Antenna System; Antenna For Ship - Icom YPL 880 Instruction Manual

1

ANTENNA SYSTEM

n Antenna for ship
Required antenna element length
Required antenna element length to achieve full
performance varies according to the lowest frequency:
The lowest frequency Required antenna element length
1.6 MHz band
4 MHz band
The longer the antenna element, the better the
antenna efficiency.
Undesirable antenna element lengths
AVOID
multiples of
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 = × × n
f 2
[Example]
At an operating frequency of 16 MHz, avoid the
following antenna element lengths:
300 1
× ×
n
L =
16 2
1 m 39 inches
For example, if 15 m is selected for an antenna
element length, you have no problem in the 1.6–25
MHz marine bands range.
1
7 m; 23.0 feet or longer
3 m; 9.8 feet or longer
1 λ (half wavelength) for
⁄
2
9.4, 18.8, ...
Insulator
Backstay operates as
a long-wire antenna.
Insulator
NOTE: Keep antennas as far away from other
objects as possible, especially metal objects.
Whip antenna