• Radiating element will be a dipole that is ½ wavelength for the frequency. I found the lengths he gave to need some adjusting. Much taller than the average Ham mobile antenna, this tree branch snapper tops out at 17 feet, 10 inches above the road. Many know what to expect from a dipole, I will try to compare this allrounder theoretical and practical with a shorted VERTICAL dipole antenna which can be set from 10-40 meter. 95: dp-2bdq: multiband hy-q trap doubler for 80 and. This approach has no tuning function, however, so the Free Radio Berkeley Balun is suggested - 1 to 3 turns of coax at about a 6" diameter. Hits: 113 Now that the VE7BQH list has had some added parameters to better show noise performance in urban and city environments, the LFAs now stand out against anything else almost without exception. OB4-40 4 Element 40m duo driven Monoband-Yagi The best 4 element 40m duodriven monoband-Yagi of the world: The OptiBeam high Q air coil reduces the length of the elements nearly lossfree down to clearly below convenient 15 meters. The loop is a little quieter than the dipole, especially on the lower bands. This is the length of a standard. In most cases you forget about about this fact. 1 db on 20 and 15. Swaging of element sections creates a more attractive antenna, reduces wind load, eliminating possible vibrations causing metal fatigue. NVIS Antennas Antenna, Short Dual Dipole, Portable, NVIS, 80 and 40 Meters Dual Band, Kit Wire Antenna Band 80 meters 40 meters DX Engineering 8040 NVIS Antennas: Near Vertical Incidence Skywave (NVIS) is a propagation mode which uses high-angle radiation. Youkits Technology Incorporated, the QRP radio company that making HB1B HB1A CW transceiver, FG02 FG01a antenna analyzer, TJ2B TJ5A SSB CW transceiver. 200 and will be usable across both the 40 and 20 meter bands for Field Day using the internal antenna tuner in the club’s Kenwood TS-570. A 40-Meter Star Topics: 7 MHz, antenna, design. 6 MHz and you arrive at an overall length of 130'. Please note that these resonators require a mobile mast (MO-1/2/3/4) and mount which are all sold separately. 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 17 meters! An Efficient Multiband Vertical for 160 through 20 Meters QST October 1998, pp. Weighing only 12-pounds, the MA160V installs easily and blends in with backyard trees and vegetation. 5, and Hi-Q-3 antennas. Twenty meters designates the length of the particular radio wave used to transmit and receive voice and Morse code. Buy Cell Phone + VHF + UHF Jammer 6 Antenna 40 Meters for sale. MFJ will repair or replace (at our option) your Ham-tenna no matter what for one full year. I like to use a home made current choke to keep RF from coming back on the feedline. A dipole is basically a mono-band antenna. The next generation in Design and manufacturing. It is made with very high quality materials and the best in its class in the market in terms of mechanical construction and electrical performance. great working order Cushcraft antenna gets out very well. No, this is not about some cute antenna that's about the size of an oatmeal box and runs at 100% efficiency from 160 all the way up to 10 meters (and 6 meters if you leave the oats). The following photos and writeup are the results. ARRL Product Review of the M2 6-Meter HO Loop Antennas. After trimming, the 80 meter elements were about 4 feet long for a total antenna span of about 76. I took my 20 foot short 40 meter vertical and tried using a spiral tuned counterpoise instead of my 24 radials. The large diameter vertical element means more bandwidth and high wind handling. I have phased verticals on 40 for DX but this EDZ antenna has great potential on 40. The angle between the two legs us usually between 90 and 120 degrees. Doubling your power out without impacting your electric bill or your neighbors T. You may also need to use an. So my question is: Now that the sunspot cycle is going to continue going down, 40 is going to be my main band, but I would like to have a better antenna and signal. The larger the wire, the wider the bandwidth. This coil came from a broadcast transmitter. 