Icom IC-7600 Instruction Manual - Page 82

■ Twin PBT operation, <MODE> SSB/CW/RTTY/PSK/AM, TWIN-PBT], DEF] F-4

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4 RECEIVE AND TRANSMIT ■ Twin PBT operation SSB/CW/RTTY/PSK/AM PBT (Passband Tuning) electronically narrows the IF passband width by shifting the IF frequency slightly outside of the IF filter passband to reject interference. The IC-7600 uses DSP for the PBT function. Moving both [TWIN-PBT] controls to the same position shifts the IF both above and below the received frequency. ➥ The LCD shows the passband width and shift frequency graphically. • The indicator on the [PBT-CLR] switch lights when PBT is in use. ➥ Push and hold [FILTER] for 1 sec. to enter the filter set screen. Current passband width and shift frequency is displayed in the filter set screen. ➥ To set the [TWIN-PBT] controls to the center positions, push and hold [PBT-CLR] for 1 sec. The variable range depends on the passband width and mode. The edge of the variable range is half of the passband width, and PBT is adjustable in 25 (SSB/CW/RTTY/PSK modes) or 100 Hz (AM mode) steps. • The [TWIN-PBT] controls should normally be set to the center positions (PBT setting is cleared) when there is no interference. • When PBT is used, the audio tone may be changed. • Not available for FM mode. • While rotating the [TWIN-PBT] controls, noise may occur. This comes from the DSP unit and does not indicate an equipment malfunction. • Push and hold [DEF] (F-4) for 1 sec. to select a default value. PBT-CLR [TWIN-PBT] F-4 DEF FILTER Shows filter width, shifting value and condition • Filter set screen "SHARP" is selected. • PBT operation example Both controls at center position 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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■
Twin PBT operation
<MODE> SSB/CW/RTTY/PSK/AM
PBT (Passband Tun±ng) electron±cally narrows the IF
passband w±dth by sh±ft±ng the IF frequency sl±ghtly
outs±de of the IF f±lter passband to reject ±nterference.
The IC-7600 uses DSP for the PBT funct±on. Mov±ng
both
[TWIN-PBT]
controls to the same pos±t±on sh±fts
the IF both above and below the rece±ved frequency.
➥
The LCD shows the passband w±dth and sh±ft fre-
quency graph±cally.
•
The ±nd±cator on the
[PBT-CLR]
sw±tch l±ghts when
PBT ±s ±n use.
➥
Push and hold
[FILTER]
for 1 sec. to enter the f±lter
set screen. Current passband w±dth and sh±ft fre-
quency ±s d±splayed ±n the f±lter set screen.
➥
To set the
[TWIN-PBT]
controls to the center pos±-
t±ons, push and hold
[PBT-CLR]
for 1 sec.
The var±able range depends on the passband w±dth
and mode. The edge of the var±able range ±s half
of the passband w±dth, and PBT ±s adjustable ±n 25
(SSB/CW/RTTY/PSK modes) or 100 Hz (AM mode)
steps.
•
The
[TWIN-PBT]
controls should normally be set to
the center pos±t±ons (PBT sett±ng ±s cleared) when
there ±s no ±nterference.
•
When PBT ±s used, the aud±o tone may be changed.
• Not ava±lable for FM mode.
•
Wh±le rotat±ng the
[TWIN-PBT]
controls, no±se may
occur. Th±s comes from the DSP un±t and does not
±nd±cate an equ±pment malfunct±on.
•
Push and hold
[DEF] (F-4)
for 1 sec. to select a
default value.
• PBT operation example
PBT2
PBT1
PBT2
PBT1
PBT2
PBT1
IF center frequency
Interference
Desired signal
Passband
Both controls at
center position
Cutting the lower
passband edge
Cutting both lower and
higher passband edges
Interference
Interference
Desired signal
Passband
[TWIN-PBT]
PBT-CLR
FILTER
F-4
DEF
Shows filter width, shifting value and condition
• Filter set screen
“SHARP” is selected.
75
4
RECEIVE AND TRANSMIT