ANTENTOP- 01- 2013 # 017

Receiving Field HF Loop Antenna

Pavel Petrov, UU9JAN, Sevastopol

Credit Line: http://qrp.ru/articles

I need an antenna for my receiver DEGEN- 1103. The antenna should provide a good reception on to HF bands. I would like to take the receiver to a field or hotel room. So, the antenna should be small in sizes and easy to installation. Through some my experimenters I stopped on a Loop Antenna.

Figure 1 shows the design of the HF Loop Antenna. It is very simple antenna and cheap in the used parts. The antenna works fine from 7.0 to 30.0- MHz. Loop of the antenna made of 1- meter length of a TV-Coaxial Cable (75- Ohm). For the Loop of the antenna it is used the braid of the coaxial cable. The length of the cable has RF- Connectors from the both sides.

Then I found in junk box of my wife a plastic box (it was a plastic box from old cosmetic). Inside of the plastic box there were installed two RF Connectors for the TV- Cable, a variable capacitor 2x 250- pF and a toggle switch. At the band 9.0- 30.0- MHz it is used one section of the variable capacitor. At the band 7.0- 15.0- MHz there are used both section of the variable capacitor. The toggle switch turns on the sections to the Loop antenna.

Figure 1 Design of the HF Loop Antenna

Figure 2 Reception with Whip Antenna

Figure 3 Reception with Loop Antenna

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