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The calculator first computes the antenna length (1/ 2 ... 3/2 λ, and 2 λ Single Wire End Fed lengths. Output data is in US/Imperial and Metric formats. Table of Horizontal Antenna Lengths from 1 to 7 Half-Wavelengths: This section contains three tables that can calculate antenna shortening factors and antenna lengths, including quarter-wave verticals over perfect ground, half-wavelength dipoles in free. Completed 9:1 UnUn. These are sometimes known as a Magnetic Longwire Balun. Its really an impedance transformer (9:1) to feed a high impedance, end fed (unbalanced) random wire which is likely to be a few hundred ohms, and transform it into. The antenna farm also includes two random-length, long-wire antennas terminated in so-called Magnetic Longwire Baluns (MLB); these baluns are connected to RG58C/U coaxial cable transmission lines approximately 10-15 m long. One long-wire antenna is oriented 330° TN. Approximately one-half of the other long-wire antenna is oriented north-south .... maybe better. Length of counterpoise should be a minimum of 30-40 feet but not the same length of the antenna wire. Shorter length counterpoise wires can be used if operation is confined to 40m or higher. Any counterpoise should be at least 1 foot above ground running away from or perpendicular to the antenna wire.
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The Traditional Long-Wire Antenna, as its name implies, is a simple single length of wire of a thickness strong enough to support its own weight, insulated or not, as long and high as the local geography allows. Technocrats will call this an Inverted L as the. . The elevation angle columns tells us that the lower we place a single unterminated long-wire antenna, the faster the elevation angle of maximum radiation decreases as we increase the long-wire antenna length. Fig. 4 converts the numbers in curves. The stair-stepping results from the fact that elevation angles use a 1-degree increment.. An 80-10 end-fed half-wave antenna can be a very good performing part of an HF station. But its performance depends heavily on a well-designed and carefully constructed 49:1 unun, which matches the long wire impedance to within tuning range of operation. But the perfor-mance of an end-fed antenna is also very dependent on height above ground.
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Never stretch to reach a point– instead, move the ladder. Have the ladder on a secure footing, and have someone there to hold the ladder. 3. Make sure your antenna is in a safe place, high enough so people or pets won’t walk into it by accident. (Plus, the higher up you get it, the better it works). 4.. In the case of a 1:9 UnUn, the power line (coax) impedance of 50 ohm will be transformed up to an impedance of 450 Ohm. After all 50 x 9 = 450. This means that the length of the long-wire antenna must be chosen in such a way that the impedance in the feeding point on as many frequency bands as possible is about 450 ohm. Quarter-wave matching section length in feet = 246 * cable's velocity factor / frequency in MHZ. If you buy cheap coax (whether its 75 ohm or 50 ohm) the velocity factor is .66 If your smart you buy the better coax which has a velocity factor of between .80 and .84 please check the manufacturers specs to get this number. Long wire antenna random wire [ Home ] [ Up ] Related Pages: Groundplane Verticals (they are generally end-fed 1/4 wave radiators) Verticals and baluns End-fed half wave J-pole ... The antenna itself works just as well as any other wire of similar height and length. Any or all problems are in the counterpoise and feed system. The difficult problems associated with random wire or longwire antennas are. If your antenna has a stable impedance of 450 ohm over 3-50 MHz, than you don't need a tuner, otherwise you still need a tuner, but this balun helps a lot to tune wires to 50 ohm. In my case i can easily tune a 5 m length wire to 80 m band with LDG 100 tuner, without this balun i cannot tune this short wire..
Some of these numbers are too close to squeeze in between them. Here are the final numbers (in my opinion) in green below that would be good for a long-wire antenna: ( You may want to make a note of them) REVISED: 29 35.5 41 58 71 84 107 119 148 203 347 407 423. REVISION NOTE: We had a note from James, KB5YN, pointing out that one of my so ....
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