Icom Ic-703 Hf/50mhz All Mode Tranciever Instruction Manual

5
46
FUNCTION FOR RECEIVE
Simple band scope
This function allows you to visually “sweep” an area
surrounding the set frequency for other signals. De-
tected signals are indicated graphically in the dot ma-
trix section of the display.
NOTE: Use the attenuator or turn OFF the preamp
when using the band scope on a band containing a lot
of noise.
qSet a mode and frequency.
wSelect G1.
• Push [DISPLAY] once or twice to select G.
• Push [MENU] one or more times to select G1.
ePush [F-1] one or more times to...

The IF shift function electronically changes the pass-
band frequency of the IF (intermediate frequency)
and cuts out higher or lower frequency components
of the IF to reject interference. The function shifts the
IF frequency up to ±1.2 kHz in 15 Hz steps in
SSB/CW/RTTY modes and up to ±250 Hz in 3 Hz
steps in CW-ã/RTTY-ãmodes. The IF shift is not
available in FM and AM modes.
(ã: Narrow)
qAdjust the [SHIFT] control for a minimum interfer-
ence signal level.
• The audio tone may be changed while the IF...

48
5FUNCTION FOR RECEIVE
Noise blanker
AGC time constant
The noise blankerreduces pulse-type noise such as
that generated by automobile ignition systems. This
function is not effective for FM mode or for non pulse-
type noise. If you don’t want to use the noise blanker
for AM communications, the “30 AM NB” item in initial
set mode must be turned OFF (ON is the default set-
ting—p. 80).
qSelect M3.
• Push [DISPLAY] once or twice to select M.
• Push [MENU] one or more times to select M3.
wPush [(F-2)NB]...

49
5FUNCTION FOR RECEIVE
Optional filter selection
• Filter variations
*Optional filter.
**Although the FL-96 is not listed on the option list, IC-703 would
take FL-96 as well as other optional filter.
One optional filter can be installed in the IC-703.
Narrow filters help reject interference from adjacent
signals and obtain good selectivity.
Wide filters provide improved audio for SSB operation
when no interfering signals are present.
Consult the table below to select a filter most suitable
for your...

50
5FUNCTION FOR RECEIVE
This function automatically attenuates beat tones,
tuning signals, etc., even if they are moving. The au-
tomatic notch filter functions in SSB, FM and AM
modes.
qSelect S4(DSP menu).
• Push [DISPLAY] once or twice to select S.
• Push [MENU] one or more times to select S4.
wPush [(F-1)ANF] to toggle the automatic notch fil-
ter ON and OFF.
• “DSP” and “ANF” appear when the function is ON.
CH VFO APO
S1
5 5 379
20 40
10 60dB
USB
ANF ANF
BLANK
DSP
S4  ANF  NR    NRL
[DISPLAY]...

6
51
FUNCTION FOR TRANSMIT
Split frequency operation allows you to transmit and
receive on two different frequencies. Split frequency
operation uses 2 frequencies, one in VFO A and the
other in VFO B.
Following is an example of setting 7.057 MHz, CW
mode in VFO A (for receiving) and 7.025 MHz, CW
mode in VFO B (for transmitting).
qSelect VFO A and set the frequency to 7.057
MHz/CW.
•[(F-2)A/B] is available when M1appears.
•[
(F-3)V/M] is available when M2appears.
wPush or push and hold [(F-1)SPL] in the...

52
6FUNCTION FOR TRANSMIT
DQuick split function
In M1, when you push [(F-1)SPL] for 1 sec., split fre-
quency operation is turned ON and VFO B is auto-
matically changed according to the plus/minus
pre-programmed shift frequency set in initial set mode
(or equalized when 0 kHz is programmed as the split
shift frequency). This shortens the time needed to
start split frequency operation—great for DX’ing.
The quick split function is ON by default. If desired, it
can be turned OFF in initial set mode (p....

53
6FUNCTION FOR TRANSMIT
The VOX (Voice-operated Transmission) function tog-
gles between transmit and receive with your voice.
This function provides an opportunity to input log en-
tries into your computer, etc., while operating.
qSelect M4.
• Push [DISPLAY] once or twice to select M.
• Push [MENU] one or more times to select M4.
wPush [(F-1)VOX] to toggle the VOX function ON
and OFF.
• “VOX” appears when the function is ON.
ePush [(F-1)VOX] for 1 sec. to enter the VOX set
mode (below), then set the...

54
6FUNCTION FOR TRANSMIT
The IC-703 has a built-in, low distortion speech com-
pressor circuit. This circuit increases your average
talk power in SSB mode and is especially useful for
DX’ing when the receiving station is having difficulty
copying your signal.
qSelect USB or LSB mode.
wSelect the mic gain display in quick set mode.
• Push [DISPLAY] for 1 sec.
• Push [MENU] one or more times to select “Q2  MIC
GAIN.”
• The ALC meter is selected automatically when operat-
ing in SSB mode.
eAdjust the mic...

55
6FUNCTION FOR TRANSMIT
The IC-703 has a built-in circuit for measuring an-
tenna SWR—no external equipment or special ad-
justments are necessary.
The IC-703 can measure SWR in 2 ways:
(A) Spot measurement; or (B) Plot measurement.
(A) Spot measurement
qConfirm that the output power is over 5 W.
wPush [MENU] one or more times to select M3.
ePush [
(F-3)MET] to select the SWR meter.
rPush [MODE] one or more times to select CW or
RTTY operation.
• Key down or push [PTT] to transmit; then read the ac-...