RN3DEK Loop Antenna for the 50- MHz Band

RN3DEK Loop Antenna for the 50- MHz Band

Credit Line: Forum from:

www.cqham.ru

By: Yuriy Skutelis, RN3DEK

The antenna made from aluminum pipe coated with PVC. Benefit of the pipe: you may easy cut the pipe with knife; you may easy bend the pipe without any special fixtures; the antenna holds the form; the conduit protected to work in atmospheric conditions. Disadvantage is that the pipe has unknown shortening factor on the 50- MHz band. The factor depends on thickness and composition of the PVC. However the disadvantage is easy overcome to tuning the antenna if the tube for the loop will take a little longer.

Figure 1 shows design of the Lop Antenna for the 50-

MHz band. Perimeter of the antenna is taken in 658- cm, diameter of the tube is 28- mm. The antenna may be made in horizontal (as it is shown on the Figure 1) or vertical installation. Input impedance of the antenna is 200 Ohm. So, for matching with feeding 50- Ohm coaxial cable it should be used transformer 200/50-Ohm.

It is possible use usual transformer on ferrite core or classical transformer made from coaxial cable. Design of the transformer made from coaxial cable you may find at http://www.antentop.org/018/ub5ug_018.htm

Figure 2 shows Z of the Horizontal Loop Antenna for 50- MHz Band. Figure 3 shows SWR of the Horizontal Loop Antenna for 50- MHz Band. Figure 4 shows DD of the Horizontal Loop Antenna for 50- MHz Band. Figure 5 shows Z of the Vertical Loop Antenna for 50- MHz Band. Figure 6 shows SWR of the Vertical Loop Antenna for 50- MHz Band. Figure 7 shows DD of the Vertical Loop Antenna for 50- MHz Band.

73! de RN3DEK

The MMANA file for horizontal and vertical Loop Antenna for the 50- MHz Band may be downloaded at: http: //

www.antentop.org/025/RN3DEK_loop_025.htm

Figure 1 RN3DEK Horizontal Loop Antenna for the 50- MHz Band

www.antentop.org

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