Using The Twin Pbt - Icom IC-7300 Basic Manual

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UsingtheTwinPBT
SSB, CW, RTTY and AM modes
Ingeneral,theTwinPBT(PassbandTuning)
electronically narrows the IF passband width by
shifting the IF frequency to slightly outside of the IF
filterpassband,torejectinterference.TheIC-7300
usesDSPforthePBTfunction.
You can narrow the IF passband width by rotating
both
inner(PBT1)andouter(PBT2)to
TWIN PBT
CLR
the opposite direction from each other.
L You can see the nearby signal using the Spectrum Scope
(Section 5).
1. Rotate
inner(PBT1)andouter
TWIN PBT
CLR
(PBT2)totheoppositedirectionfromeachother.
Information
L
• Match both the
TWIN PBT
outer(PBT2)filtersbeforeoperatingtheTwinPBT.
• Rejects interference of both higher and lower
passbands.
• If you rotate the control too much, the received
audio may not be heard because the passband
width is too narrow.
• Displays the passband width and shift value.
• A dot is displayed above the passband width when
you rotate
TWIN PBT
• Hold down
TWIN PBT
PBTsetting(thedotdisappears).
•  T hePBTisadjustablein50HzstepsintheSSB,
CW, and RTTY modes, and 200 Hz in the AM
mode. In this case, the center shift value changes
in25HzstepsintheSSB,CW,andRTTYmodes,
and 100 Hz in the AM mode.
• Rotating both the inner and outer controls to the
same position shifts the IF left or right.
PBTisOFF
PBT2
PBT1
IF center frequency
(inner)(PBT1)and
CLR
.
CLR
for 1 second to clear the
CLR
Cutting
lower passband
PBT2
Interference Desired
signal
RECEIVING AND TRANSMITTING
2. Touch the Filter icon for 1 second to display the
current passband width and shift frequency.
• Opens the FILTER screen.
Passband
Shift
width
value
FILTER(SSB)screen(whileoperatingTwinPBT)
PBT1
PBT2
3. To close the FILTER screen, push
NOTE: While rotating
This comes from the DSP unit and does not indicate an
equipment malfunction.
Cutting both higher and
lower passbands
PBT1
Passband
Interference Desired
4-3
IF center frequency
Passband center frequency
SFT: Shift value
BW:
Passband width
.
EXIT
TWIN PBT
, you may hear noise.
CLR
PBT2
PBT1
Passband
Interference
signal
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