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

							16
2INSTALLATION AND  CONNECTIONS
External antenna tuners and linear amplifier
Ground GroundLong wire or optional AH-2b
AH-4
ANTIC-703
Coaxial cable
(from the AH-4)
CONNECTING THE AH-4
IC-703
GroundGround
AT-180
CONNECTING THE AT-180
HF
to 6 m
antenna
[TRANSCEIVER][ANT]
[ANT][ACC] [ACC]ACC cable supplied with the AT-180Coaxial cable supplied
with the AT-180one of two
connectors
Note:
Turn the IC-703’s power OFF when connecting 
the AT-180, otherwise, the CPU may malfunction 
and the AT-180 may not function properly.
CONNECTING A NON-ICOM LINEAR AMPLIFIER
RWARNING:
•Set the transceiver output power and linear ampli-
fier ALC output level referring to the linear amplifier
instruction manual. Be sure the linear amplifier key-
ing circuit control voltage is compatible with the IC-
703, before connecting to HSEND line (ACC cable).
•The ALC input level must be in the range 0 V to
–4 V, and the transceiver does not accept positive
voltage. Non-matched ALC and RF power settings
could cause a fire or damage the linear amplifier.•The specifications for the SEND relay are 16 V
DC 0.5 A. If this level is exceeded, a large external
relay must be used.
HSEND
(Orange) ALC (Blue)
13.8V (Gray)Ground
Relay RF IN RF OUT
ALC
SEND
ANT
ACC cableACC IC-703
50 Ω coaxial cable
To an 
antenna
2 
						

							3
17
BASIC OPERATION
When first applying power (CPU resetting)
Before first applying power, make sure all connections
required for your system are complete by referring to
Chapter 2. Then, reset the transceiver using the fol-
lowing procedure.
Resetting CLEARSall programmed contents in
memory channels and returns all initial set mode and
quick set mode contents to their default values.
qMake sure the transceiver power is OFF.
wWhile pushing [Y] and [Z], push [POWER] to turn
power ON.
•“CLEAR ? OK” appears as shown at right.
eThen push [F-3] for 1 sec to start resetting.
• The internal CPU is reset.
• The display changes to ‘All indication,’ ‘RF power,’ ‘Power
supply voltage’ and ‘Initial frequency and Mode’ as shown
at right.
DM1display selection
If you can’t figure out how to return to the M1display:
While pushing [MENU], turn power ON.
Initial settings
After resetting the transceiver, set controls and
switches as shown in the diagram below.
[POWER]
[Y]
[Z]
CLEAR  ?    OK
F 3
Push [F-3] 
for 1 sec.
NWRLSB
NB VOX F-BK COM FCH VFO A DUP
VFO B
MEMOAGCALC
SWR POS1
11.52 355 379
20 40
10 60dB
USB CW RTTYAM WFM TSQLSPL
S∞
NRANFBLANK
DSP
CH VFO APOS1
5 5 379
20 40
10 60dB
USB
BLANK
M1  SPL  A/B  XFC   DC SUPPLY
      RF  POWER
The transceiver’s 
initial frequency and mode
BAND
BANDMODE
TS
DISPLAY
LOCK
F 1 F 2 F 3
AF RF SQL
RIT
SHIFT M-CHSUB
PHONESTUNER P.AMP
AT T
Y
ZPOWER
MENU
TX RX
[AF]: Max. CCW
[RF/SQL]: Center
[LOCK]: OFF
(indicator light out) [POWER]: OFF
[SHIFT]: Center
[P.AMP/ATT]: OFF
(indicator lights out)
[TUNER]: OFF
(indicator lights out)
[RIT/SUB]: OFF
(indicator lights out)
CCW : counterclockwise
Turn power ON, then check the display. If any of the
following indicators appear, turn them OFF as follows:
• Tuning step indicators, 
Z, (SSB, CW or RTTY):
Push [TS].
• MHz tuning step indicator, 
Z, (FM or AM):
Push [TS].
• 1 Hz frequency readout (SSB, CW or RTTY):
Push and hold [TS].• Memory mode indicator, MEMO:
Use [
(F-3)V/M] in the M2display (p. 75).
• Split indicator, ä:
Use [
(F-1)SPL] in the M1display (p. 75). 
						

