User's Manual

75
5
FUNCTIONS FOR RECEIVE
N4WIN0"4OPERATION
-ODE33"#72449!- 
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.
 s4HEhDOTvDISAPPEARS
The variable range depends on the passband width
and mode. The edge of the variable range is half of the
passband width. The PBT is adjustable in 25 Hz steps
INTHE33"#72449MODESAND(ZINTHE!-
mode.
s The [TWIN-PBT] controls should normally be set
to the center positions when there is no interfer-
ence. The PBT setting should be cleared.
s7HEN THE 0"4 IS USED THE AUDIO TONE MAY
change.
s4HECONTROLSDONOTFUNCTIONINTHE&-AND$6
modes.
s7HILEROTATING THE;47).0"4= CONTROLS NOISE
may occur. This comes from the DSP unit and
does not indicate an equipment malfunction.
s
Pushing [PBT-CLR] displays the filter passband
width and shift value for 1 seconds on the function
display.
0"4/0%2!4)/.%8!-0,%
[TWIN-PBT][PBT-CLR]
DUPAGC COMP TBW SCP
M1
S
+ 25
B
2.3K
Passband width and shift
value are displayed while
[TWIN PBT] is used.
Appears when pass-
band is shifted.
BW
SSB-2 2.4K
R:15K
SHARP
FIL
S
0
B
2.4K
BW
SSB-2 2.4K
R:15K
SHARP
FIL
S
+200
B
2.0K
sh&),v SCREEN&ILTERDISPLAY
s7HILEADJUSTIONGTHE0"4SETTING
Appears when the passband is shifted.
Shows the selected filter and passband width.
Both controls in the center
positions (or hold down
[PBT-CLR] for 1 second.)
Cutting the lower
passband edge
Cutting both lower and
higher passband edges
PBT2
PBT1
PBT2
PBT1
PBT2
PBT1
IF center frequency Interference Desired signal
Passband
Interference InterferenceDesired signal
Passband