ANTENTOP- 01- 2020 # 024

End Fed 6- meter Zepp Antenna with Resonance at 2- meter Band

Antenna was installed at 3.5- meters above the ground at the backyard. Photo 5 shows 6- meter Zepp antenna at the backyard. The antenna fed through 50 Ohm coaxial cable that has near 15 meter length from my shack to the 3- meter length coaxial cable connected to the quarter wave transformer. Coaxial cable going from my shack to the coaxial cable of the 6- meter Zepp antenna was checked with MFJ- 259 when the coaxial cable was loaded to a 50- Ohm dummy load. It was 1.0:1.0 SWR at 1- 150- MHz. As it mentioned early, the antenna with coaxial cable was tested at home and the antenna has 1.0:1.0 SWR at 50.1- MHz.

Photo 4 Coaxial Cable Connection to the Two Wire Line

Photo 5 6- meter Zepp Antenna at the Backyard.

So I supposed that the antenna should have 1.0:1.0 SWR at 50.1- MHz. With help of MFJ- 259 I measured the antenna parameters. Table 1 shows the antenna parameters. The resonance frequency of the antenna was 51.627-MHz that is up to 1.527- kHz from the 50.1- MHz. It was very surprised me.

Of course, the ambient conditions are influenced to the antenna resonance but should not be in so much level. Then I measured the SWR with help of usual SWR meter- it was an old Handic, made in Japan. Photo 6 shows the SWR meter at the antenna cable. The SWR meter was verified by me with several loads- 25, 50, 100, 125- Ohm. Table 2 shows data measured with the Handic SWR meter, ICOM, IC-7410 transceiver send 50-W into the antenna.

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