A full-size ( = ½λ) dipole antenna for the 20 mtr band spans about 10 meters (33 ft). Both antennas perform well given the conditions at the time. Yes, I’ve had lightning hit an antenna and yes I had to repair some damage. The dipole was modeled at various heights from .05 wavelengths (7 feet) to 4 wavelengths (560 feet) above good ground. On 20 meters, this antenna shows negative gain over a dipole. Tests on the compact vertical dipole were carried out from June 30 While thinking about the design of a new antenna for a 30 x 50 foot plot of land, I wanted the antenna to be easily erected/dismantled for both stealth and portable operation. 20-meter horizontal dipole with its center at 20 feet and a 130-foot multi-band end-fed antenna. It was designed for the 20 meter band and works well on DX! 20 meter dipole on 40 The Efficiency=poor. Made from high quality 16 AWG stranded insulated wire. Dipole antennas are the simplest practical antennas from a theoretical point of view; the current amplitude on such an antenna decreases uniformly from maximum at the center to zero at the ends. For example, the 20 meter band dipole antenna is symmetrical so the noise level will in many cases be quieter compared to asymmetric antennas. The most exciting one was on 14.061 with WB5USB, a SOTA activator in New Mexico on Ortiz Mountain, 1110 miles southwest! to affirm that the antenna is the determining factor for success when it comes to one’s station set-up. 3). The vertical antenna has many devoted supporters in the ham community who claim to get fantastic results, 2. Just like my135 foot off crenter dipole that's 90 feet on one end and 45 on the other, it doesn't even compare to the G5RV and my 40 meter dipole. The Wire Size can range from 16 AWG to 12 AWG. Dipole Antenna Calculator. One of the 20 mtr antennas that I built is a half-size 2-element "yagi" beam antenna, based on a design by Gary Hanson (KJ5VW), ref. About the Buckmaster OCF Dipole If we drop the 20 meter antenna to 20 feet above ground, we not only lose over 2.5 dBi of gain, we’ve got a classic cloud burner, sending almost all our RF energy straight up! 12 meters may also work on the 4-Band 300 watt model.The 4-Band antennas are OCF (off-center-fed), with a 23 foot leg and a 45 foot leg, totaling 68 feet. Assembling the 20 Meter Antenna Matchbox For the popular 20 meter band, a suitable inductor can be made with 26 turns of enamel coated # 22 copper wire wound on a T80-2 toroid as pictured on the lower left. It is hard to beat a single band dipole unless you have a tower/rotator/Yagi. 2018-10-18 This afternoon, before replacing this antenna to give my lonely 35 ft end fed one some attention, I had a couple QSOs on 40 and 20. The larger the wire, the wider the bandwidth. Trim the wire ends to extend about 1.5”, and carefully The "driven element" of such antennas is a dipole. However, it is possible to combine several 2-element Yagis on the same boom, e.g., for the 20-17-15-12-10 meter band (ref. 15-40 Metres Super Hi-Q Loop Antenna MFJ-1886TR. Voltage = High in the tuner, so your 100 watt tuner can now take about 25 watts before it starts arcing and popping. Figure 6 — An antenna comparison on August 5, 2018. 14-30 MHz Portable Box Fan Loop Antenna MFJ-1786. The Pacific Antenna Dual Band Trap Dipole kit provides a lightweight, portable trap dipole. Full-size on 20 Meters, ultra-efficient end-loading on 40 Meters. A hidden benefit of this 3/2 wavelength 20 meter dipole was getting resonance at 7.100 MHz in the 40 meter band and finding some matching in the 75 meter band. 4-Band antennas cover 40, 20, 10, and 6 meters, with no tuner required! Has a length of 34 feet (10.2 meters). THE HALF-SIZE 20M YAGI. Enter the desired operating frequency in megahertz to get a good starting length for a dipole in both feet and meters. The antenna is designed to be fed with 50 or 75 Ohm Coax Cable of most any length with a Balun. 10-30 MHz Hi-Q Deluxe Loop Antenna MFJ-1788. The weather was good for Seattle, no rain and in … I'm not sure what he was using though his QRZ page would suggest it was a KX-3 and vertical or end fed antenna. This item MFJ-2220 20 Meter Dipole FT-891 FT891 Yaesu Original FT-891 HF/50 MHz All Mode Analog Ultra Compact Mobile/Base Transceiver - 100 Watts - 3 Year Warranty Xiegu G90 HF Amateur Radio Transceiver 20W SSB/CW/AM/FM 0.5-30MHz SDR Structure with Built-in Auto Antenna Tuner After the initial installation, the first step was to measure the VSWR. On 20-meters, gain of the "20 through 10 meter" transposed feed lazy-H is much less than a regular dipole. Dipole Antenna Length Calculator Dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. This is a great first antenna! The Infamous Attic Dipole. I have the 40 meter dipole hanging, but not hooked up. 1. Oh…you can use the 40-meter dipole on 15-meters without modification. The reasons for this selection as the first antenna to be installed are that. How to build a 20 Meter Ham Radio Dipole Antenna for Portable Ham Radio. The vertical dipole, also easy to build, is not real popular with hams. 6.15 dBi (2.56 dBi down from optimum) and near vertical radiation pattern, we have an NVIS cloud burner. The measurements below are for building a simple Dipole Antenna. A full-size ( = ½λ) dipole antenna for the 20 mtr band spans about 10 meters (33 ft). Therefore it is best to make the centre of the dipole as high as possible. One is that the maximum radiation from any antenna is