![background image](http://html2.mh-extra.com/html/icom/ic-7300/ic-7300_basic-manual_4107742033.webp)
4
RECEIVING AND TRANSMITTING
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
4-3
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
TWIN PBT
CLR
inner(PBT1)andouter(PBT2)to
the opposite direction from each other.
L
You can see the nearby signal using the Spectrum Scope
(Section 5).
1. Rotate
TWIN PBT
CLR
inner(PBT1)andouter
(PBT2)totheoppositedirectionfromeachother.
2. Touch the Filter icon for 1 second to display the
current passband width and shift frequency.
•Opens the FILTER screen.
Passband
width
Shift
value
FILTER(SSB)screen(whileoperatingTwinPBT)
3. To close the FILTER screen, push
EXIT
.
NOTE
: While rotating
TWIN PBT
CLR
, you may hear noise.
This comes from the DSP unit and does not indicate an
equipment malfunction.
PBT2
PBT1
PBT2
PBT1
PBT2
PBT1
PBTisOFF
Cutting
lower passband
Cutting both higher and
lower passbands
IF center frequency Interference Desired
signal
Passband
Passband
Interference Desired
signal
Interference
IF center frequency
Passband center frequency
SFT: Shift value
BW:
Passband width
PBT1
PBT2
Information
L
• Match both the
TWIN PBT
CLR
(inner)(PBT1)and
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
CLR
.
• Hold down
TWIN PBT
CLR
for 1 second to clear the
PBTsetting(thedotdisappears).
•ThePBTisadjustablein50HzstepsintheSSB,
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.