RA1AFS Universal Antenna for the HF Bands

RA1AFS Universal Antenna for the HF Bands

Credit Line: Forum from:

www.cqham.ru

By: Vitaliy Nekrasov, RA1AFS

Indoor antenna at apartment building is all time it is not an easy task to do. However the Simple Dipole Antenna that may be installed at the wall of the building is covered bands from the 80- m up to 10- meter band. Figure 1 shows the design of the Simple Dipole Antenna.

Figure 2 shows the Simple Dipole Antenna at the wall of the building. As you can see, the antenna is installed on the usual fishing pole. Active radiator in length of 7.3- meter takes most length of the fishing pole. The counterpoise of the antenna going to the balcony, when it was twisted to a roll and then connected to the transformer 1/9.

You may found lots of design of the transformer 1/9 in the Internet or at Antentop site. Figure 3 shows the Simple Dipole Antenna that is going inside of the balcony. White one is the transformer 1/9. At left side of the transformer you may see the roll of the coaxial cable that is made an RF Choke. White wire still formed a counterpoise. Figure 4 shows parameters of the Antenna at the 80- meter Band. Figure 5 shows parameters of the Antenna at the 40- meter Band. Figure 6 shows parameters of the Antenna at the 30- meter Band. Figure 7 shows parameters of the Antenna at the 20- meter Band. Figure 8 shows parameters of the Antenna at the 17- meter Band. Figure 9 shows parameters of the Antenna at the 15- meter Band. Figure 10 shows parameters of the Antenna at the 12- meter Band. Figure 11 shows parameters of the Antenna at the 10- meter Band.

Figure 2 Simple Dipole Antenna for HF Bands on the Wall of the Building

73! de RA1AFS

Figure 1 Simple Dipole Antenna for the HF Bands

www.antentop.org

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