A set of nine plug-in type filter assemblies is furnished with the equipment and covers the entire vlf,
lf, mf, and hf bands. Only seven of the assemblies may be installed at one time, and you have the option
of selecting those you need to cover the most used frequency bands.
Figure 3-12 illustrates how the filter assembly is used in combination with other units to pass an rf
signal from an antenna to one or more receivers.
Most multicouplers for the hf range are designed for use with either transmitters or receivers,
although some are used with both. There are a large number of channels in a multicoupler so that many
transmitters can be used at the same time on one antenna. This is especially true in the 2- to 12-megahertz
Figure 3-15 shows you an antenna coupler group designed primarily for shipboard use. Each coupler
group permits several transmitters to operate simultaneously into a single, associated, broadband antenna.
You can see this reduces the total number of antennas required in the limited space aboard ship.
Figure 3-15.Antenna coupler group.