Icom AT-140 User Manual
HF AUTOMA TIC
ANTENNATUNER
AT-140
INSTRUCTION MANUAL
i
FOREWORD
Thank you for purchasing the AT-140 HF AUTO-
MA TIC ANTENNA TUNER
.
The AT-140 is designed, primarily for use with Icom HF
transceivers.
Refer to your HF transceiver instruction manual for operation. If you have any questions, contact your dealer.
IMPORTANT
READ ALL INSTRUCTIONS carefully and com-
pletely before using the AT-140.
SAVE THIS INSTRUCTION MANUAL. This in-
struction manual contains important safety and installation instructions.
EXPLICIT DEFINITIONS
PRECAUTIONS
R DANGER HIGH VOLTAGE! NEVER touch
the antenna terminal, ground terminal, antenna or
counterpoise while transmitting. Place the AT-140, antenna and counterpoise in positions where no one can
touch them.
NEVER use without a ground connection.
NEVER transmit during internal adjustment. This may
cause an electric shock.
USE the ground terminal for ground connection.
The mounting plate is not connected internally.
DO NOT operate your HF marine transceiver without
running the boat’s engine.
AVOID using the AT-140 in areas where the temper-
ature is below –30°C (–22°F) or above +60°C
(+140°F).
Ground terminal
Mounting plate
Word Definition
R WARNING
Personal injury, fire hazard or electric
shock may occur.
CAUTION Equipment damage may occur.
NOTE
If disregarded, inconvenience only. No
personal injury, fire hazard or electric
shock.
SUPPLIED ACCESSORIES
The following accessories are supplied with the AT-140.
Qty.
q U-bolts ………………………………………………2
w U-bolt plates …………………………………………2
e Flat washers (M6 large) ……………………………8
r Flat washers (M6 small) ……………………………4
t Spring washers (M6) ………………………………8
y Nuts (M6) ……………………………………………8
u Hex head bolts (M6×50) ……………………………4
i Self-tapping screws (A0 6×30) ……………………4
o Weatherproof cap……………………………………1
!0 6-pin connector………………………………………1
!1 Connector pins ………………………………………4
!2 Ground cable (OPC-412) …………………………1
q
w
e
r
t
y
u
i
o
!0
!1
!2
Icom, Icom Inc. and the are registered trademarks of
Icom Incorporated (Japan) in the United States, the United
Kingdom, Germany, France, Spain, Russia and/or other
countries.
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MISCELLANEOUS ITEMS
The following parts are additionally required for installation, but are not supplied with the AT-140.
Purchase these parts locally.
q AWG 14×4-conductor shielded cable
*Icom offers an optional OPC-1147
CONTROL CABLE
.
Length: 10 m; 32.8 feet
w 50 Ω coaxial cable
e PL-259 connectors
FEATURES
Matches all bands
The AT-140 matches any frequency on every HF marine band. For example, the tuner matches a 7 m; 23 ft
long-wire antenna across 1.6–30 MHz.
Full automatic tuning
Just push the [TUNE] switch on the transceiver, and
the AT-140 adjusts immediately to the minimum SWR
of any frequency on any HF marine band.
HF operation on any size ship
The AT-140 allows you HF operation where antenna
element length is restricted due to space.
Weather resistant
The AT-140 is housed in a durable, completely weather
resistant ASAcase with a rubber gasket. The antenna
tuner can be conveniently installed both on the deck or
in the cabin near the antenna element.
Simple installation
Installation is simple. Just connect the control and antenna cables. You never need to open the cover.
45 memories for shorter tuning time
To decrease the tune-up time, the AT -140automatically
stores the matching conditions for up to 45 frequencies.
Re-tuning for a memorized frequency takes approx. 1
sec.
Super capacitor for memory backup
Even if the AT-140 is not used for approx. 1 week, the
built-in super capacitor backs up contents of the 45
memories.
Low power tune up
The AT-140 emits low output power during tuning. This
feature reduces the possibility of causing interference
to other stations.
Tuner through function
The tuner through function is built into the AT-140. This
function helps improve receiver gain, depending on the
antenna element length used, and operating frequency.
TABLE OF CONTENTS
FOREWORD …………………………………………… i
IMPORTANT …………………………………………… i
EXPLICIT DEFINITIONS……………………………… i
PRECAUTIONS ……………………………………… i
SUPPLIED ACCESSORIES ………………………… i
MISCELLANEOUS ITEMS ………………………… ii
FEATURES …………………………………………… ii
TABLE OF CONTENTS ……………………………… ii
1 ANTENNA SYSTEM …………………………… 1–2
■ Antenna for ship ………………………………… 1
■ Antenna for land operation……………………… 1
■ Coaxial cable …………………………………… 2
■ Ground and counterpoise ……………………… 2
2 INSTALLATIONS………………………………… 3–5
■ lnstallation outline………………………………… 3
■ Control cable……………………………………… 3
■ PL-259 connector………………………………… 4
■ Mounting ………………………………………… 4
■ Cable connections ……………………………… 5
3 CONTROL CABLE SIGNALS ………………… 6–7
■ Terminal information …………………………… 6
■ Transceiver setting ……………………………… 7
4 UNIT DESCRIPTION AND SPECIFICATIONS
………………………………………………………… 8
■ Unit description…………………………………… 8
■ Specifications …………………………………… 8
1
1
ANTENNA SYSTEM
■ Antenna for ship
Required antenna element length
Required antenna element length to achieve full performance varies according to the lowest frequency:
The longer the antenna element, the better the antenna efficiency.
Undesirable antenna element lengths
AVOID
multiples of 1⁄2λ (half wavelength) for an-
tenna element lengths, since tuning becomes difficult.
L : Antenna element length to be avoided [m]
f : Operating frequency [MHz]
n : Natural number (n = 1, 2, 3, ...)
[Example]
At an operating frequency of 16 MHz, avoid the following antenna element lengths:
For example, if 15 m is selected for an antenna element length, you have no problem in the 1.6–25 MHz
marine bands range.
NOTE: Keep antennas as far away from other objects
as possible, especially metal objects.
Insulator
Backstay operates as
a long-wire antenna.
Insulator
Whip antenna
L =
300
16
×
1
2
n
×
9.4, 18.8, ...
1 m
39 inches
L =
300
f
×
1
2
n
×
The lowest frequency Required antenna element length
1.6 MHz band 7 m; 23.0 feet or longer
4 MHz band 3 m; 9.8 feet or longer
■ Antenna for land operation
In some countries, HF transceivers can be used for
land mobile operation. Ask your Icom Dealer for details, since the radio law varies according to each
country.
For land mobile operation on 4 MHz and above, an
optional AH-2b ANTENNA ELEMENT is available.
The AH-2b includes a sturdy tow hook mount system
for holding a 2.5 m; 8.2 feet stainless steel antenna
element plus all the necessary hardware.
Refer to the AH-2b instruction manual for the AH-2b
and AT-140 installation to your vehicle. Ask your Icom
Dealer for details.
Connect a suitable antenna element for a base station. To achieve full performance, refer to “Required
antenna element length” above.
AH-2b
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