Optional Noise Reduction Function; Optional Auto Notch Function - Icom IC-R75 Instruction Manual

5
RECEIVE FUNCTIONS

Optional noise reduction function

When an optional UT-106 is installed (DSP appears
in the function display), noise reduction function can
be used.
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 [NR] to turn the noise reduction ON.
• [NR] indicator appears.
w Push [NR] for 2 sec. to enter the noise reduction
level setting condition.
e Rotate the tuning dial to adjust the noise reduction
level.
r Push [NR] to exit the setting condition.
t Push [NR] again to turn the noise reduction OFF.
• [NR] indicator disappears.

Optional auto notch function

When an optional UT-106 is installed (DSP appears
in the function display), an auto notch function can be
used.
The function automatically attenuates more than 3
beat tones, tuning signals, etc., even if they are mov-
ing.
The auto notch functions in SSB mode only.
q Select SSB mode.
w Push [ANF] to turn the auto notch function ON.
• [ANF] indicator appears.
e Push [ANF] again to cancel the function.
• [ANF] indicator disappears.
20
• Noise reduction example
Noise reduction OFF
Noise components
Higher setting of the [NR] level results in audio sig-
nal masking or distortion. Set the [NR] level for
maximum clarity. The noise reduction function is
available in all modes, including AM and FM
modes.
Auto notch OFF
Desired
signal (AF)
Unwanted tone
frequency
optional UT-106
Noise reduction activated
Desired
signal (CW)
optional UT-106
Auto notch ON
Desired
signal (AF)
Particular frequency
is attenuated