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

							66
9ANTENNA TUNER OPERATION
The AH-4 matches the IC-703 to a long wire antenna
more than 7 m/23 ft long (3.5 MHz and above).
• See p. 16 for connection.
• See the AH-4 instruction manual for AH-4 installation and
antenna connection details.
NEVERoperate the AH-4 without an antenna wire.
The tuner and transceiver will be damaged.
NEVERoperate the AH-4 when it is ungrounded.
Transmitting before tuning may damage the trans-
ceiver. Note that the AH-4 cannot tune when using a
1⁄2λ long wire or multiple of the operating frequency.AH-4 operation
qSet the desired frequency in an HF band.
• The AH-4 will not operate on frequencies outside of
ham bands.
wPush [TUNER] for 1 sec.
• The [TUNER] light flashes and “CW” appears while tun-
ing.
eThe [TUNER] light lights constantly when tuning is
complete.
• When the connected wire cannot be tuned, the
[TUNER] light goes out, the AH-4 is bypassed and the
antenna wire is connected to the antenna connector on
the transceiver directly.
rTo bypass the AH-4 manually, push [TUNER].
•PTT tune function
The AH-4 is always tuned when the PTT is pushed
after the frequency is changed (more than 1%). This
function removes the “push and hold [TUNER]” oper-
ation and activates first transmission on the new fre-
quency. This function is turned ON in initial set mode,
item 34 (p. 81).
CW
[TUNER]
Push [TUNER] for 1 sec.
USB
AH-4 setting example:
For mobile operation    
For outdoor operation    
Long wireOptional AH-2b
antenna element
DOptional AH-4 AUTOMATIC ANTENNA TUNERoperation
RDANGER!: HIGH VOLTAGE!
NEVERtouch the antenna element while tuning or
transmitting.
Tuning is required for each frequency. Be sureto
re-tune the antenna before transmitting when you
change the frequency—even slightly.
CONVENIENT
9 
						

							10
67
DATA COMMUNICATION
DWhen connecting to [DATA] socket
DWhen connecting to [ACC] socket
[ACC]Rear panel
4
8
12
1 2 3
76 5
9
10 11
13
Rear panel 
 
      view
Colors refer to connection
to the supplied ACC cable. *
1Connect SQL line when required.
MSEND (orenge)
GND (red)
SQL*
1 (light green)
AF in (pink)
AF out (light blue)
TU or TNC 
Personal computer
DWhen connecting to [MIC] connector
[MIC] Rear panel
➇ SQL
➂ AF out➃ PTT➄ GND➅ MIC➆ GND
Rear panel 
 
      viewTU or TNC 
Personal computer
Connections for packet
Rear panel
Personal computer DATATNC SIDE
TU or TNC RS-232C
PTT PTTP
DATA INSQL RX AUDIO
GND TX AUDIO
q we yt
r
AF OUT
DATA OUT
GNDSQ 
						

							68
10DATA COMMUNICATION
Before operating packet (AFSK) be sure to consult
the operating manual that came with your TNC.
qConnect a TNC and PC as left page.
wPush [
(Y)BAND]/[(Z)BAND] to select the desired
band.
ePush [MODE] momentarily to select SSB (LSB)
mode (or select SSB-D mode).
• After USB mode is selected, push [MODE] for 1 sec.
to toggle between USB and LSB modes.
• After RTTY mode is selected, push [MODE] for 1 sec.
to toggle between RTTY and SSB-D modes.
• Generally, LSB is used on the HF bands and FM is
used for the 50 MHz band.
rRotate [AF] to set audio to a comfortable listening
level.
tRotate the main dial to tune a desired signal.
• S-meter indicates received signal strength.
yTransmit your AFSK signals using your computer’s
keyboard.
• The TX indicator lights red.
NOTE:When connecting a TNC to the ACC socket
on the rear panel, select SSB-D mode or discon-
nect the microphone and adjust ‘MIC GAIN’ to 0 in
quick set mode.
When SSB-D mode is selected, the audio input
from the [MIC] connector is automatically cut, and
the audio input from the [ACC] is used.
RLSB
CH VFO APO
S1
5 5 379
20 40
10 60dB
USBCW RTTYAM WFM
M4  1/4 TON  AGC
[TX] indicator [MODE]Main dial[AF]
[Y]
[Z]
“USB” or “LSB” blinks when 
SSB-D mode is selected.
Packet (AFSK) operation
When operating AFSK in SSB mode, the indicated
frequency is the signals carrier point.• Example— SSB-D mode
Mark freq.: 2125 Hz
Shift freq.: 200 Hz
2325 Hz
200 Hz 2125 Hz
Carrier point
(Displayed frequency)
DFrequency indication during AFSK operation
10 
						

