End-fed wire antenna lengths - Amateur Radio Stack Exchange End Fed Half Wave Antennas - Elgin Amateur Radio Society This is a followup video to #344 where I assembled the 49:1 UNUN kit from HF-Kits / ARRL. /Length 10 0 R Even better would be shortening to 53'. As typically Built with the same craftsmanship as all our other For those that enjoy endfed antennas but want to run more power, Balun Designs now offers an excellent alternative. Hertz Antenna" shows in line 2 of the table that a similarly installed VSWR analysis of the antenna in the field showed that VSWRs between 3-5.5 from 40M to 10M. That meant calculating all the way to 32 multiples of a half wave on 10 meters. >> << EFHW Antenna and 49:1 UnUn | WorldwideDX Radio Forum 74 0 obj <>stream Therefore, we came up with the following numbers to avoid (IN FEET): These lengths in the table beloware the culprits that cause all of the trouble when using random lengths. recommended on VE3EED's page because I use all halfwave Random Wire Antennas - Best Lengths To Use For Random Wire I imported my spools from the US, but I have seen them on Ebay in the UK. Several ways exist to bring the wire's high impedance feedpoint closer to the desired 50 ohms, including use of a 49:1 or 64:1 unun, which eliminates the need . This transformer converts the impedance at the end . 49:1 or other high ratio transformers are for resonant "cut to frequency" antennas like the traditional zepp/fuchs antenna. installed, it is a compromise antenna but great for portable use because Allows the internal tuner of most rigs to tune remotely mounted single wire antennas. used by hams for dipole lengths. Hopefully these random wire length calculations will help us all make this "easy" antenna work better! It's an efficient way to get all the multiples How We Flew An End-Fed Half Wave (EFHW) Ham Radio Antenna On A - KM1NDY
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