Selecting The If Filter; Selecting The If Filter Shape - Icom IC-7610 Basic Manual

4
RECEIVING AND TRANSMITTING

Selecting the IF filter

Thetransceiverhas3IFfilterpassbandwidthsfor
each mode, and you can select them on the FILTER
screen.YoucansettheIFfiltertoFIL1(wide),FIL2
(mid) or FIL 3 (narrow).
1. Select the operating mode.
(Example: USB)
2. Hold down
FILTER
• 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 to select the passband width.
MAIN DIAL
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.
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
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
TIP:WhenyousettheIFfiltertoFIL2orFIL3intheFM
mode, the transceiver will transmit in the FM narrow mode.
for 1 second.
.
EXIT
Mode IF filter
FIL 1 (3.0 kHz)
FIL 2 (2.4 kHz)
SSB
FIL 3 (1.8 kHz)
FIL 1 (1.2 kHz)
SSB-D
FIL 2 (500 Hz)
CW
PSK
FIL 3 (250 Hz)
FIL 1 (2.4 kHz)
FIL 2 (500 Hz)
RTTY
FIL 3 (250 Hz)
FIL 1 (9.0 kHz)
AM
FIL 2 (6.0 kHz)
AM-D
FIL 3 (3.0 kHz)
FIL 1 (15 kHz)
FM
FIL 2 (10 kHz)
FM-D
FIL 3 (7.0 kHz)

Selecting the IF filter shape

YoucanindependentlysettheDSPfiltershapetosoft
or sharp for each operating mode.
1. Set the operating mode to SSB or CW.
(Example: USB)
2. Hold down
FILTER
• 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
• SHARP
This selection is to emphasize the passband width of
thefilter.Thefilterhasanalmostidealshapefactor.
Signalsoftheoutofpassbandareextremelyfiltered
out and it gives you better audio quality.
• SOFT
  T hefiltershouldersareroundlyformedasinanalog
filters.Thisdecreasesnoisecomponentsinthe
highandlowfrequenciesofthefilterpassband
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
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
for 1 second.
.
EXIT