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[. . . ] q U-bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 w U-bolt plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 e Flat washers (M6 large) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 r Flat washers (M6 small) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] ii 1 ANTENNA SYSTEM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 I Antenna for ship . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 I Coaxial cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 I Ground and counterpoise . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 2 INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 I Installation outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 I Control cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 I PL-259 connector. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 I Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 I Cable connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 CONTROL CABLE SIGNALS . . . . . . . . . . . . . . . . . . . . . . . . 6 I Terminal information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 4 UNIT DESCRIPTION AND SPECIFICATIONS . . . 7 I Unit description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 I Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
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.
1
ANTENNA SYSTEM
1
I Coaxial cable
Insulate the lead-in cable of the AT-141 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. Ask your Dealer for details.
I Ground and counterpoise
Why a ship's ground is required The AT-141's ground terminal MUST be connected
to your ship's ground. Grounding prevents electric shocks, interference to other equipment and other problems. [. . . ] r Connect the coaxial cable and the control cable to the transceiver as illustrated below. t Ground the transceiver, AT-141 and shield cable of the control cable via the ground terminal.
· See p. (re-tuning for a memorized frequency) : SWR 2. 0:1 (after tuning, except for multiples of 1/2 )
All stated specifications are subject to change without notice or obligation.
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Icom America Inc.
<Corporate Headquarters> 2380 116th Avenue N. E. , Bellevue, WA 98004, U. S. A. Phone: +1 (425) 454-8155 Fax: +1 (425) 454-1509 URL: http//www. icomamerica. com E-mail: sales@icomamerica. com <Customer service> Phone: (425) 454-7619
Icom (Europe) GmbH
Communication Equipment Himmelgeister Str. [. . . ]
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