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

Special page devoted to

Four Element Antenna

for Stack Design

for 145- MHz Band

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ANTENTOP- 01- 2015, # 019

Four Element Antenna for Stack Design for 145- MHz Band

 

The publication is devoted to the memory UR0GT.

Credit Line: Forum from:

www.cqham.ru

By: Nikolay Kudryavchenko, UR0GT

 

 

The four element YAGI is designed for installing in Four Element Stack Antenna System. The antennas not critical to nearest objects. Four such antennas are installed at corners of a quad.

 

Two groups of antennas are connected through a 75- Ohm coaxial cable (the same length from each antenna) in bridge. It is 37.5- Ohm. Then the two groups connected to bridge each group through lambda/4 transformer from 50- Ohm coaxial cable. It is 33.3 Ohm.

Such impedance could be easy matched with 50- Ohm coaxial cable. Sure it is possible use just one such antenna with your 145- MHz transceiver.

 

The antenna does not require a symmetrical unit at feed points. Boom for the antenna may be made as from metal either from dielectric (optimal design) stuff.

 

Figure 1 shows the four elements YAGI for stack design. Figure 2 shows Z of the antenna. Figure 3 shows SWR of the antenna.  Figure 4 shows DD of the antenna.  

 

The MMANA model of the Triangle Vertical Antenna for 20, 15 and 10- meter Bands may be loaded: http: //

www.antentop.org/019/stack _ur0gt_019.htm

 

73! UR0GT

 

Figure 1 Four Elements YAGI for Stack Design

 

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May 1, 2016 22:17

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