Vertical Antenna Without Radials

The DX Flagpole Antenna is an HOA approved, NO Radial, Stealth vertical antenna - a smarter, stronger, and more elegant all band option. The braided wire which forms the outside conductor of the coax is soldered to all four radial wires. The DX-88 offers coverage of all the HF amateur bands. You may construct your own radial system from. ButI did exactly what you're talking about doing. Each radial is going to carry very little RF current. 80m Vertical - High voltage elevated radials RF Weld - Click to zoom The M0XXT Double Xray Firm had one of our outings again last weekend with myself, Tim (M0URX) and James (YOMsoft author). This vertical antenna has no lossy traps or coils to burn out. Now, I've come up with a longer, lighter and more compact (when disassembled) antenna that is easier to build, and easier to find parts for. Radials were not a consideration as I have had several verticals and they all seemed to work best with radials under them, despite the advertising that a couple of them required no radials. A mobile CB antenna uses the car body as the ground. Of course thats not only the antenna but the propagation as well. Installation 5BTV ground mounted with radials About a year ago I decided to install my 5BTV in a ground mounted with radials configuration. Vertical Antenna Ground Systems At HF Rudy Severns N6LF Introduction A key factor in determining the radiation efficiency of verticals is the power loss in the soil around 1 the antenna. The salesman said so also. The only thing I changed was the antenna height and the radial length. I had already tried the remote tuner on the long wire antenna, and was somewhat surprised that it failed to tune the vertical. For short, a simple vertical 8-m long (26. Of particular interest was how much was actually to gained as the radial numbers were made larger and the point of vanishing returns. Hustler 4BTV 4-band HF vertical antenna 4-band, trap vertical antennas that provide an omni-directional pattern. In its nested configuration it is only 60" long and weighs in at 4. Drive it into the ground, leaving 18 in. the heights required by horizontal antennas for working DX is effectively beyond the reach of most hams. Variable Radiator and Radial Length at a constant Displacement. The counterpoise is off the ground only about 5 feet so the antenna is still ground mounted. Radials, ground rod, counterpoise, something. Another advantage is that it can be placed where there is no good ground or at the edge of your lawn so you can cut your grass without thinking of radials on ground. Radiation straight up is to be minimized. Joe Everheart N2CX can probably best described as a “QRP Guru”. This antenna has been reviewed elsewhere and reviewers seem split between those who find that this antenna performs well and those who feel this antenna is useless. Hustler 4BTV 4-band HF vertical antenna is a 4-band, trap vertical antennas that provide an omni-directional pattern. Harris' FMD-(X) is a directional dual polarized FM antenna de-signed for pole mounting. For optimal performance, radial wires should be used. By using the very flexible and coated solid. 5-57 MHz (claimed voltage standing wave ratio less than 1. The Comet CHA-250B is a newly designed broadband vertical requiring NO GROUND RADIALS. A transmitting antenna for a magnetic resonance device includes a plurality of antenna conductors arranged spaced from one another circumferentially around a center line and extending parallel to the center line, and a screening element extending parallel to the center line and circumferentially encompassing the antenna conductors. The R8 is the first multiband vertical designed for the rigors of contemporary operating conditions. Without question, earth-contact radial systems require more wire than proper elevated systems for the same single-band RF performance. Typically, a quarter-wave vertical is fed by directly connecting the coaxial feed line to the base of the antenna. Manufacturer of Wireless Accessories - Apparatus - Networks - Digital - Voice Transmission - Reception - Voice - Image - Data Communication Apparatus - CW SSB FT All Modes - HF Portable - Mobile - Telephone. Vertical antennas can be very effective in long range communication due to low take off angle of electromagnet waves (for reception and transmission), can be installed in a small area for stealth purposes, yet they can also be hard to match and may exhibit