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 select the desired
steps.
• Each dot corresponds to a step for the indicated fre-
quency.
• 0.5k, 1k, 2k, 5k, 10k, 20k and 0.1M (100 kHz) can be
set for the scope step.
rPush [F-3] to start the sweep.
•“___” (below SWP) flashes while sweeping.
• The receive audio is muted while sweeping.
tRotate the main dial if you want to monitor the dis-
played signals.
• The sweep marker indicates the location of the dis-
played frequency in the sweep readout.
• If the displayed frequency is outside of the sweep read-
out (determined by the sweep width), the sweep marker
flashes.
yPush [F-2] to return the frequency to the start of a
sweep.
• The sweep marker moves back to the center position.
1kSWP
2kSWP
2kSWP
2kSWP ___
2kSWP
Select sweep width
([F-1])
Start sweep
([F-3])
Sweep is finished
([F-3] again)
Move sweep marker
(main dial)
2kSWP
Returns to previous
frequency ([F-2]) sweep marker
Main dial
[DISPLAY] [MENU]
[F-2]
[F-3][F-1]
Preamp and attenuator
The preampamplifies received signals in the front
end circuit to improve the S/N ratio and sensitivity.
Turn this function ON when receiving weak signals.
The attenuatorprevents desired signals from distort-
ing when very strong signals are near the desired fre-
quency or when very strong electric fields, such as
from broadcasting stations, are near your location.
Push [P.AMP/ATT] momentarily to turn the preamp ON
and OFF; push for 1 sec. to turn the attenuator ON.
• Lights green when the preamp is ON; lights red when
the 20 dB attenuator is ON.
• Only one of these functions can be activated at a time.
momentarily
momentarily 1 sec.
P.AMP/ATT
P.AMP/ATT
[P.AMP/ATT]
P.AMP/ATT
Lights green while the preamp is activated;
lights red while the attenuator is activated.
4
5 
						

							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 shift is in
use.
wSet the shift control to its center position when
there is no interference.
•Graphic display
The IF shift is displayed graphically (for about 1 sec.)
each time the shift control is rotated.
M-CH M-CH M-CHSHIFT
M-CHSHIFT
SHIFTSHIFT
Shifts lowCenterShifts high
SHIFT
[SHIFT]
CH
VFO AS1
5 379204060dB
USB
RIT function
The RIT (Receive Incremental Tuning) function com-
pensates for off-frequencies of communicating sta-
tions. The function shifts the receive frequency up to
±9.99 kHz in 10 Hz steps without moving the transmit
frequency. “21 SUB DIAL” item in initial set mode
must be set to RIT mode in advance. (p. 79)
qPush [RIT].
• The [RIT] indicator lights red.
wRotate the [M-CH] control to cancel the off-fre-
quencies.
• The transmit frequency is not shifted.
eTo cancel the RIT function, push [RIT] again.
• The [RIT] switch indicator goes out.
•Calculate function
The shift frequency of the RIT function can be
added/subtracted to the displayed frequency.
While the RIT indicator is lit, push and hold [RIT] for
1 sec.
NOTE: The RIT function is not available in FM or
AM modes regardless of the Initial Set mode set-
ting. (p. 79)
Push for
1 sec.
USB
USB
RIT
SUB
RIT
SUB
Indicator lights red while
RIT function is activated.
[M-CH][RIT]
IF shift function
47
5FUNCTION FOR RECEIVE 
						

							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] to toggle the noise blanker ON and
OFF.
• “NB” appears when the noise blanker is turned ON.
ePush [(F-2)NB] for 1 sec. to enter the noise blanker
level set mode (below).
rRotate the main dial to set the noise blanker level.
tPush [DISPLAY] to exit the noise blanker level set
mode.
NB
CH
VFO AS1
5 379204060dB
USB
M3FIL
NBMET
PO5
10
Appears when 
the noise blanker 
is turned ON.
Main dial [DISPLAY] [MENU] [F-2]
The AGC(Automatic Gain Control) controls receiver
gain to produce a constant audio output level even
when the received signal strength is varied by fading,
etc. Use AGC slow for normal phone operation; AGC
fast for receiving data and searching for signals. AGC
time constant cannot be changed in FM mode.
qSelect M4.
• Push [DISPLAY] once or twice to select M.
• Push [MENU] one or more times to select M4.
wPush [(F-3)AGC] to toggle the AGC time constant
between fast and slow.
•“FAGC” appears when the fast time constant is selected.CH
VFO AS1
5 379204060dB
USB
M4VOX
COMAGC
FAGC
PO5
10
Appears when 
AGC fast is 
selected.
[DISPLAY] [MENU][F-3]
N1 NB LEVEL
This item adjusts the noise blanker level. The noise
blanker level can be adjusted from 0 to 10.
The default is 5.
USB
Although noise blanker level set mode is available in all modes, the noise blanker function is not effective for FM
mode. While M3is selected in all modes, push [
(F-2)NB] for 
1 sec. to enter the noise blanker level set mode.
DNoise blanker level set mode5 
						

