ICOM IC-703 ユーザーズマニュアル

VI

QUICK REFERENCE GUIDE

D What are you hearing? 

Stop and focus on what you are hearing. Do you hear
a lot of noise? Is the signal intelligible? Are you set up
for the right mode? How about the filters?

Your IC-703 has many features to reduce QRM and
QRN from the desired signal. 

a. Noise Reduction: The noise reduction system on

your IC-703 is part of the DSP. This is used to re-
duce the hiss and QRM levels.

qSelect S4 (DSP menu).

• Push [DISPLAY] once or twice to select 

S.

• Push [MENU] one or more times to select 

S4.

wPush [

(F-2)

NR] to activate the noise reduction func-

tion.

• “DSP” and “NR” appear when the function is ON.

b. Adjusting the Noise Reduction: The noise re-

duction is completely variable on how much of the
DSP Noise Reduction is used.

qPush [

(F-3)

NRL] to indicate the noise reduction

level.

wRotate the [M-CH] control to set the noise reduc-

tion level.

ePush [

(F-3)

NRL] to exit the noise reduction level

set mode.

Hint!
How far you advance the NR control will determine
how much the noise can be effectively reduced. Ad-
justing the noise reduction level too high may cause
some distortion to occur on the received signal. The
noise reduction level should only be set as high as
is necessary. Use this setting, along with RF gain,
NB (noise blanker, if needed), and IF filters as well,
to minimize the effects of noise on the target signal.

S4 LEVEL 4 NRL

NR

[(F-3)]

[M-CH]

Noise reduction ON

Noise reduction OFF

S4 ANF NR  NRL

NR

[(F-2)]

[MENU]

[DISPLAY]

Appear

Although your IC-703 will automatically select USB or
LSB in the HF bands, it will not select any of the other
modes. You will need to select the proper mode
whether CW, RTTY, AM or FM.

Hint!
The Band Stacking Register will memorize the last
frequency used in the band, as well as the Mode,
Filter, Tuner and AGC settings. This makes band
hoping much easier.

2. Reducing interference (some functions may require an optional unit depending on version)