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

							15
86
OPTION UNIT INSTALLATIONS AND SETTINGS
Opening the transceiver case
To remove the transceiver case unscrew the 18 screws
(5 in the top panel, 5 in the bottom panel, 8 in the side
panels: 4 pieces each) as shown in the diagram below.
UT-102 VOICE SYNTHESIZER UNIT
The UT-102 announces the accessed band’s fre-
quency, mode, etc. (S-meter level can also be an-
nounced—p. 82) in a clear, electronically generated
voice, in English (or Japanese).
qRemove the top cover as shown above.
wConnect the UT-102 as shown in the diagram at
right (label side up).
eReplace the top cover.
D
D
Operation
qSelect the desired announcing condition, such as
speed, language, contents, in initial set mode.
(p. 82)
wPush [LOCK] for 1 sec. (until “zero” is announced)
to announces the selected contents.
✔Adjusting the announcing audio level
➥Adjust the R7205 on the MAIN unit .
UT-102
MAIN unit
R7205
[LOCK]
Caution:Disconnectthe DC power cable from
the transceiver before performing any work on the
transceiver.
Top cover
Speaker
cable
Bottom cover
14
15 
						

							87
15OPTION UNIT INSTALLATIONS AND SETTINGS
IF filter
Several IF filters are available for the IC-703. Choose
a filter most appropriate to your operating needs.
NOTE:After filter installation, specify the installed
filter using initial set mode (item 22, p.79). Other-
wise, the installed filter will not function properly.
FL-52A
CW/RTTY NARROW FILTER500 Hz/–6 dB
FL-53A
CW NARROW FILTER250 Hz/–6 dB
FL-222 
SSB NARROW FILTER1.8 kHz/–6 dB
FL-257 
SSB WIDE FILTER3.3 kHz/–6 dB
qRemove the top cover as shown on the previous
page.
wDisconnect the coaxial cable connectors, P2 and
P4, then unscrew 10 screws on the MAIN unit.
• Attach the grounding spring at the same place when re-
turning.
eSlide the MAIN unit in the direction of the arrow q,
then open the MAIN unit in the direction of the
arrow w.
• Be careful for the flat cables.
rInstall the desired filter as shown in the diagram
below.
tTighten the nuts then solder the filter’s pins.
yReturn the MAIN unit to the original position.
• Make sure to attach the grounding spring to the original
position.
uConnect P2 and P4 to J2 and J1, respectively.
iReplace the top cover.
Soldering points
Nuts
Flat washers Optional
IF filter
Red belt
Flat cable Grounding
spring Front side
Rear side
P2 (J2)
P4 (J1)
q w 
						

