Dipole antenna length calculator

~ Antenna Notes ~ 1/2 Wavelength Dipole: Length L(feet) = 468/f(MHz). Length L(meters) = 142.5/f(MHz). Add 4.7 percent to L for an Inverted V configuration, depending on apex angle. The antenna height (H) above terrain should be 20 feet minimum. Each leg should be 1/2 of the calculated ant. length (L), with several inches added for tuning and ...

For example, a frequency of 14.300 MHz has a wavelength of 20.979 meters. This relationship between frequency and wavelength is especially important to antenna design because the wavelength of a frequency is used to calculate many of the dimensions of an antenna’s design. Dipole Antennas Inverted V dipole antenna calculator to calculate the total length of a particular dipole inverted Vees antenna for the given frequency. From the drop down select the one you wish to calculate, either full wavelength, half wavelength or quarter wavelength.
The Half-Wave Dipole Antenna The most widely used formula to calculate the approximate overall length of wire required for a dipoleis:468 / frequency (MHz) = length of wire in feet.

if I am feeding a dipole antenna, do I similarly need to make sure that the feed line length is the correct length to allow for the current distribution to be at the correct points be nulls by adjusting the FEEDLINE LENGTH? If you have a 300-ohm dipole, and feed it with a 300-ohm line, and drive it with a 300-ohm generator (as far as I know ...

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Dipole antenna length calculator

10 Meter and 6 Meter Rotatable Half-Wave Dipole Antenna The half-wave center-fed dipole is one of the most popular antennas in use today. In free space the center-fed half-wave antenna has an input impedance that is a close match to 50 ohm coax and to most radios that have a 50 ohm output impedance.

The antenna system described here is simpler than any of its predecessors and has the following features: A 2:1 SWR or better is achieved over all or most of the 80-meter band. Antenna length and appearance are the same as those of a conventional half-wave dipole. Consequently, it's lightweight and has small wind and ice loading. Study of the Off Centre Fed Dipole Antenna - G8ODE Short Long Feed point The Off Centre Fed Half-wave Dipole The Off-Centre Fed Half-Wave Dipole, more commonly referred to as the OCFD, is very popular because it offers good performance as a multi-band antenna using an antenna matching unit in conjunction with a 4:1 or 6:1 current balun. Background.
Oct 17, 2017 · An end fed half wave antenna is one of a specific length depending on the frequency that it is to be used on, for example, an end fed half wave antenna for 80 meters is about 130′ long. The length of a half wave antenna is calculated using the following formula: L (ft) = 468 / f (freq in mhz).

The whole antenna is built inside lengths of 20mm plastic conduit, with the feed housed in an "inspection box" T-piece. This offers sufficient rigidity and weather-proofing, once the ends of the conduit are sealed with stoppers. A third section of conduit houses the feeder. The flat VSWR response is characteristic of a low-impedance centre-feed.

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