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. The shape can be a circle, square, rectangle or a triangle. Efficient Portable Ground Mounted Vertical Antenna for 40 Meters August 20, 2015 September 1, 2015 raycharlesring RF I like to work QRP CW and exclusively use home brew portable equipment. The formulas above are for typical wire dimensions. It's just about a very common HF antenna that I recently built. measured about 100 kHz, the 40-meter at 40 kHz and the 75-meter about 20 kHz. It's also ideal for those who want a high performance antenna with world class DX coverage 40, 20, 10, and 6 meters. I soldered my antenna wires to the connector and used tape and sealant around the coax. W4RNL Antenna Theory. I built an experimental antenna similar to the TAK-tenna spiral antenna and was evaluated for SWR response over the frequency range of 7. G5RV Formula - a simple multiband antenna ! By Rick, KC8AON. Finally , the only snag I find with verticals in the UK is that they tend to pick up a lot of local noise on receive. 5, and Hi-Q-3 antennas. crank up tower and considered various antennas to put on top. Leg length examples for 3/4 wave length per side:. No, this is not about some cute antenna that's about the size of an oatmeal box and runs at 100% efficiency from 160 all the way up to 10 meters (and 6 meters if you leave the oats). 005 Siemens/ meter and relative permittivity = 13). The relationship between a radio signal's frequency and its wavelength can be found by the industry accepted formula wavelength equals 300 divided by the frequency in megahertz. So the measurements are based on a 40 meter 1/2 wave dipole. Download 3 Gap Antenna PDF manuals. Overall the antenna will be about 17' square but that is still smaller than a lot of 40m beam antennas (which I know this will not be). Design Parameters For an 80-10 meter OCF dipole antenna, divide the ½ wavelength standard of 468 by the lowest operating frequency of 3. Approximate Bandwidth 2:1 SWR or Better: 40 - 50 kHz. FREE Same Day Shipping on all orders. This formula takes into consideration the capacitive "end-effect" from insulators which shortens the physical length requirement for the equivalent electrical length. První praktické zkušenosti. "Summits On The Air" with W7MRC, Amateur Radio, Rhodesian Ridgebacks, Old 4 Wheel Drivers, Mountain Bikes, Hiking and "Just Getting There". W3DZZ Multi-band Antenna 80-40-20-15-10m N. Choose from top-brand HF Yagi, HEXX beam, and other rotatable antennas to meet your high-frequency needs. 15 MHz) operating over average soil (conductivity = 0. Plus two radial spreaders. To construct the antenna, build the boom and the elements including the sections EH through ED (driven element) and EA through ED (reflector), as shown in the Cushcraft XM240 manual. Enough of that, time to design that 40 meter vertical dipole. - A standard / remote tuner at the feedpoint will ease construction and allow operation from 3. The radials contribute to the radiation efficiency of the entire vertical antenna system. 01 This note looks at the antenna and antenna model for the 40 meter Moxon Yagi designed by Dave Leeson, W6NL. Its draw back is it is 81 feet on each side-- (Yuk) Give it a try. 7 meter tall aluminum mast mounted 3 meters above ground. 1:1 SWR at the antenna connector of each Vertical. The coil used is big enough to cover the 40 meter band as well. Add Review ×. 40 NIKE 7092 Eyeglasses all colors: 001, 068, 311, 405, 011, 010, 200, 001, 011 SJ200 Gauss Meter Tesla Meter Magnetic Flux Meter 0. Each antenna is installed and tuned to give a 1. At a minimum, 20 radials, each 32 feet long, should be used with this antenna. 6 Mhz which confused me. 3), cut to a length of 468 (feet)/frequency. Buy Mobile Ham Radio Stick Antenna 40 meter: Radio Antennas - Amazon. Recent Vehicles. Half-wavelength verticals have HIGH VOLTAGE near the feedpoint. Paolo is located on a little island in Italy He is situated only 20 meters from the sea on the East front. I decided it was time to set up a 2 Meter base station. The No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. 5:1, and are less than 35 ft. Using the whip, ≈20 show. By John Portune W6NBC. At the least, a dipole should clear any sur- rounding buildings, and other large obsta- cles, for good performance. Amazon's Choice for 40 meter antenna. 