							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 operating needs.
Narrow filters for AM/FM modes are standard.
FILTER PRESETTING:
After you install a filter (see p. 87 for installation), you
must specify the installed filter in initial set mode (item
“22 OPT. FIL” ; see p. 79).
FILTER ON/OFF:
qSelect M3.
• Push [DISPLAY] once or twice to select M.
• Push [MENU] one or more times to select M3.
wPush [(F-1)FIL] momentarily to select the narrow
filter; push for 1 sec. to select the wide filter.
•ãappears when the narrow filter is selected; çap-
pears when the wide filter is selected.
NOTE:When selecting the narrow filter (or wide fil-
ter), the graphic passband is changed. (see dia-
gram below)
[DISPLAY] [MENU][F-1]
Normal
operation wide is
selectednarrow is
selected
FL-53A*CW, RTTY250 Hz/–6 dB
CW, RTTY500 Hz/–6 dB
SSB, CW, RTTY1.8 kHz/–6 dB
FL-65SSB, CW, RTTY2.3 kHz/–6 dB
SSB, CW, RTTY2.8 kHz/–6 dB
ModeBandwidthName
FL-222*
FL-52A*
FL-96**
SSB, CW, RTTY3.3 kHz/–6 dBFL-257*
FMNormalThrough (15 k)
NarrowCFWS455G (8 k)
AMNormalCFWS455G (8 k)
NarrowFL-65 (2.4 k)
SSB, CW, RTTY • 
Optional filter installation and selection tables
No optional 
filter
FL-52A
FL-53A
FL-96
FL-222
FL-257———
FL-52A (500)
FL-53A (250)
———
FL222 (1.8 k)
———FL-65 (2.3 k)
FL-65 (2.3 k) 
FL-65 (2.3 k)
FL-65 (2.3 k)
FL-65 (2.3 k)
FL-65 (2.3 k)———
———
———
FL-96 (2.8 k)
———
FL-257 (3.3 k) Bandwidth
Narrow Medium Wide
Filter 
						

							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] [MENU][F-1]
DANF (Automatic Notch Filter) function
DSP Functions (may require an optional unit depending on version—see p. 92)
DNR (Noise Reduction) function
This function reduces noise components and picks
out desired signals which are buried in noise. The re-
ceived AF signals are converted to digital signals and
then the desired signals are separated from the noise.
The noise reduction function is available for all oper-
ating modes.
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 toggle the noise reduction func-
tion ON and OFF.
• “DSP” and “NR” appear when the function is ON.
ePush [(F-3)NRL] to toggle the noise reduction level
indication ON and OFF.
rRotate the [M-CH] control to set the noise reduc-
tion level.
• Set the control for maximum readability. Deep rotation
results in audio signal masking or distortion.
S4  LEVEL  4  NRL
CH VFO APO
S1
5 5 379
20 40
10 60dB
USB
BLANK
DSP
NR NR
CH VFO APO
S1
5 5 379
20 40
10 60dB
USB
BLANK
DSP
S4  ANF  NR    NRL
NR NR
[DISPLAY] [MENU][M-CH][F-2][F-3]
Peak meter hold
The peak meter hold function freezes the highest dis-
played bar segment in any meter function for about
0.5 sec. so that you can more easily read the meter.
This function can be turned ON and OFF in initial set
mode (item “23 PEAK HOLD” ; see p. 79).
S1
5 379204060dB
S1
5 379204060dB
Initial reception of a 
signal results in an 
S-meter reading of 
40 dB.
The highest indica-
ted bar remains dis-
played for about 0.5 
sec. even when the 
signal strength de-
creases.
[EXAMPLE]:
INITIAL SET MODE
5 
						

