Icom IC-756 - Manual (Page 29)

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4
RECEIVE AND TRANSMIT
■ Auto notch function
The auto notch function automatically attenuates
more than 3 beat tones, tuning signals, etc., even if
they are moving.
The auto notch functions in SSB mode only.
q Select SSB mode.
w Push [AUTO NOTCH] to turn the auto notch func-
tion ON.
e Push [AUTO NOTCH] again to cancel the function.
Unwanted tone
frequency
Desired
signal (AF) Desired
signal (AF)
Particular frequency
is attenuated
Auto notch OFF Auto notch ON
■ Noise reduction
The noise reduction function reduces noise compo-
nents and picks out desired signals which are buried
in noise. The received AF signals are converted to
digital signals and then the desired signals are sepa-
rated from the noise.
q Push the [NR] switch to turn the noise reduction
ON.
- [NR] indicator lights.
w Rotate the [NR] control to adjust the noise reduc-
tion level.
e Push the [NR] switch to turn the noise reduction
OFF.
- [NR] indicator does not light.
Deep rotation of the [NR] control results in audio
signal masking or distortion. Set the [NR] control
for maximum readability. The noise reduction func-
tion is not available in AM and FM modes.
BAL NR
Noise reduction OFF Noise reduction activated
Desired
signal (CW) Noise components
BAL NR
■ Noise blanker
The noise blanker eliminates pulse-type noise such
as from car ignitions. The noise blanker is not avail-
able for FM mode.
• Push the [NB] switch to turn the noise blanker ON or
OFF.
NOTE: When using the noise blanker, received sig-
nals may be distorted if they are excessively
strong.
[NB] switch
Noise blanker OFF Noise blanker ON
NB NB