Icom IC-7610 Instruction Manual basic - Page 34

Selecting the IF filter, SHARP

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4 RECEIVING AND TRANSMITTING Selecting the IF filter The transceiver 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 FIL 1 (wide), FIL 2 (mid) or FIL 3 (narrow). 1. Select the operating mode. (Example: USB) 2. Hold down FILTER for 1 second. ••Opens the FILTER screen. 3. Touch 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. LYou cannot change the passband width in the FM or FM-D mode. LWhen you change the passband width, the Twin PBT setting value is reset to the center position. Displayed when the selected band width is 500 Hz or narrower, in the SSB or CW mode. Mode SSB SSB-D CW PSK RTTY AM AM-D FM FM-D IF filter FIL 1 (3.0 kHz) FIL 2 (2.4 kHz) FIL 3 (1.8 kHz) 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) 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 2.7 kHz (100 Hz) 200 Hz to 10.0 kHz (200 Hz) Fixed Selecting the IF filter shape You can independently set the DSP filter shape to soft or sharp for each operating mode. 1. Set the operating mode to SSB or CW. (Example: USB) 2. Hold down FILTER for 1 second. ••Opens the FILTER screen. 3. Select FIL1 (wide), FIL2 (mid) or FIL3 (narrow). 4. Touch [SHARP] or [SOFT]. Touch for 1 second to reset to default 5. To close the FILTER screen, push EXIT . 6. Touch [BW]. ••Cancels the passband width mode. 7. Repeat steps 3 to 5 to set the passband width for other modes except for the FM and FM-D modes. 8. To close the FILTER screen, push EXIT . TIP: When you set the IF filter to FIL2 or FIL3 in the FM mode, the transceiver will transmit in the FM narrow mode. ••SHARP This selection is to emphasize the passband width of the filter. The filter has an almost ideal shape factor. Signals of the out of passband are extremely filtered out and it gives you better audio quality. ••SOFT 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. 4-4

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4
RECEIVING AND TRANSMITTING
4-4
Selecting the IF filter
The transceiver 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 FIL 1 (wide), FIL 2
(mid) or FIL 3 (narrow).
1.
Select the operating mode.
(Example: USB)
2. Hold down
FILTER
for 1 second.
• Opens the FILTER screen.
3.
Touch 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 or
FM-D mode.
L
When you change the passband width, the Twin PBT
setting value is reset to the center position.
6. Touch [BW].
• Cancels the passband width mode.
7.
Repeat steps 3 to 5 to set the passband width for
other modes except for the FM and FM-D modes.
8.
To close the FILTER screen, push
EXIT
.
TIP
: When you set the IF filter to FIL2 or FIL3 in the FM
mode, the transceiver will transmit in the FM narrow mode.
Mode
IF filter
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
CW
PSK
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
)
Fixed
FIL 2
(
10 kHz
)
FIL 3
(
7.0 kHz
)
Selecting the IF filter shape
You can independently set the DSP filter shape to soft
or sharp for each operating mode.
1.
Set the operating mode to SSB or CW.
(Example: USB)
2. Hold down
FILTER
for 1 second.
• Opens the FILTER screen.
3.
Select FIL1 (wide), FIL2 (mid) or FIL3 (narrow).
4. Touch [SHARP] or [SOFT].
5.
To close the FILTER screen, push
EXIT
.
•
SHARP
This selection is to emphasize the passband width of
the filter. The filter has an almost ideal shape factor.
Signals of the out of passband are extremely filtered
out and it gives you better audio quality.
•
SOFT
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.
Displayed when the selected band width is 500 Hz
or narrower, in the SSB or CW mode.
Touch for 1 second to reset to default