Bedienungsanleitung Icom AT-140 (Seite 5 von 12) (Englisch)

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ANTENNA SYSTEM

■ Coaxial cable

Insulate the lead-in cable of the AT-140 antenna ter-

minal and antenna element from other metal objects.

To prevent interference, keep cables as far as possi-

ble from an antenna, electric pump and other elec-

tronic 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.

■ Ground and counterpoise

Why a ship’s ground is required

The AT-140’s ground terminal MUST be connected

to your ship’s ground. Grounding prevents electric

shocks, interference to other equipment and other

problems. Grounding also ensures effective signal

transmission.

DANGER! NEVER connect the ground terminal to

the following points. 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 con-

nected to the AT-140’s internal ground.

Ideal ground points

One of following points is ideal:

– External ground plate

– External copper screen

– External copper foil

Good ground points

If electrically connected to sea water, one of the fol-

lowing points is usable:

– Stainless steel stanchion

– Through mast

– Through hull

– Metal water tank

Undesirable ground points

AVOID the following points, if possible. These con-

nections may cause noise or electrolysis:

– Engine block

– Ship’s DC battery ground

Electrolysis

All ground cables from the AT-140, HF transceiver,

etc. on your ship should be connected to only 1 ship’s

ground.

AVOID connection to 2 or more points. Voltage dif-

ference 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.

Counterpoise

If your ship is made of FRP, etc. and a good ship’s

ground is not available, connect a counterpoise.

⁄4λ (quarter wavelength) radial for each band is suit-

able for a counterpoise. Install the counterpoise di-

rectly below the AT-140’s ground terminal. Insulate

the ends of each radial from other metal objects. Lay-

out the radial horizontally and as straight as possible.

L : Counterpoise length for the operating frequency [m]

f : Operating frequency [MHz]

[Example]

At an operating frequency of 16 MHz, use a counter-

poise with the following length:

Ground cable

For best results, use the heaviest gauge wire or metal

strap available. Make the distance between the AT-

140’s ground terminal and ship’s ground as short as

possible.

Supplied ground cable can be used for ground con-

nection to a through mast. Confirm that the through

mast is electrically connected to sea water.

R WARNING!— When grounding to metal hull

Use a Zinc anode to protect the hull from

electroly-

sis.

Ask your technical dealer, installer or refer to a tech-

nical book, etc., for RF ground details.

L =

300

4.7 [m]

1 m

39 inches

L =

300

Ground terminal

AT-140

⁄4λ radial for

each band

AT-140_1.qxd 04.4.26 9:16 Page 2

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