20 meters antenna

20 meters antenna


4-Band antennas cover 40, 20, 10, and 6 meters, with no tuner required! 12 meters may also work on the 4-Band 300 watt model. Describe your experience with the Mosley mini 33 tri bander 10,15,20 meters and tell us why you give it the rating you did (required). I'm looking for an easy to construct antenna for the Backcountry. There's plenty of trees so I was thinking a wire antenna Nov 17, 2012 · Multiband Dipole: Faithful for More Than 20 Years! This is a plain-jane antenna that I have used for more than 20 years on 40, 20, and 15 meters. A few years ago, when 10 meters was open, the quad enjoyed considerable popularity. Comes complete with tuning network and fold over mount. Larry 160 meters 123 - 136 feet 80 meters 65 - 70 feet 40 meters 34. Designed with corrosion-resistant aluminum tubing, this antenna is very durable and attractive. The 20-meter or 14-MHz amateur radio band is a portion of the shortwave radio spectrum, comprising frequencies stretching from 14. which has a 24 inch face. 40. Concentrating energy is another way of saying the antenna develops gain. Five elements are active on 20 and 15 meters and all six are working on 10 meters! This is the hottest performing tribander on the market! A dual driven element (log cell) creates a rig pleasing, flat match, and broad gain & front to back curves across 10, 15, and 20m. My favorite antenna for portable use is the end fed halfwave or EFHWA. It is a simple matter to screw on the additional mast/joiner and the appropriate version of the "resonator" and whip. 5:1 or less VSWR. 00 to make. Get a strong, clear signal with less noise from 2 meters through 40 meters with your choice of single- and multi-band Yagi antennas with up to 16 elements. May 12, 2013 · The 20 meter vertical with an elevated, tuned counterpoise works very well. W5DQV adjusting the phasing stub on his 20-meter quad. The noise floor was at 0-super quiet so I figured it's because you have no 40 meter antenna dummy. CB’ers found the A99 to be a great antenna that performed better than most other antennas in it’s class. Constructed of wound fibre glass coil with a stainless steel top whip. Also Great For Limited Spaces. The classic Butternut® HF6V 6-band vertical antenna operates on 75/80, 40, 30, 20, 15 and 10 meters. I chose this length on purpose to allow the system to be tuned to resonance with an antenna runer. And hams found it to work well from 17 through 10 meters as well. The 30 meter band is pretty interesting. ) Fig. With the whip fully extended, it’s only a matter of some experimentation to find a “sweet spot” for 6 meters. (I have ignored the WARC bands for simplicity) BUT, FIRST, some basic antenna theory: Every antenna above real ground has a pattern That is affected by its height above ground By its length, and by its orientation. 19-20 Here's how to turn a 30-meter quarter-wave vertical into a 5/8-wave radiator for the 12-meter band. 50Ω coax. 20 meter Moxon Beam that covers 14 to 14. 6 feet As you can see, from this table, the length of a counterpoise can be quite long on the lower bands. On 160 meters you should see about 110 kHz bandwidth. All hardware has Of course, with a vertical element of approximately 15′ this is a non-resonant antenna for the 10, 12, 15, 17 and 20 meter bands. 3:1 or less across the 17 meter band. 9 m). The large diameter yields broadbanded coverage of the 80 Meter Band. MA5B, Cushcraft's multiband HF antenna provides 5-Band operation in a package small enough to Cushcraft R9 covers 6,10,12,15,17,20,30,40,80 Meters The 20 meter s (65. Enter the desired operating frequency in megahertz to get a good starting length for a dipole in both feet and meters. Other Ham operators use tuners and utilize this antenna for multiple bands. B. For a while I used antennas for other bands with a tuner to get on 30. My first 20 meter delta loop was mounted kind of low to the ground, but it did okay. A tuner will probably be needed for 10, 18 and 24 MHz Band operations. The 3 elements Delta Loop has a boomlenght of 5,4 meters. The A99 is a 1/2 wave over a 1/4 wave antenna for CB (11 meters). covering 80, 40, 20, 15 and 10 meters, and the other covering 80, 40, 17 Trap operation, all turns are used, in the con- ventional manner for a trap. Good 20 meters antennas are easy to build with nothing more than readily  The 20-meter or 14-MHz amateur radio band is a portion of the shortwave radio spectrum, relatively small size of antennas tuned to it (especially as compared to antennas for the 40-meter band or the 80-meter band) and its good potential  UB50 - 3 Elements Yagi 6-40 meters. ” Heyes used an antenna with a 30 ft top length about 25 ft off the ground on 40 meters and received consistently good reports from all Europe and even the USA (from England). Solve Virtually Any Restricted Space Problem - 40 Meter Isotron only 22 inches x 16 inches x 15 inches! However, you may find that your mono band delta loop may tune up on it's second harmonic at a higher frequency eg. 20 Mx Pattern 1/2 wl high 25 deg 7. Mar 19, 2016 · So, a good compromise for the new HF operator is a multiband antenna that allows operations on a couple of higher bands (perhaps 20-meters, 15-meters, and/or 10-meters), and operation on at least one lower band (perhaps 40-meters and/or 80-meters). Radioteletype is used frequently on this band as well. Pretty 20 Meter Wire Antenna Sizes. HF verticals are versatile, and can deliver both multiband and monoband performance. Watch. 38’ ½ lambda 0. 2 meters from end to end: check the listings  It is similar to a G5RV but a much better performer especially on 20 meters. Resources listed under 20 Meters antenna Plans category belongs to Antennas main collection, and get reviewed and rated by amateur radio operators. HF Ham radio Sky Loop antenna 40 20 15 and 10 meters and 2. Dipole Antenna Length Calculator. the antenna are down 10 to 20 dB from those off the front. Paolo is located on a little island in Italy He is situated only 20 meters from the sea on the East front. 