ICOM 301500 Manuale Utente
46
5
FUNCTIONS FOR RECEIVE
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N Twin PBT operation
The general PBT (Passband Tuning) function elec-
tronically narrows the IF passband width by shifting
the IF frequency slightly outside of the IF filter pass-
band to reject interference. This transceiver uses the
DSP circuit for the PBT function. Moving both controls
to the same position shifts the IF.
tronically narrows the IF passband width by shifting
the IF frequency slightly outside of the IF filter pass-
band to reject interference. This transceiver uses the
DSP circuit for the PBT function. Moving both controls
to the same position shifts the IF.
The limit of the variable range depends on the pass-
band width and mode. The limit of the variable range
is half of the passband width, and PBT is adjustable
in 25 Hz steps.
band width and mode. The limit of the variable range
is half of the passband width, and PBT is adjustable
in 25 Hz steps.
MODE
TUNER
TS
FILTER
SPCH
V/M
A/B
SPLIT
M-CL
SCAN
SET
ATT
P.AMP
COMP
VOX
MNF
RIT
1
2
3
4
5
6
7
8
0
50
28
18
14
10
21
24
=
7
3.5
1.8
F-INP
M-CH/RIT
ENT
BAND
GENE
9
.
AGC
MW
ANF
METER
NR
NB
[TWIN PBT]
• The [TWIN PBT] controls should normally be set
to the center positions (PBT setting is cleared)
when there is no interference.
when there is no interference.
•
When PBT is used, the audio tone may be
changed.
changed.
•
While rotating the [TWIN PBT] control, noise may
occur. This comes from the DSP unit and does
not indicate an equipment malfunction.
occur. This comes from the DSP unit and does
not indicate an equipment malfunction.
PBT OPERATION EXAMPLE
IF center frequency
Interference
Desired signal
Passband
Both controls at
center position
center position
Cutting the lower
passband
passband
Cutting both higher and
lower passbands
lower passbands
Interference
Interference
Desired signal
Passband
TWIN PBT
TWIN PBT
TWIN PBT