D What Are You Hearing; Verify Mode; Reducing Interference - Icom IC-703 Instruction Manual

D 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?

1. Verify mode

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.
2. Reducing interference (some functions may require an optional unit depending on version)
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.
q Select
(DSP menu).
• Push [DISPLAY] once or twice to select .
• Push [MENU] one or more times to select
w Push [
] to activate the noise reduction func-
(F-2)
tion.
• "DSP" and "NR" appear when the function is ON.
[MENU] [(F-2)]
USB
DSP
Appear
NR NR
S1 3 5 7 9 20
P 5
O
Noise reduction ON
Noise reduction OFF
.
[DISPLAY]
BLANK
VFO A
40 60dB
CH
10
QUICK REFERENCE GUIDE
MODE
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.
b. Adjusting the Noise Reduction: The noise re-
duction is completely variable on how much of the
DSP Noise Reduction is used.
q Push [
] to indicate the noise reduction
(F-3)
level.
w Rotate the [M-CH] control to set the noise reduc-
tion level.
e Push [
] to exit the noise reduction level
(F-3)
set mode.
[M-CH] [(F-3)]
USB
DSP
NR NR
S1 3 5 7 9 20 40
P 5
O
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.
BLANK
VFO A
60dB
CH
10
VI