Bi-directional Two wire Beverage by OK2ZAW

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The beverage is a long wire antenna installed very close to the ground. The antenna should be longer than 1 wavelength and installed at a height of less than 0,05 wavelength above ground. The beverage is usually terminated in a resistance at the end (opposite the feedpoint).
Beverage antennas provide one of the least expensive and most reliable ways to improve DX capabilities on the low frequencies.
With careful attention to design and construction, a single beverage antenna can be made to cover two directions with excellent performance over a very wide frequency range.
The transformer at the end of the beverage is designed to match impedance of the antenna.
A two-wire bi-directional beverage requires the antenna element to operate a balanced transmission line, as well as a conventional long wire antenna. The parallel wire line used to construct the antenna must be excited under near-perfect balanced transmission line conditions.
This is why each of the parallel transmission line wires must be parallel to the ground. A line should not be constructed in a vertical fashion, using single support poles with one wire under the other. The closer the wire spacing of the line, the lower the impedance of the line, and the less critical installation-related unbalances become. The higher you install the line above ground, the less unbalance any unequal coupling to earth creates.
Source: W8JI, ON4UN

NOTE: NOTE: TWO coax output beverage antenna works right only, when both ports are loaded with right impedance on the same band. It means that you cannot leave second port open or short! Also if you use first port on 160m and second on 80m than second port have to have load impedance on 160m and first port on 80m. I will have got right antenna switch for it soon, please email me!

Nice article about the Bi-dir principles by ZL3IX

Main functions:


One coax switchable

Two coax

Terminator

Download

Beverage
One coax switchable sch eagle747
Two coax sch eagle652
Terminator sch eagle471
Enclosure Gewiss GW44204 [IP56 100x100x50mm]
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