00 Wind Rating - 85 Pattern - Omni * Bandwidth is within 2:1 SWR. Wire Antennas that Work. Approximate Bandwidth 2:1 SWR or Better: 40 - 50 kHz. Everything you will need to get that big signal on 160 Meters. 160 m loop on 80, 80 m loop on 40, 20 m loop on 10, etc. A 3" to 3-1/2" aluminum boom would be expected. 10 meter (10M) Half-Wave Amateur Ham Radio Dipole. I had used cubical quads for many years and the decision for 20 meters and up was easy, but what to do For 40 Meters?. Pre-Order Now. The measurements below are for building a simple Dipole Antenna. We strung it in the trees of the campsite, fed-end high with a 60 foot RG58 feed, 45 degree of slope with 35 feet of wire. net is a Web site dedicated to ham radio (amateur radio). One separate dipole for each band. Jim was the one who told me that if I made the legs 22 feet on a side that the antenna would have basically the same radiation patterns on all bands from 40 - 10 meters. Finally and after many prayers and here the new Hexbeam with 40 meter band including 7 Bands! Note: The 40 meter band is not directional like the other bands, it is a folded dipole. COMTEK 40VA Vertical Antennas are rugged, yet economical quarter wave antennas designed primarily to be used in sets with phased vertical array systems. length of dual wire‐stranded stereo speaker wire and. It is basically a mono-band antenna. Efficient 2 meter Disguise Antenna. It's performance will be a function of frequency, but so long as you adjust your antenna model for the frequency, you can obtain results which I believe are quite reasonable. The antenna is constructed much like an ordinary Dipole antenna but with 5/8 Wavelength Elements matched with an added Impedance Matching Section of balanced feed line. Search this site. This vertical antenna has no lossy traps or coils to burn out. It’s the best 40 meter. Getting a Big DX Signal on 160-10 m from One Small, Low Antenna by Chuck Counselman, W1HIS YCCC Scuttlebutt April 2008 Page 3 The photo is hard to understand, so here's a scale drawing. With a broad portfolio of quartz crystals, crystal and MEMS oscillators, real time clocks, power inductors, IoT antennas and more, Abracon helps engineers transform their ideas into products that meet the opportunities of tomorrow. 42 51 –j86 20 meter 8. For The Following Yaesu Amateur Radio Models - FT-857D, FT-991, FT-897D, FT-450D, FT-450AT, FT-450, FT-100D, FT-100, FT-857 Only. The tuner loaded easily on 40 meters, but that proved nothing. Tuning the COM-40VA 40 Meter Vertical Antenna is straightforward and intuitive. Pre-Order Now. Click on Calculate and the optimum length for that combination will be displayed in feet, inches and fractions of inches, and in meters. Buy Base Station Radio HF Ham & Amateur Radio Antennas and get the best deals at the lowest prices on eBay! Great Savings Free Delivery / Collection on many items. That's what I did in August of 2009. The ULTIMAX-8040 broadband dual band double bazooka for 40 & 80 meters is a fantastic antenna using a newly designed "HY-Q" coax coils that gives outstanding broadband performance on both bands requiring only 103' feet of space. 80/40 Meter Attic Antena I live in a tightly packed urban neighborhood without much room for antennas. This is a four wavelength-per-leg 40-meter V-beam antenna: Gain is 14. 2-meter beamsone vertical and one horizontal. Enough of that, time to design that 40 meter vertical dipole. I used heavy outdoor electrical conduit with an outside diameter of 22. usually easy to match on all-bands from 40 meters through 6 meters with good antenna tuner. 20meters cable FM 1/4 wave Professional GP Antenna Aluminium alloy antenna. Thanks for subscribing to the newsletter!. This multiband vertical designs provide 9 band coverage encompassing the 6, 10, 12, 15, 17, 20, 30, 40 and 80 meter bands. A 3" to 3-1/2" aluminum boom would be expected. A portable vertical antenna for 10 to 40 meters, designed for mobile operations can be used in a car as seen in pictures. This is a very cheap and simple antenna – you may like to give it a try. A Simple 40 Meter Vertical for Field Day. We can also provide Fiberglass Stick Antennas by Workman Electronics for 6, 10, 12, 15, 17, 20, 40 and 75 Meters. 