1 MHZ) full-wave loop antenna will also be resonant on: 20 meters ( +/- 14. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. 110 MHz. The 4-Band antennas are OCF (off-center-fed), with a 23 foot leg and a 45 foot leg, totaling 68 feet. - 20 Meters each leg 17 ft. It would not have the gain of the doublet, but simpler to erect in field. Antenna performance and 2:1 VSWR bandwidth is site dependent and varies with height above ground and surrounding objects. Prototype # 1 was a "Dual Band" (40 -20 Meter) Parallel Dipole Antenna, each Dipole is a "Cage Dipole" SWR was BELOW 2. Nonetheless, you will be Oct 10, 2014 · The length of the radials is not critical, different sources advise a minimum length of 0. 894 swr 1. I recommend highly best antenna I have. net) This 40-10 meter portable antenna uses switches to disconnect sections of the antenna for 20-10 meter operation, and clip-on inductors to extend operation to 30- and 40-meters. 60. It has gain and wave angle comparable to a full-sized ¼λ ground plane antenna with radials . The purpose of this project is to design a simple multiband vertical dipole antenna for 20 meters and above, with a tuner, that will provide gain and a circular pattern on the higher bands. 000-14. Power Input - 1000 watts PEP** Wind Load (sq. HF Yagi, HEXX Beam and Rotatable Antennas. e. 4 MHz) The sloping loop's radiation pattern will become split in an ever increasing number of side lobes (of lesser amplitude) as you use the antenna on higher frequency bands. As a “compromise” antenna I’m pretty happy with it! The 40 Meter Isotron Antenna. In you're opinion which is the best wire antenna for 80, 40 and 20 meter ragchewing? I am using a homebrew G5RV. The Half Square antenna is a wire antenna with two vertical radiators fed in phase. Figure 7: The components of my antenna (PVC mast included, fishing poles partially collapsed) I used 2 meters of PVC tube of 4 cm diameter as a temporary mast, stuck into a heavy umbrella stand (see Fig. This might be a good design for the AMer who lives in the central part of the USA and wants to put a better signal into both coasts with a minimum of effort. 30 or 20 though). Antennas for 20 Meters Antenna: 20 meters, Range: 14. Theory said this should work 10-20 meters. I came up with an antenna that extended only 1. 65 meters or about 5 feet 4 inches above the top of the vehicle. 14 wavelengths long on 20 meters. At home, in the car, or on the road, youll be amazed at what MFJs SSB radios can do! Here is what you get We will look at the elevation plots of the antenna at 33 feet then at 66 feet For the bands 80 – 40 – 20 – 15 – 10 Meters. 5KW, 18 FT, $229. Build an HF Ham Radio Dipole Antenna It is easy to build, construct and erect a dipole antenna for the HF bands: 160, 80, 40, 20, 15, 10 metres, etc using a few simple components at a minimal cost and get great results. An extra bonus is that this antenna will work on 20, 17, 15, and 12 meters, although without the gain obtained on 10 meters (some people miss this part). Many 40 meter yagis interact with 15 meter yagis. 6 ft) Beam Iridium RST935 antenna cable provides the ability to run long distance installations for larger marine vessels and fixed installations and is pre-terminated with TNC male connectors (TNC-Male to N-Male and N- Female to N-Female). 0 m) above ground. Jose I. power handling 3kw cw,6kw ssb. The first L/C circuit generates enough reactance to bring the whole HF6V to resonance on 80 meters allowing it to act as a 1/4-wave radiator. This was created as a fun project to demonstrate how to enjoy operating HF in the field with a home-made portable antenna without spending a ton of money. Range - 14. The antenna is designed to be fed with 50 or 75 Ohm Coax Cable of most any length with a Balun. Since it is a  Under this brand name a range of efficient antennas and powerful antenna rotators is Hy-Gain AV-640 Antenne verticale 8 bandes, 6/10/12/15/17/20/30/ 40m. 000 MHz to 14. 0 to 14. Same antenna, new name. 3 Quad Antenna," QST, November. The best CB antenna for you is the  Swl Antenna Construction Projects Pdf. By John Portune W6NBC . MFJ-1022  Antenna for backpacking 20 meters. 8 ft (10. Maybe  8 over 8 fixed on Europe The primary antenna on 20 meters is a stack of 8 element Yagi antennas fixed on Europe. Petersburg using an EF-20 and FT-817 Take world class DX performance along on your next vacation or business trip -- the MFJ transceiver, microphone, power supply, and antenna can easily fit into your brief case or carry-on bag. 5 meters  4 Feb 2018 Simple Folded Dipole Antenna for the 20- meter Band: by: Vladimir E. With this vertical you get true full size performance with a low take off angle for Maximum DX performance. Also shown in Fig 1 are the radiation patterns for dipoles at 100 feet and 200 feet. To optimize the antenna for a frequency RANGE, do the calculations twice, once for the low end of the range and once for the high end; then average the two and plan to adjust the VSWR on both ends of the range as needed. 10-20 Meters The MA5B, Compact HF Multi-Band Beam Small Footprint -- Big Signal MA5B, Cushcraft’s multiband HF antenna provides 5-Band operation in a package small enough to mount to a tripod. The short stubs on each antenna are strategically sized and located to permit more flexibil- ity in adjusting the resonant frequencies of the antenna. 80 Meters We have two delta-loop antennas systems for 80 meters. When used in a multi-vertical array, verticals can even provide low-band directivity. In theory, the 20 meter loop would be a 2 wavelength loop on 10 meters and the 40 meter antenna would be a 3 wavelength antenna on 15 meters, providing 4 bands on one feedline when matched with a 4:1 balun to 52 ohm coax. Here's two new projects from the NØLX workbench. The antenna is 40 meters long, making it resonant in the 80-meter band, and is mounted about 20 meters above average ground. One is an EFHWA for 20-40 meters, and the other is a matching unit for the antenna. The larger the wire, the wider the bandwidth. 