Icom IC-905, Основное руководство

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4-9
BASIC MANUAL
RECEIVING AND TRANSMITTING
4
4
Noise Reduction
SSB, CW, RTTY, AM, FM, DV, and ATV modes
The Noise Reduction function reduces random noise
components and enhances signal audio.
1. Push .
• Opens the FUNCTION screen.
2. Touch [NR].
L
Touching [NR] turns this function ON or OFF.
3. To close the FUNCTION screen, push .
D
Adjusting the Noise Reduction level
Adjust the Noise Reduction level to where noise is
reduced but the received signal is not distorted.
1. Push .
• Opens the FUNCTION screen.
2. Touch [NR] for 1 second.
• Turns ON the Noise Reduction function and opens
the NR menu.
3. Rotate to adjust the Noise Reduction
level to between 0 and 15.
L
Adjust to a higher level to increase the reduction
level, and a lower level to decrease it.
4. To close the NR menu, push .
Setting the transmit filter width
SSB mode
The transmit filter width for the SSB and SSB-D
modes can be set. WIDE (wide), MID (mid), or NAR
(narrow) can be selected only in the SSB mode.
L
The filter settings are memorized for both the ON and
OFF states of the Compressor function.
To change the filter width in the SSB mode:
1. Set the operating mode to USB or LSB.
2. Push .
• Opens the FUNCTION screen.
3. Touch [TBW].
L
Touching [TBW] sets the filter width to WIDE, MID, or
NAR.
The transmit filter widths are set to the following
values by default.
• SSB (WIDE): 100 Hz to 2900 Hz
• SSB (MID): 300 Hz to 2700 Hz
• SSB (NAR): 500 Hz to 2500 Hz
• SSB-D: 300 Hz to 2700 Hz
L
You can change the filter width values in the
following settings.
»
SET > Tone Control/TBW > TX > SSB >
TBW (WIDE)
»
SET > Tone Control/TBW > TX > SSB >
TBW (MID)
»
SET > Tone Control/TBW > TX > SSB >
TBW (NAR)
»
SET > Tone Control/TBW > TX > SSB-D >
TBW
Displayed
when the Noise
Reduction
function is ON.
NR is OFF
NR level 0
NR is ON
NR level 4
Noise components Desired signal (CW)