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Learn how to avoid the half wave lengths and multiples that cause high swr and tuning problems with random wire antennas. See a table of frequencies and lengths to use or avoid for optimal performance on HF bands.
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Wire Lengths for Various Band Combinations. The graph below shows lengths to avoid for different collections of bands. The fewer bands, the fewer high impedance regions to avoid. You also want the antenna to be at least 1/4 wavelength long for each band you plan to use. For instance, to work 40m be sure the antenna is at least 10m or 33' long.
Learn how to avoid the worst lengths for random wire antennas on different HF bands and find the best ones for low swr and good loading. See a table of lengths to stay away from and a list of recommended lengths based on multiples of half wave.
Learn why you should not use certain lengths of random wire for HF antennas and how to find the best ones. See a table of frequencies and multiples of half wave that cause high swr and tuning problems.
24 paź 2024 · A random wire antenna length calculator takes the desired frequency range (in MHz) and suggests wire lengths that are less prone to resonance issues. It calculates lengths that are half-wave multiples (like 1/2λ, 1λ, 2λ). Use random lengths that are not any of these values.
Learn how to use a 35' random wire antenna with a 9:1 UnUn to operate on multiple bands with a tuner. See the ideal lengths, configurations, SWR readings and tips for this simple and portable antenna system.
Learn how to calculate the best lengths for random wire antennas on different ham bands and modes. See graphs, formulas, code and examples for end fed antennas with counterpoise.
