanker is ON.
Preamp indicator
Shows that the preamp is
ON.
RIT indicator
Shows that the RIT func-
tion is ON.
Attenuator indicator
Shows that the RF attenu-
ator is ON.
Receive indicator
Shows that the squelch is
open.
PREAMP ATT
S15 9 wo ff PTE
ee ee a T
PO 100
S/RF indicator
Shows the receive signal
strength.
Because of internal circuit design, a weak
beat signal may be heard near 21.484 MHz.