86` diameter (9`circumfrence) loop for 20 meters with spiral wrapped 3" diameter pool noodles. I chose 58' for Mid 80 Meter Operation. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters John DeGood, NU3E nu3e@arrl. com. For Super Antenna MP1DXMAX Dual HF plus 2 meter Bands SuperWhip Tripod All Band Antenna with Clamp Mount and Go Bag. 5 feet 15 meters 11. Have an antenna that's 10% efficient, then run 1KW to get the 100 watt ERP level. This calculator is designed to give the critical information of a particular beam antenna, in this case a three element Yagi, for the frequency chosen. The antenna gain is about -3 dBd on 14 MHz, or half the radiated power of a regular dipole! On 20-meters, gain of the "20 through 10 meter" transposed feed lazy-H is much less than a regular dipole. 3 feet 20 meters 17. Not having a lot of room for 40 meter beams, I decided to use the space I do have, which is a long wooded fence in the backyard. This may not be the pattern we would associate with a big-gun DX antenna but is does provide some operational advantages over a simple dipole. Nisaea 65FT SMA Antenna Adapter Male to Female with Connecting Line 20 Meters RG58 Coaxial Cable SMA Male to SMA Female Car Radio Video Antenna Extension Coax Cable Pure Copper 3. 14. 5 feet long) with high quality components used throughout. The antenna is fed straight from the coax without a balun or choke. I would like to try this as a folded dipole at 20’, no tuner, raised ends. Loaded Quarter Wave Antenna Inductance Calculator The original javascript was created by Jack Ponton and can be seen here . Dipole Antenna Calculator. ANTENTOP- 01- 2013 # 017 Helical Antenna for the 20- meter Band Igor Grigorov, va3znw The described below Helical Antenna for the 20- meter band has small sizes, as well it is very easy to tune and moreover the antenna has high performance at the band. The Wire Size 20 Meters. January 1955 of amateurs. Although this design has been around for a long time, it is only gaining popularity now due to the recent improvement in high power antenna tuners. 1948, p. Evolving from a simple end-fed Marconi for 80m, this antenna design was created by Mike G7FEK (reproduced with consent ). Frequency range: 7 - 50 Mhz; 3 elements yagi: 6-10-12-15-17-20m; 1 element folded dipole: 30-40m; Gain (dBd): 6,1; Gain   ANTENNAS --> 20 METER. I was reviewing the model of a recent OptiBeam commercial antenna which used a Moxon rectangle on 20 meters and a loaded Moxon for 40 meters. 96 x . For our 15 and 20m verticals we applied 16 radials for each antenna, each radial being about 6 meters long. My apologies to Harry. MFJ-1835 Cobweb 20/17/15/12/10m SPECIAL: MFJ-1622, MFJ-1625 Window/Balcony Antenna 80-6 Meters : MP Antennas: Super-M 400 Base Base Antenna 400-500 MHz: Super-M Classic Base Base Antenna 25-1300 MHz: Super-M Ultra Base Base Antenna 25-6000 MHz: Solarcon: A99 Vertical 10-17 Meters DISCONTINUED: Surmen: SX- 3 Vertical 2M/440 : SX- 5 Vertical 2M Whereas a height of 50-60 feet may seem high above ground, it's very low in terms of wavelength at the lower frequencies. 48. 20  The Thunderpole Am Pro 20 Meter antenna. Tokarev, UA4HAZ. If an antenna works on 40 it should work on 15 as well. Also covers 30-17 & 12 meters with an antenna tuner. ian, Louie/4F1AAZ, who passed away many years ago. 8 feet 10 meters 8. A little trimming would help reduce the SWR even further. 75 MHz: (click to view full-size version) 20 Meter Loop • My next attempt was a 2. Twenty meters designates the length of the particular radio wave used to transmit and receive voice and Morse code. 5KW, 13 FT*, $169. This makes the 2 Meter Slim Jim antenna a great solution for repeater sites, data and packet stations, APRS, and even every day Back-Up Antenna for 80-20 Meters An EDZ' built for 20 meters is about 85' long. € 79,00 boomlente 4,84 meter. 5 lambda 1. The antenna is bi-directional with very little radiation off the ends making it suitable for use with a rotor. " I live in an 20 meters. Eventually at an angle of 90° the radials will combine and the ground plane antenna becomes an vertical dipole and exhibits an impedance of 75 Ω. 5 dBi . 160 m loop on 80, 80 m loop on 40, 20 m loop on 10, etc. 6 ft) Beam Iridium RST935 antenna cable provides the ability to run long distance installations for larger marine vessels and fixed  Download scientific diagram | Radiation patterns for a dipole antenna operating at 300 MHz, 20 meters above different ground structures from publication:  End Fed Antenna. 30 Meter Vertical Antenna . 43, 16. A 20 Meter Half Square Antenna for QRP Portable Operation by Mike Bray, K8DDB I’ve always enjoyed tinkering with wire antennas with the hope of finding a magic configuration that was easy to erect and also made good use of the meager power from my QRP rig. 350 Mc. . Running 100 watts yesterday and today enabled me to work a bunch of Europeans and South Americans on 20 and 40 meters with 100 watts. , tune) by simply adjusting the length of the tubular elements. Dipoles antennas are easy to build and can be very effective when placed half a wavelenth or more above ground. mounted on a 150 ft tower. As seen on his page, the original formula seems to come from an article by J. a 40m high air dome serves as   ANTENNAS --> 20 METER. The measurements below are for building a simple Dipole Antenna. The remainder of the antenna consists of two top-hat wires that add capacitive loading on 160 and 80 meters. 1 at 7. With twice the gain of a standard J-Pole antenna, the 2 meter Slim Jim antenna is a J-Pole on steroids! The Slim is an end-fed folded dipole antenna that has a gain of 6 dbi and a nice low RF take off angle. 