higher noise levels than horizontally polarized antennas. How much of a change can I expect if I increase the height from 25 feet to 45 feet? 6. It has gain and wave angle comparable to a full-sized ¼λ ground plane antenna with radials By John Portune W6NBC I wanted high efficiency 40 Meter antenna with low-angle radiation. Vertical antennas are very popular for HF operation because they fit in well to a small garden. Butternut HF9V Vertical as a Ham Radio ALE Antenna Benefits to the ham radio ALE operator: No tuner needed. There are two types, those that are best installed at ground level and those that can be installed on top of a mast. The 4-BTV is designed as a self-supporting vertical to provide optimum operation in the 10,15, 20 and 40 meter bands. The radials should always be the same length, but I have found that you can vary them about,. the heights required by horizontal antennas for working DX is effectively beyond the reach of most hams. The Butternut HF9V Vertical as a Ham Radio ALE Antenna. Find out why Close. A tuner can be used for minor frequency excursions, but coax losses are too great to take it to the other half of the band. It weighs just 20 See more. Radials can be rather small diameter wire since so many of them exist to share the return currents and they are in parallel with the ground currents in the earth as well. 920 MHz range, which is VERY good for such a short antenna. This is a misconception based on elevated or ground plane type elements. 87 25 Foot 5 Band HF Vertical "The Wonder Stick" A good working hf vertical for the price of a hamburger and fries! by N5VEG. It can also be adapted to operate in the 75 meter band. At some point, the short radials will form a ground screen around the base of the antenna, which is what you want. For a vertically polarized antenna, the H-. After all, a vertical antenna with radials is a dipole running vertical. Most reference books on antennas provide solid guidance on radials and counterpoises, but only for antennas cut to a specific frequency. 0:1 VSWR mismatch at full power for typical operating intervals. For our 15 and 20m verticals we applied 16 radials for each antenna, each radial being about 6 meters long. Conclusion #1 : Buried radials are not tuned. This vertical antenna has no lossy traps or coils to burn out. Without Radials. 6:1 continuously from 3. <= Back to Dayton New Products Hy-Gain 80-6 Meter Patriot Vertical Antenna AV-680, $549. 5:1), and reception from 1 to at least 90 MHz (claimed VSWR 3:1 at 150 MHz). I took my 20 foot short 40 meter vertical and tried using a spiral tuned counterpoise instead of my 24 radials. Cushcraft achieved a major breakthrough in the development of an HF multiband vertical antenna that has been specifically designed for use with a tuner and amplifier. In its nested configuration it is only 60" long and weighs in at 4. (Read eHam info) The antenna is very light weighted. In the Grounded Loop configuration, this antenna radiates like a single element vertical. On January 14, 2000 I built and installed a new Butternut HF9V vertical to replace the DX88 I had melted down the prior weekend. A number of radials connect to screw terminals on the ground plate. High Performance 40 Meters Vertical. A vertical radiator above natural earth without any sort of ground system, energized by an electromotive force between the antenna and the earth, would require all earth currents to return to the antenna through a very imperfect conductor. While tuned radials placed above the ground will work, a ground screen of untuned radials will often outperform the tuned radials by quite a margin. In reality a good antenna RF ground system should present a low impedance for radio frequencies within the band of frequencies of interest. Operate 10 bands -- 75/80, 40, 30, 20, 17, 15, 12, 10, 6 and 2 Meters with this MFJ-1798 vertical antenna and get full size performance with no ground or radials! Full size performance gives high efficiency for more power radiated. Although the vertical part of the antenna, when separated from the radials, is an unbalanced monopole, when the radials are reconnected, balance is restored for a current feed. If you are using a shortened vertical antenna, you will get much better results using a frequency on the high end of the band (above 1500 kHz). 0:1 VSWR mismatch at full power for typical operating intervals. They provide the essential ground connection that creates the “other half” of the antenna. What do I need to do to the antenna to optimize it for my favorite portion of the band (phone, data, cw)? 