Figure 148 shows design of the Trench Antenna. Trench Antenna
consists of the three major parts.
Part 1- radiation wire, part 2- feeder (as usual a
coaxial cable), part 3- grounding system.
Radiation part (item 1) made of insulated
wire in 30 meter length and diameter near 1-mm. Insulators (item
5 and 6) are placed at ends of the wire. Feeder (item 2) is length
of coaxial cable in 10 meters. If antenna is used with low power
transmitter it is possible fed it through thin coaxial cable RK-1.
If antenna is used with middle or high power transmitter
it is possible fed it through thick coaxial cable RK- 3 or RK-6.
Central wire of the coaxial cable from the one side is
soldered to Radiation part (item 1), from other side is soldered
to plug (item 6) that is mounted inside insulated box (item 7).
Bandage (item 8) fastened the ground of the coaxial
to additional bare wire between insulators (item 5).
Grounding system (item 3) made of six length of wire
in 1.5- meters. Al the wires are soldered to wire between insulators
(item 5). At the transmitter the ground of the coaxial through
wire (item 9) with plug (item 10) is connected to the transmitter’s
Ropes (item 11 and 12) are stretched out the antenna
inside the trench.
Trench Antenna may be installed in open or
closed trenches as well as at low height (less the 100- 50- cm)
near the ground. Radiation part is stretched between wooden pegs
installed at the opposite sides of the trench.