							88
15OPTION UNIT INSTALLATIONS AND SETTINGS
UT-106 DSP RECEIVER UNIT
qOpen the transceiver top cover as shown on p. 86.
wRemove the 4-pin connector (P2451) from main
CPU shielding case on the MAIN unit (top side)
and plug it into J1 of the UT-106.
ePlug the 4-pin connector (P1) from the UT-106 into
J2451 on the MAIN unit.
rPlug the supplied flat cable into J3 on the UT-106
and J2453 on the MAIN unit.
• Be careful of the orientation of the flat cable.
tAttach the UT-106 to the main CPU shielding case,
using the existing guide for alignment, as illustrated
at right above
yReassemble the transceiver.
P1
(UT-106)
J2451
J2453J3
Flat cable
P2451J1
UT-106Front sideJ2451
Front side
MAIN unit
(top side)Main CPU 
shielding case
P2451
MB-72 CARRYING HANDLE
The optional MB-72 CARRYING HANDLEis convenient
when carrying the transceiver for DX’peditions, field
operation, etc.
qTighten the supplied screws plus rubber feet as
shown below.wAttach the MB-72 to the left side of the transceiver
as shown below.
Carrying handleRubber
feet
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							89
15OPTION UNIT INSTALLATIONS AND SETTINGS
AT-180 internal switch description
The optional AT-180 has 3 operating conditions for HF
band operation. Select a suitable condition according
to your antenna system.
qRemove the top cover of the AT-180.
wSet the tuner switches to the desired positions ac-
cording to the table below.
•Specifications for the AT-180
• Frequency coverage : 1.9 – 54 MHz
• Input impedance : 50 Ω
• Maximum input : 120 W
power
• Minimum tuning : 8 W
power
• Matching impedance : 16.7–150 Ω
(HF band)
range 20 –125 Ω(50 MHz band)
• Tuning accuracy : Less than SWR 1.5:1
• Insertion loss : Less than 1.0 dB
(after tuning)
• Power supply : 13.8 V DC/1 A(supplied from
requirementsthe transceiver’s ACC socket)
• Dimensions (mm/in): 167(W)×58.6(H)×225(D)
69⁄16(W)×25⁄17(H)×87⁄8(D)
• Weight : 2.4 kg; 5 lb 4 oz
• Supplied accessories : coaxial cable 
(1 m),
ACC cable 
(DIN 13 pins)
•AT-180 inside top cover
•Connector information for ACC(2) socket
S2 S1
DC BA
ACC 212
3 4
7 65
PIN NO./NAMEDESCRIPTION
q8 VRegulated 8 V output.
(10 mA max.)
wGNDConnects to ground.
eSEND
Input/output pin.
Goes to ground when transmitting (20 mA
max). When grounded, transmits.
rBANDBand voltage output.
(Varies with amateur band; 0 to 8.0 V).
tALCALC output voltage (–4 to 0 V).
yNCNo connection.
u13.8V13.8 V output when power is ON (1 A max).
SWPositionOperation
S1
A(default)
The tuner operating condition is set by S2
described below.
B
THROUGH INHIBIT
The tuner tunes the antenna even when the
antenna has poor SWR (up to VSWR 3:1
after tuning). In this case, manual tuning is
necessary each time you change the fre-
quency although the tuner automatically
starts tuning when the VSWR is higher than
3:1. This setting is called “through inhibit,”
however, the tuner is set to “through” if the
VSWR is higher than 3:1 after tuning.
S2
C
TUNER SENSITIVE CONDITION
The tuner tunes each time you transmit (ex-
cept SSB mode). Therefore, the lowest
SWR is obtained at any given time.
For SSB mode, the same condition as the
“D” position.
D(default)
NORMAL CONDITION
The tuner tunes when the SWR is higher
than 1.5:1. Therefore, the tuner activates
only when tuning is necessary. 
						

