4
RECEIVING AND TRANSMITTING
4-4
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
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
:WhenyousettheIFfiltertoFIL2orFIL3intheFM
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
YoucanindependentlysettheDSPfiltershapetosoft
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
thefilter.Thefilterhasanalmostidealshapefactor.
Signalsoftheoutofpassbandareextremelyfiltered
out and it gives you better audio quality.
•
SOFT
Thefiltershouldersareroundlyformedasinanalog
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.
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
Содержание IC-7610
Страница 1: ...BASIC MANUAL i7610 HF 50 MHz TRANSCEIVER...