							69
10DATA COMMUNICATION
qPush [MODE] one or more times to select RTTY
mode.
wPush [MODE] for 1 sec. to SSB-D mode.
• After RTTY mode is selected, push [MODE] for 1 sec.
to toggle between RTTY and SSB-D modes.
NOTE:When SSB-D mode is selected, the audio
input from the [MIC] connector is automatically cut,
and the audio input from the [ACC] is used.
OPERATING MODE SELECTION
MODE
Push
momentarily Memory keyer
set mode
MODE
Push
for 1 sec. USB LSB
FM AM
SSB-D
CW
RTTY
[MODE]
qSelect SSB-D mode with [MODE].
wPush [DISPLAY] for 1 sec. to enter quick set mode.
ePush [MENU] one or more times to select “Q2
CAR  SIDE,” then rotate the main dial to select
“U” (USB mode) or “L” (LSB mode).[MODE]
Main dial [DISPLAY] [MENU]
DSSB-D mode selection
DCarrier point setting
QUICK SET MODE 
						

							70
10DATA COMMUNICATION
DAdjusting the transmit signal from the TNC
NOTE:For packet operation the transceiver can be
set to one of two data speeds: 1200 bps or 9600
bps. Data speed is set in initial set mode (item “36
9600 MODE”; see p.81).
qPush [POWER] for 1 sec. to turn power OFF.
wWhile pushing [LOCK], push [POWER] to turn
power ON.
• Initial set mode is selected and one of its items ap-
pears.
ePush [MENU] one or more times to select the item
“36 9600 MODE.”
• [M-CH] or [Y]/[Z] can also be used.
rRotate the main dial to select the data speeds:
1200 bps or 9600 bps.
tTo exit initial set mode, push [POWER] for 1 sec.
to turn power OFF.
yPush [POWER] to turn power ON again.
• The conditions selected in initial set mode are now ef-
fective.
When setting data transmission speed to 9600 bps,
the 
DATAsignal coming from the TNC is applied ex-
clusively to the internal limiter circuitry to automati-
cally maintain bandwidth.
NEVER apply data levels from the TNC of over 0.6
Vp-p, otherwise the transceiver will not be able to
maintain the band width and may possibly interfere
with other stations.
NOTE:Read the instructions supplied with your
TNC carefully before attempting packet operation
with the IC-703.1. When using a level meter or synchroscope, adjust
the TX audio level (
DATA INlevel) from the TNC as
follows.
0.4 Vp-p (0.2 Vrms): recommended level
0.2 Vp-p–0.5 Vp-p (0.1 Vrms–0.25 Vrms):
acceptable level
2. When not using a measuring device.
qConnect the IC-703 to a TNC.
wEnter a test mode (“CAL”, etc.) on the TNC, then
transmit some test data.
eWhen the transceiver fails to transmit test data or
transmits sporadically (TX indicator doesn’t appear
or flashes):
Decrease the TNC output level until the transmit
indicator lights continuously.
When transmission is not successful even though
the TX indicator lights continuously:
Increase the TNC output level.
Main dial [LOCK] [MENU]
[MODE]Main dial[POWER]
[Y]
[Z]
10 
						