							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 M1dis-
play.
➥Push [SPL]: activates split only.
➥Push and hold [SPL]: activates the quick split
next page.
eTo change the receive frequency, rotate the main
dial; to change the transmit frequency, rotate the
main dial while pushing [
(F-3)XFC].
• The transmit frequency can be monitored while push-
ing [
(F-3)XFC].
• Split operation is now set for receive on 7.057 MHz/CW
and transmit on 7.025 MHz/CW.
To exchange the transmit and receive frequencies,
push [
(F-2)A/B] in M1.
CONVENIENT
The G3display conveniently shows the transmit fre-
quency during split frequency operation and pushing
[
(F-3)Ñ] allows you to change the transmit frequency.
•Split lock function
The split lock function is convenient for changing only
the transmit frequency. Otherwise, accidentally re-
leasing the [
(F-3)XFC] switch while rotating the main
dial changes the receive frequency. The split lock’s ef-
fectiveness can be selected in initial set mode (item
“25  SPLIT  LOCK”) for both receive and transmit
frequencies; or only the receive frequency. (p. 80)
CHPO
S1
5 5 379
20 40
10 60dB
CW
M1  SPL  A/B  XFC
SPL
VFO B
CH VFO APO
S1
5 5 379
20 40
10 60dB
CW
M1  SPL  A/B  XFC
SPL
CH VFO APO
S1
5 5 379
20 40
10 60dB
CWSPL
M1  SPL  A/B  XFC
[DISPLAY] Main dial [MENU][F-1][F-2][F-3]
Split frequency operation 
						

							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. 79). In this
case, pushing [
(F-1)SPL] for 1 sec. has the same ef-
fect as pushing [
(F-1)SPL] momentarily as in normal
split operation.
PROGRAMMING SPLIT SHIFT FREQUENCY (p.80)
qPush [POWER] to turn power OFF.
wWhile pushing [LOCK], push [POWER] to turn
power ON and enter initial set mode.
eSelect “26  SPL  OFFSET” using [MENU], [M-
CH] or the [Y]/[Z] keys, then rotate the main dial
to select the desired split offset.
• The split offset can be selected from –9.999 MHz to
+9.999 MHz.
VFO A
VFO A
SPL
SPLSPL
SPL
VFO A
VFO B
VFO BNo shift frequency is programmed.
+10 kHz is programmed as a shift
frequency.
Push for 1 sec.
SPL
F-1
[DISPLAY] [MENU][F-1]
26 SPL OFFSET
Meter selection
The bar meter in the function display acts as an
S-meter for relative signal strength during receiving
and can be selected for one of three types during
transmitting.
qSelect M3.
• Push [DISPLAY] once or twice to select M.
• Push [MENU] one or more times to select M3.
wPush [(F-3)MET] one or more times to select the
desired meter function.
• The display indication changes as in the table at right.
[DISPLAY] [MENU][F-3]
DISPLAY
INDICATIONMEASUREMENT
PoIndicates the relative RF output power.
ALC
Indicates the ALC level. When the
meter movement shows the input signal
level exceeds the allowable level, the
ALC limits the RF power. In such cases,
reduce the microphone gain (see
above).
SWRIndicates the SWR over the transmis-
sion line.
6 
						

