Webb12 aug. 2016 · You use a 9:1 on a random wire antenna, not on an EFHW. Reply. Doug Patterson says. June 14, 2024 at 9:46 pm. 84 feet (with a 17ft counterpoise) is a good length for a NON-resonant (“random wire”) antenna. For a EFHW (note that HW = Half Wave; just like a center-fed dipole), start with the usual 468/frequency in MHz. Reply. Ira ... Webb13 sep. 2024 · RANDOM WIRE ANTENNAS USING THF LDG 9:1 UNUNS An informative, easy-to-understand discussion of Random Length Wire Antennas from Peter of UK's …
9:1 or 49:1 unun for end-fed long/random wire?
Webb26 apr. 2012 · The shortest antenna that has a chance of tuning all bands has an electrical length of 143 feet and should be trimmed to give a quarter wave resonance at 1.72 MHz. WebbRandom Length Radiator Wire Antenna. Delta Loop Antenna. Half Delta Loop Antenna. 1.9 MHz Full-Wave Loop Antenna. Off-Center-Fed Full-Wave Doublet Antenna. Terminated Sloper Antenna. Double Extended Zepp Antenna. 40m - 80m - 160m Short Dipole Antenna. 10m -160m Multiband “Z” Antenna. how to get seraphim in tabs
End-fed wire antenna lengths - Amateur Radio Stack Exchange
Webb27 maj 2013 · Any random length of wire will be adequate to pick up broadcasts. You would not need to ground a random length long wire. For ham radio the common rule of thumb for a random length long wire was at least 32-36 feet for a tuner to work with it for all bands with good results. Webb26 mars 2024 · Any any chart or table showing a specific vertical angle vs. path length, especially if no frequency and/or ionospheric conditions are ... but a the pattern of a 160m doublet has an overhead null on 40m unless the wires are bent. OCFD antennas will often work well enough on the second harmonic if the antenna is bent 90 degrees at ... WebbThe short answer to selecting a wire length is “Any wire length will do!”. That’s almost right and will almost always get you near a practical antenna whether you’re choosing a random length wire, a vertical, or a dipole. There are some minimums that you need to observe. Based on testing done at SGC during the design of each coupler ... how to get sequence formula in excel