5
FUNCTIONS FOR RECEIVE
5-5
(Mode: SSB/CW/RTTY/AM)
To reject interference, PBT (Passband Tuning) electron
-
ically narrows the IF passband width by shifting the IF
frequency slightly outside of the IF filter passband. The
IC-7100 uses DSP for the PBT function. Moving both
TWIN-PBT ([M-CH/BANK] (
L
)) controls shift the IF
passband center frequency both above and below the
received frequency.
The LCD graphically shows the passband width and
➥
frequency shift.
Touch the Filter icon for 1 second to display the “FIL-
➥
TER” screen. Current passband width and frequency
shift are displayed in the “FILTER” screen.
Hold down [CLR]
➥
(
L
) for 1 second to set the IF
frequency to the center position.
• The “dots” disappear.
The PBT is adjustable in 50 Hz steps in the SSB/CW/
RTTY modes, and 200 Hz in the AM mode.
In this time, the shift value changes in 25 Hz steps in the
SSB/CW/RTTY modes, and 100 Hz in the AM mode.
• The TWIN-PBT controls should normally be set to
the center positions when there is no interference.
The PBT setting should be cleared.
• When the PBT is used, the audio tone may
change.
• The controls do not function in the FM, WFM and
DV modes.
• While rotating the TWIN-PBT ([M-CH/BANK]
(
L
))
controls, noise may occur. This comes from the
DSP unit and does not indicate an equipment mal-
function.
• Pushing [M-CH]]
(
L
) displays the filter passband
width and shift value for 1 second.
Twin PBT operation
PBT2
PBT1
PBT2
PBT1
PBT2
PBT1
Both controls in the
center positions
Cutting the lower
passband edge
Cutting both lower and
higher passband edges
PBT OPERATION EXAMPLE
IF center frequency
Interference
Interference
Interference
Desired signal
Passband
Passband
Desired signal
Passband width and shift value are dis-
played while the TWIN PBT is used.
Appear when pass-
band is shifted.
• “FILTER”
screen display
• While adjusting the PBT setting
A dot appears when the passband is shifted.
Shows the selected filter and passband width.
•
About Passband width and Shift value
on the screen
SFT
BW
: Shift value
IF center
frequency
Passband’s
center frequency
: Passband width
( Width of (
) with which
two PBTs overlap)
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