Using The Digital Twin Pbt; D Using The Filter Effect Screen - Icom IC-7760 Basic Manual

4
RECEIVING AND TRANSMITTING

Using the Digital Twin PBT

SSB, CW, RTTY, PSK, and AM modes
To reject interference, the Digital Twin Passband
Tuning (PBT) narrows the IF passband width by
electronically shifting the IF frequency to slightly
above or below the IF center frequency. The IC-7760
uses the digital function using the FPGA (Field
Programmable Gate Array) filtering method.
L Each band memorizes the PBT setting.
z Rotate inner (PBT1) and outer (PBT2)
TWIN PBT
CLR
to adjust the shift value.
• The passband width and shift value
are displayed.
• The indicator to the left of
lights white when you use the Digital
TWIN PBT
CLR
Twin PBT to change the IF passband width.
L Hold down
TWIN PBT
CLR
setting.
L Information
• To narrow the IF passband width, shift "PBT1" and "PBT2"
in the opposite direction from each other, to narrow the
overlapped area.
• To use as the IF Shift function, set "PBT1" and "PBT2" to
the same value.
• The PBT is adjustable in 50 Hz steps in the SSB, CW,
RTTY, and PSK modes, and 200 Hz in the AM mode. The
center shift value changes in 25 Hz steps in the SSB,
CW, RTTY, and PSK modes, and 100 Hz in the AM mode.
NOTE: While rotating
TWIN PBT
some noise. This comes from the FPGA and does
not indicate an equipment malfunction.

D Using the Filter Effect screen

Displayed when you change
the IF passband width.
To display the keys,
touch the screen.
for 1 second to clear the PBT
Lights white when you change
the IF passband width
TWIN PBT
CLR
, you may hear
CLR
Default value
PBT2
PBT1
Interference Interference
IF center frequency
TIP:
• A dot "·" is displayed on the IF Filter indicator when you
change the IF passband width, using the Digital Twin
PBT.
Passband width
Shift value
• Touch the IF Filter indicator for 1 second to display the
current passband width and shift value.
Opens the FILTER screen.
Main/Sub Passband width
band icon
Shift value
PBT1
PBT2
Cutting
lower passband
PBT1
Passband Interference
IF center frequency
4-4
IF center frequency
Passband center
frequency
SFT: Shift value
BW: Passband
width
Cutting both higher and
lower passbands
PBT2
Desired signal
IF center frequency