Alinco EDX-3 사용 설명서 - 페이지 9

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The explanation about grounds and counterpoise herein are for your reference

purposes. The best ground for you depends on options such where and how to ground,

or the diameter and material of the radials, bare wire or covered, and conditions of

installation.

NOTE

It can't be explained quantitatively and theoretically in practice. You may find information

about ATU and its ground theories on radio magazines and on the internet.

Electrolysis

All ground cables from the EDX-3, 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.

Transceiver

Control

cable

Antenna

cable

Counterpoise

In case a good ground is not available, connect a counterpoise as shown

below.

1⁄4λ radial for

each band

1⁄4λ (quarter wavelength) radial for each band is suitable for a counterpoise.

Install the counterpoise directly below the EDX-3's ground terminal. Insulate

the ends of each radial from other metal objects. Layout the radial

horizontally and as straight as possible.

L : Counterpoise length for the operating frequency [m]

f : Operating frequency [MHz]

L = 300

Notice: The loaded ratio of 0.95 is indicative. It is affected by your radial

EDX-3

Ground terminal

EDX-3

× 0.95 x odd number (1,3,5...)

cable materials and condition of the installation.

Antenna

element

（線を張ったり曲げたりするときは碍子

　などで壁や金属から絶縁）

Ground

wire

Antenna element

ANTENNA SYSTEM