Icom AT-141 Instruction Manual

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ANTENNA SYSTEM
2001 NEW 2001 NEW
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2001 NEW 2001 NEW
Antenna for ship ■
Required antenna element length D
Required antenna element length to achieve full per-
formance varies, according to the lowest frequency.
The lowest frequency Required antenna element length
1.6 MHz band 7 m; 23.0 feet or longer
4 MHz band 3 m; 9.8 feet or longer
The longer the antenna element, the longer commu-
nication distance.
Undesirable antenna element lengths D
DO NOT
use an antenna element such as mul-
tiples of
1
⁄2λ lengths (half wavelength), since tuning
becomes difficult.
L : Undesirable antenna element length [m]
f : Operating frequency [MHz]
n : Natural number (n = 1, 2, 3, ...)
L =
300
f
×
1
2
n
×
[Example]
At an operating frequency of 16 MHz, avoid the fol-
lowing antenna element lengths:
L =
300
16
×
1
2
n
×
9.4, 18.8, ...
For example, if 15 m is selected for an antenna ele-
ment length, you have no problem in the 1.6 to 25
MHz marine bands range.
NOTE: Keep antennas as far away from other ob-
jects as possible, especially metal objects.
Insulator
Backstay operates as
a long-wire antenna.
Insulator
Whip antenna

Icom AT-141 Specifications

General

Brand	Icom
Model	AT-141
Category	Tuner
Language	English