4. Fiberglass 80 meter Vertical - Revised: 2015-11-06 One antenna in use at K0MPH is a fiberglass 80 meter vertical. By using the very flexible and coated solid. Hy-Gain products currently in our stock have confirmed pricing!. Up to 100 kHz. It's fed with the same feedline and initial indications are it works well. Keep in mind that every end fed / vertical needs some kind of counterpoise to push against and in this case that's the coax , so don't forget a line choke near to your transceiver. Hustler 4BTV 4-band HF vertical antenna is a 4-band, trap vertical antennas that provide an omni-directional pattern. When done this way it is a compact antenna to take along. *** New Product Review *** Comet CHA250B HF/VHF Vertical Antenna By: Dan Dankert N6PEQ n6peq@dxer. AM Elevated Radial Systems Radio Guide Aug. The ground screw goes to the radials, and the top screw "Antenna" goes to the flagpole. Antenna Gain. Don't bother making them a length based on the frequency. In vertical polarization the delta loop is like two sloping quarter-wave verticals (their apexes touch at the top of the support), while the baseline feeds the “other” sloper with the correct phase. Minimizing this loss is the purpose of the ground system associated with a vertical. Conclusion #2 : Always use a balun. I then progressively shortened the radials (keeping the vertical height the same) and re-resonated the antenna with a single se-ries inductor feeding all four radials at the feed point. As shown in the figure, the antenna is usually fed at the base of the vertical element, however, the radials are not directly connected to the ground and there is nothing to keep them at ground potential. By John Portune W6NBC. The 4-BTV is designed as a self-supporting vertical to provide optimum operation in the 10,15, 20 and 40 meter bands. Fortunately there is an alternative to good vertical performance without all those radials. • Wavelength makes antennas more difficult -Quarter-wave vertical is 130 Ft -Half-wave dipole is 260 Ft, and it's "low" at only 130 ft -Verticals need radials or a counterpoise, and they work best if they're fairly large. 0:1 VSWR mismatch at full power for typical operating intervals. As I consider it a temporary antenna, elevated radials would make removal very easy. The 18AVQII can be mounted on the ground, on a rooftop, or on a mast. Our goal is to operate with two HF rigs this year, which entails 2 HF antennas. 27 foot hoa 10-40 meter no radial multiband foldover vertical with unun The 27 foot 10-40 meter Multi-Band Vertical antenna is a freestanding vertical element. Designed for hams that do not have room for ground radials. For a vertical without radials, the Gap Challenger is hard to beat. is the gravitational potential as a function of the spherical radial coordinate, is the angle subtended by, and is the velocity of light, as measured by the go-return light round-trip and clock method. End-fed 1/2 wave antennas. A lot of people hold very strong opinions without a shred of scientific evidence to back up their beliefs. Vertical HF antennas do have their merit though. Assuming losses in the reference antenna or the antenna used as a standard are minimal, all antennas obtain gain through pattern change. If I use ground radials, can the radials be next to each other in the ground? Sure. 5MHz – 57MHz! It is not a 1/4 wave vertical, but an end-fed long wire type antenna with a matching transformer in a vertical position. This counterpoise usually consists of a system of radial wires placed either on the ground or elevated above ground. This means radials. dont ever believe anyone that says you can use a ground mounted vertical like the hustler without a LOT OF ground radials. They sell a few that can work without radials, but all the instruction sheets for these antennas say they will work better with a ground radial system. In its nested configuration it is only 60" long and weighs in at 4. Longer is better than short, but short is better than none. 20m Elevated Vertical Antenna – G8ODE. A good quarter wave vertical with buried radials can often out perform a dipole that is way up in the air. 27 foot hoa 10-40 meter no radial multiband foldover vertical with unun The 27 foot 10-40 meter Multi-Band Vertical antenna is a freestanding vertical element. The earth currents return to the base of a