UR0GT Wideband Antenna for 27- 30- MHz

As well it is not critical the diameter of the vertical antenna and diameter of the wire in coupling loop because the variable capacitor dopes the main match the coaxial cable with the antenna. At the feeding end of the coaxial cable should be installed several ferrite ring- it is needs to isolate the coupling loop from the influence of the coaxial cable.

Design of the Wideband Antenna for 27- 30- MHz is shown in Figure 1. There are three variant of the antenna, A- feeding to the center bottom of the coupling loop, B- feeding to the center side of the coupling loop and C- feeding to the corner of the coupling loop. All of the variant may be suitable for certain installation of the antenna.

Figure 2 shows Z of the UR0GT Wideband Antenna for 27- 30- MHz with feeding to the center bottom of the coupling loop. Figure 3 shows SWR of the UR0GT Wideband Antenna for 27- 30- MHz with feeding to the center bottom of the coupling loop.

Figure 4 shows DD of the UR0GT Wideband Antenna for 27- 30- MHz with feeding to the center bottom of the coupling loop. Figure 5 shows SWR of the UR0GT Wideband Antenna for 27- 30- MHz with feeding to the center side of the coupling loop. Figure 6 shows SWR of the UR0GT Wideband Antenna for 27- 30- MHz with feeding to the corner of the coupling loop. DD of all of the three antennas almost the same.

Vertical radiator needs good grounding. It may be several counterpoises of different length or metal plate under the antenna. The antenna may be scale for other band, for example for 50- MHz.

73! de UR0GT

The MMANA filel of the UR0GT Wideband Antenna for 27- 30- MHz may be loaded: http: // www.antentop.org/024/UR0GT_wb_27-30_024.htm

Figure 2

Z of UR0GT Wideband Antenna for 27- 30- MHz with Feeding to the Center Bottom of the Coupling Loop

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