200, 32. * Impedance - 50-75 ohms Freq. 6 m); the height difference between its top and bottom is 26. No need for a tower, rotor, and beam to get rare DX or be competitive. So in this case, we want to build an antenna for 6 meters, 50. Build Stealth Antennas. 1. For 20-meters, you will find that only the top turn of the coil is necessary for resonance. 00; Description: The 5/8 wave 20 meter vertical is a 40 to 43 foot long antenna hand made from heavy duty t-832 tubing. The video does a good job of explaining the theory, construction, and operation of this magnetic loop antenna variation. I wanted high efficiency 40 Meter antenna with low-angle radiation. It will supplement the big horizontal dipole by providing good omnidirectional coverage, with some gain, from 20 through 6 meters. My first contact to Australia was on my 20 meter loop, so it has to be working great. Place a 1:1 Balun on the Antenna end of the Feedline. Directivity: Omni-Directional. This is the only use of traps in the antenna, and I’ve made every effort to minimize their loss. HORIZONTAL LOOP ANTENNA CONSTRUCTION . 2 ft (8. 06 feet. For 17, 15, 12 and 10 meters, you will need to short out the entire loading coil and then adjust the whip for resonance. below 10 degrees. 3 MHz) 10 meters ( +/- 28. Plans for a 20 Meter Yagi Antenna category is a curation of 17 web resources on , Monoband Yagi for 20 meters, 2 Element Yagi, 2-Element-Yagis for HF. 13 $ 17 . 75 lambda Folded dipole lengths shorter Dec 30, 2016 · Construction The antenna is made with two parallel dipole elements, 7. As erected in 2007 January, the center is 20 ft (6. A dipole design for the 20-meter band is an efficient and inexpensive antenna for the novice and veteran ham enthusiast alike. Kevin Loughin (KB9RLW) calls his creating a "spiral loop antenna" for 20 meters. The tuning of this antenna was very straightforward; I simply tuned the main element for the center of the 40 meter band and then adjusted the 20 meter stub for the center of the 20 meter band. 3m long, and 2. So, sea all around. The antenna boom is made of the same material: 2 sections of 135 cm (4 ft 5") in length (cut from a standard 3 m section). Dimension "A" is the height of the antenna from the base to the apex, not the length of each of the vertical wires. Operated by AMSAT-DL in cooperation with Sternwarte Bochum; Diameter: 20m, Weight: 140t. I currently use only wire antennas which work fine on 40 and 80 meters, but on the higher Bands, I need some gain. Delta Loop is a three-sided antenna suspended high in the air by vertical supports, such as tall evergreen trees. 95. 00 shipping. It was really neat to be able to steer an antenna on 75 meters! This might be a good design for the AMer who lives in the central part of the USA and wants to put a better signal into both coasts with a minimum of effort. 20 Meter Wire Antennas. 1 over entire band 40 meters swr 1. mounted on a 150 ft tower . Specifications: • Full band coverage on 20 or 17 or 15 or 12 or 10 meters with SWR under 1. The SE-20M can be also be setup for 17 Meter operation by resetting the reflector and element spacer settings with an VSWR of 1. 2 MHz) 15 meters ( +/- 21. HF STICK, 20 METERS 3/8-24, WITH WHIP, MOBILE ANTENNA. Cebick's web site, I thought a 4-element colinear wire antenna might be useful for my station. Remember, the ideal loop is a perfect circle - it's not too hard to make an 8-sided loop for 20 meters using PVC pipe and some dacron rope to hold it rigid. So I threw together a 20m ground plane and it did well for what it was, but if you’re used to a directional antenna it’s really hard to be without one, particularly on 20 meters. 80-40-20 M dipole 80 40 20 Meter Dipole Array By KJ4EX October 2008 Recently I have installed three of these systems, all untuned, requiring the use of a tuner, but capable of operating on 80 through 6 meters. 5 pounds), they are ideal for portable work. After looking at articles in the ARRL Antenna Book and on L. Overall length is 40 ft. 0 with 1. The all black construction makes them difficult to see. It has a integrated boom of three inch and two inch tubular aluminum. Conceptually, the multi- band quad is a simple antenna, with separate driven and reflector loops for each band. 9 below). This kind of antenna is fairly simple technically -- the big loop forms an inductor and a capacitor selected to resonate the inductance at the operating frequency is connected across the open gap where the ends (almost) meet. It may sound and look like a G5RV but it is a substantially different antenna on 20 meters. Antenna for backpacking 20 meters. This has 4 x sloping radials at 45 degrees with a feedpojnt up at about 7 meters in the air. Compact built and light-weight 3-band antenna for 10, 15 and 20m. 4 meters, 3. The Wire Size can range from 16 AWG to 12 AWG. good match on 40 meters with the shorter antenna height resulted in having too much net inductive reactance in the L1/C2 se-ries combination for a satisfactory match on 20 meters. 1 over entire band 20 meters swr 1. 20 Meter Antenna. Learn how to construct a great 20 metre delta loop for your suburban house by Building an effective HF antenna can be difficult when space is limited. There's plenty of trees so I was thinking a wire  20 Meter Antennas. The article also suggested using wider spacing with transposed feed. This antenna is 58 ft tall and is mounted on a hinged base. It works great. Here is how I managed to get pretty decent results with a homemade antenna. The length of a full-wave antenna is given by the formula 1005 / frequency in MHz = total length of the loop. It shall be easy to adjust (i . The idea was to use the opposing harmonic A dipole a quarter wavelength above ground provides mostly high angle radiation without that null. 3 swr at either end of the band 80 meters at 3. The designer of this antenna, W1FV, describes the details in a four page writeup. High Performance 40 Meters Vertical . On 80 meters, a pair of parallel-resonant traps disconnect some of the 160-meter top hat to provide appropriate loading. Amatuer Ham Radio Antennas . The Power rating is a conservative 100 watts. I therefore expected reasonable performance in regard to antenna losses and pattern. It was designed for the 20 meter band and works well on DX! Review Summary For : ZeroFive Antennas 20 Meter 5/8 wave vertical; Reviews: 8 MSRP: 299. I was able to work west coast stateside stations on 75/80 meters, and I was able to work one station in Alaska. General. This shortened easy-to-build vertical, with no-radials, is made from surplus military camouflage poles. 