vertical antenna along radial lines. I have a first hand example. Making a gain antenna that doesn't require a tower usually falls into the area of switched vertical arrays, like a 4-square. The DX Flagpole Antenna is an HOA approved, NO Radial, Stealth vertical antenna - a smarter, stronger, and more elegant all band option. Effect of the paired radials. All Hy-Gain prices are based on seafreighting from the USA and are subject to change due to exchange rate variations. A tremendous amount of information has been published lately about the effects of the number of radials used in a particular antenna, elevated radials and ground char-acteristics on the performance of vertical antennas. 80 Meter Tower Vertical with Short Radials Now that some other tasks are out of the way and the weather is sufficiently cool that traffic has declined in my backyard, it is time to get to work on my new antenna for 80 meters. 15 MHz) operating over average soil (conductivity = 0. 0:1 VSWR bandwidth,it can sustain a 3. on the 20 m band this antenna 6m high must be completed with a 5. Unless you want to work only stations very close to you, use a 1/4 wave vertical, an inverted L, or a T antenna with about 60 1/4 wave radials. Base station verticals installed in high wind speed areas must be guyed. The antenna works randomly, It depends on the installation place, mounting hardware, coaxial cable, etc, etc… The polarization of the antenna is also random: Vertical at the radial direction, a mixture of vertical-horizontal at the others… A dipole without a balun makes the coaxial cable (and mounting hardware in this case) to radiate. The antenna is calculated for a specific length, usually 1/4 wavelength. Radiation straight up is to be minimized. SHARE and SHOW your Antenna Ground Radials to the WORLD!. "No ground radial" HF vertical antennas - eHam. Hustler says the 6BTV will work OK without radials as long as the ground is not dry. the radials and the vertical were made equal and adjusted for resonance at 1. Each radial is going to carry very little RF current. Vertical Omnidirectional Base Station Antenna, 37-54 MHz, Aluminum, 6. the heights required by horizontal antennas for working DX is effectively beyond the reach of most hams. Question about vertical and radial placement. Verticals Multi-Band Without Radiasl (Vertical Dipoles). Joe Everheart N2CX can probably best described as a “QRP Guru”. It's not so. Now, put that vertical on your roof, with 3 or 4 tuned wire radials for each band, and it will perform pretty well. The new BB7V multiband vertical antenna provides coverage from 2 MHz to 30 MHz without radials and requires the use of a tuner. Below a small description of an easy to make and cheap multiband wire vertical. M y aim was to build a 20 meter vertical out of copper, since copper is normally a very good conductor. A tremendous amount of information has been published lately about the effects of the number of radials used in a particular antenna, elevated radials and ground char-acteristics on the performance of vertical antennas. Some like ground plane antennas have a built in ground plane radials, often drooping down to adjust the feedpoint impedance a bit. Keep in mind that every end fed / vertical needs some kind of counterpoise to push against and in this case that's the coax , so don't forget a line choke near to your transceiver. They also provide gain of 6. It has 6 telescoping sections that extend to a length of 22 feet when fully deployed. In an earlier article I looked at the impacts of base height and radial arrangement of an above-ground mount for a 2-element vertical (ground plane) array on 40 meters, one that had 4 radials per element. 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. DROOP ANGLE The graph on the right shows the effect of an increasing angle of droop. I took my 20 foot short 40 meter vertical and tried using a spiral tuned counterpoise instead of my 24 radials. Vertical Omnidirectional Base Station Antenna, 37-54 MHz, Aluminum, 6. Find out why Close. Radials & Counterpoise - Using them with Smartuners™ The SGC Smartuner gets energy into an antenna, but the design of an antenna is what controls what happens to the RF energy from there. Ok, it tipped over but no harm done. The radials should always be the same length, but I have found that you can vary them about,. The 18AVQII can be mounted on the ground, on a rooftop, or on a mast. 27 foot hoa 10-40 meter no radial