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19 sty 2017 · I want to use an end-fed wire antenna, but what would be the best length of wire for the 20m and 40m bands? Is there a way to work this out? This is assuming a tuner will be used.
- End-fed-antenna
Typical half-wave end-fed antenna kits include either a 9:1...
- What is a "Random Wire Antenna"
A random wire is just that - a random length of wire,...
- Baruch ATTA
Now available on Stack Overflow for Teams! AI features where...
- End-fed-antenna
The Single Wire End Fed Antenna is probably the simplest antenna to use. But when you start looking around, you find that no one can agree on what length to use. Some say any length will work, some stress odd multiples of 1/4 wavelength, while others lean toward even multiples of 1/2 wavelengths.
The "Best" Random Wire Antenna Lengths. Random wire lengths you should and should not use! Jack, VE3EED - SK. Updated 07-08-2013.
We can divide end-fed antennas into 4 general groups, based on the required impedance matching: quarter wave antennas (or similar) that often don’t need additional matching; short antennas, less than a quarter wave; half-wave antennas, or multiples thereof. other, including multiband operation
That’s where the random wire antenna really shines. In the case of the end fed random wire, some lengths are better than others because of the har-monic effect of the length of the wire and how that effects the various bands on which you wish to operate.
A standard recommendation for the 40m band (see QST, March 1936, p. 32, "An Unorthodox Antenna") is an 84' long end fed and a 17' long counterpoise (6.5' for 20m). While these lengths have been shown to work well on many bands, which is helpful if you're in a hurry to get on the air, read up on the topic and experiment.
12 sie 2016 · End-fed, half-wave antennas (EFHWs) are a half-wavelength long and are resonant antennas on the band of interest. They use some kind of matching network to trasnsform the very high impedance at the end of a half-wave wire to about 50 Ω.