							18
3BASIC OPERATION
VFO description 
VFO is an abbreviation of Variable Frequency Oscilla-
tor, and traditionally refers to an oscillator. The IC-703’s
VFO can store a frequency and an operating mode.
You can call up a desired frequency to a VFO with the
memo pad-read switch (p. 60) or with the memory
transfer switch (p. 58). You can also change the fre-
quency with the main dial and select an operating
mode with the [MODE] switch or call up previously ac-
cessed frequency and modes with the band stacking
register (p. 22).
The IC-703 has two VFOs, specially suited for split fre-
quency operation. The VFOs are called VFO A and
VFO B. You can use the desired VFO to call up a fre-
quency and operating mode for operation.
CH
VFO A USB
M1
SPL
A/BXFC
VFOMODE
SWITCH
MEMORY
CHANNELDIAL
MEMO PAD
28.025 MHz
7.001 MHz21.295 MHzBANDSelect
Change
Transfer
TransferTransfer
DThe differences between VFO and memory mode
VFO MODE
Each VFO shows a frequency and operating mode. If
the frequency or operating mode is changed, the VFO
automatically memorizes the new frequency or oper-
ating mode.
When the VFO is selected from another VFO or
memory mode, the last-used frequency and operat-
ing mode for that VFO appear.
[EXAMPLE]MEMORY MODE (pgs. 56–60)
Each memory channel shows a frequency and oper-
ating mode like a VFO. Even if the frequency or mode
is changed, the memory channel does not memorize
the new frequency or operating mode.
When a memory channel is selected from another
memory channel or VFO mode, the memorized fre-
quency and operating mode appear.
[EXAMPLE]
CH
VFO A USB
CH
VFO A USB
VFO is selected.
The frequency is changed.
MEMO
CH
VFO A USB
VFO is selected again.
Changed frequency (14.123 MHz) appears. Changed frequency (14.123 MHz) does not appear and 
memorised frequency (14.100 MHz) appears instead.
CH
USBMemory mode is selected.
CH
USB
CH
USB
Memory channel 1 is
selected.
The frequency is changed.
MEMO
MEMO MEMO MEMO
CH
USBMemory channel 1 is
selected again.
CH
USBAnother memory channel
is selected.
3 
						

							19
3BASIC OPERATION
•Programmable tuning steps
Programmable tuning steps are available to suit your
operating requirements.
These tuning steps are:
• Independently selectable for each mode
• Selectable from 0.01 (FM/AM only), 0.1, 1, 5, 9, 10,
12.5, 20, 25 and 100 kHz
qPush [TS] one or more times until the programma-
ble tuning step indicator “
Z” appears above the 1
kHz digit.
• Rotating the main dial changes the frequency according
to the set tuning step.
wPush [TS] for 1 sec. while the programmable tuning
step indicator appears to enter the tuning step se-
lection mode.
•“Rotate DIAL” appears.
eRotate the main dial to set the desired tuning step.
• Change the mode and select tuning steps for other
modes, if desired.
rPush [TS] to exit the tuning step selection mode.
tRotate the main dial to change the frequency ac-
cording to the set tuning step.
•Band selection
All HF ham bands, the 50 MHz band and a general
coverage receiver band are included in the IC-703.
Push [
(Y)BAND]/[(Z)BAND] to select the desired
band.
• Pushing [(Y)BAND]/[(Z)BAND] continuously scrolls
through the available bands.
The band stacking register can also be used to se-
lect bands. Refer to p. 22.
USB
FM
USB
USB
LSB
Z
Z
Frequency setting
Programmable tuning
step indicator
10 kHz tuning step is
selected for USB
operation.
CH
VFO A
PO
S1
5 5 3792040
10 60dB
USB
USB
M1 A/B XFC
DIAL SPL
Rotate
[Y]
[Z]
[TS]Main dial 
						

							20
3BASIC OPERATION
•1 Hz and 10 Hz tuning steps
When neither the quick tuning step or programmable
tuning step “
Z” appear, rotating the main dial
changes the frequency in increments of 1 or 10 Hz.
These tuning steps are only available in SSB, CW
and RTTY modes.
qSelect SSB, CW or RTTY mode if necessary.
wPush [TS] for 1 sec. to toggle between the 1 Hz
and 10 Hz step settings.
• When the 1 Hz step is selected, the 1 Hz digit appears
in the frequency indication; when the 10 Hz step is se-
lected, the 1 Hz digit disappears from the frequency in-
dication.
• Rotating the main dial changes the frequency 1 Hz or
10Hz tuning step.
Rotating the main dial
changes the frequency
in 10 Hz steps.
Rotating the main dial
changes the frequency
in 1 Hz steps. TS
Push
for 1 sec.
VFO A USB
VFO A USB
[TS] [MODE]Main dial
•1 MHz quick tuning step
The quick tuning step function allows you to change
the frequency in 1 MHz steps when rotating the main
dial. This function is only available in FM and AM
modes.
qSelect FM or AM mode if necessary.
wPush [TS] momentarily to toggle between the 1
MHz tuning step and the programmable tuning
step.
•“Z” appears above the 1 MHz indicator when the 1
MHz tuning step is selected.
• Rotating the main dial changes the frequency 1 MHz or
set tuning step.
Quick tuning step
indicator
FM
FM
Rotating the main dial 
changes the frequency 
in 1 MHz steps.
[TS] [MODE]Main dial
3 
						