multiband foldover vertical with unun The 27 foot 10-40 meter Multi-Band Vertical antenna is a freestanding vertical element. The result to the antenna can be catastrophic failure in some instances. The wire verticals are 1/4-wavelength (about 33′ tall at 7. As you can see the 17 meter element is not totally vertical but the improvement in receive from this antenna over the BW All Frequency 3-30 mhz. If your ability to put up an HIC antenna is restricted by too little space or too much regulation, consider this new no-radials vertical from Comet Antennas that covers 80 through 6 meters. Megacycle'. AM Elevated Radial Systems Radio Guide Aug. In other words these radials fully participate. i'm always impressed with simple dipoles and always resort to throwing them up. Belrose VE2CV. 95 SIGMA Ham Radio Antenna SE-HF-X80 VERTICAL RADIAL FREE ANTENNA 80 TO 6 METRES. Variable Radiator and Radial Length at a constant Displacement. I also have a metal roof on my house (here in the country in Western Washington). MY FINAL SET-UP:. Quick SWR Calculator for Vertical and Dipole Ham Radio Antennas; TOKYO HY-POWER HL-700B 600 Watt Amplifier purchase; Adding 80m to DX Commander All Band Vertical (9-bands 80m through 6m) DX Commander Contest Antenna achieves top placed UK IOTA Station; Software Modelling your Vertical antenna ground radials with MMANA. most of the antenna radiation is at a high angle, so any pattern distortion due to the mast would not be noticeable. As little as 0. I have spent a lot of time installing this antenna and conclude that the idea of a well constructed vertical antenna without radials is compelling and far from a simple installation. The shield of the coax is connected to the ground at the base of the antenna and the center lead of the coax is connected to the vertical radiator. 80 Meter Tower Vertical with Short Radials Now that some other tasks are out of the way and the weather is sufficiently cool that traffic has declined in my backyard, it is time to get to work on my new antenna for 80 meters. Iain, VK5ZD, posted some interesting information regarding the internal construction of the Comet CHA-250B broadband vertical antenna. At some point, the short radials will form a ground screen around the base of the antenna, which is what you want. If you have more wire, use it. 40 meter vertical hi I have a 35 ft 40 meter vertical with dx eng ss tilt over base this is the light duty model I guy it because of winds covers entire 40 meter band under 2 to 1 using 2 radials is set for 7. The first antenna everybody probably makes is a dipole and the second a quarter wave vertical. So I'm a very strong believer in radials. Yet, the AV-680 size, weight, and wind loading are nearly identical to the AV-640 with no unsightly radial extensions, traps, or top heavy vertical structures to render it less attractive or unsafe. The collars can be rotated and fixed so all the radials are located to one side of the antennaallowing it to be side-mounted on a tower, or next to a building wall for stealth operation. Solid one inch fiberglass trap forms for optimum electrical and mechanical stability. The 160m antenna at E73M is 26m (85 feet) Shunt fed tower with Gamma match. However, there are problems with installing verticals. To set up the simulation, I copied a vertical antenna with four radials from the Cebik model set available for purchase on his web site. -A vertical monopole antenna installed over a poor ground with an ideal radial system will have: - Near 100% efficiency and - Poor pattern (low gain and high takeoff angle) -A vertical monopole antenna installed over an excellent ground (without any radial system) will have: - Near 100% efficiency and. As shown in the figure, the antenna is usually fed at the base of the vertical element, however, the radials are not directly connected to the ground and there is nothing to keep them at ground potential. The bracket. Many folks run 64 radials and love their verticals. The 'Excalibur' is a very small home base antenna which is ideal to use if a longer antenna cannot be used. 75 inches O. At this time many stations FT8 100kms to 3300kms in 40 m band : wonderful , practically all the europe at. net) Introduction. Radials can be rather small diameter wire since so many of them exist to share the return currents and they are in parallel with the ground currents in the earth as well. Each radial wire is about 16 feet long. Do not dig a hole and bury the