1mT / 1mT with Power Supply. You can shorten a vertical antenna by using a loading coil. Swaging of element sections creates a more attractive antenna, reduces wind load, eliminating possible vibrations causing metal fatigue. This antenna leaves a small footprint. (first call) so I remain hopeful. Strip 2″ off one end of 20/40 meter #14 wire sections (Note twist the wire tight). The Slim Jim, designed by the late Fred Judd, G2BCX, can be a great portable ‘roll up’ antenna, if made out of 300Ω or 450Ω ladder line / twin feeder. MFJ-1640T 40 Meter HF Hamstick Style Mobile Antenna This MFJ monoband mobile HamTenna Whip makes HF mobiling fun and easy! Theyre small, lightweight, efficient, and super easy-to-use. Maybe I will replace my inverted V dipole for a Hy End Fed for 40 meter. For instance, DX Engineering DVA Dual Vertical Array systems and four square arrays from COMTEK and DX Engineering or any other four-square array controllers. the HF bands and 2 meters. So on a 40 meter vertical you can have a few radials that are 34 feet (ideal 1/4 wave at 7. Richard said. 9 out of 5 stars 34. The article offers information on a design featuring a matched coax fed antenna with performance similar to a full size dipole on to bands, 40 and 20 meters. The following photos and writeup are the results. SAR uses the motion of the radar antenna over a target region to provide finer spatial resolution than conventional beam-scanning radars. My inverted-V at 40 ft. Outstanding performance on all bands with a tuner. 6 dBd gain on 40 meters, up about. This calculator can be used to design a Slim Jim or a J Pole antenna. have tried a 160 meter dipole, but had trouble tuning the antenna on some of the higher bands. Half-wave 10 meter dipole antenna measuring up for bid is an mfj super antenna tuner. This online calculator tells you how the amout of inductance your loading coil will need to have. Model: Gpa 40-70. This antenna uses two dipoles, one for 75 meters (about 122 feet), and one for 40 meters (about 65 feet), both connected directly to 50-ohm coax and supported at 5 points by trees at 10-12 feet. Among the many proposed uses for aerial drones, one of the most compelling is the search for survivors at disaster sites. The JK402 is a short boom 2 element 40m Yagi that has excellent gain and F/R. A portable vertical antenna for 10 to 40 meters, designed for mobile operations can be used in a car as seen in pictures. The plan is to make a End Fed Wire Antenna for 10,15,20 and 40 meter band. You can get gain from this antenna on the higher frequencies. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. As described above, I built the 80 meters spiral loop antenna designed by Harry, SMØVPO. Listening antennas for Asia and Pacific Needed!. Electromagne2c' Wave'Polariza2on' • Electric'and'magne2c'waves'are'at' right'angles'to'each'other' • Magne2c'wave'dissipates'within'a' few'wavelengths'of'antenna. However, you may find that your mono band delta loop may tune up on it's second harmonic at a higher frequency eg. Buy Base Station Radio HF Ham & Amateur Radio Antennas and get the best deals at the lowest prices on eBay! Great Savings Free Delivery / Collection on many items. 6 Mhz which confused me. Antenna gain is measured in either dBi or dBd. amateur radio ///// Stryker SR-955HPC 10 Meter Amateur Radio Posted: 24 Oct 2019 01:49 PM PDT https://www. Are you one of the unlucky Ham radio operator’s that after the purchase of your dream home discover of the antenna restrictions they have, well don't you worry with ULTIMAX antenna you can still live in your dream home without giving up your hobby. We will take an inverted V for 40 meters, an antenna which is widely known amoung HAM's as an allround antenna. 40M NVIS Antenna…. Feeds with 50 Ohm coax and comes factory pre-tuned with Hy-Gains exclusive BetaMatch Tiltable boom-to-mast bracket and stainless steel hardware is included. 150MHz, so this is the frequency we will stick with to build our 40 meter Bazooka. 