							21
3BASIC OPERATION
•Sub dial function
The sub dial function allows you to change the oper-
ating frequency using the [M-CH] control. This gives
you more control in tuning since the [M-CH] knob is
detented—each click changes the frequency accord-
ing to the set tuning step. This function is always
available in FM and AM modes. However, in SSB,
CW and RTTY modes, the initial set mode item “21
SUB DIAL” (p.61), must be set to “FrEq.”
qPush [RIT/SUB] to turn the sub dial function ON.
• The [SUB] indicator lights green; if it lights red, the RIT
function is activated—sub dial function must be set in
initial set mode in this case.
wRotate [M-CH] to change the operating frequency
according to the set tuning step.
ePush [RIT/SUB] again to turn the function OFF.
• The [SUB] indicator turns off.[RIT/SUB][M-CH]
RIT/
SUBIndicator lights green 
while the sub dial 
function is activated.
• [TS] switch flow chart
SSB/CW/RTTY modes Any mode FM/AM modes
TSUSB
10 Hz tuning
USB
1 Hz tuningmomentarily momentarily
momentarily1 sec. 1 sec.
1 sec.TS
TSTS
1 MHz tuning
USB
Programmable step tuning
(100 Hz –100 kHz)
Selectable for each mode.
USB
Rotate DIAL
FM
Appears
AppearsAppears 
						

							22
3BASIC OPERATION
•Quick band change function
The quick band change function automatically stores
the last frequency and mode used for each band in a
band stacking register. This is convenient for contest
operation, etc. The tables below show the quick band
change default settings for each band.
qSelect S3.
• Push [DISPLAY] once or twice to select S.
• Push [MENU] one or more times to select S3.
wPush [F-1], [F-2] or [F-3] to select a band stacking
register.
• The default settings for [F-1], [F-2], [F-3] are 7, 14, 21
MHz bands, respectively.
eTo change the settings for [F-1], [F-2] or [F-3] from
their defaults, push [F-1], [F-2] or [F-3] for 1 sec.
one or more times to until the desired band ap-
pears in the display above the corresponding
switch.
• The last-used frequency and mode for the selected
band are displayed.
*
11.83000 MHz for Italy version (#10, #20).
*250 MHz band is not available for some version.
*3General refers to the general coverage receiver (GENin
the display) and the range varies according to version.
BLANK
CH
VFO AS1
5 379204060dB
USB
S3
7
GEN21
PO5
10
Display shows [F-2] 
has been changed 
from its default of the 
14 MHz band to the 
general receiver band.
BLANK
CH
VFO AS1
5 379204060dB
USB
S3
7
 1421
PO5
10
Display shows the 
default bands for the 
quick band change 
function.
[DISPLAY][F-2][MENU]
[F-3][F-1]
BAND FREQUENCY MODE
1.9 MHz 1.90000 MHz*
1CW
3.5 MHz 3.55000 MHz LSB
7 MHz 7.05000 MHz LSB
10 MHz 10.12000 MHz CW
14 MHz 14.10000 MHz USB
18 MHz 18.10000 MHz USB
21 MHz 21.20000 MHz USB
24 MHz 24.95000 MHz USB
28 MHz 28.50000 MHz USB
50 MHz*
250.10000 MHz USB
General*
315.00000 MHz USB
3 
						

							Volume setting
23
3BASIC OPERATION
Operating mode selection
The following modes are available in the IC-703:
SSB (LSB/USB), CW, CW-å(CW reverse), RTTY
and åRTTY (RTTY reverse), FM, AM.
•SSB (LSB/USB), CW, RTTY, SSB-D, FM and
AM modes selection
To select the desired mode of operation, push
[MODE] one or more times, then push [MODE] for 1
sec., if necessary. See the diagram at right for the
order of selection.
• The selected mode is indicated in the function display.
•CW-å(CW reverse) mode selection
qWhen selecting CW mode, push [DISPLAY] for 1
sec. to enter quick set mode.
wPush [MENU] one or more times to select item “Q3
CW REV” during CW mode.
•[Y]/[Z] or [M-CH] can also be used.
eRotate the main dial to select CW reverse.
rPush [DISPLAY] to exit quick set mode.
•“CW-å” appears.
•åRTTY (RTTY reverse) mode selection
qWhen selecting RTTY mode, push [DISPLAY] for 1
sec. to enter quick set mode.
wPush [MENU] one or more times to select item “Q2
RTTY REV” during RTTY mode.
•[Y]/[Z] or [M-CH] can also be used.
eRotate the main dial to select RTTY reverse.
rPush [DISPLAY] to exit quick set mode.
•“åRTTY” appears.
Note:If a desired mode cannot be selected, it may be
hidden using initial set mode (p. 76).
[DISPLAY][MODE][MENU][M-CH]
[Y]
[Z]
OPERATING MODE SELECTION
MODE
Push
momentarily Memory keyer
set mode
MODE
Push
for 1 sec. USB LSB
FM AM
SSB-D
CW
RTTY
[MODE]
Rotate [AF] control to output a suitable audio level.[AF]
AF RF/SQL
No audio output
Max. audio output
Decreases Increases 
						