mast. Excellent explanations about antenna radial systems are provided by some manufacturers, for example by SteppIR and Bencher (english text):. If you have enough aluminium you might consider raising the antenna base and have elevated radials so more of the antenna clears the building. All information, images, and documents on this website are the sole property of Hygain Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from Hygain. Suggestions for the installation of the AP8A Vertical Antenna The AP8A Cushcraft installation manual has limited information about the types and methods of installations for this quarter wave vertical antenna. Petlowany Three-Band Burner Antenna -- Trapless short vertical antenna - Resonant on 20, 15 and 10 meters, without traps, 12 and 17M with a tuner. It has 6 telescoping sections that extend to a length of 22 feet when fully deployed. Search for used cx 1000 30 1250. Radials must be tight, one end insulated, the other one fixed at the antenna base (in fact to the mast, the gray tube) to be efficient as their are fully integrated in the antenna design. Stainless steel clamps permit adjustment without damage to aluminum tubing. Keep in mind that every end fed / vertical needs some kind of counterpoise to push against and in this case that's the coax , so don't forget a line choke near to your transceiver. Since ground radials can occupy quite a bit of apartment space, he recommends using a balanced antenna or a few radials "to balance an unbalanced antenna such as a vertical. 4 out of 5 stars 4. Super Antenna MR1710 SuperWire Radial Set for HF Vertical Antennas 17m 15m 12m 11m 10m Bands ham Radio MP1 Ground Plane. Suggestions for the installation of the AP8A Vertical Antenna The AP8A Cushcraft installation manual has limited information about the types and methods of installations for this quarter wave vertical antenna. In these challenging band conditions I've been doing Europe, Patagonia (6,500 miles) and United Arab Emirates, all from Wisconsin. One way to get a good ground system without dozens of radials is to use elevated radials. These antennas may be ground mounted with or without radials or elevated mount with radials. So on a 40 meter vertical you can have a few radials that are 34 feet (ideal 1/4 wave at 7. This is a top-loaded 80/40 meter vertical which replaced my Butternut once I installed a tower with a beam, and no longer needed a vertical to operate above 40 meters. Hustler 4 BTV with no radials 20ft from base of antenna to ground with 6mm wire earth to ground spike. Operate 10 bands -- 75/80, 40, 30, 20, 17, 15, 12, 10, 6 and 2 Meters with this MFJ-1798 vertical antenna and get full size performance with no ground or radials! Full size performance gives high efficiency for more power radiated. In an earlier article I looked at the impacts of base height and radial arrangement of an above-ground mount for a 2-element vertical (ground plane) array on 40 meters, one that had 4 radials per element. dont ever believe anyone that says you can use a ground mounted vertical like the hustler without a LOT OF ground radials. Get the Best Performance From Your New Quarter-Wave Vertical Antenna 11 Some Brief Words on Ground Mounting, Elevated Mounting, and Radial Wires 12 How to Put Radial Wires Down Without Digging 13 Radial System Considerations 14 Chapter 5 - Basic BTV Assembly Assembling Vertical Aluminum Antenna Sections & Element Clamps 17. A lot of people hold very strong opinions without a shred of scientific evidence to back up their beliefs. With a vertical height of only 7. To ground mount your antenna, use a 4 foot metal pipe or mast of 1-1/4 in. Cushcraft achieved a major breakthrough in the development of an HF multiband vertical antenna that has been specifically designed for use with a tuner and amplifier. I fondly call it my 24 foot dummy load. 1 Ground System. This is the third antenna. Hustler 5BTV 5-Band HF Vertical Antenna and DXE Installation Guide Packages are trapped-vertical antennas that provide an omni-directional pattern. The R8 is the first multiband vertical designed for the rigors of contemporary operating conditions. If your ability to put up an HIC antenna is restricted by too little space or too much regulation, consider this new no-radials vertical from Comet Antennas that covers 80 through 6 meters. 