Icom IC-9700 - Selecting the if Filter

4
RECEIVING AND TRANSMITTING
4-4
Selecting the IF lter
SSB, CW, RTTY and AM modes
T
he IC-9700 has 3 IF lter passband widths for each
mode, and you can select them on the FILTER screen.
You can set the IF lter to wide (FIL 1), mid (FIL 2) or
narrow (FIL 3).
1. Select the operating mode. (Example: USB)
2. Touch the filter icon for 1 second.
• Opens the FILTER (SSB) screen.
3. Touch the filter icon several times to select FIL 1
(wide), FIL 2 (mid) or FIL 3 (narrow).
4. Touch [BW ].
• Selects the passband width mode.
5. Rotate
MAIN DIAL
to select the passband width.
L You cannot change the passband width in the FM,
FM-D, DV or DD mode.
L When you change the passband width, the Digital
Twin PBT setting value is reset to the center position.
L “BPF” is displayed when a band width less than 500
Hz is selected in the SSB, CW or RTTY mode.
6. To close the FILTER screen, push
EXIT
.
Touch for 1
second to reset
to default.
TIP: When you set the IF lter to FIL2 or FIL3 in the FM
mode, the transceiver will transmit in the FM narrow mode.
Mode IF lter Selectable range (steps)
SSB
FIL 1 (3.0 kHz)
50 Hz to 500 Hz (50 Hz)/
600 Hz to 3.6 kHz (100 Hz)
FIL 2 (2.4 kHz)
FIL 3 (1.8 kHz)
SSB-D
FIL 1 (3.0 kHz)
50 Hz to 500 Hz (50 Hz)/
600 Hz to 3.6 kHz (100 Hz)
FIL 2 (1.2 kHz)
FIL 3 (500 Hz)
CW
FIL 1 (1.2 kHz)
50 Hz to 500 Hz (50 Hz)/
600 Hz to 3.6 kHz (100 Hz)
FIL 2 (500 Hz)
FIL 3 (250 Hz)
RTTY
FIL 1 (2.4 kHz)
50 Hz to 500 Hz (50 Hz)
600 Hz to 2.7 kHz (100 Hz)
FIL 2 (500 Hz)
FIL 3 (250 Hz)
AM
AM-D
FIL 1 (9.0 kHz)
200 Hz to 10.0 kHz (200 Hz)FIL 2 (6.0 kHz)
FIL 3 (3.0 kHz)
FM
FM-D
FIL 1 (15 kHz)
FixedFIL 2 (10 kHz)
FIL 3 (7.0 kHz)
DV
FIL 1 (15 kHz)
FixedFIL 2 (10 kHz)
FIL 3 (7.0 kHz)
DD FIL 1 (150 kHz) Fixed
Selecting the IF lter shape
SSB, CW, RTTY and AM modes
You can set the IF lter shape for each operating mode.
1. Select the operating mode. (Example: USB)
2. Touch the filter icon for 1 second.
3. Opens the FILTER screen.
4. Touch the filter icon several times to select FIL1
(wide), FIL2 (mid) or FIL3 (narrow).
5. Touch [SHARP] or [SOFT].
6. To close the FILTER screen, push
EXIT
.
When [SOFT] is selected
• SHARP
This selection is to emphasize the passband width of
the lter. The lter has an almost ideal shape factor.
Signals that are out of the passband are extremely
ltered out, and it gives you better audio quality.
• SOFT
The lter shoulders are roundly formed as in analog
lters. This decreases noise components in the
high and low frequencies of the lter passband,
and increases the S/N of the target signal. These
characteristics play an effective role in picking up
very weak signals in the 50 MHz band, for example.
The shape factor is kept, and the sharpness of the
bandpass is excellent.