2m” may not actually be 7. 3 (1. 6 feet 12 meters 9. Click on Calculate and the optimum length for that frequency will be displayed in meters, feet, and inches. In the case of the five-band, 20- through 10-meter quad, the driven and On 75 and 80 meters, you should have about a 220 kHz bandwidth. Let’s see on the schematic of the Antenna (Figure 1A). Enter the desired frequency then click on Calculate and the optimum values for that combination will be displayed in feet, inches and fractions of inches, and in meters. 5 for the FULL BAND on 20 meters. 0 m); and the longest wire is 35. For DX work on 80 meters, the desirable radiation angles are generally between 10⋅ and 20 ⋅. At 10. This amateur radio dipole antenna is of the highest quality and will last a lifetime! 20 meter yagi - Antennas: 20M: 20 meter Yagi antennas. A full-size ( = ½λ) dipole antenna for the 20 mtr band spans about 10 meters (33 ft). Pour la version 40/20/10m de l'antenne la self doit avoir une valeur de 34µH sur les descriptions de sites ci (j'ai coupé une spire de trop), mesure faite à l'aide d'un L-C mètre DF1SR, à défaut d'avoir un UTFWTB. The VE2DPE 160 Special! The SuperLoop 40™ is a high performance, full size, full-wave, 40 meter loop antenna. AND – This is only 17 feet off the ground for 20 meters, 8. Feb 18, 2019 · So I don't have alot of time in the hobby. at 1. The S-33 is capable of  Stationary antennas: GAP Titan DX vertical for 80 - 10 m band operation and a 25 m long thin-wire "invisible" end-feed longwire. It will not perform as well at 40 meters as at 20 meters, however, though 10 through 20 meters should be Aug 20, 2017 · Now a side-note to prove that one sort of misunderstanding can lead to a different sort of understanding. 6 Element Yagi 6-20 Meters DX. Choose from top-brand HF Yagi, HEXX beam, and other rotatable antennas to meet your high-frequency needs. I have documented some of the earlier ones I built in my pedestrian mobile pages. The versions using multiple masts can be installed when the vehicle is parked to increase efficiency of the mobile antenna system on 15,17 and 20 meters. At 200 feet the pattern is great, but lower-ing the antenna to 100 feet reduces radia-tion at the desired angles significantly. On the 10-meter band, the usable bandwidth is about 500 kHz on either side of resonance before the SWR becomes excessive. ed, 75/80 meters was very difficult. 5 to 1. Any antenna tuned for 80 Meters should also work on 20 and 10 meters as well. 1005 / 50. 35 MHz you can use a few algebraic formulas to compute antenna sizes. An in-line balun takes care of potential feedline unbalance and radiation problems. The narrowing of the lobes concentrates the energy radiated by the antenna. 5:1 • No Tuner needed • Bandwidth: Over 750 kHz Ham Radio antenna that needs no trimming and covers 40 Meters, 20 Meters, 10 Meters, and 6 Meters with SWR Less Than 3 to 1. 01 x . 71. 20 Meter Wonder Bar antenna (not drawn to scale) You are now the proud owner of a Comtek 20 Meter Vertical Antenna. 25 lambda 0. The main supports are bamboo fishing poles. 20 M SWR Curve . most backyard antennas, the average ham is lucky to achieve an antenna height of 1 wavelength on 10 meters, while the truly fortunate operator may get his wire to 1 wavelength on 17 or 20 meters. Nov 07, 2007 · My friend Jerrie - KD5KD has been using an antenna like this with great success on his Navy MARS net which is near the 80 meter band. 20 Meter 5 element Yagi at 150 ft. 7 ft (20. tion projects, and would like an antenna that performs well on all five bands from 20 through 10 meters, then this is the project for you. Use as a dipole, inverted V or upright V antenna configuration. Sep 24, 2017 · NOTE: SM0VPO is not Richard. The NE/SW system has two elements with apex at 92 meters, above two elements with apex at 46 meters. 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. 8 dB lower – Much less SWR bandwidth – Greater feedline loss away from resonance Build or Buy a Short Dipole? • Designing a Shortened Antenna CT1EOJ QST Oct 2003 • Model it in NEC – Tweak the design for multiband coverage • Buy from Barry, KU3X, Hypower Antenna TWO ELEMENT PHASED VERTICAL SYSTEM "Christman Phasing" by W4NFR 5-22-2011 I have always been curious about vertical antennas and how to make them efficient. 2a - 80-m Horizontal Dipole Antenna at 3. 20 or 17 meter 1/4 wave monoband freestanding vertical antenna The Zerofive 20 or 17 meter monoband vertical is a freestanding high performance antenna. 4 swr at 4. On the other hand, lowering the antenna is likely to raise angles on 40, 30 and 20 meters, which makes the antenna a little less of a DX antenna. 5: 1Length  Antennas for 20 Meters. Resources listed under 20 meter yagi category belongs to 20M main collection, and get reviewed and rated by amateur radio operators. DROOP ANGLE The graph on the right shows the effect of an increasing angle of droop. Antenna: 20 meters, Range: 14. feet) - . This is relatively easy to achieve on, say, 20 meters (35 feet). Front to back was 20 to 24 dB. 7, depending on what portion of 20 meters is being used. On these bands, the antenna will be a quarter-wave long. 2 elements HB9CV. Antennas are at 150 feet and 75 feet with  The S-33 is a beam which will give you great performance on 17, 20, & 40 meters without have an antenna size that's TOO BIG to handle. 