40M Vertical October 2014 Radial Choice Page 14 From the ARRL Antenna Book: From QST, March 2010, pp 30 Practical Suggestions For Vertical Ground Systems At least 16 radials should be used if at all possible. Stainless steel clamps permit adjustment without damage to aluminum tubing. We sell all types of base station HF Vertical Antennas for ham radio, If you are looking for quality HF-Base station antennas at a great price then look no further, We stock Vertical Antennas,And More, From all the top antenna manufacturers, Includes Cushcraft antennas,Diamond antennas,Radioworks antennas,Comet antennas,Watson Antennas and more. <= Back to Dayton New Products Hy-Gain 80-6 Meter Patriot Vertical Antenna AV-680, $549. These antennas may be ground mounted with or without radials or elevated mount with radials. However, there are problems with installing verticals. The ground screw goes to the radials, and the top screw "Antenna" goes to the flagpole. antenna I have on my tower is dramatic. Congratulations on your new antenna. Your 16' radials are relatively short (1/8 wave) on 40m. This simulation was based on 3 radials mounted at 20' (woolshed height) over typical clay soil (13,5). In a vertical antenna mounted above ground, the situation is a little different. It is taped to the mast as it goes up. The supporting structure is made of progressively smaller sections of 8 foot fiberglass tubing for a total height of 45 feet. The highest SWR I have recorded on 2m is 1. My new antenna is a Sand Piper MV- 5+3 vertical multiband Ground Plane. For example, a. Then i ran some 14m horisontal antenna wire from the top of the alu pole, to a fibreglass mast. without a radial system. Hustler 5BTV 5-Band HF Vertical Antenna and DXE Installation Guide Packages are trapped-vertical antennas that provide an omni-directional pattern. After all, a vertical antenna with radials is a dipole running vertical. Diamond's new CP5H is a five band (40M, 20M, 15M, 10M and 6M) trap vertical antenna with trap radials. 5 and on 6m 1. Any vertical without ground radials is only half an antenna. The supporting structure is made of fiberglass tubing but the radiation is from a wire taped to the tubing. I also plan to put up the 20m vertical element as before so I can have a resonant antenna on 40m, 20m and 15m (3rd harmonic of the 40m). > > Could you recommend me a HF vertical multiband antenna > > (80,40,20,10 or more bands) which doesn't require > > radials? > Is there a commercial HF vertical available in > Spain that doesn't require radials? I don't know about availability in Spain, but I used to have a Gap "Eagle" vertical that needed no radials. In its nested configuration it is only 60” long and weighs in at 4. QRPGuys Portable 80/60m Vertical Antenna – $20 Expanding on our experience of using the readily available $10 eBay telescoping 17′ fiberglass fishing poles for a vertical support in the Tri-band Vertical Antenna, we are offering a portable 80/60m, center loaded, 15′ long vertical antenna. Get YouTube without the ads. 11 , shows the current magnitude along both the vertical and each of the (4) radials for a sample 1/4 wl monopole with ground plane. Conclusion #2 : Always use a balun. 5 and on 6m 1. Still, practical radial systems can be large. This means radials. The result to the antenna can be catastrophic failure in some instances. 5MHz - 57MHz! It is not a 1/4 wave vertical, but an end-fed long wire type antenna with a matching transformer in a vertical position. When cutting the pole for length, it's always best to make it a little long and then trim back the flagpole to correct resonence. Introduction. 6 ft) using radials and a commercial "no-radial" vertical will display the same performances, but the SWR of the second antenna at the feed point can reach 20:1 or more without losing any energy but without neither emitting the least watt !. This type of antenna, unlike the dipole, is an unbalanced antenna, and should be fed directly with coaxial cable. The 27 foot 10-40 meter Multi-Band Vertical antenna is a freestanding vertical element. The earth currents return to the base of a vertical antenna along radial lines. This is a misconception based on elevated or ground plane type elements. The antenna has to be installed on my terrace, and I do not have the room for a network of radials - certainly not radials with a length of 1/4 λ on 80 mtrs. I then progressively shortened the radials (keeping the vertical height the same) and re-resonated the antenna with a single se-ries inductor feeding all four radials at the feed point. Current regulations