from the points of high RF current, and a half-wave dipole has this maximum at its centre and for a few feet on either side of the feeder connections. Searching for a half-size half-size 2-element Yagi, I found the design by Gary Hanson (KJ5VW), ref. HRO Discount Price: $74.95 * Buy It *After Coupons & Promotions. I have a trapped 20/40 M dipole at "right angles" to this antenna, but at 35 feet. Certainly in a fixed setup this antenna has its advantages. The vertical dipole has a very small foot print and requires no radials, 3. ALPHA-DELTA DX-20 ALPHA DELTA 20 Meter Dipole Kit Full-Size Monoband Antenna 34' Long. DX Engineering HEXX Beam Antennas are simply the best choice for a small and lightweight directional HF beam antenna. Your next step, after getting some air time, will be to insert some traps in that dipole so you can use it on 20-meters. The antenna that I put up first was a vertical dipole for 10, 15, 20 and 40 meters. And the antenna is a 80 meter off center dipole. Same construction as MFJ-17758. I planned to take down this trapped dipole and replace it with an Alpha Delta 40M dipole at right angles to this 20M dipole. There are better ways, use some of … This can be done using the radio’s VSWR meter or an antenna analyzer. The antenna is thirty-three feet in length and can be turned by a medium duty antenna rotator. One may argue that 560 feet is ridiculous for a 40 meter dipole, but keep in mind that the data can be scaled down to a 10 meter dipole with similar results. And that’s all there is to it! Mac, AF4PS, FP –51 (Note: This was installed at a previous QTH) I will be the first (or millionth, remember, I’m from FL!) 20 Meter band dipole antenna including 150 Watt 1:1 BalUn, DIY kit. Made with stranded 14 awg UV insulated Wire. The antenna gain is about -3 dBd on 14 MHz, or half the radiated power of a regular dipole! Overall length is 40 ft. DX-LB Low Band Dipole Covers 160-80-40 meters with an overall length of only 100 ft. Antenna performance and 2:1 VSWR bandwidth is site dependent and varies with height above ground and surrounding objects. Dipole antennas for 20 meter band category is a curation of 22 web resources on , 20m mini dipole antenna, 20m QRP Dipole, W3FF Portable Dipole. on 40 meters. The windom beats the pants off of the regular dipole. A Compact 20-Meter Vertical Dipole for Stealth and Portable Applications This antenna earned an Honorable Mention in the 2018 QST Antenna Design Competition. by portableham | Feb 5, 2020 | Contests, Featured, POTA Activation, Roving. 10 Through 20 Meter Vertical Dipole (With a novel matching method) By KL7JR John F. Reisenauer, Jr. We all know the horizontal dipole is one of the easiest antennas to build and is very common with new and old hams alike. Attic Fan dipole antenna that allow to operate QRP from 40 metres to 10 metres, specifically 40, 20, 17, 15 & 10 meter band (by M0WYM) The Fan Dipole Fence The FFD is a multiband antenna… The inverted V dipole antenna has a number of advantages. 35 Foot 20 Thru 6 Meter Single Band Dipole Antenna MFJ-1780. MFJ-1785 Rotatable Dipole Instruction Manual 2 MFJ-1785 80-40-20 Meter Rotatable Dipole Introduction The MFJ-1785 legal limit Rotatable Dipole operates on the 20, 40, and 80 Meter bands. 1. I had never made a homemade dipole antenna and I purchased the pieces I needed awhile ago. According to Noll, "reasonable 75-meter results can be obtained by using a tuner to establish resonance on the 75-meter band." The table below tabulates the results. Place a 1:1 Balun on the Antenna end of the Feedline. The better your antenna, the more success you will … The dipole antenna still remains the primal antenna. If the antenna had to be brought down to adjust its length I wanted to do it before I secured the cables and finished the installation. 20 meter dipole antenna on 40 = poor Efficiency with Low Power. While this vertical dipole has its limitations, it has the advantage of taking up little space, requires no radial system, and is inexpensive to make. Turns are counted by the number of times the wire passes through the toroid center. Resources listed under 20 m dipole category belongs to 20M main collection, and get reviewed and rated by amateur radio operators. Coax not included. Short coax fed 42 foot long dual band 40/20 Meter dipole antenna. Of course, the 20 meter antenna is strictly a one-band affair, while the inverted vee can be used on other bands from 40 through 10 meters. Available in 20+40M and 17+30M versions Approximately 30% shorter than a full size dipole Weighs approximately 4 ounces. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E nu3e@arrl.net Abstract A coaxial-cable trap dipole antenna installed in the attic provides a surprisingly effective solution to HF operation on the 10, 15, 20, 30, 40, and 80 meter amateur bands at a QTH with restrictive covenants that prohibit outside antennas. 20 Meter Dipole at 20 feet. Handles power up to 100W of RF. Figure 5 — An antenna comparison conducted on July 3, 2018. DX-EE - “No-Trap” 40-20-15-10 meter dipole or inverted V. Also covers 30-17 & 12 meters with an antenna tuner. Use as a dipole, inverted V or upright V antenna configuration. Full-wave 20 meter dipole antenna measuring approximately 66 feet, 10.28 inches (66' 10.28"), split as approximately 33 feet, 5.14 inches (33’ 5.14”) on each side. 4. 20 Meter "Vertical Zepp Dipole" Antenna by Carl H. 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