							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 ‘VOX delay,’ ‘VOX gain’
and ‘ANTI-VOX’ if desired.
rSelect “VOX DELAY” in VOX set mode.
• Push [MENU] one or more times to select V1.
• While speaking into the microphone, adjust ‘VOX
DELAY’ as desired.
tSelect “VOX GAIN” in VOX set mode.
• Push [MENU] one or more times to select V2.
• While speaking into the microphone, adjust ‘VOX GAIN’
until the transceiver is transmitting.
ySelect “ANTI VOX” in VOX set mode.
• Push [MENU] one or more times to select V3.
• If the receive audio from the speaker toggles the trans-
ceiver to transmit during receive, adjust the ‘ANTI-VOX’
to the point where it has no effect.
uPush [DISPLAY] to exit VOX set mode.
[DISPLAY] [MENU][F-1]Main dail
RLSB
CH VFO APO
S1
5 5 379
20 40
10 60dB
USBCW RTTYAM WFM
M4  VOX  COM  AGC
VOXCOM
VOX operation
While M4is selected in SSB/AM/FM modes, push 
[
(F-1)VOX] for 1 sec. to enter the VOX set mode.
DVOX set mode
V1  VOX  DELAY
This item adjusts the VOX (Voice-activated Transmit)
delay time. The delay time can be adjusted from 0 to
2 sec. in 0.1 sec. steps.
The default is 1.0 seconds.
USB
V2 VOX GAIN
This item adjusts the VOX gain for the VOX (voice ac-
tivated transmit) function.
The default is 5.
USB
V3 ANTI VOX
This item adjusts the ANTI-VOX gain for the VOX
(voice activated transmit) function.
The default is 5.
USB 
						

							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 gain.
• While transmitting at your normal voice level, the ALC
meter should read at about the middle of the ALC zone.
• Be sure the mic gain is in the range of 2 to 5.
rSelect the ALC meter.
• Push [DISPLAY] once or twice to select M.
• Push [MENU] one or more times to select M3, then
push [
(F-3)MET] one or more times to select “ALC.”
tPush [MENU] one or more times to select M4.
yPush [
(F-2)COM] to turn the speech compressor
function ON.
• “COM” appears.
uPush [(F-2)COM] for 1 sec. to enter the compres-
sion level set mode (below).
iRotate the main dial to set the speech compression
level.NOTE:When the ALC meter peaks above the ALC
zone, your transmitted voice may be distorted.
ALC
Adjust ‘COMP LEVEL’ so that the ALC meter
reads within the ALC zone.
ALC zone
[DISPLAY] [MENU]
[MODE]
Main dail[F-2][F-3]
RLSB
CH VFO APO
S1
5 5 379
20 40
10 60dB
USBCW RTTYAM WFM
M4  VOX  COM  AGC
VOXCOM
Speech compressor
While M4is selected in SSB/AM modes, push 
[
(F-2)COM] for 1 sec. to enter the compression level set
mode.
DCompression level set mode
C1 COMP LEVEL
This item adjusts the speech compression level. The
speech compression level can be adjusted from 0 to
10.
The default is 5.
USB
6 
						

							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-
tual SWR from the meter:
➠≤1.5 well matched antenna
➠>1.5 check antenna or cable connection, etc.
(B) Plot measurement
Plot measurement allows you to measure the SWR
over an entire band.
qConfirm that the output power is over 5 W.
wPush [DISPLAY] once or twice to select G.
ePush [MENU] one or more times to select G2.
rSet the center frequency for the SWR to be mea-
sured.
tPush and hold [
(F-1)10k] one or more times to se-
lect the desired frequency pitch.
yPush and hold [
(F-2)] one or more times to select
the desired step.
uAfter selecting the desired pitch and step, push 
[
(F-3)STR] to measure the SWR.
• RTTY mode is selected automatically.
iPush and hold [PTT] to display the SWR in a bar
graph readout.
oWhen [PTT] is released, the frequency marker and
frequency indication move to the next frequency to
be measured.
!0Repeat steps iand oto measure SWR over the
entire frequency range.
!1When the measured SWR is less than 1.5, the an-
tenna is well matched.
G2
10kSTR
Frequency span
Step bar indication
Frequency indication mark
Measure start indicator
[DISPLAY] [MENU][F-3]
[F-1]
[F-2]
CH VFO ASWRS1
1 1.5 2 35 379
20 40 60dB
CW
BLANK
SWR 1 1.5 2 3
The best match is in this range.
∞
∞
M3
FIL
NBMET
[DISPLAY] [MENU][F-3]
[MODE]
The antenna is well matched in this range
CH VFO APO
S1
5 5 379
20 40
10 60dBBLANK
G250kSTR
4.0
3.5
3.0
2.5
2.0
1.5
1.0
RTTY
SWR
DMeasuring SWR
SpanPush [F-1] for 1 sec. to change the se-
lected span.
Step barPush [F-2] to change the step bar (3, 5,
7 or 9 steps are available.
MarkerIndicates the currently active step bar.
StartFlashes while the SWR is being mea-
sured.