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- The dipole antenna is a simple and effective choice for beginners in the world of radio. With its low cost and ease of construction, it provides a great opportunity to make contacts on the HF bands. Whether installed horizontally or in alternative configurations, the dipole can offer good performance with the right adjustments.
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Ham Radio Dipole. Basic Introduction. The ham radio dipole is called a half-wave antenna because its length corresponds to an electrical half wave at the frequency for which it is intended. This Page Covers. 1. Antenna System. 2. Dipole Formula. 3. Resonant Length. 4. Transmission Line. 5. Dipole Hardware.
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- Dipole Construction
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A dipole is quite easy to construct. The length of a half-wave dipole might be thought to be the same as a half-wavelength of the signal in free space, but this is not quite the case. A number of effects, including the velocity factor of the wire, the length / diameter of the wire used for the radiating element and capacitive end effects, mean that...
It is easy to construct a dipole. Basically it is simply a half-wave length of wire cut in the middle. Typically it may be set up something like Fig 3. While this may be the ‘standard’ type of installation, rarely is it possible to make an installation exactly like this, and it is acceptable to make it fit the requirements of the location. It may b...
The maximum radiation from a dipole takes place in the centre. Accordingly, this is the most important area of the antenna to keep as high as possible. Coupled with the fact that in many situations it is only possible to have one high mast or high point on the antenna, this often makes an inverted-V dipole (Fig 5) an ideal choice. The antenna is ba...
A dipole antenna is the simplest and most cost-effective HF antenna available. It consists of a half-wave length wire, with a gap in the middle where it is fed. When properly constructed, a dipole antenna can provide excellent performance.
If you operate a dipole fed with coax without a balun, this is happening to you, though you may not notice. The coax shield radiates just fine, and if your signal still finds its way to the other station and you don't give yourself RF burns, then there's no problem.
Oct 15, 2020 · The most common answer—as high as possible—is not necessarily the correct one. A lot depends on your operating style and who you want to talk to. Let’s take a look at these factors and see how high that dipole of yours should be. Some Caveats. There are many variations of the dipole antenna.
Radio frequency voltages at the design frequency are applied to dipole antennas at the center, between the two conductors. They are used alone as antennas, and as the driven elements in other types of antennas that are sometimes slightly modified from an exact half wavelength.
You’ll want to get the antenna up into the air about ¼ to ½ of a wavelength above ground, but you may have to settle for less than that. Dipoles are commonly erected in one of three configurations: 1) flattop, 2) inverted V, or 3) sloper.
