User manual ICOM AT-140

[. . . ] INSTRUCTION MANUAL HF AUTOMATIC ANTENNA TUNER AT-140 FOREWORD AT-140 HF AUTOMATIC ANTENNA TUNER. Thank you for purchasing the 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. PRECAUTIONS R DANGER HIGH VOLTAGE!NEVER touch the antenna terminal, ground terminal, antenna or counterpoise while transmitting. [. . . ] 3­5 I lnstallation outline. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 I Control cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 I PL-259 connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 I Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 I Cable connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 CONTROL CABLE SIGNALS . . . . . . . . . . . . . . . . . . . . . 6­7 I Terminal information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 I Transceiver setting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 4 UNIT DESCRIPTION AND SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 I Unit description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 I Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 ii 1 ANTENNA SYSTEM I Antenna for ship Required antenna element length Required antenna element length to achieve full performance varies according to the lowest frequency: The lowest frequency Required antenna element length 1. 6 MHz band 4 MHz band 7 m; 23. 0 feet or longer 3 m; 9. 8 feet or longer Backstay operates as a long-wire antenna. Insulator The longer the antenna element, the better the antenna efficiency. Undesirable antenna element lengths AVOID multiples of 1/2 (half wavelength) for antenna 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, . . . ) L= 300 1 × ×n 2 f Insulator Whip antenna [Example] At an operating frequency of 16 MHz, avoid the following antenna element lengths: L= 1m 300 1 × ×n 2 16 39 inches 9. 4, 18. 8, . . . For example, if 15 m is selected for an antenna element length, you have no problem in the 1. 6­25 MHz marine bands range. NOTE: Keep antennas as far away from other objects as possible, especially metal objects. I 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. Connect a suitable antenna element for a base station. To achieve full performance, refer to "Required antenna element length" above. AH-2b 1 ANTENNA SYSTEM 1 I Coaxial cable Insulate the lead-in cable of the AT-140 antenna terminal and antenna element from other metal objects. To prevent interference, keep cables as far as possible from an antenna, electric pump and other electronic equipment. To prevent erroneous indications, keep cables as far away as possible from the flux gate compass. Use suitable noise filters for alternators, fluorescent lights, etc. [. . . ] current drain 1 mA Ground terminal for above signals. 3 Start voltage [STAR] When a start voltage (less than 1 V) is received, the AT-140 begins automatic tuning. More than 350 msec. * Start voltage 8 [V] 6 4 2 0 Time *For tuner through operation; Less than 250 msec. 7. 5 V Key voltage [KEY] During automatic tuning, the AT-140 grounds the key voltage line, and the HF transceiver reduces output power. During automatic tuning Key voltage 8 [V] 6 Approx. 7. 5 V [KEY] [STAR] [13. 6] [E] *Connector shape may differ according to version. 4 2 0 Grounded Time If the key voltage is more than 8 V, switch the mode switch (S1) to OFF mode (lower position). S1 NORMAL mode OFF mode [E] [13. 6] [STAR] [KEY] Mode switch (S1) 6 3 CONTROL CABLE SIGNALS I Transceiver setting IC-M700 with serial number 2500 and below In the IC-M700, change the [TUNE] switch setting from the "1" position to the "2" position. Confirm that the [KEY] switch is in the "2" position. [. . . ]