Icom AH-703 User manual

INSTRUCTIONS
HF/50 MHz 5-BAND ANTENNA
AH-703
Thank you for purchasing the AH-703
HF /50 MH z5-
BAND ANTENNA
. This antenna covers 7, 14, 21, 28
and 50 MHz bands, and is designed for portable
operation of the IC-703 when carried in the LC-156.
Please read these instructions thoroughly before
using the AH-703.
■IMPORTANT
READ ALL INSTRUCTIONS carefully and completely
before using the AH-703.
SAVE THIS INSTRUCTION SHEET!— This instruction
contains important safety and operating details for the
AH-703.
■PRECAUTION
RWARNING: HIGH VOLTAGE!
NEVER touch the antenna element/wire while tuning
or transmitting. This may result electrical shock or burn.
RWARNING SUSPEND operation immediately or
NEVER put up the antenna when thunder occurs or
can be heard in the distance.
RWARNING NEVER assemble or disassemble the
antenna at any crowded area. A person may be in-
jured.
USE the AH-703 for portable operation with the IC-703
ONLY. NEVER install the antenna to a vehicle for mo-
bile operation.
DISCONNECT the antenna when not using the an-
tenna for long period of time.
DO NOT use chemical agents such as benzine or alco-
hol when cleaning, as they can damage the AH-703.
READ THE IC-703 INSTRUCTION MANUAL FIRST
before attempting to operate the transceiver.
■Supplied items
■Antenna description
■Antenna specifications
• Frequency coverage : 7, 14, 21, 28 and 50 MHz bands
• Type of antenna : 1⁄4λtype whip antenna
• Antenna connector : PL-259 (50 Ω: nominal)
• Max. input power : 20 W
• Total antenna length : Approx. 1,390 mm; 4.6 ft
(at the longest element length)
• Weight : Approx. 330 g; 11.6 oz
(without grounding wires)
All stated specifications are subject to change without notice or
obligation.
Top element
Short terminal A
Short element
Loading coil A
Short terminal B
Loading coil B
Short terminal C
Loading coil C
Short terminal D
Loading coil D
Short terminal E
Base element
Antenna connector
(PL-259 type)
Base
element
Top element Allen wrench
Grounding wires
Set screw
Icom, Icom Inc. and the logo are registered trademarks of
Icom Incorporated (Japan) in the United States, the United King-
dom, Germany, France, Spain, Russia and/or other countries.
AH-703.qxd 03.10.2 18:02 Page 1

1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan A-6313H-1EX-qPrinted in Japan
© 2003 Icom Inc.
■Assembling the antenna
qAttach the top element to the base element, then
tighten the top element.
wTighten the set screw.
eAttach 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
qSet the desired operating frequency on the IC-703.
wConnect the short element between the short termi-
nals to suits the set operating frequency as follows.
ePush [TUNER] on the IC-703 controller, then mea-
sure the VSWR.
•See the IC-703 instruction manual for the VSWR mea-
surement procedure.
rWhen 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.
tRepeat the steps eand runtil the VSWR be-
comes better than 1.5:1.
■Operation hints
KThe IC-703 separation cable may work as the
grounding cable (counterpoise).
Changing the cable wiring may also provide better
VSWR.
KThe 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.
KWhen 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–EA–C
21 MHz C–EA–B
28 MHz B–E A only
50 MHz A–E No loading coil
AH-703.qxd 03.10.2 18:02 Page 2

This file has been downloaded from:
www.UsersManualGuide.com
User Manual and User Guide for many equipments like mobile phones, photo cameras, monther board, monitors, software, tv, dvd, and othes..
Manual users, user manuals, user guide manual, owners manual, instruction manual, manual owner, manual owner's, manual guide,
manual operation, operating manual, user's manual, operating instructions, manual operators, manual operator, manual product,
documentation manual, user maintenance, brochure, user reference, pdf manual