80 - 10 Meter HF Stealth-Portable End-Fed Wire Antenna. N6BT has done repeated tests that show that a flat-top dipole mounted at the same height as the apex of an. The Compact Quad Multiband HF Antenna An easy to build loop with a simple matching section offers four band HF coverage. ULTIMAX offers several antenna designs for stealth operation, we also provided great support in choosing the antenna better suited for your situation. Shown above is the jeep rigged up in the 40 meter Mobile Shootout configuration. I settled on a 2 meter vertical dipole. ground plane antenna with radials. Written By: Scott Wolfington The following article is based on a HamUniverse. This antenna is an excellent performer, and ruggedly built. The V-beam antenna is the first part of a rhombic antenna. I never have to tune on 40 meters, but my HF radio does have an internal tuner if I need it. Each antenna is installed and tuned to give a 1. Sloper antenna for both 40 and 15m bands cut into tower guy wire. HF verticals are versatile, and can deliver both multiband and monoband performance. Collinear antenna building, by Karl Shoemaker, AK2O. If this does not present a problem and if you have the space this is the primier DX antenna for 40 and 75 meters!!!!! We are not limited to only 40/75 meter versions of this antenna. This is roughly 64 feet 4 inches. end fed, horizontal wire antenna. The tuner loaded easily on 40 meters, but that proved nothing. I am impressed with the performance but to be honest with you my 40 meter Inverted-V sometimes does better but then again sometimes it does not. Boom = 30 in/76cm; sprial radiating element = 30 in/76 cm diameter; weight = 4 Lbs/1,8Kg. - Leading supplier of wireless communications infrastructure and mobile products. 5 ft) of rigid ( = thick wall) PVC tubing. The Half Square antenna is a great wire antenna for the DX edge. Product Description. 5/5click here to see their performance reports. Double Bazooka NVIS Antenna Calculator. It is a full size antenna on 40 meters and a shortened 80 meter antenna. The next generation in Design and manufacturing. Formula Dipole total Length = Amount / frequency Each leg of the dipole = Dipole Total Length / 2 Inverted Vees total length = ( Amount / Frequency ) * Percent Each leg of the Inverted Vee = Inverted Vees total length / 2 Where, Full Wave = 984 Half Wave = 468 Quarter Wave = 234 This tool will help you dynamically to calculate the total length of a dipole inverted V antenna. * Impedance - 50-75 ohms Freq. 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. With a good antenna tuner the antenna will work 6 thru 160 meters. That process could soon be made much more efficient, thanks to a system. antenna system. This is a neat antenna! Select the Details link to read more about it. Sites like KK4OBI show the plot of the V antennae. Review Summary For : ZeroFive Antennas 10 - 40 meter multiband vertical; Reviews: 10 MSRP: 190. SWR across the 40 meter band for W5DXP's No-Tuner All-HF-Band Antenna given the chart lengths of ladder-line. A vertical seemed the obvious answer, a naturally low-angle radiator. The inductor on the CB antenna makes the antenna electrically longer than its actual radiator length. 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. N6BT has done repeated tests that show that a flat-top dipole mounted at the same height as the apex of an. This makes these 40 meter yagis more friendly to stacking arrangements. This morning, on 30 meters, I also worked EA3NT for the. I built an experimental antenna similar to the TAK-tenna spiral antenna and was evaluated for SWR response over the frequency range of 7. The Feed and Phasing cables are added. I haven’t added any extra length to allow for a mechanical connection either. You can also use these traps to design HF vertical multiband antennas using either wire or aluminum tubing. Coil-Shortened Vertical Antenna Calculator. 