							16
90
SPECIFICATIONS
General
• Frequency coverage : Receive
30 kHz – 60.00000 MHz*
Transmit
1.800 – 1.99999 MHz*
3.500 – 3.9999 MHz*
7.000 – 7.300 MHz*
10.100 – 10.150 MHz
14.000 – 14.350 MHz
18.068 – 18.168 MHz
21.000 – 21.450 MHz
24.890 – 24.990 MHz
28.000 – 29.700 MHz
50.000 – 54.000 MHz*
*Depending on version.
• Mode : SSB, CW, AM, FM, RTTY
• Number of memory : 105 
(split memory: 99; scan edges: 6)
channels
• Antenna connector : SO-239 /50 Ω
• Usable temperature : –10°C to +60°C (+14°F to +140°F)
range
• Frequency stability : Less than ± 0.5 ppm
(0°C to + 50°C; + 32°F to +122°F).
• Power supply : 9–15.87 V DC (negative ground)
requirement
• Current drain :
Transmit 2.0 A typ. 
(TX 5 W at 9.6 V DC)
3.0 A typ. (TX 10 W at 13.8 V DC)
Receive squelched 300 mA typ. (at 9.6 V DC)
max. audio 450 mA typ. (at 9.6 V DC)
1.2 A(at 13.8V DC)
• Dimensions : 167(W)×58(H)×200(D) mm, 
(projections not included)69⁄16(W)×25⁄16(H)×77⁄8(D) in
• Weight : 2.0 kg (4 lb 4 oz)
• CI-V connector : 2-conductor 3.5 (d) mm (
1⁄8˝)
• ACC connector : 13-pin
Transmitter
• Output power :
SSB, CW, FM, RTTY 0.1–5 W 
(at 9.6 V DC)
0.1–10 W (at 13.8 V DC)
AM 0.1–2 W (at 9.6 V DC)
0.1–4 W (at 13.8 V DC)
• Modulation system :
SSB Balanced modulation
AM Low level modulation
FM Variable reactance modulation
• Spurious emissions : Less than – 60 dB*
*spurious freq.: below 30 MHz: –50 dB; above 50 MHz: –60 dB
• Carrier suppression : More than 40 dB
• Unwanted sideband : More than 50 dB
• Microphone : 8-pin modular jack (600 Ω)
connector
• KEY connector : 3-conductor 6.35 (d) mm (
1⁄4)
Receiver
• Receive system :Double-conversion superheterodyne
• Intermediate frequencies:
1st 64.455 MHz
2nd 455 kHz
• Sensitivity 
at pre-amp ON (typical):
• Squelch sensitivity 
(threshold; preamp ON):
SSB/CW/RTTY/AM Less than 5.6µV
FM Less than 0.32µV
• Selectivity*
(typical):
SSB/CW More than 2.4 kHz/–6 dB
Less than 4.0 kHz/–60 dB
AM/FM-N More than 9.0 kHz/–6 dB
Less than 20.0 kHz/–50 dB
FM More than 15.0 kHz/–6 dB
Less than 30.0 kHz/–50 dB
*Without optional filter and with mid
band selected.
• Spurious and image rejection ratio:
HF bands More than 70 dB
50 MHz band More than 65 dB 
(except IF through)
• Audio output power : More than 0.5 W at 10% distortion
with an 8 Ωload (at 9.6 V DC)
More than 1.0 W at 10% distortion
with an 8 Ωload (at 13.8 V DC)
• RIT variable range : ±9.99 kHz max.
• PHONES connector : 3-conductor 3.5 (d) mm (1⁄8˝)/8 Ω
• EXT SP connector : 2-conductor 3.5 (d) mm (1⁄8˝)/8 Ω
Antenna tuner
• Matching impedance range:
HF bands 16.7 to 150 Ωunbalanced
(Less than VSWR 3:1)
50 MHz band 20 to 125 Ωunbalanced
(Less than VSWR 2.5:1)
• Tuning accuracy : VSWR 1.5:1 or less
• Insertion loss  : Less than 1.0 dB 
(after tuning)
Frequency
rangeSSB/CW/RTTY10 dB S/NAM10 dB S/NFM12 dB SINAD
0.5–1.8 MHz—13 µV—
1.8–28 MHz0.16 µV2.0 µV—
28–29.7 MHz0.5 µV
50–54 MHz0.13 µV1.0 µV0.25 µV
15
16 
						

							MB-63MOUNTING BRACKET
Metal plate for attaching the front panel to a
wall or other such flat surface.
17
91
OPTIONS
AT-180HF/50 MHz AUTOMATIC
ANTENNA TUNER
Fully automatic antenna tuner with preset
memories for each 100 kHz. Unique “auto-
matic tuner on” function is available. See
p. 89 for AT-180 specifications.
HM-103HAND MICROPHONE
Standard hand microphone.
AH-4HF AUTOMATIC ANTENNA
TUNER
Specially designed to tune a long wire an-
tenna for portable or mobile HF/50 MHz op-
eration. The “PTT tune” function provides
simple operation.
• Input power rating: 150 W
AH-2bANTENNA ELEMENT
A 2.5 m long antenna ele-
ment for mobile operation
with the AH-4.
• Frequency coverage
7–54 MHz band with the
AH-4
Optional filters
FL-52ACW/RTTY NARROW FILTER 
(500 Hz/–6 dB)
FL-53ACW NARROW FILTER 
(250 Hz/–6 dB)
FL-222SSB NARROW FILTER 
(1.8 kHz/–6 dB)
FL-257SSB WIDE FILTER 
(3.3 kHz/–6 dB)
SM-20DESKTOP MICROPHONE
Includes [UP]/[DOWN] switches and a low
cut function. The OPC-589 is necessary to
use this microphone.
SP-7EXTERNAL SPEAKER
Compact speaker for base station opera-
tion. Height can be adjusted for your conve-
nience.
• Input impedance: 8 Ω
• Max. input power: 5 W
CT-17CI-V LEVEL CONVERTER
UNIT
For remote transceiver control using a per-
sonal computer equipped with an RS-232C
port. You can change frequencies, operat-
ing mode, memory channels, etc., via your
computer.
SP-10EXTERNAL SPEAKER
External speakers suitable for mobile oper-
ation.
SP-12: Slim-type; 8 Ω/3 W
SP-10: Compact-type; 4 Ω/5 W
MB-62
MOBILE MOUNTING BRACKET
Mounts the transceiver main body, with or
without the front panel, inside a vehicle.
UT-102VOICE SYNTHESIZER UNIT
Announces the receive frequency, mode
and S-meter level in a clear, electronically-
generated voice in English (or Japanese). 
						

