Icom IC-756 Instruction Manual page 30

27
4 RECEIVE AND TRANSMIT
E APF function
The APF (Audio Peak Filter) changes the receive fre-
quency response by boosting a particular frequency
for better copying of desired CW signals. The peak
frequency can be adjusted with [APF] from 300 to 900
Hz manually. The boost frequency width can be se-
lected from 80, 160 or 320 Hz.
@ Push [CW] to select CW mode.
(2) Push the [APF] switch to turn the audio peak filter
ON.
- The [APF] switch lights.
- " @PF32a ," etc. appears in the LCD.
@) Rotate the [APF] control to adjust the center fre-
quency of the peak frequency.
(4) Push [APF] for 2 sec. to select the boost frequency
width of the audio peak filter between 80, 160 and
320 Hz.
-" GFF 30," " GPF169" or " GFFI320" indicate the fre-
quency width.
© Push the [APF] switch momentarily to cancel the
audio peak filter.
ECW reverse mode
CW-R (CW Reverse) mode receives CW signals with
a reverse side CW carrier point like that of LSB and
USB modes.
Use when interfering signals are near a desired signal
and you want to change the interference tone.
e Push [CW] for 2 sec. once or twice to select CW or
CW-R mode.
- Check the interfering tone.
MRITY reverse mode
Received characters are occasionally garbled when
the receive signal is reversed between MARK and
SPACE. This reversal can be caused by incorrect
TNC connections, settings, commands, etc.
ECW pitch control
The received CW audio pitch and monitored CW
audio can be adjusted to suit your preferences (300 to
900 Hz) without changing the operating frequency.
[APF] switch
oo00000
a ace
APF indicator
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e Receive audio tone response
: ; 1/3 octave : i 1/2 octave
BFO
Push for 2 sec.
Low]
>
y
Desired signal Interference
(600 Hz) (800 Hz).
Desired signal Interference
(600 Hz) (400 Hz)
CW mode (USB side) CW-R mode (LSB side)
To receive a reversed RTTY signal correctly, select
RTTY-R (RTTY Reverse) mode.
e Push [RTTY] for 2 sec. once or twice to select RTTY
or RTTY-R mode.
- Check the receive signal.
The received CW audio pitch can be adjusted in 3 Hz
steps. l