Twin Pbt Operation - Icom IC-R9500 Instruction Manual

■ Twin PBT operation

[TWIN PBT] for lower [TWIN PBT] for higher
[PBT CLEAR]
Shows filter width, shifting value and condition
• PBT operation example
Both controls at
center position
(PBT1)
IF center frequency
(PBT2) (PBT1)
Interference
PBT (Passband Tuning) electronically narrows the IF
passband width by shifting the IF frequency slightly
outside of the IF filter passband, rejecting interference.
The IC-R9500 uses DSP for the PBT function. Moving
both [TWIN PBT] controls to the same position shifts
the IF.
➥ The LCD shows the passband width and shift fre-
quency graphically.
➥ Push and hold [FILTER] for 1 sec. to enter the filter
set screen. Current passband width and shift fre-
quency is displayed in the filter set screen.
➥ To set the [TWIN PBT] controls to the center posi-
tions, push and hold [PBT CLR] for 1 sec.
The variable range depends on the passband width
and mode. The edge of the variable range is half of the
passband width, and PBT is adjustable in 25 or 50 Hz
steps.
• [TWIN PBT] should normally be set to the center posi-
tions (PBT setting is cleared) when there is no interfer-
ence.
• When PBT is used, the audio tone may be changed.
• Not available for FM/WFM or P25 mode.
• While rotating [TWIN PBT], noise may occur. This comes
from the DSP unit and does not indicate an equipment
malfunction.
Reducing a lower
passband
(PBT2)
or
Passband
Desired signal
5-11
RECEIVE FUNCTIONS
Reducing both higher and
lower passbands
(PBT1)
Passband
Interference Interference
Desired signal
5
(PBT2)