Icom IC-9100 Instruction Manual - Page 84

Twin PBT operation

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5 FUNCTIONS FOR RECEIVE ■ Twin PBT operation (Mode: SSB/CW/RTTY/AM) To reject interference, PBT (Passband Tuning) electronically 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 center frequency both above and below the received frequency. ➥ 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 frequency 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. • T he [TWIN-PBT] controls should normally be set to the center positions when there is no interference. The PBT setting should be cleared. • W hen the PBT is used, the audio tone may change. • T he controls do not function in the FM and DV modes. • W hile 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-CLR] [TWIN-PBT] M1 AGC B2.3K S + 25 DUP COMP TBW SCP Passband width and shift value are displayed while [TWIN PBT] is used. Appears when passband is shifted. • "FIL" screen (Filter) display FIL B 2.4K S BW 0 SSB-2 2.4K R:15K SHARP Shows the selected filter and passband width. • While adjusting the PBT setting FIL B 2.0K S +200 BW SSB-2 2.4K R:15K SHARP Appears when the passband is shifted. PBT OPERATION EXAMPLE Both controls in the center positions (or hold down [PBT-CLR] for 1 second.) PBT2 PBT1 Cutting the lower passband edge PBT2 PBT1 Cutting both lower and higher passband edges PBT2 PBT1 Passband Passband IF center frequency Interference Desired signal Interference Desired signal Interference 75

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75
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.
[TWIN-PBT]
[PBT-CLR]
DUP
AGC
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
• “FIL”
screen (Filter) display
• While adjusting the PBT setting
Appears when the passband is shifted.
Shows the selected filter and passband width.
PBT OPERATION EXAMPLE
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
Interference
Desired signal
Passband