ANTENTOP- 01- 2020 # 024

UR0GT Broadband Avia Antenna Modified by RW4HFN

UR0GT Broadband Avia Antenna Modified by RW4HFN

By: Igor Vakhreev, RW4HFN

I have made the UR0GT Broadband Avia Antenna (see Picture). The antenna works good like it was stated. However, I have decided a little modified the antenna to meet my requirements. First modification is to make the antenna work at the 430- MHz.

Figure 1 shows design of the antenna. The antenna has almost uniform SWR at 115- 150 MHz and SWR less 2:1 at 422- 442-MHz. Then I modified the antenna that SWR at 145 MHz became 1:1. Figure 2 shows design of the antenna.

Figure 3 shows Z of the dual band antenna at the 110-150 MHz. Figure 4 shows SWR of the dual band antenna at the 110-150 MHz. Figure 5 shows DD of the dual band antenna at the 110-150 MHz. Figure 6 shows Z of the dual band antenna at the 422-442 MHz. Figure 7 shows SWR of the dual band antenna at the 422-442 MHz. Figure 8 shows DD of the dual band antenna at the 422-442 MHz.

UR0GT Broadband Avia Antenna Made by RW4HFN

Figure 9 shows Z of the antenna intended for 145 MHz at the 110-150 MHz. Figure 10 shows SWR of the antenna intended for 145 MHz at the 110-150 MHz. Figure 11 shows DD of the antenna intended for 145 MHz at the 110-150 MHz.

73! RW4HFN

Figure 2 UR0GT Broadband Avia Antenna Modified by RW4HFN for 145 MHz

References: UR0GT Broadband Avia Antenna (DEWD): http://www.antentop.org/011/avia_011.htm

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