require AM broadcast antenna vertical radiation patterns to conform to a specific equation that was originally devised for a conventional tower with radials. High Performance 40 Meters Vertical. net One of the most popular types of antennas today in the U. In its nested configuration it is only 60" long and weighs in at 4. They are very well built, using good quality "doorknob" capacitors, and nice airwound low-loss coils. An inductor Q of 250 was assumed and with a little care this should be. Comparing the resulting antenna characteristics of Table 2 with Table 1, note that: 1-Radial now has the longest % Length compared to the vertical arm. Minimizing this loss is the purpose of the ground system associated with a vertical. 1500 Watt Rated 1:1 Feed line Choke (Unun) for Verticals with radials Th CUV-1-1500ST unun is a common mode feed line choke for vertical antennas with radials that need to be isolated from the coaxial feed line to keep common mode current from using the coaxial braid as another radial. The traps also shortens the antenna a bit. Still, practical radial systems can be large. 0:1 VSWR mismatch at full power for typical operating intervals. Making the antenna more efficient by adding radials increased the swr to 7:1 and reduced the bandwidth!. Table 2 and Table 3 are loss data for 40 and 160 Meter vertical antennas over average soil. Be aware of RF dangers close to indoor vertical antennas. Conclusion #1 : Buried radials are not tuned. 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. I did some testing over the air using 16pcs of 1/16 wl radials and without and most stations report that there was more punch to the signal when using a radial system although it did not always show up on the S-meter. Don't bother making them a length based on the frequency. The vertical section is 33' 2" of #14 stranded wire. Operate 12, 17, 30, and 60 Meters with these MFJ Stealth WARC Band Vertical Antennas. My new antenna is a Sand Piper MV- 5+3 vertical multiband Ground Plane. So it was created antenna without any spacer. Drive it into the ground, leaving 18 in. antenna efficiency by 30% to 50% for a 0. It's a toss-up between a tall collinear vertical (for FM work) or a yagi. In this article I want to look further at radial topology of vertical arrays for the low bands. It was nice priced, so worth spending some euro’s for it. It is needed at least two spacer to build the antenna. 15 MHz) operating over average soil (conductivity = 0. The R8 is the first multiband vertical designed for the rigors of contemporary operating conditions. One way to get a good ground system without dozens of radials is to use elevated radials. Hence, you get higher efficiency with radials even though the SWR is higher. The antenna does not require traditional ground radials, so no need for unsightly radials and is so light a normal scaffold pole would be ideal to mount the antenna. 1 wavelength separation from earth does wonders for efficiency. The collars can be rotated and fixed so all the radials are located to one side of the antennaallowing it to be side-mounted on a tower, or next to a building wall for stealth operation. The main category is Cushcraft R7 Antenna that is about Cushcraft R7 Antenna. Conclusions for a 1/4 wave vertical antenna with underground radials. Our radial kits are made from extremely high quality black jacket Flex-weave wire. In this article I want to look further at radial topology of vertical arrays for the low bands. I have a first hand example. Something along these lines has been "conventional wisdom" for a long time but I'd never seen any real justification for it. Another advantage is that it can be placed where there is no good ground or at the edge of your lawn so you can cut your grass without thinking of radials on ground. On the ground, it's modeled with 32 radials; at 20 and 33 ft, there are four radials. I have do not have provision for installing radials. Vertical HF antennas still remain useful. It took us three times to get it close to frequency, but we managed. Broader frequency coverage than other collinear antenna. This antenna was built for use without a transmatch or antenna tuner. So I bought it. Variable Radiator and Radial Length at a constant Displacement. The braided wire which forms the outside conductor of the coax is soldered to all four radial wires. We also installed 2 elevated radials, and then laid down about 20 ground screen radials of various lengths.