Icom AT-140 Instruction Manual
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Icom AT-140 Instruction Manual

Hf automatic antenna tuner
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INSTRUCTION MANUAL
HF AUTOMATIC
ANTENNA TUNER
AT-140

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Summary of Contents for Icom AT-140

  • Page 1 INSTRUCTION MANUAL HF AUTOMATIC ANTENNA TUNER AT-140...

  • Page 2: Foreword

    * The supplied pin connector and connector pins may differ, depending on the version. Icom, Icom Inc. and the Icom logo are registered trademarks of Icom Incorporated (Japan) in Japan, the United States, the Unit- ed Kingdom, Germany, France, Spain, Russia and/or other countries.

  • Page 3: Table Of Contents

    ………………………………… 10 ■ Super capacitor for memory backup 6 INSTALLATION EXAMPLE …………………11–12 Even if the AT-140 is not used for approximately 1 week, the built-in super capacitor backs up the con- tents of the 45 memories. Low power tune up The AT-140 emits low output power during tuning.

  • Page 4: System Installation

    HF system, the operator can close to the base of your antenna as possible. expect top performance. * The AT-140 is housed in a durable, completely weather resistant case. You don’t have to worry a lot about rain, splash, and so on.

  • Page 5: Antenna And Tuners

    ANTENNA SYSTEM Antenna and tuners ■ If your Icom HF system is going aboard a sailboat, Insulator you may use an insulated backstay to make up your antenna system. Your best range will be from an in- sulated backstay because of the long length of the...

  • Page 6: Antenna System

    In some countries, HF transceivers can be used for Refer to the AH-2b instruction manual for the AH-2b land mobile operation. Ask your Icom Dealer for de- and AT-140 installation to your vehicle. Ask your tails, since the radio law varies according to each Icom Dealer for details.

  • Page 7: Coaxial Cable

    ANTENNA SYSTEM Coaxial cable ■ Insulate the lead-in cable of the AT-140 antenna termi- To prevent erroneous indications, keep cables as far nal and antenna element from other metal objects. away as possible from the flux gate compass. To prevent interference, keep cables as far as pos-...

  • Page 8: Installations

    • Refer to “Control cable” as described below. • Refer to page 7, “Cable connections.” w Connect and solder the PL-259 connector to the t Connect the AT-140’s ground terminal to the ship’s coaxial cable. ground or counterpoise. Refer to page 6, “PL-259 connector.”...

  • Page 9: Pl-259 Connector

    * The electrical tape is not supplied with the AT-140. • Make sure the base nut is tightened firmly, before you tighten the wing nut. (See the Fig.1 to the right.) Fig.2...

  • Page 10: Mounting

    Otherwise, vibrations and tape to secure waterproofing. shocks due to waves could loosen the antenna * The electrical tape is not supplied with the AT-140. tuner making if fall, causing personal injury. Mounting on a flat surface...

  • Page 11: Control Cable Signals

    Less than 1 V to start tuning Time *For the Tuner Through function; Less than 250 milliseconds Key voltage [KEY] During automatic tuning, the AT-140 grounds the key voltage line, and the HF transceiver reduces output power. During automatic tuning Approximately 7.5 V...

  • Page 12: Transceiver Setting

    CONTROL CABLE SIGNALS Transceiver setting ■ IC-M700 with serial number 2500 and below IC-78 In the IC-M700, change the [TUNE] switch setting In the IC-78, select the antenna tuner type as “AH-4*” from the “1” position to the “2” position. Confirm that in initial set mode.

  • Page 13: Unit Description And Specifications

    UNIT DESCRIPTION AND SPECIFICATIONS Unit description ■ 80 mm; 3.1 inches Ground terminal Mounting plate Antenna connector Control cable connector Antenna terminal Mounting plate 91.5 mm; 3.6 inches Specifications ■ • Frequency coverage: 1.6–30 MHz (with 7 m; 23.0 feet) or longer antenna element) •...

  • Page 14: Installation Example

    INSTALLATION EXAMPLE • Descriptions The following are antenna tuner and antenna installa- tion examples for a non-sail boat. Horizontal element They also explain both transmission and reception performance, for your reference. Vertical Antenna element tuner RDANGER: HIGH VOLTAGE! NEVER touch the antenna element while tuning or transmitting.

  • Page 15: Installation Example

    INSTALLATION EXAMPLE Antenna tuner location versus the strength of radiation from the same length of the antenna element When the antenna tuner is installed on the deck with the same element length connected. Good — Horizontal Better — Inverted-L Best — Vertical The antenna tuner is installed at a The element is bent in the middle as an If the length of the antenna element is...
  • Page 16 A-6175H-1EX-t Printed in Japan © 2002–2013 Icom Inc. 1-1-32 Kamiminami, Hirano-ku, Osaka 547-0003, Japan Printed on recycled paper with soy ink.

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