							24
3BASIC OPERATION
Squelch and receive (RF) sensitivity
Adjusts the RF gain and squelch threshold level. The
squelch removes noise output from the speaker
(closed position) when no signal is received. 
• The squelch is particularly effective for FM mode. It is also
available for other modes.
• The control can be set as the RF gain control only
(squelch is fixed open) or squelch control (RF gain is fixed
at maximum) in initial set mode (p. 79). See below right.
• The 11 to 12 o’clock position is recommended for any set-
ting of the [RF/SQL] control.
Adjusting RF gain (Receive sensitivity)
Normally, [RF/SQL] is set to the 11 o ’clock position.
Rotate [RF/SQL] to the 11 o’clock position for maxi-
mum sensitivity. 
• Rotating counterclockwise from the maximum position re-
duces sensitivity.
• The S-meter indicates receive sensitivity.
Adjusting squelch (Removing non-signal noise)
Rotate [RF/SQL] clockwise when receiving no signal,
until the noise just disappears.
• [RX] indicator light goes out.
• Rotating [RF/SQL] past the threshold point invokes the S-
meter squelch— this allows you to set a minimum signal
level needed to open the squelch.
•When setting as RF gain/squelch control
•When functioning as RF gain control 
(Squelch is
fixed open; SSB, CW, RTTY only)
•When functioning as squelch control (RF gain is
fixed at maximum)
Squelch is 
open.S-meter 
squelchS-meter squelch
threshold Noise squelch 
threshold 
(FM mode)
Shallow DeepNoise squelch (FM mode)
Minimum RF gainAdjustable
rangeMaximum 
RF gain
Recommended level
RF gain 
adjustable
rangeMaximum 
RF gain
S-meter 
squelch
Noise squelch (FM mode)
Squelch is 
open.
[RF/SQL]
SET MODE OPERATION
RF+SQLCan be used in all modes.
(default)Functions as noise squelch or S-meter
squelch in AM and FM modes; S-
meter squelch only in other modes.
SQLOperates as a squelch control.
• RF gain is fixed at maximum sensitivity.
Operates as an RF gain control in
SSB, CW and RTTY modes.
AUTO
• Squelch is fixed open.
Operates as a squelch control in AM
and FM modes.
• RF gain is fixed at maximum sensitivity.
3 
						

							Basic transmit operation
DTransmitting
25
3BASIC OPERATION
qPush [PTT] (microphone) to transmit.
• The [TX] indicator lights red.
wRelease [PTT] (microphone) to return to receive.
[PTT]
HM-103
Before transmitting, monitor your selected op-
erating frequency to make sure transmitting
won’t cause interference to other stations on
the same frequency. It’s good Amateur practice
to listen first, and then, even if nothing is heard,
ask “is the frequency in use” once or twice, be-
fore you begin operating on that frequency.
Dial lock function
The dial lock function prevents accidental changes
caused by the tuning dial.
➥Push [LOCK] to turn the dial lock function ON and
OFF.
• “LOCK” indicator lights while the dial lock function is
activated.
Lights while the dial lock function is activated.
[LOCK]
DMaximum output power
qPush [POWER] for 1 sec. to turn power OFF.
wWhile pushing [LOCK], push [POWER] to turn
power ON and enter initial set mode.
ePush [MENU] one or more times to select “1 MAX
POWSET,” if necessary.
• [M-CH] or [Y]/[Z] can also be used.
rRotate the main dial to select the desired maximum
output power.
• Maximum output power is selectable “0.5,” “1,” “2.5,” “5”
or “10.”
• Default setting is “10.”
tPush [POWER] to turn power OFF, and ON again.
  1  MAX  POWSET
[M-CH][LOCK][MENU]
[POWER]
[Y]
[Z]