							11
71
CONTROL COMMAND
CONTROLLER TO IC-703
FE FE 68 E0 Cn Sc Data area FD
Preamble code (fixed)
Transceiver’s default address
Controller’s default address
Command number
(see table at right)
Sub command number
(see table at right)
BCD code data for frequency or
memory number entry
End of message code (fixed)
OK MESSAGE TO CONTROLLER
FE FE 68 E0 FB FD
Preamble code (fixed)
Transceiver’s default address
Controller’s default address
OK code (fixed)
End of message code (fixed)
NG MESSAGE TO CONTROLLER
FE FE 68 E0 FA FD
Preamble code (fixed)
Transceiver’s default address
Controller’s default address
NG code (fixed)
End of message code (fixed)
IC-703 TO CONTROLLER 
FE FE E0 68 Cn Sc Data area FD
Preamble code (fixed)
Controller’s default address
Transceiver’s default address
Command number
(see table at right)
Sub command number
(see table at right)
BCD code data for frequency or
memory number entry
End of message code (fixed)
DCI-V connection example
The transceiver can be connected through an optional
CT-17 
CI-V LEVEL CONVERTERto a personal computer
equipped with an RS-232C port. The Icom Communi-
cation interface-V (CI-V) controls the following func-
tions of the transceiver.
Up to four Icom CI-V transceivers or receivers can be
connected to a personal computer equipped with an
RS-232C port. See p. 82 for setting the CI-V condition
using initial set mode.
DData format
The CI-V system can be operated using the following
data formats. Data formats differ according to com-
mand numbers. A data area is added for some com-
mands.
Personal
computer
IC-703
9–15 V DC
Remote jack (CI-V) information 
						

							72
11CONTROL COMMAND
DCommand table
Command Sub command Description
00 — Send frequency data
01 Same as  Send mode data
command 06
02 — Read band edge frequencies
03 — Read operating frequency
04 — Read operating mode
05 — Set operating frequency 
06 00 Select LSB
01 Select USB
02 Select AM
03 Select CW
04 Select RTTY
05 Select FM
07 Select CW-R
08 Select RTTY-R
07 — Select VFO mode
00 Select VFO A
01 Select VFO B
A0 Equalize VFO A and VFO B
B0 Exchange VFO A and VFO B
08 — Select memory mode
0001–0105* Select memory channel
*1A=0100, 3b=0105
09 — Memory write
0A — Memory to VFO
0B — Memory clear
0E 00 Scan stop
01 Programmed/memory scan start
0F 00 Turn the split function OFF
01 Turn the split function ON
10 00 Select 10 Hz (1 Hz) tuning step
01 Select 100 Hz tuning step
02 Select 1 kHz tuning step
03 Select 5 kHz tuning step
04 Select 9 kHz tuning step
05 Select 10 kHz tuning step
06 Select 12.5 kHz tuning step
07 Select 20 kHz tuning step
08 Select 25 kHz tuning step
09 Select 100 kHz tuning step
11 — Select/read attenuator (00=OFF,
20=ON (20 dB))
13 00 Announce with voice synthesizer
01 (00=all data; 01=frequency and 
02 S-meter level; 02=operating mode)
14 01 + Level data [AF] level setting (0=max. CCW to
255=max. CW)
02 + Level data [RF] level setting (0=max. CCW to
255=11 o’clock)
03 + Level data [SQL] level setting (0=11 o’clock to
255=max. CW)
04 + Level data [IF SHIFT] position setting (0=max.
CCW; 128=center; 255=max. CW)
06 + Level data Noise reduction level setting
(0=min. to 255=max.)
07 + Level data Twin PBT (inside) setting (0=max.
CCW, 128=center, 255=max. CW)
08 + Level data Twin PBT (outside ) setting
(0=max. CCW, 128=center,
255=max. CW)
09 + Level data CW pitch setting (0=300 Hz,
128=600 Hz, 255=900 Hz)Command Sub command Description
14 0A + Level data RF power setting (0=mini. to
255=max.)
0B + Level data Microphone gain setting (0=mini.
to 255=max.)
0C + Level data Key speed setting (0=slow to
255=fast)
0E + Level data
COMP Level setting (0=0 to 10=10)
0F + Level data Break-IN DELAY setting (20=2.0d
to 130=13.0d)
15 01 Read squelch condition
02 Read S-meter level
11 Read RF power meter 
12 Read  SWR meter 
13 Read ALC  meter 
16 02 Preamp (0=OFF; 1=preamp 1;
2=preamp 2)
12 AGC selection (1=Fast; 2=Slow)
22 Noise blanker (0=OFF; 1=ON)
40 Noise reduction (0=OFF; 1=ON)
41 Auto notch (0=OFF; 1=ON)
42 Subaudible tone (0=OFF; 1=ON)
43 Tone squelch (0=OFF; 1=ON)
44
Speech compressor (0=OFF; 1=ON)
45 Monitor (0=OFF; 1=ON)
46 VOX function (0=OFF; 1=ON)
47 Break-in (0=OFF; 1=semi break-
in; 2=full break-in)
19 00 Read the transceiver ID
1A 00 Send/read memory contents
01 Send/read band stacking register
contents (see p. 73 for details)
02 Send/read memory keyer con-
tents (see p. 73 for details)
0301 Send/read beep emission set
(0=OFF, 1=ON)
0302 Send/read band edge beep set
(0=OFF, 1=ON)
0303 Send/read beep output level set
(0=min. to 255=max.)
0304 Send/read beep limit set (0=OFF,
1=ON)
0305 Send/read CW carrier point set
(0=LSB, 1=USB)
0306 Send/read CW side tone level set
(0=min. to 255=max.)
0307 Send/read CW side tone limit set
(0=OFF, 1=ON)
0308 Send/read 9600 bps mode set
(0=OFF, 1=ON)
0309 Send/read VOX gain set (0=min.
to 255=max.)
0310Send/read anti VOX gain set
(0=min. to 255=max.)
0311 Send/read VOX delay time set
(0=0 sec. to 20=2.0 sec.)
0312 Send/read meter selection
(0=Power, 1=SWR, 3=ALC)
0313 Send/read SSB carrier frequency
(00=–200 Hz to  40=200 Hz;
10 Hz steps)
CW: Clockwise, CCW: Counter Clockwise
11 
						

