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Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an

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Grounded and Underground Antennas

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ANTENTOP- 02- 2010, # 014

Grounded and Underground Antennas

 

Figure 133 Spreading (Low-Height) Dipole Antenna (A) and its Diagram Directivity in the horizon plane (B)

 

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. 

 

 

Figure 148 Design of the Trench Antenna

 

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.

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.

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