19, 16. € 99,00. Boom length, 1. Since 20 meters covers the frequency range of 14. boomlengte 1,6 meter. On 20 meters the SuperLoop 40™ coverts itself into a 2 wavelength open loop or Bi-Square. The Horizontal Loop, also known as the Loop Skywire Antenna, is an old but very effective design. boomlengte 0,8 meter. Any lowering of the dipole antenna below 1/8 wavelength does not help short range communications, since ground loss increases. The SWR is really low. 110 = 20. 5 to1 balun hang-n-go. AV- 14AVQ, HF VERTICAL, 4-BAND, 10/15/20/40M, 1. The extra wires on this tower are for a wire log antenna. I use the antenna with a LDG RT-600 remote tuner hidden adjacent to the flagpole. An ideal horizontal antenna height for working distant stations is ½ λ or greater above ground. In some circles, a dipole antenna doesn’t get a lot of respect. Big 2 1/8 inch bottom section tapers to 1/2 inch at the top. The antenna is rated to handle 125 Watts continuous and 1,500 watts PEP. It's also easier to make a 23' diameter loop for 20 meters more circular instead of square shaped. The new ruggedized version of the MP1 SUPER ANTENNA, 2 METER ADAPTER, TRIPOD, UNIVERSAL MOUNT, TITANIUM SUPER-WHIP, 80 & 60 A 14 meters ( 46 ft ) multi band antenna for small gardens that works well on 80 meters Main bands (@~50 ohm) are 80m / 40m / 20/ 30m / 17m / 15m / 12m . I'm a happy ham. Without Radials . Calderon (DU1ANV) Makiling Amateur Radio Society (MARS) [This article is dedicated to our fellow MARS’. Looking back in the log, on September 14 the 4-square was 3 S-units louder than the 80-ft-high dipole. 100, 33. Product ID, Product Description, Retail Price. May 28, 2016 · Continuing our NEC Shootout between the 43 foot vertical available from DX Engineering or Zero Five and the adjustable height BigIR antenna available from SteppIR antennas we now analyze them in the 20 meter band. He loved working 20 meters, but the housing community he moved into prohibited antennas that could be seen by the public. The MA5B is a design that does not sacrifice ruggedness, performance and power handling for size and ease of installation. I've wanted to try out a spiral loop for awhile. Manually trimming and tuning the elements to resonant frequencies on the bands they are cut for antenna’s overall width is 68. Notice the difference in the pattern of this antenna and the curve for the dipole in figure 2. Construct a compact, 20 meter rotatable dipole antenna of durable weather worthy components supported at a single point obviating the need for multiple supports and multiple support ropes crossing the yard. 00. Add Review × 10 meters swr 1. 3 wavelength. The Antenna is 68 and one-half foot long (one side is 23 feet long and the other is 45. And there’s a bonus: you can use the same approach to use your quarter-wave 40-meter vertical as a 5/8-wave antenna on Details about MFJ-1620T, 20 Meter Hamstick Antenna 250 Watts, 3/8 X 24 Threads, Mobile or Base. (I wouldn’t be surprised to discover a Review Summary For : ZeroFive Antennas 20 Meter 5/8 wave vertical; Reviews: 8 MSRP: 299. THIS IS: The maximum Super Antenna Go Bag setup with All HF Bands 80m-10m and simultaneous VHF 2 meters. 100 sold. 1 out of 5 stars 4 $17. I loosely followed Frank, N4SPP's notes on his page linked below. 7λ. The antenna is broad banded enough that you can use it on 10 meters and I have heard of some dedicated 10 meter operators chopping off a small amount of the top section to shorten the antenna for 10 meter use to achieve a better SWR. 4 swr at 3. Jul 23, 2010 · The original antenna was designed as a moderately short antenna for the 10 meter band. This is a portable dipole I built for 20 meters. Portable a. Effect of the paired radials . 4 meters. ○ marginal DX paths require very low elevation angles well below 5 degrees. It performs well and excellent on 20 meters but I noticed my 20 meter aluminum dipole seemed to get a better signal on 20 than does my G5RV. 800 and 1. A 3 kW 4:1 balun efficiently matches the antenna to 50 W. 350 Mhz. Jan 20, 2013 · 20m Elevated Vertical Antenna – G8ODE. I plan to raise the antenna by several meters this summer. The "driven element" of such antennas is a dipole. Formula for length of full wave loop Isotron Antennas 20 Meter Isotron Antenna [ISO-20] - Size (H x W x D} - 21" x 8" x 4" Bandwidth - 350 Khz. The antenna is almost a quarter-wave long on 20 meters. Nov 08, 2016 · This antenna is a full size 40 meter half-wave with a tuning stub in the center to adjust the resonance of the antenna as a 20 meter full-wave. The antenna as designed is a broad band antenna with the coaxial cable's capacitive reactance changing to compensate for changes in inductive reactance across the band of operation. Dimension "B" is the length of antenna wire called the base (width) of the antenna. Antenna type: Whip 1 / 4λ (quarter wave)Frequency band: 14Mhz (20 meters) Maximum power: 220 Watts SSBImpedance: 50 ohmsSWR: Less than 1. Product ID, Product 1. The Half Square antenna is a great wire antenna for the DX edge. It's an 1/8 wave vertical on 160 meters also. 285 with less than 1. I used a 50pf vacuum variable. What’s going on here? A couple things are happening. This is over 10,000 miles. He’s Harry Lythall. It's one feed line eliminates the need for multiple antennas to cover the HF bands. ○ 20 meters - a very crowded, very competitive daytime band. The Pacific Antenna Dual Band Trap Dipole kit provides a lightweight, portable trap dipole. The Isotron Antenna. The antenna was designed for limited space. 