Selecting The If Filter - Icom IC-9700 Basic Manual

4
RECEIVING AND TRANSMITTING

Selecting the IF filter

SSB, CW, RTTY and AM modes
The IC-9700 has 3 IF filter passband widths for each
mode, and you can select them on the FILTER screen.
You can set the IF filter 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 to select the passband width.
MAIN DIAL
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
Selecting the IF filter shape
SSB, CW, RTTY and AM modes
You can set the IF filter 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).
When [SOFT] is selected
5. Touch [SHARP] or [SOFT].
6. To close the FILTER screen, push
SSB
SSB-D
CW
RTTY
AM
AM-D
FM
FM-D
DV
Touch for 1
second to reset
to default.
DD
TIP: When you set the IF filter to FIL2 or FIL3 in the FM
mode, the transceiver will transmit in the FM narrow mode.
.
EXIT
• SHARP
• SOFT
.
EXIT
4-4
Mode IF filter
FIL 1 (3.0 kHz)
FIL 2 (2.4 kHz)
FIL 3 (1.8 kHz)
FIL 1 (3.0 kHz)
FIL 2 (1.2 kHz)
FIL 3 (500 Hz)
FIL 1 (1.2 kHz)
FIL 2 (500 Hz)
FIL 3 (250 Hz)
FIL 1 (2.4 kHz)
FIL 2 (500 Hz)
FIL 3 (250 Hz)
FIL 1 (9.0 kHz)
FIL 2 (6.0 kHz)
FIL 3 (3.0 kHz)
FIL 1 (15 kHz)
FIL 2 (10 kHz)
FIL 3 (7.0 kHz)
FIL 1 (15 kHz)
FIL 2 (10 kHz)
FIL 3 (7.0 kHz)
FIL 1 (150 kHz) Fixed
This selection is to emphasize the passband width of
the filter. The filter has an almost ideal shape factor.
Signals that are out of the passband are extremely
filtered out, and it gives you better audio quality.
The filter shoulders are roundly formed as in analog
filters. This decreases noise components in the
high and low frequencies of the filter 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.
Selectable range (steps)
50 Hz to 500 Hz (50 Hz)/
600 Hz to 3.6 kHz (100 Hz)
50 Hz to 500 Hz (50 Hz)/
600 Hz to 3.6 kHz (100 Hz)
50 Hz to 500 Hz (50 Hz)/
600 Hz to 3.6 kHz (100 Hz)
50 Hz to 500 Hz (50 Hz)
600 Hz to 2.7 kHz (100 Hz)
200 Hz to 10.0 kHz (200 Hz)
Fixed
Fixed