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...

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...

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...

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]....

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....

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...

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*...

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...

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...

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...