							92
17OPTIONS
BP-228 
Ni-Cd BATTERY PACK (9.6 V, 2800 mAh)
Provides outdoor operation (max. output power 5 W).
OPC-1248 DC POWER ADAPTOR CABLEProvides to connect PS-125. Connects 3-pin DC cable (OPC-1229) to 6-pin connector.
MB-65MOUNTING BASE
Allows you to conveniently vehicle-mount
the front panel of the IC-703. An MB-63
must be used in combination with the MB-
65.
OPC-598ACC 13-PIN CABLE
Required when using the AT-180.
MB-72CARRYING HANDLE
Convenient when carrying the transceiver.
OPC-581/587
SEPARATION CABLE
Provide front panel detached operation for
mobile installations or compact transceiver
operation.
• OPC-581: 3.5 m (11.5 ft)
• OPC-587: 5 m (16.4 ft)
OPC-589
MICROPHONE ADAPTOR  CABLE
Conversion between 8-pin modular and 8-
pin metal connector for using a desktop mi-
crophone with the IC-703.
OPC-599ADAPTOR CABLE
13-pin, ACC connector to 7-pin + 8-pin ACC
connector.
PS-125 DC POWER SUPPLY
Light weight switching regulator power sup-
ply. The OPC-1248 is necessary to use this
power supply.
• Output voltage: 13.8 V
• Max. current drain: 25 A
UT-106 DSP RECEIVER
Provides AF DSP functions such as noise
reduction and auto notch.
Built-in to some versions.
LC-156 
MULTI-BAG (with controller case)
17 
						

							18
93
MENU GUIDE
CI-V ADDRES
CURRENT IP
Initial set mode
No. Indication Description
1 MAX POWSET
2 PoSAVE MODE
3 SIMPLE MODE
4 MODE SELECT
5 MODE POWSET
6 BEEP
7 BAND BEEP
8 BEEP LEVEL
9 BEEP LIMIT
10 CW NOR SIDE
11 SID-T LEVEL
12SID-T LIMIT
Max. output power setting
Power save setting
Simple mode setting
Mode availability
Power setting for mode
Confirmation beeps
Band edge beeps
Beep level adjustment
PTT tune function
Tuner switch condition
Packet data speed CW side tone levelSplit offset frequency
Noise blanker in AM mode
No. Indication Description
13 SYNC TUNING
Available memo pads
14 BACK LIGHT
15 KEY LIGHT
16 LIGHT TIMER
18LED BRIGHT 17
19 18
21
22 20AUTO OFF
SUB DIAL
OPT. FIL RF/SQL
Scanning speed
23 PEAK HOLD
24 QUICK SPLIT
25 SPLIT LOCK
26 SPL OFFSET
27 SCAN RESUME
28 SCAN SPEED
29 U/D SPEED
30 AM NB
31
A-TUNE STRT 32
PTT TUNE 33
TUNER SW 34
35
369600 MODE
37SPEECH LANG
38SPEECH SPD
39S-LVL SPCH
40
41
42
43
CI-V 731 CI-V TRN CI-V BAUD
CW side tone level limit
Frequency shift setting
Display backlighting
Key/switch backlighting
Light timer setting
LED brightness
Automatic power OFF
Current intercept point
Sub dial setting
Optional filter selection RF gain/squelch controlSplit lock function Peak meter hold setting
Quick split function
Beep audio level limit
CW carrier point setting[UP]/[DN] speed Scan resume condition
PAD CH
PWR ON CHK
Power ON check function
Auto tune start function
Voice synthesizer lang.
Voice synthesizer speed
S-meter level speech
CI-V address setting
CI-V data length CI-V transceive Data transfer rate
+ power ONPower OFF then ON to exit initial set mode.
MENU
Y
Z
LOCK
*When “3 SIMPLE MODE” is set to ON,  box items are undisplayed. 
						

