User manual ICOM AT-141
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Manual abstract: user guide ICOM AT-141
Detailed instructions for use are in the User's Guide.
[. . . ] Length: 10 m; 32. 8 feet
TABLE OF CONTENTS
FOREWORD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ii
w 50 coaxial cable e PL-259 connectors
Matches all bands The AT-141 matches any frequency on every HF marine band. [. . . ] Grounding prevents electric shocks, interference to other equipment and other problems. Grounding also ensures effective signal transmission.
If your ship is made of FRP, etc. and a good ship's ground is not available, connect a counterpoise.
radial for each band Ground terminal
DANGER!These connections may cause an explosion or electric shocks: Gas or electrical pipe Fuel tank or oil-catch pan
IMPORTANT!The mounting plate is NOT connected to the AT-141's internal ground.
Ideal ground points
One of following points is ideal: External ground plate External copper screen External copper foil
(quarter wavelength) radial for each band is suitable for a counterpoise. Install the counterpoise directly below the AT-141's ground terminal. Layout the radial horizontally and as straight as possible.
L : Counterpoise length for the operating frequency [m] f : Operating frequency [MHz] L= 300 1 × f 4
Good ground points
If electrically connected to sea water, one of the following points is usable: Stainless steel stanchion Through mast Through hull Metal water tank
[Example] At an operating frequency of 16 MHz, use a counterpoise with the following length:
Undesirable ground points AVOID the following points, if possible. These connections may cause noise or electrolysis: Engine block Ship's DC battery ground
300 1 × 16 4
4. 7 [m]
For best results, use the heaviest gauge wire or metal strap available. Make the distance between the AT141's ground terminal and ship's ground as short as possible. Supplied ground cable can be used for ground connection to a through mast. Confirm that the through mast is electrically connected to sea water.
All ground cables from the AT-141, HF transceiver, etc. on your ship should be connected to only 1 ship's ground.
AVOID connection to 2 or more points. Voltage difference between 2 or more ship's grounds may cause electrolysis.
AVOID connection between dissimilar metals where
an electric current is present. These connections may cause electrolysis.
R WARNING!-- When grounding to metal hull
Use a Zinc anode to protect the hull from electrolysis. [. . . ] (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.
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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