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HF Helical Antennas: Theory and Practice

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ANTENTOP- 01- 2020, # 024

HF Helical Antennas: Theory and Practice

 

 

 

Figure 16 Tuning Helical Antenna Having Resonance Frequency Higher the Needed

 

 

Practical Installation of a Shortened Helical Antenna

 

After reading the above parts of the article anyone may decide that there is nothing complicated to make a shortened helical antenna. It is really so. At the next part of the article I give some advices on installation of the helical antenna in the limited environment- on the window, balcony and the wall of the house.

 

First at all it needs to find place for installation of the helical antenna.

 

 

Place for Installation of the Shortened Helical Antenna

 

Any antenna likes free space. So we need find a free space for the shortened helical antenna. In the house that is made of concrete such places are windows and balcony.

 

The balcony usually gives a lot of opportunities for installing of the helical antenna. Depending on the dimension of the balcony and the things sitting inside of the balcony it is possible to install a helical antenna with rather big sizes.

 

However it is cannot be the same about window. In the window opening it is possible to install three limited design of the helical antenna. It is vertical installation (that is shown on Figure 17), horizontal installation (that is shown on Figure 18), and the diagonal installation (that is shown on Figure 19).

 

The best option for installation of the helical antenna at a concrete building is the open outside wall of the building. In this case it would be lots free space around the helical antenna. Best solution is to move the helical antenna as far as possible from the wall with wooden or metal mast. It is desirable that the length of the mast would be not less than the length of the helical antenna.

 

 

 

Figure 17 Vertical Installation of the Helical Antenna in the Window Opening

 

 

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January 30, 2021 14:43

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