Справочник Пользователя для ICOM ic-756pro3

6

1

PANEL DESCRIPTION

@9 ∂

∂

∂

∂

(p. 69)

➥Turns the ∂TX function ON and OFF when

pushed.

• Use the 

∂

∂

control to vary the ∂TX frequency.

➥Adds the ∂TX shift frequency to the operating

frequency when pushed for 1 sec.

✔

∂

∂

The ∂TX shifts the transmit frequency without shifting the re-
ceive frequency. This is useful for simple split frequency op-
eration in CW, etc.

#0

(pgs. 58, 69)

Clears the RIT/∂TX shift frequency when pushed
for 1 sec. (default).

• The response time (for 1 sec. or momentarily) can be

selected on the quick RIT/∂TX clear setting (p. 103).

#1

(p. 58)

➥Turns the RIT function ON and OFF when

pushed.

• Use the 

∂

∂

control to vary the RIT frequency.

➥Adds the RIT shift frequency to the operating fre-

quency when pushed for 1 sec.

✔

The RIT (Receiver Incremental Tuning) shifts the receive fre-
quency without shifting the transmit frequency.

This is useful for fine tuning stations calling you on an off-fre-
quency or when you prefer to listen to slightly different-
sounding voice characteristics, etc.

#2

(inner control; p. 64)
Varies the peak frequency of the manual notch fil-
ter to pick out a receive signal from interference
while the manual notch function is ON.

• Notch filter center frequency:

SSB : 0 Hz to 5100 Hz
CW

: CW pitch freq.–900 Hz to CW pitch freq.

+4200 Hz

AM

: –5100 Hz to 5100 Hz

#3

(outer control; p. 37)
Shifts the received CW audio pitch and monitored
CW audio pitch without changing the operating fre-
quency.

#4

(p. 64)

➥Switches the notch function between auto, man-

ual and OFF in SSB and AM modes.

➥Turns the manual notch function ON and OFF

when pushed in CW mode.

➥Turns the auto notch function ON and OFF when

pushed in FM mode.

• “AN” appears on the display when auto notch is in

use.

• “MN” appears on the display when manual notch is in

use.

• The 

indicator in this switch lights green

when the function is activated.

✔

The notch function eliminates unwanted CW or AM carrier
tones while preserving the desired signal’s audio response.
The filtering frequency is adjusted to effectively eliminate un-
wanted tones via the DSP circuit.

#5

(p. 60)

Clears the PBT settings when pushed for 1 sec.

• The 

indicator in this switch lights green when

PBT is in use.

#6

Adjust the receiver’s “passband width” of the DSP
filter. (p. 60)

• Passband width and shift frequency are displayed in the

LCD.

• Push 

for 1 sec. to clear the settings when

not in use.

• Variable range is set to half of the IF filter passband

width. 25 Hz steps and 50 Hz steps are available.

• These controls function as an IF shift control while in AM

mode and when the RTTY filter is turned ON. Only the
inner control may function in this case.

✔

General PBT function electronically narrows the IF passband
width to reject interference. This transceiver uses the DSP
circuit for the PBT function.

Low cut

High cut

Center

–

+

PBT1

PBT2

Notch OFF

Notch ON

Approx. 300 Hz

Approx. 900 Hz

Lower frequency

Higher frequency

Lower frequency

Higher frequency