![]() (see FIG.1)įIG.3 shows the Drive-element (Dipole) and the Hairpin construction on theĭipole's plastic box. The Drive Element is an "Open - Dipole" (two pieces of about "Lambda/4") with overall length 0.92 m. YAGIMAX antenna design program including aĬalculation-tool for the Hairpin's dimension, depending on "Data" of the 3), which is very simple and effective "matching method". Similar) in order to minimise the SWR ratio to 1:1 "matching system" for a 50 Ohms coaxial cable feeder ( H-100, RG-213 or ![]() If you connect a 50 Ohms coaxial cable directly to dipole, the SWR is 1.3:1 Ĭenter frequency (145,000 MHZ) its 65 Ohms. ![]() Boom between Reflector-director) with excellent F/B ratio ( 20 DB). Greater of the transceiver output (without Coaxial-Loss), i.e if you haveĪ VHF transceiver with output Power of 50 Watts, your ERP will be multiplied 4 times = 200 Watts (in the forward gain direction). Gain, this antenna offering an Effective Radiation Power 4 times GAIN is about 8,17 DBi (6 DBd) on 145 MHZ. Shows a table for the SWR, GAIN and F/B ratio. FIG.1 shows a 3 elements VHF Yagi "homebrew" antenna
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