ANTENTOP- 01- 2014 # 018

44 Feet Dipole. Where is the Truth?

After doing my homework with the mathematics, I decided to use a different dipole length for my multiband HF wire antenna... The experimental antenna length that worked best for me was 39 feet long on each leg, or 78 feet overall length, that is 11.8 meters each leg or  23.7 meters overall length.

(Figure 4 shows the 78- Feet Dipole Antenna.)

In order to make it fit into the available space the last 6 feet of the antenna on each leg are placed at a 90 degrees angle...

In order to increase the bandwidth of my 78 feet or 23.7 meters dipole fed with open wire line of  400 ohms, I used two wires on each leg, that are spread apart from the center insulator at a distance of 50 centimeters... The open wire transmission line is connected to a junction box, where I can select a 1 to 1  or a 4 to 1 balun that is connected via coaxial cable to the PI network antenna tuner...

73 and DX
Arnie Coro
radio amateur CO2KK
Host of Dxers Unlimited radio hobby program
Radio Havana Cuba

Note I.G.: Below you can see SWR (at 350- Ohm Terminal) for 78- Feet Dipole Antenna placed at 10 and 20- meters above real (simulated by MMANA) ground. As you can see the 78- feet antenna really has at the amateur bands SWR/Impedance that could be matched with ATU.

The antenna is real compromise between 88- 66- and 44-Feet Dipole Antennas. Gain and Diagram Directivity of the antenna is not bad.

Files MMANA for the antennas you may download at

http://www.antentop.org/018/co2kk_018.html

73! va3znw

SWR (at 360-Ohm Terminal) 78- Feet Antenna Placed at 10- meters above Real Ground

SWR (at 360-Ohm Terminal) 78- Feet Antenna Placed at 20- meters above Real Ground

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