							73
11CONTROL COMMAND
Command table (continued)
D D
Band stacking register
To send or read the desired band stacking register ’s con-
tents, combined code of the frequency band and register
codes as follows are used. 
For example, when sending/reading the contents in the
21 MHz band, the code “0701” is used.
•Frequency band code •Register code 
D
D
Codes for memory keyer contents
To send or read the desired memory keyer contents, the
channel and character codes as follows are used. 
•Channel code 
•Character’s code 
D
D
Codes for memory name contents
To send or read the desired memory name settings, the
character codes, instructed codes for memory keyer con-
tents as above, and follows are additionally used. 
•Character’s code— Alphabetical characters
•Character’s code— Symbols 
Command Sub command Description
1A 0314 Send/read RTTY marker fre-
quency (0=1275 Hz, 1=1615 Hz,
2=2125 Hz)
0315 Send/read RTTY shift width
(0=170 Hz, 1=200 Hz, 2=425 Hz)
0316 Send/read RTTY keying polarity
(0=Normal, 1=Reverse)
0317 Send/read noise blanker level
(0=min. to 255=max.)
0318 Send/read key type (0=Normal,
1=Reverse, 2=Bug, 3=OFF,
4=Mic. [UP]/[DN])
0319 Send/read CW keyer dot/dash
ratio (28=1:1:2.8 to 45=1:1:4.5)
0320 Send/read CW keyer repeat time
(01=1 sec. to 60=60 sec.)
0321 Send/read CW keyer transmission
indication (0=Normal, 1=First 3-
character, 2= First 3-character+
contact number)
0322 Send/read contact number style 
(0=Normal, 1=190→ANO,
2=190→ANT, 3=90→NO,
4=90→NT)
0323 Send/read count up trigger chan-
nel (1=MK1, 2=MK2, 3=MK3)
0324
Send/read present number (1–999)
04 Send/read DATA mode (0=OFF,
1=ON)
1B 00 Set/read repeater tone frequency
01 Set/read TSQL tone frequency
1C 00 Set/read the transceiver’s condi-
tion (0=Rx; 1=Tx)
01 Set/read antenna tuner condition 
(0=OFF, 1=ON, 2=Start tuning or
while tuning)
Character ASCII code Character ASCII code
a–z 61–7A — —
Code Freq. band Frequency range (unit: MHz)
01 1.8 1.800000–1.999999
02 3.5 3.400000–4.099999
03 7 6.900000–7.499999
04 10 9.900000–10.499999
05 14 13.900000–14.499999
06 18 17.900000–18.499999
07 21 20.900000–21.499999
08 24 24.400000–25.099999
09 28 28.000000–29.999999
10 50 50.000000–54.000000
11 GENE Other than above
Character ASCII codeDescription
0–9 30–39 Numerals
A–Z 41–5A Alphabetical characters
space 20 Word space 
/ 2F Symbol
? 3F Symbol
, 2C Symbol
. 2E Symbol
^ 5E e.g., to send 
BT, enter ^4254
✱2A Inserts contact number (can be
used for 1 channel only)
Code Channel number
01 MK1
02 MK2
03 MK3
Character ASCII code Character ASCII code
!21#23
$24%25
&26 ¥5C
?3F ” 22
’27`60
+2B–2D
:3A;3B
=3D3E ( 28
)29[5B
]5D{7B
}7D|7C
_5F–
7E
Code Registered number
01 1  
						

