Portable End-Fed 160-10 Meters Dipole Antenna This is the 4th or 5th product that I have purchased 4 or 5 items from ni4l. The B&W Company makes a folded dipole that claims to have a good match on all bands and it does. One may argue that 560 feet is ridiculous for a 40 meter dipole, but keep in mind that the data can be scaled Here are some typical OCF dipoles that are successful designs 160-6 meter Double Off Center Fed antenna layout (using a double tuned stub for better 20/40 meter performance) Here is the 160-6 meter SWR graph using 200 feet of RG213 feed line and an average height above ground of 35 feet: 80-10 meter OCF […] The actual lengths resulted after I performed the tunin… Every antenna is a set of compromises. A Small Wire Loop Antennas for 160 meters, 160 m Balanced Coaxial Receiving Loop Antenna, 160 m broad banded coax inverted L antenna, 160 meter linear loaded Inverted L antenna, 160-meters antenna problems and solutions, Building High Power, High Q, Loading Coils, DM9EEs info site on FCP - folded counter poise (Radial), Easy 160m for telescoping crank up tower, Optimizing half-wave sloper arrays for 160 meters. All that power is lost and does not radiate, and no power is reflected back to the feed point making the antenna have low SWR. The half-wave dipole is very simple to construct. The power going toward the ends encounter the resistor and is consumed as heat. But, for 3.5 MHz it is 141 feet, and at 1.8 MHz we need to have this ideal antenna 273 feet above ground! Also the most common format is for a half wave dipole. Ham Radio operators review new sites every day since 1998, for potential inclusion in the Directory, and to evaluate the best place to list them. The larger the wire, the wider the bandwidth. Plugging this in to the formula (468 / 7.15) gives a folded dipole with a length of 65.45 feet. The calculated and actual lengths are shown in Table 1. An alternate feed method is placing a 6:1 balun at the feed-point and then feeding it with 50-ohm coax. If you remember the single channel TV antennas used years ago, the driven element was a folded dipole. Built like a tank with high-quality materials. This one is no exception.I had to take into account... 1. available horizontal space 2. available supports (tower and trees) 3. a quarter wave vertical is out of the question, at just under 40 meters in height (130 feet)!Granted, I could have considered a top \"loaded\" vertical, with a top coil (inductance) to make up for short physical height.But, I do not like verticals, \"loaded\" or not! If That is the reason they were used for TV antennas since a TV channel is 4 MHz wide. On the transmit side, an … Determine the frequency in MHz. Folded dipoles are very broad-banded. Calculate the total length Calculate the total length of the dipole using the formula above. Works 4, 7, or 8 bands on one length of wire, with no tuner required! On the receive side, the standard 160 meter antenna is a Beverage of some form. Once again the antenna was shipped and received with in a few days. The folded dipole consists of two parallel conductors with the ends tied together. The folded dipole will not radiate its second harmonic, so it is not good for a multi-band tuner-fed antenna. Antennas for 160 meters on a standard half acre (~100 x 200 ft) suburban house lot pose quite a problem. I also have a Loop-on-ground that I can use for Receive, with reduced noise levels. 6 ready to use colors schemes - 3 light and 3 dark. A Truly Broadband, Efficient Low Band Dipole - 1 - W7ZZ and N6RY, c. 2015 My quest for the ham radio equivalent of the “holy grail” – a truly broadband 80 meter dipole – began in the spring of 2008, when I moved into my new Fan Dipole One solution is to add a second dipole connected to the same feedpoint with the second dipole center loaded for the 160 meter band. The dipole was modeled at various heights from .05 wavelengths (7 feet) to 4 wavelengths (560 feet) above good ground. Very Short 160-meter Inverted-V Larry Nelson - K5IJB Constructing a dipole for 160 meters with a length of approximately 254 feet and a height of 50 feet or higher will produce a low angle of radiation. It is a half wave dipole designed for the center frequency of 28.400mhz but should cover most of this 200khz spread with low SWR. The feed-point impedance of a folded dipole at resonance is close to 300 ohms resistive and can be fed directly with 300-ohm TV twin-lead or a tuner with its balun. For use on 160, the 80 meter dipole becomes a T-shaped (top loaded) vertical radiator, fed against ground. This antenna works quite well no Don't expect a low SWR. Fig 1 shows the simple broadband antenna system as used at my station. The basic formula for determining the length of a center fed, half-wave wire Dipole or Inverted Vee antenna is: 468 ÷ freq (mHz) = Length (feet) . Due to the short length, this will probably continue as my only 160 meter antenna at this QTH. At the ends, strip the insulation back several inches, Twist the bare wires together, solder them, and run them through insulators. The 80 meter dipole for 160: Tie your dipole feed lines together in the hamshack. It is also possible to have longer lengths - antennas with lengths that are odd multiple of half wavelengths long also provide a low impedance. When I modeled a dipole Precisely placed on my ... Set Up - Temporary Station in South Africa. The folded dipole will not radiate its second harmonic, so it is not This means that a 40 metre dipole ca… A length of 450-ohm can be substituted for the twin-lead. 30 Meter Pre-Assembled, Heavy Duty Dipole Antenna JETSTREAM - JTLLD130 - ALL BAND 160-6 METER LADDER LINE FED DIPOLE 130' - OUT OF STOCK Our Starting Price: $56.95 The feed-point is in the center of only one of the two parallel conductors. The normal Windom is described as having a 1/3 length leg, and a 2/3 length leg. On 80 meters the 90 foot-long dipole model will produce a signal at least 10 dB lower than that from a resonant dipole. 160 Meter Dipole Antenna at W5JGV At the new QTH in Natchitoches, Louisiana by W5JGV Match 19, 2007 It's been a few months since Bonnie (KB5YSE) and I moved to our new home in Natchitoches, Louisiana. The 4-Band 300 Watt weighs 4 pounds and the 4-Band 3,000 Watt weighs 6 pounds. A length of 450-ohm can be substituted for the twin-lead. The down-side of this antenna is the difficulty in devising a way of mounting a dipole with a Z at the center. Let's try an example: Design a folded dipole for the 40 meter band. Being a reborn Hamsphere 3 user and being on vacation in South Africa. The transmission line is segmented into one electrical wavelength of 50Ω coax and an electrical quarter wavelength of 75Ω coax. Another antenna added from the antenna plan is a 160 meter ¼ wavelength inverted L. A 130 foot length of 12 gauge PVC covered stranded wire slopes up from the ground system to the 40 foot level of the 45 foot tall fiberglass flagpole (about 60 feet of wire length) and then proceeds about 70 feet toward the far back edge of my property. When constructing a folded dipole, the formula for calculating the length of it is the same as for any dipole. In other words an 80-meter Windom 137 feet long would have one leg 45.667 feet long, and the other leg 91.333 feet long. The multi-band H-Quad full wave antenna is suppressed to yield a much better performance than what I get. Lengths were calculated using the formulas given later in this article, using a center frequency (Fo) of 3.75 MHz and VF (velocity factor) of 0.66. This could be 50 ohm types such as RG58, RG8X, RG8, RG213, or … This gives a low impedance feed impedance and this matches nicely to 50 Ω feeder. The most straightforward way to install a dipole is as a horizontal antenna, although this is by no means the only way. Furthermore, it is usually installed much too close to the ground, relative to its operating wavelength, which turns it into a NVIS (Near Vertical Incidence Skywave) antenna, only good for very short-range communications. Be substituted for 160 meter dipole length twin-lead 7.15 MHz OK as a first 160 antenna the length of wire, reduced... 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