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Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an
Special page devoted to
Grounded
and Underground Antennas
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ANTENTOP-
02- 2010, # 014 |
Grounded and Underground Antennas |
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Figure
133 Spreading (Low-Height) Dipole Antenna (A) and
its Diagram Directivity in the horizon plane (B) |
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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 |
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Figure 148 Design of
the Trench Antenna |
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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
"Ground." Ropes (item 11 and 12) are stretched out the antenna
inside the trench. |
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Last Updated:
January 19, 2020 21:16
