ANTENTOP- 01- 2014 # 018

Shortened Dipole Balcony Antenna

for the 20- meter Band

It is nine snap on ferrite clips that are snapped on to the coaxial cable. Quantity of the ferrite clips depends on whether the position of the coaxial cable is not interacted on to tuning of the antenna. When the needed quantity of the ferrite clips is found, install a balun. It is possible to find lots description "how to make a balun"in the internet. My balun also is very simple. It is four coils turned around a ferrite ring. It is possible use almost any ferrite ring with suitable sizes and permeability 100- 2000. Picture 2 shows antenna analyzer MFJ- 259B connected to the tuned into resonance antenna. Antenna input impedance is 53- Ohm at 14.075- MHz.

Picture 1 Shortened Dipole Antenna installed at my balcony

Picture 2 Antenna Analyzer MFJ- 259B Connected to the Tuned into Resonance Antenna

Design of the antenna is very simple. For the antenna it was used wire in diameter 0.7-mm (22- AWG). It is possible to use any suitable wire in diameter 0.5- 2.0- mm (25- 14- AWG). Homebrew insulators (made from plexiglass) used at the antenna. Lengthening inductor is wound around plastic tube in 38- mm (1-1/2 inches) diameter. For the inductor it was used electro- technical wire in plastic insulation. Diameter of the copper core is 1.8-mm (13- AWG). Overall diameter of the wire in plastic insulation is 3.8- mm (7- AWG).

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