1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan
A-6313H-1EX-
q
Printed in Japan
© 2003 Icom Inc.
■
Assembling the antenna
q
Attach the top element to the base element, then
tighten the top element.
w
Tighten the set screw.
e
Attach the grounding wires to the [GND] terminal of
the IC-703 rear panel as illustrated below.
• Keep the grounding wires in the LC-156 side pockets via
the cable hole.
• Keep the separation cable on the outside of the LC-156.
The above illustration is example only
When SWR cannot be reduced, abnormal function-
ing of the transceiver may occur, etc., change the
cables
(grounding, separation, DC power and micro-
phone cables)
wiring, as described in the “
■
Opera-
tion hints”.
■
Adjusting the antenna
q
Set the desired operating frequency on the IC-703.
w
Connect the short element between the short termi-
nals to suits the set operating frequency as follows.
e
Push [TUNER] on the IC-703 controller, then mea-
sure the VSWR.
• See the IC-703 instruction manual for the VSWR mea-
surement procedure.
r
When the VSWR is not good enough
(VSWR>1.5:1)
or not tuned, adjust the following.
• Top element length:
Loosen the nut of the top element, then adjust
the element length as illustrated below.
• To improve VSWR on a higher or lower frequency in
the selected frequency band, adjust the top element
by lengthening or shortening it, respectively.
• After the element length adjustment, tighten the nut.
• Grounding wires:
Adjust or change the wires angle, holding posi-
tion, etc.
t
Repeat the steps
e
and
r
until the VSWR be-
comes better than 1.5:1.
■
Operation hints
K
The IC-703 separation cable may work as the
grounding cable (counterpoise).
Changing the cable wiring may also provide better
VSWR.
K
The quality of communication during portable oper-
ation depends on the operating frequency, field con-
dition, etc.
When the operating condition is not good, changing
the place of operation may help improve operating
performance.
K
When changing the operating frequency, manual
tuning is helpful for good operation. Even changing
the frequency 10 kHz, you should start with manual
tuning.
Loosen
Adjustable
Tighten
;
;
;
;
;
;
;
IC-703
Separation cable
controller case
AH-703
Pass the grounding wire
through the cable hole and
keep in the side pocket.
Loosen
Set screw
Tighten
Freq.
Short element
Using loading coil
Band
connection
7 MHz
Remove the element All loading coils (A–D)
14 MHz
D–E
A–C
21 MHz
C–E
A–B
28 MHz
B–E
A only
50 MHz
A–E
No loading coil
AH-703.qxd 03.10.2 18:02 Page 2