							12
74
SET MODE
General
Set mode is used for programming infrequently
changed values or conditions of functions. The IC-703
has 2 separate set modes: quick set mode and initial
set mode.
qWhile power is ON, push [DISPLAY] for 1 sec.
• Quick set mode is selected and one of its items ap-
pears.
• Quick set mode items vary depending on the selected
operating mode (SSB, FM, etc.).
wPush [MENU] one or more times to select the de-
sired item.
• [M-CH] or [Y]/[Z] can also be used.
eRotate the main dial to set the values or conditions
for the selected item.
rRepeat steps wand eto set other items.
tTo exit quick set mode, push [DISPLAY] momen-
tarily.[MENU][DISPLAY][M-CH]
[POWER]Main dial
[Y]
[Z]
Q1 RF POWER
USB
Item numberItem Value or 
condition
[DISPLAY EXAMPLE: QUICK SET MODE]
PO
S1
5 5 3792040
10 60dB
DQuick set mode operation
qPush [POWER] for 1 sec. to turn power OFF.
wWhile pushing [LOCK], push [POWER] to turn
power ON.
• Initial set mode is selected and one of its items ap-
pears.
ePush [MENU] one or more times to select the de-
sired item.
• [M-CH] or [Y]/[Z] can also be used.
rRotate the main dial to set the values or conditions
for the selected item.
tRepeat steps eand rto set other items.
yTo exit initial set mode, push [POWER] for 1 sec.
to turn power OFF.
uPush [POWER] to turn power ON again.
• The conditions selected in initial set mode are now ef-
fective.
[MENU][LOCK][M-CH]
[POWER]Main dial
[Y]
[Z]
Item numberItem Value or 
condition
 1MAX POWSET
[DISPLAY EXAMPLE: INITIAL SET MODE]
DInitial set mode operation
11
12 
						

							Quick set mode items
Q1 RF POWER (all modes)
This item adjusts the RF output power. The RF out-
put power can be adjusted from L, 1 to 9 and H for in-
dication, however, it can be adjusted continuously.
The default is H (maximum power).Note that while adjusting the output
power, the power meter is displayed
automatically.
Q2 MIC GAIN (SSB/AM/FM modes)
This item adjusts microphone gain from 1 to 10 for in-
dication, however, it can be adjusted continuously.
The default is 5. Note that while adjusting mic gain, the
ALC meter is displayed automatically.
Q2 KEY SPEED (CW mode)
This item adjusts the CW key speed. The key speed
can be selected from 6 to 60 wpm.
The default is 20 wpm.CW
Q2 RTTY REV (RTTY mode) 
This item selects RTTY or åRTTY (RTTY reverse)
mode.
The default is normal.RTTY
Q3 CW REV (CW mode) 
This item selects CW or CWå(CW reverse) mode.
The default is normal.CW
Q3 CARRIER Frq (SSB mode)
This item adjusts the carrier frequency (BFO fre-
quency), allowing you to change the audio character-
istics. Selectable values are –200 to +200 Hz in 10 Hz
steps.USBThe default is 0 Hz.
Q2  CAR  SIDE (SSB-D mode)
This item selects the carrier point. USB mode or LSB
mode are selectable.
The default is LSB mode.
LSB
75
12SET MODE
Mode Set mode item Default setting
Q1 RF POWERH
SSBQ2 MIC GAIN5 level
Q3 CARRIER Frq0 [Hz]
Q1 RF POWERH
CWQ2 KEY SPEED20 [WPM]
Q3 CW REVn (normal)Mode Set mode item Default setting
RTTYQ1 RF POWERH
Q2 RTTY REVn (normal)
SSB-DQ1 RF POWERH
Q2 CAR SIDEL (LSB side)
FM/AMQ1 RF POWERH
Q2 MIC GAIN5 level