Icom IC-9100 Instruction Manual - Page 86

Noise Reduction, Notch function, Dial Lock function

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5 FUNCTIONS FOR RECEIVE ■ Noise Reduction The Noise Reduction function reduces random noise components and enhances audio signals which are buried in noise. The received signals are converted to digital signals and then the audio signals are separated from the noise. q Push [NR] to turn ON the Noise Reduction. • "NR" appears. w R otate the [NR] control to adjust the noise reduction level. e P ush [NR] to turn OFF the Noise Reduction. • "NR" disappears. A large rotation of the [NR] control results in audio signal masking or distortion. Set the [NR] control for maximum readability. ■ Dial Lock function The Dial Lock function prevents frequency changes by accidental movement of [MAIN DIAL] by electronically locking it. ➥ Hold down [SPEECH/LOCK] to turn the Dial Lock function ON or OFF. • " " appears when the function is ON. NOTE: When the "[SPEECH/LOCK] SW" item is set to "LOCK/SPEECH" in the Set mode, pushing [SPEECH/LOCK] turns ON the Dial Lock function. (p. 164) ■ Notch function (Mode = Auto notch : SSB/AM/FM Manual notch : SSB/CW/RTTY/AM) This transceiver has Auto and Manual Notch functions. The Auto Notch function uses DSP to automatically attenuate beat tones, tuning signals, etc., even if their frequencies are changing. The Manual Notch function allows you to manually attenuate a frequency via the [NOTCH] control. ➥ In the SSB or AM mode, push [NOTCH] to toggle the Notch function between auto, manual and OFF. • Either the Auto or Manual notch function can be turned OFF in the Set mode. (p. 165) ➥ In the CW or RTTY mode, push [NOTCH] to turn the Manual Notch function ON or OFF. ➥ In the FM mode, push [NOTCH] to turn the Auto Notch function ON or OFF. • "MNF" appears when the Manual Notch function is ON. • "ANF" appears when the Auto Notch function is ON. • No indicator appears when the notch filter is OFF. • W hen the Manual Notch function is ON, hold down [NOTCH] for 1 second to select the wide, mid, or narrow manual notch filter width. 77 [NR] [NR] control Noise reduction OFF Noise components Noise reduction ON Desired signal (CW) [SPEECH/LOCK] [NOTCH] control [NOTCH] While tuning the manual notch filter, noise may be heard. This comes from the DSP unit and does not indicate an equipment malfunction.

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77
5
FUNCTIONS FOR RECEIVE
■
Noise Reduction
The Noise Reduction function reduces random noise
components and enhances audio signals which are
buried in noise. The received signals are converted
to digital signals and then the audio signals are sepa-
rated from the noise.
q
Push [NR] to turn ON the Noise Reduction.
• “NR” appears.
w
Rotate the [NR] control to adjust the noise reduc-
tion level.
e
Push [NR] to turn OFF the Noise Reduction.
• “NR” disappears.
A large rotation of the [NR] control results in audio
signal masking or distortion. Set the [NR] control for
maximum readability.
■
Notch function
(Mode = Auto notch
: SSB/AM/FM
Manual notch : SSB/CW/RTTY/AM)
This transceiver has Auto and Manual Notch functions.
The Auto Notch function uses DSP to automatically
attenuate beat tones, tuning signals, etc., even if their
frequencies are changing. The Manual Notch function
allows you to manually attenuate a frequency via the
[NOTCH] control.
➥
In the SSB or AM mode, push [NOTCH] to toggle
the Notch function between auto, manual and OFF.
• Either the Auto or Manual notch function can be turned
OFF in the Set mode. (p. 165)
➥
In the CW or RTTY mode, push [NOTCH] to turn
the Manual Notch function ON or OFF.
➥
In the FM mode, push [NOTCH] to turn the Auto
Notch function ON or OFF.
• “MNF” appears when the Manual Notch function is ON.
• “ANF” appears when the Auto Notch function is ON.
• No indicator appears when the notch filter is OFF.
• When the Manual Notch function is ON, hold down
[NOTCH] for 1 second to select the wide, mid, or narrow
manual notch filter width.
■
Dial Lock function
The Dial Lock function prevents frequency changes by
accidental movement of [MAIN DIAL] by electronically
locking it.
➥
Hold down [SPEECH/LOCK] to turn the Dial Lock
function ON or OFF.
•“
” appears when the function is ON.
NOTE:
When the “[SPEECH/LOCK] SW” item is set
to “LOCK/SPEECH” in the Set mode, pushing
[SPEECH/LOCK] turns ON the Dial Lock function.
(p. 164)
[NR] control
[NR]
[SPEECH/LOCK]
[NOTCH] control
[NOTCH]
While tuning the manual notch filter, noise may
be heard. This comes from the DSP unit and
does not indicate an equipment malfunction.
Noise reduction ON
Noise reduction OFF
Desired
signal (CW)
Noise components