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

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TV Antennas for Distance Receiving

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ANTENTOP- 01- 2015, # 019

TV Antennas for Distance Receiving 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

By: Leonid Pozdnyakov

Credit Line: Radio # 10, 1953, pp.: 53- 54.

 

 

At the original articles published at Radio # 10, 1953, there were described several antennas for distance receiving TV broadcasting stations. Below it is described one of those antennas- it is a Rhombic Antenna.Rhombic Antenna is easy to make and at the same time has perfect parameters.

 

Rhombic Antennas are easy to build and at the same time has high gain and good diagram directivity. However the antennas have some lack. Such antennas required lots space for installations and need at least for masts instead one that used to support traditional directional antennas.

 

Figure 1 shows design of the Rhombic Antenna. Rhombic Antenna is a rhomb that hang up horizontally at the ground. Feeder is connected on to one sharp angle of the rhomb. Terminated resistor is connected on to far sharp angle of the rhomb. The resistorís value should be equal to the impedance of the rhomb at the working frequencies of the antenna. As usual the value is near 700- Ohm. Working frequencies of the antenna may have pass band in hundreds megahertz. So using such matched resistor allows create a super broadband antenna that has impedance near 700- Ohm at the frequencies window in several hundred megahertz.

High gain and high directivity of the rhomb antenna could be explained by combining gain and diagram directivity of the parts of the antenna. The antenna consists of four wires with traveling wave. Figure 2 shows the combination. Each wire has own gain and diagram directivity.

 

Front Cover Radio # 10, 1953

 

The gain and diagram directivity depends on ratio the length of the wire to the working wavelength. So, the summary gain and diagram directivity depends on the ratio the length of the wire to the working wavelength and to the sharp angle of the rhomb.

 

 

Title of the Article

 

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Page- 75

 

75 76 77

 


 

 

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Last Updated:

May 1, 2016 22:19

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