Antenna System; Antenna For Ship; Antenna For Land Operation - Icom AT-130 Instruction Manual

ANTENNA SYSTEM
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Antenna for ship
Antenna for land operation
Required antenna element length
Required antenna element length to achieve full perform-
ance 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 better the antenna
efficency.
Undesireable antenna element lengths
AVOID
multiples of 1/2A (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, ...)
300
1
L = X X n
f
2
Insulator
Backstay operates as
a long-wire antenna.
Insulator
antenna
[Example]
At an operating frequency of 16 MHz, avoid the following
antenna element lengths:
For example, if 15 m is selected for an antenna element
length, you have no problem in 1.6-25 MHz marine
bands. NOTE: Keep antennas as far away from other objects as
possible, especially metal objects.
300 1
L
16
— X
2
X n ti 9.4, 18.8, ...
1
m 39
inches
In some countries, HF transceivers can be used for land
mobile operation. Ask your Icom Dealer for details, since
the radio law varies according to countries.
For land mobile operation on 4 MHz and above, an
optional AH-2b ANTENNA ELEMENT is available. The
AH-2b includes a sturdy tow hook mount system for
holding a
2.5
m;
8.2
feet stainless steel antenna element
plus all the necessary hardware.
Refer to the AH-2b instruction manual for the AH-2b and
AT-130/E installation to your vehicle. Ask your Icom
Dealer for details.
Connect a suitable antenna element for a coastal station.
To achieve full performance, refer to "Required antenna
element length" above.
OMB
AH-2b
I
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