35 MHz Good 20 meters antennas are easy to build with nothing more than readily available materials. It will do just fin All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. That's what I wanted and expected and that's what I got. Every horizontal antenna is subject to essentially the same general phenomena that affect horizontal dipoles in terms of their height above ground. Aug 22, 2013 · On 17 meters a 20 meters delta loop is longer than 1λ, while on 30 meters it is over 0. So I guess this means that if I wanted a loaded 20 meter Inverted-L that I could use the calculation for a 40 meter dipole. Many amateurs reported that it gave them re- Nov 07, 2010 · A Co-ax Trap Dipole For 40, 30 and 20 Meters – Or At Least That Was The Intention. Available in 20+40M and 17+30M versions Approximately 30% shorter than a full size dipole Weighs approximately 4 ounces. This started out being a stelth antenna for a friend. Actually it is quite simple: just take a random length A simple dipole, 2 x 20 meters, proved to be the best system here. 7 dBi. It's 0. DX-EE - “No-Trap” 40-20-15-10 meter dipole or inverted V. Jerrie has his antenna mounted as an inverted V with the center at about 38 feet and the ends drooping down to around 20 feet off the ground. Nov 15, 2017 · Here's another clever magnetic loop antenna for radio amateurs unable to erect antennas because of CC&R and HOA restrictions. The SE/NW system has two elements with apex at 58 meters. See videos: Mountain Topping with the EndFedz; See Oleg, RD1AN operate portable outside St. Frank's N4SPP Ham Radio home-built 80 40 20 meters short dipole antenna KGD kurz geratener dipol More information Find this Pin and more on Ham Radio - Antennas by Jim Shields . (The charts show relative gain patterns drawn with respect to Gmax. And that’s all there is to it! This is a great first 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. Yes, I’ve had lightning hit an antenna and yes I had to repair some damage. Could this be the lightest HF vertical in the world? Simple 5/8-Wave Vertical for 12 and 17 Meters QST April 1989, pp. Items 1 - 20 of 43 1 MHz, it is between the 40 and 20 meter bands. 350 MHz. 20 Meter "Vertical Zepp Dipole" Antenna by Carl H. 060 Mhz 41. As I promised in my final look at the recently-retired 20 meters delta loop, I am following up with my observations of the antenna's performance on both these other Amateur Mobile Antennas The The S-F 5S is a set of five HF antennas for 10-15-20-40-75 Meters bundled in Each antenna features a black fiberglass lower length long, the antenna will still be an effective radiator. The 20-meter band is widely considered among the best for long-distance communication (), and is one of the most popular—and crowded—during contests. HF Vertical Antennas and Packages. Hall, “Off-center loaded dipole antennas”, QST Sept 1974, 28-34. Such is the case of the cubical quad antenna. 100 MHz and a 6-40 meters Ultra Beam antenna. Good dipole antenna 12th Oct 2015 I love it, made contacts in several us states, on 40 meters and 20 meters easy to install, so small you have to really look for it. 23 Wind Rating - 85 Pattern - Omni * Bandwidth is within 2:1 SWR. 5 feet 30 meters 24. DX-LB Low Band Dipole Covers 160-80-40 meters with an overall length of only 100 ft. The 40 meter (7. The antenna has a maximum gain (Gmax) of 5. This is a very simple antenna to build. $110. These four antennas are. My SWR testing on the second harmonics showed RF and SWR needles swinging up and down together which usually isn't a good indication of an efficient antenna. Figure I shows the configuration of the The G5RV Antenna System -- An Analysis 3D pattern 20 meters Antenna in the Y axis . G5RV Tidbits In the summer of 2010, I decided to construct a 1/4 wave 80 meter vertical using 3" OD Aluminum Tubing. A vertical HF antenna offers many advantages—an omnidirectional signal collector and easy to install radiator are two of the biggest. The skill part comes into play when it comes down to building antennas that will be sturdy and will perform optimally for the frequency/band desired. Without the Drake MN-4 in the antenna system, the SWR ranges from 1. THEORY. 20 Meter Antennas . 83’ 3/8 lambda 40 METERS = 65. This antenna may be built as a 20 meter, 17 meter, 15 meter, 12 meter or 10 meter monoband vertical antenna. On 6 meters, the antenna is much too long to tune as a 1/4-λ radiator, but not too long to tune up nicely as a 1/2-λ radiator. 20 meters band antennas category is a curation of 101 web resources on , Bicycle Rim Antenna for 20 Metres, Multiband Cubical Quads, Monoband Yagi for 20  Results 1 - 48 of 64 Get the best deals on 20 Meter Antenna when you shop the largest online selection at eBay. This is a 20 meter homebrewed 5 element monoband yagi on a 46 foot boom. All readings were taken with a Array Solutions AIM-1470b Antenna Analyzer Oct 24, 2017 · On 40 and 20 meters, the antenna maintains a fairly consistent SWR of less than 2:1 (see Fig. The 20 meter s (65. gain 4,2 dBd, F/B 20 dB. 000, 33. Of course, at 160 meters, 125 feet is a quarter wavelength, and such a tower structure is beyond my reach financially. 35 MHz[ force_space]. Since the sides of the square are equal, this means the finished antenna is approximately 5 feet square. 6m apart. Building an amateur radio antenna for 160 meters is a challenge. I would not recommend this for permanent use just because it is not build like a rock. that the measurements have been made on a full-size 40-meter monoband resonant on 7. Building stealth antennas to keep prying eyes from detecting your communications resources takes some skill and a lot of ingenuity. The stub in the top leg of the antenna opens the loop when operating on 20 meters and selected other bands. 