40 Meters is a bit touchy do to the lenght of the antenna now being a 1/2 wave on 40 meters and i'll need to get a feeling of how. Design Parameters For an 80-10 meter OCF dipole antenna, divide the ½ wavelength standard of 468 by the lowest operating frequency of 3. Since 10 meters and cb (sometimes refered as 11meter) are so close in bandwidth often a cb antenna can be tuned for 10 meter. d plastic tubing ( white plumbers tubing). Our S lopers per - form beat when used with a ground-nounted tower with at least a tri-band beam on top, for *Top- " W 91 NN Slopers may be ground performance to t owe systems be enjoyed if ground system a o. ' If only one half of it is used it becomes a 'half sloper. Really well made antenna, easy to assemble. The bandwidth limitations on 160 and 80 meters can be largely offset with an antenna tuner. You can mount them high and away from the trees for better performance than a wire dipole. ULTIMAX offers several antenna designs for stealth operation, we also provided great support in choosing the antenna better suited for your situation. According to the ARRL Antenna Book 18 th Addition there are two sloper design definitions a sloping λ/2 dipole is known among radio amateurs as a 'full sloper' or just 'sloper. As for 160 meters, consider it lost. If not, put up what you can manage. In the first two columns, the antenna's height above ground is given in wavelengths and in feet. Sites like KK4OBI show the plot of the V antennae. Data is valid provided helix dimensions and wire gauge allow close-wound practical antenna construction. The best NVIS antenna is one which is simple and effective. Using the whip, ≈20 show. 25 metre length of 24/0. The antenna consists of a regular 40 meter dipole using a 1:1 balun at the feedpoint. My best band was 40-meters, followed by 15- and 20-meters, where the tuning was a bit more critical. hi hi I made the antenna 142 feet long. The mechanical and electrical design can be made using a single piece of nominal 450 Ohm window line. Here is a picture of my EndFed wire antenna. 10 meters swr 1. The Mosley "Quality of Antenna Excellence" has become a standard to the industry. The Antenna Farm PCTEL Maxrad RBGBN - Manufacturer PCTEL Description The PCTEL Maxrad RBGBN magnetic antenna mount is a Motorola-style mobile antenna mount that offers removability. DX-EE - “No-Trap” 40-20-15-10 meter dipole or inverted V. HF verticals are versatile, and can deliver both multiband and monoband performance. Nick Henwood G3RWF Graphic Design - G8ODE 3 Mar 2009 iss 1. I just used them because they were cheap, easy to get, and strong. The antenna was resonant on 40 meters anyway. A 3" to 3-1/2" aluminum boom would be expected. Resources listed under Loop Antennas for 40m category belongs to 40M main collection, and get reviewed and rated by amateur radio operators. 1mT / 1mT with Power Supply. Each antenna is installed and tuned to give a 1. 00; Description: This vertical is a 24 foot tall freestanding element. 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 Radio Stuff- Antennas, and Such by Spencer Sholly RT(R)(ARRT). Finally and after many prayers and here the new Hexbeam with 40 meter band including 7 Bands! Note: The 40 meter band is not directional like the other bands, it is a folded dipole. This is a four wavelength-per-leg 40-meter V-beam antenna: Gain is 14. 7%, similar to an 80 meter mobile antenna. 160 m loop on 80, 80 m loop on 40, 20 m loop on 10, etc. Search this site. Super wide bandwidth means more time operating ,and less time stuck on a frequency your trap vertical is tuned for. One favorite is the dual-band dipole. In stock fast delivery call now. You will need the following materials:. Many hams’ first choice of antenna is a half-wave dipole. The problem with an end fed half wave antenna is that the antenna presents a high impedance, creating a. The antenna I used has a 53″ stainless steel whip. 6 dBd gain on 40 meters, up about. I had the best results with a straight 33 foot long wire on 40 meters and a similar length of wire center loaded on 80 meters. • 40 Meters – No significant difference in gain or pattern – Slightly less SWR bandwidth • 80 Meters – No significant difference in pattern – Gain about 0. I have purchased one, and the construction is superb. The EDZ is a fine antenna with several special properties. The larger the wire, the wider the bandwidth. Construction: I made and put this antenna up the Friday afternoon before the ARRL RTTY Roundup (1999)! It took me about 3 hours to make and install on the tower. A Stealthy HF Coat Hanger Antenna. We designed and built this antenna to mount just below our tri-bander at about 70’ on a crank-up tower. F/B does degrade though not by enough to be a