Figure 2-22.AS-390/SRC UHF antenna with counterpoise,
Figure 2-24.Wire rope fan antenna.
or ground plane.
frequency ranges. Figure 2-22 shows a commonly used
UHF antenna (AS-390/SRC), which uses this principle.
The ground plane is sometimes referred to as a
counterpoise, as shown in the figure. Together, the
rope fans, whips, cages, dipoles, probes, trussed
counterpoise and the radials form the reflecting surface,
monopoles, and bow stubs. The selection and use of
which provides the reflected image.
different types is often governed by the limited space
TYPES OF SHIPBOARD ANTENNAS
WIRE ROPE ANTENNAS
Figure 2-23 shows various shipboard antennas and
their placements. The complex structures of modern
Wire rope antennas are installed aboard ship for
ships and their operational requirements require the use
medium- and high-frequency (300 kHz to 30 MHz)
of many types of antenna. These types include wire
coverage. A wire rope antenna (figure 2-24) consists of
Figure 2-23.Shipboard antenna systems.