40-10 Meter Portable dipole Phil Salas – AD5X (ad5x@arrl. Tuning The 20 meter vertical loop antenna will get you around the world if the conditions allow it. Propagation-wise it more closely resembles the 40 meter band. 16’ ¼ lambda 60 METERS = 62. An Attic Coaxial-Cable Trap Dipole for 10, 15, 20, 30, 40, and 80 Meters 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. Handles power up to 100W of RF. i1 i2 i3. Conversely, reducing the amount of inductance that provided a good match on 20 meters did not afford enough inductance for an acceptable match on the lower frequency. This new big brother antenna was named the I-MAX 2000 for it’s performance values. Super Antenna SW1 SuperWhip is a  gain 6,2 dBd, F/B 20 dB. The A element is for 40 meters (and 15 as the third harmonic), while the B element is cut for and works fine on 20 meters. The dipoles are fed in the centre, on the boom, and are fed out of phase. May 28, 2016 · ~ 1 dBi @ 16° for 20 meters – nice low angle ~ 0 dBi @ 25° for 40 meters ~ -2 dBi @ 29° for 80 meters – this is quite functional ~ -8 dBi @ 23° for 160 meters – lossy, but it does work; Several things are apparent: The antenna has “better than nothing at all” performance on 160 meters and is certainly interesting for this 20 meter quarter-wave vertical antenna experiment Not content with attempting to understand and build 40 and 80 meter verticals, I’ve decided to build a 20 meter version tonight. Dahlberg N7AGK Editors note: The author of this project arrived at these plans by experimentation so this antenna should be considered an experimental project by the builder. Free shipping on many items | Browse your  This 20 meter Wonder Bar antenna project is based on the work by W5ECP and uses portions of his article, re-edited, and was published in QST, 1957. 13 20 meters band antennas category is a curation of 101 web resources on , Bicycle Rim Antenna for 20 Metres, Multiband Cubical Quads, Monoband Yagi for 20 meters. 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. This antenna system is on the 80M tower. This helps to provide acceptable matches on frequencies other than what the antenna was specifically designed for. The extra wires on this tower are for a wire log antenna . On 20 through 10 meters, the antenna is 1/4-λ long. 2), while on 15 meters, the curve is flatter with hardly any change in SWR from the low end to the high end of the band. Last night I fired up my little yaesu 450D when everything was dead in 20 meters, I decided to see just what was there on 40 m band. Here’s an easily transportable vertical antenna for 20 meters collapsible to 4 feet that costs about $2. The W5GI Multi-band Mystery Antenna is a fundamentally a collinear antenna comprising three half waves in-phase on 20 meters with a half-wave 20 meter line transformer. Other useful information would include your experience with similar products, infomation on a product that you would purchase instead of this one, and so on. He squeezed-in all possible efforts into his retiring years to dedicate his time in amateur radio. 5 feet for 10 meters. 96, 16. The antenna tunes easily on 80 through 6 meters. Oh…you can use the 40-meter dipole on 15-meters without modification. 586 Mhz 3rd Harmonic Halfwave in space is: 34. 3 feet 17 meters 13. Recommended height is 40 feet or more at highest point, but higher is better. 25 meters to the North and about 3 km from the Sea to the west. $12. A pair of wires connect the antennas together, the left-hand side of one antenna being connected to the right-hand side of the other, and the same on the other side. • 80 Meters – No significant difference in pattern – Gain about 0. 45 coax|30 Nov 20, 2012 · Homebrew 20 Meter Dipole Antenna -- Home Depot / Lowes Part 3 - AF5DN MeOnTech. 1 MHz, it is between the 40 and 20 meter bands. On 20 meters, this antenna shows negative gain over a dipole. Long story short, I decided a lightweight, monoband fixed yagi may just work. As you see, the antenna is a sloping, center-fed, doublet. 99 feet 23. Lightweight (the 20 meter version is only 0. I have a 20 meter only inverted V in my backyard. In fact, you can even add 6 and 2 meters if you like! This antenna is inexpensive, easy to build and will give you a solid signal that will be well heard! Nested Loop Antennas - Nested Delta Loops Without Any PVC Support! The three, nested delta loops for 20, 15 and 10 meters hang beautifully with one overhead support and just one guy on each Model QCB-1 Ultra-Minature CB Quad Antenna MQ-26 Hybrid Quad Compact 2 element 6 bands 20,17,15,12,10 and 6 meters with tuner B-246 Compact 2 element 6 bands 40,20,17,15,10,6 and 12 meters with a tuner September ‘95, when the new 4-square on 80 meters was being compared to a dipole. About 3 dB less gain Element Length, 3. 9 Jul 2018 A Portable 20/30/40m Vertical Antenna Be aware, a pole called “7. I originally wanted an antenna that would not hit everything overhead while driving, since it was to be installed on a van. 000 Power Rating 2kw Antenna Lengths 10 Meters each leg 9 ft. The antenna is only 23 feet tall, so the fact that the antenna loads up well and is broadbanded on this band is an accomplishment in itself. MFJ- 1020C, ANTENNA, SWL INDOOR ACTIVE ANTENNA, $119. 1 at lowest point), for ALMOST the FULL BAND on 40 Meters, and under 1. Homebrew 20 Meter Dipole Antenna -- Home Depot / Lowes Part 2 - AF5DN - Duration: 16:17. 20 Meter CW Center Frequency: 14. Sure, dipoles are great starter antennas - easy to build, very stealthy and inexpensive, but there’s a perception some folks hold that dipoles for bands 20 meters and up just don’t quite cut it for contesting and DX. The antenna has a maximum height of 11 meters. When the antenna is erected and the ground plane is in place, grab your antenna analyzer or VNA. If you have seen the 10 Meter Wonderbar project on this web site, then as a comparison of size, the 20 meter Wonderbar, is about 2 times larger overall. The antenna also seemed "quiet. An optimized shape real Bi-Square antenna has 2 dBd gain For 40, 30, 20 and 15 Meters. Mounting the antenna higher will likely decrease the angle of incidence on 30 and 40 meters, making the antenna more of a DX antenna on those bands. 75 METERS = 57. 20 meters antenna