Icom IC-78, Инструкция по эксплуатации, Страница: 21 / 48

4
OPERATION
19
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Functions for receive
ï RIT function
The RIT (Receive Incremental Tuning) function com-
pensates for off-frequencies of communicating sta-
tions. The function shifts the receive frequency up to
1.2 KHz without moving the transmit frequency.
q
Rotate the RIT control to cancel the off-frequen-
cies.
• “ ” appears on the display.
• The transmit frequencies are not shifted.
w
To cancel the RIT function,
rotate the RIT control to the
center position.
• “ ” disappears.
ï
Preamp
The preamp amplifies received signals in the front
end circuit to improve the S/N ratio and sensitivity.
Turn this function ON when receiving weak signals.
➥
Push [P.AMP] to turn the the preamp ON and OFF.
• Preamp functions below 1.6 MHz, but sensitivity may
be reduced in some cases.
Appears when the
preamp is ON.
ï
Attenuator
The attenuator prevents desired signals from distort-
ing when very strong signals are near the desired fre-
quency or when very strong electric fields, such as
from broadcasting stations, are near your location.
➥
Push [ATT] to turn the 20 dB attenuator function
ON and OFF.
• “ATT” appears when the attenuator is turned ON.
Appears when the
attenuator is ON.
RIT off position
ï
Noise blanker
The
noise blanker reduces pulse-type noise such as
that generated by automobile ignition systems.
q
Push the [NB] switch to turn the noise blanker ON.
• [NB] indicator appears.
w
Push the [NB] for 1 sec. to enter the noise blanker
level setting condition.
e
Rotate the channel selector to adjust the noise
blanker level.
r
Push [NB] to exit the setting condition.
t
Push [NB] again to turn the noise blanker function
OFF.
• [NB] indicator disappears.
• When using the noise blanker, received signals
may be distorted if they are excessively strong.
• The noise blanker function in AM mode can be
deactivated depending on initial set mode setting.
(p. 31)
[NB] switch
Appears when the
noise blanker is ON.