							94
18MENU GUIDE
M1 SPL A/B XFC
M2 MW MCL V/M
M3 FIL NB MET
M4 VOX COM AGC
VOX M4 COMTON
TON 1/4 1/4
M4 AGCKEY M4 AGC
S1 MW MPW MPR
S2 SCN PRI
SELV/M
Quick set mode
For 1 sec.
(SSB/AM)(in memory
 mode)
(CW)
(RTTY)
(FM)
S3 7 14 21
S4 ANF NR NRL
G1 BAND scope
G2 SWR Graph
G3 TX freq.
G4 Memory name
1/4 M4 AGC(SSB-D)
DISPLAY
DISPLAY
DISPLAYDISPLAY
MENU
MENU
Y
Y
M-CH
No.
Q1 RF POWER RF POWER RF POWER
Q2 MIC GAIN KEY SPEED
RTTY REV
Q3CARRIER 
Frq*
1CW REV SSB/AM/FM
modeCW
modeRTTY
mode
RF POWER
CAR SIDESSB-D
mode
*1SSB mode only
MODE
DISPLAY
MENU
MENU
18 
						

							19
95
ABOUT CE
INSTALLATION NOTES
For amateur base station installations it is recom-
mended that the forwards clearance in front of the an-
tenna array is calculated relative to the EIRP (Effective
Isotropic Radiated Power). The clearance height below
the antenna array can be determined in most cases
from the RF power at the antenna input terminals.
As different exposure limits have been recommended
for different frequencies, a relative table shows a
guideline for installation considerations.
Below 30 MHz, the recommended limits are specified
in terms of V/m or A/m fields as they are likely to fall
within the near-field region. Similarly, the antenna may
be physically short in terms of electrical length and that
the installation will require some antenna matching de-
vice which can create local, high intensity magnetic
fields. Analysis of such MF installations is best consid-
ered in association with published guidance notes
such as the FCC OET Bulletin 65 Edition 97-01 and its
annexes relative to amateur transmitter installations.
The EC recommended limits are almost identical to the
FCC specified ‘uncontrolled’ limits and tables exist that
show pre-calculated safe distances for different an-
tenna types for different frequency bands. Further in-
formation can be found at http://www.arrl.org/.
•Typical amateur radio installation
Exposure distance assumes that the predominant ra-
diation pattern is forwards and that radiation vertically
downwards is at unity gain (sidelobe suppression is
equal to main lobe gain). This is true of almost every
gain antenna today. Exposed persons are assumed to
be beneath the antenna array and have a typical
height to 1.8 m.
The figures assume the worst case emission of con-
stant carrier.
For the bands 10 MHz and higher the following power
density limits have been recommended:
10–50 MHz 2 W/sq mEIRP clearance heights by frequency band
1 Watts 2.1 m
10 Watts 2.8 m
25 Watts 3.4 m
100 Watts 5 m
1000 Watts 12 m
Forward clearance, EIRP by frequency band
100 Watts 2 m
1000 Watts 6.5 m
10,000 Watts 20 m
100,000 Watts 65 m
In all cases any possible risk depends on the transmit-
ter being activated for long periods. (actual recom-
mendation limits are specified as an average during 6
minutes) Normally the transmitter is not active for long
periods of time. Some radio licenses will require that a
timer circuit automatically cuts the transmitter after 1–2
minutes etc.
Similarly some types of transmitter, SSB, CW, AM etc.
have a lower ‘average’ output power and the assessed
risk is even lower.
Versions of the IC-703 which display the
“CE” symbol on the serial number seal,
comply with the essential requirements of
the European Radio and Telecommunication
Terminal Directive 1999/5/EC.
This warning symbol indicates that this
equipment operates in non-harmonised fre-
quency bands and/or may be subject to li-
censing conditions in the country of use. Be
sure to check that you have the correct ver-
sion of this radio or the correct programming
of this radio, to comply with national licens-
ing requirement.