4
RECEIVING AND TRANSMITTING
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4-3
Using the Digital Twin PBT
SSB, CW, RTTY and AM modes
To reject interference, the Digital Twin PBT
(Passband Tuning) narrows the IF passband width
by electronically shifting the IF frequency to slightly
above or below the IF center frequency. The IC-
9700 uses the digital function using the FPGA (Field
Programmable Gate Array) filtering method.
L
Each band memorizes the PBT setting.
1.
Push [PBT] to select “PB1.”
L
Each push selects “PBT1” or “PBT2.”
Passband
width
Shift
value
NOTE
: While rotating
MULTI
, you may hear some
noise. This comes from the FPGA and does not indicate an
equipment malfunction.
IF center frequency
Passband center frequency
SFT: Shift value
BW:
Passband width
PBT1
PBT2
L
Hold down
MULTI
for 1 second to clear the PBT
setting.
3.
Repeat steps 1 and 2 to adjust the shift value for
“PBT2.”
Information
L
•
To narrow the IF passband width, shift “PBT1” and
“PBT2” to the opposite direction from each other, to
narrow the overwrapped area.
•
To shift the IF left or right, set “PBT1” and “PBT2” to the
same value.
• The PBT is adjustable in 50 Hz steps in the SSB, CW,
and RTTY modes, and 200 Hz in the AM mode. In this
case, the center shift value changes in 25 Hz steps in
the SSB, CW, and RTTY modes, and 100 Hz in the AM
mode.
Information
L
•
Touch the filter icon for 1 second to display the current
passband width and shift value.
•Opens the FILTER screen.
PBT is OFF
Cutting
lower passband
Cutting both higher and
lower passbands
IF center frequency
Interference
Desired
signal
Passband
Passband
Interference
Desired
signal
Interference
PBT1
PBT2
PBT1
PBT2
PBT1
PBT2
2. Rotate
MULTI
to adjust the shift value.
L
The passband width and shift value are displayed.
“PBT1” or
“PBT2”
