ICOM IC-7000 说明手册

77

5

FUNCTIONS FOR RECEIVE

The general PBT (Passband Tuning) function elec-
tronically narrows the IF passband width by shifting the
IF frequency slightly outside of the IF filter passband
to reject interference. This transceiver uses the DSP
circuit for the PBT function. Moving both 

/M-ch/RIT

controls to the same position shifts the IF.

➥ Push 

momentarily to select the

twin PBT function, if the M-ch-RIT is selected.

•

indicator (Green) lights.

• The passband settings window shows the passband

width and shift frequency graphically. (The passband
settings window can be turned OFF in the display set
mode. p. 125)

➥ When M

M--1

1 is selected, push and hold 

F

FI

IL

L

for

1 sec. to enter the filter set mode. Current passband
width and shift frequency is displayed in the filter set
mode.

➥ To set the 

/M-ch/RIT

controls to the center posi-

tions, push and hold 

/M-ch/RIT

for 1 sec.

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
100 (AM) or 25 Hz steps (other modes).

•

controls should normally be set to the center posi-

tions (PBT setting is cleared) when there is no interfer-
ence.

• When PBT is used, the audio tone may be changed.
• Not available for FM or WFM modes.
• While rotating 

, noise may occur. This comes from

the DSP unit and does not indicate an equipment mal-
function.

Passband

width

Selected IF filter

Shift 

frequency

Popup indicator appears

Dot indicator appears 
when PBT is activate

[MENU/GRP]

[F-3]

[PBT/M-ch/RIT] indicator

[PBT

/M-ch/RIT

(CLR)] switch/[PBT] (inner) control

[PBT] (outer) control

IF center frequency

Interference

Desired signal

Passband

Both controls at 
center position

Cutting the lower 
passband

Cutting both higher and 
lower passbands

Interference

Interference

Desired signal

Passband

■