Twin Pbt Operation - Icom i9100 Instruction Manual

5
FUNCTIONS FOR RECEIVE

■ Twin PBT operation

(Mode: SSB/CW/RTTY/AM)
To reject interference, PBT (Passband Tuning) elec-
tronically narrows the IF passband width by shifting the
IF frequency slightly outside of the IF filter passband.
The IC-9100 uses DSP for the PBT function. Moving
both [TWIN-PBT] controls shift the IF passband cen-
ter frequency both above and below the received fre-
quency.
➥ The LCD graphically shows the passband width and
frequency shift.
➥ Hold down [FILTER] for 1 second to display the "FIL"
screen (Filter). Current passband width and fre-
quency shift are displayed in the "FIL" screen.
➥ Hold down [PBT-CLR] for 1 second to set the IF
frequency to the center position.
• The "dot" disappears.
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 interfer-
ence. The PBT setting should be cleared.
• When the PBT is used, the audio tone may
change.
• The controls do not function in the FM and DV
modes.
• While rotating the [TWIN-PBT] controls, noise may
occur. This comes from the DSP unit and does not
indicate an equipment malfunction.
• Pushing [PBT-CLR] displays the filter passband
width and shift value for 1 seconds on the function
display.
PBT OPERATION EXAMPLE
Both controls in the center
positions (or hold down
[PBT-CLR] for 1 second.)
IF center frequency
75
PBT2
PBT1
Interference
M1
A G C
Passband width and shift
value are displayed while
[TWIN PBT] is used.
• "FIL" screen (Filter) display
FIL
B W
Shows the selected filter and passband width.
• While adjusting the PBT setting
FIL
B W
Cutting the lower
passband edge
PBT2
PBT1
Passband
Desired signal Interference
[PBT-CLR]
B 2 . 3 K S + 2 5
D U P C O M P T B W
Appears when pass-
band is shifted.
S S B - 2
B 2 . 4 K S 0
S H A R P
S S B - 2
2 . 0 K + 2 0 0
B S
S H A R P
Appears when the passband is shifted.
Cutting both lower and
higher passband edges
PBT2
Passband
Desired signal Interference
[TWIN-PBT]
S C P
2 . 4 K
R : 1 5 K
2 . 4 K
R : 1 5 K
PBT1