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"Here's the word on random-wire antennae." Presented for your consideration by Jack, VE3EED. The table below represents half wave lengths and multiples that you DO NOT WANT TO USE!
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Antenna Designs Antenna Safety! Ask Elmer About Batteries...
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2.1. Antenna length based on the following formulars: 1/2 λ dipole (feet)= 468 / frequency in Mhz. 1/2 λ dipole (meters) = 142.65 / frequency in Mhz. Full wave loop (feet) = 1005 / frequency in Mhz. Full wave loop (meters) = 306.32 / frequency in Mhz. Cut wire slightly longer for connecting insulators and pruning. 22-Jun-2007 09:30 AM.
A random length of wire fed directly from the output of your transmitter (Fig-1). The impedance of a end fed wire can be anywhere from a few 10s of Ohms to a few thousand Ohms, depending on the frequency in use and the length of the wire.
The random wire antenna is probably one of the least expensive, easiest and cheapest HF antennas to use if you have a tuner and you want to get the "most" out of a length of "random" wire without having to pull out that calculator, doing
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).
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.
27 sie 2024 · All you need for a random wire antenna is some wire, your tuner, one or more supports up as high as you can get them to string the wire from the supports to the tuner, at least one or two insulators and a little time.
