Auto Notch Function; Noise Reduction; Noise Blanker - Icom IC-756 Instruction Manual

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.

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.

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.
NB
Noise blanker OFF
NOTE: When using the noise blanker, received sig-
nals may be distorted if they are excessively
strong.
NB
Noise blanker ON
RECEIVE AND TRANSMIT
Auto notch OFF
Desired
signal (AF)
Unwanted tone
frequency
Noise reduction OFF
BAL NR
Noise components
[NB] switch
4
Auto notch ON
Desired
signal (AF)
Particular frequency
is attenuated
Noise reduction activated
BAL NR
Desired
signal (CW)
26