concern. In my own house, the paper shredder, microwave oven, furnace ignition system, eliptical exercise machine, dvd player, and other assorted appliances can cause quite a bit of momentary noise that is picked up by my main transmitting wire antenna for the 160 - 40 meter bands. The Russians have always had a special love for 41 meter AM broadcasting. So the measurements are based on a 40 meter 1/2 wave dipole. provides dimensions for the Moxon rectangle for 40 through 10 meters. It's well made and on 1, 20, and 40 meters it works really well with NO tuner. In 1998 I built the Jade Products SLR-40 receiver kit, so that I could have something that fit easily in my suitcase. Simple End Fed Half Wave for 40m (and how it works) (and SWR meter, if your transceiver doesn't have one) or antenna analyzer and apply (low) RF power on the. antenna system. City dwellers sometimes find it difficult or impossible to erect full-size antennas for the lower ham bands, so there is considerable interest in more compact alternatives. The coil is a bit over kill to just run 200 watts through it, but it was given to me. This gain is approximately equal to a small three element Yagi antenna. 40 Meter Four Square Antenna. While 1/8th wave works reasonably well, better coverage is obtained if the antenna is mounted at about 1/20th wavelength above ground. Cullowhee n. I support the feedpoint on a push-up painters pole on the rear of an RV trailer and drape the wire over a nearby tree branch. It gave me 40, 20 and 15 with a push because although a 40 meter dipole should give you a resonant 15 meter antenna, in this case – with the coils for 40 – it mucked the maths up and caused the ATU some trouble. The RADIO WORKS' SuperLoop 80™ is a high performance, full size, full-wave, 80 meter loop antenna. It works and it works quite well. Must do mobile as HOA rules. 5 KW SSB RATINGS, HEAVY DUTY CABLE 701630965119 1. Running about 40w from this hotel basement QTH on the west side of the island, I was easily working into the European continent on 40 and 20m in SSB. 15 MHz) operating over average soil (conductivity = 0. One favorite is the dual-band dipole. BUILD THIS MULTIBAND FAN DIPOLE FOR ALL BAND HF ANTENNA EXCITEMENT Here is a fairly simple and easy to build multi band horizontal fan type dipole that can be constructed for all band operation from 160 meters up thru 6 meters or even higher. Click on Calculate and the optimum length for that combination will be displayed in feet, inches and fractions of inches, and in meters. ULTIMAX offers several antenna designs for stealth operation, we also provided great support in choosing the antenna better suited for your situation. Pro rychlé měření krátkovlnných antén nastavuji krok azimutu 30°. Power and Antenna Gain on 60 Meters Our new 60 meter allocation restricts you to 50 W PEP into a dipole, but what if you're not using a dipole? How much power can you use? tiles for the new 60 meter band re- quire that the operator use no more than 50 W PEP into a half-wave dipole, or an equivalent ERP (effective. The boom is 40' long and the elements around 67' each. A few days ago, SWLing Post contributor, Robert Gulley (AK3Q), pointed me to an excellent website by Harry Lythall (SM0VPO) which is chock-full of various homebrew radio projects. Collinear antenna building, by Karl Shoemaker, AK2O. I proceeded to make a very heavy dipole from copper pipe, akin to the type used for J-poles. The tuner loaded easily on 40 meters, but that proved nothing. The Isotron Antenna. I will test the antenna the coming weeks, and hope propagation will go up. Empirical evidence seems to indicate that the antenna's not a cloud burner. Radioteletype is used frequently on this band as well. - Portable Vertical Antenna for 75m and 40m makes up a compact 28 feet high antenna. 15 dBi, or about 6 dB over a dipole. This coil came from a broadcast transmitter. 3), cut to a length of 468 (feet)/frequency. The larger the area of the loop the better it will work. In fact, let's go back to the beginning. The No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. Grafy vypadají nějak takto, u některých je vpravo uveden s azimut step = 10°: Z grafů je vidět, že lze snadno odečíst použitelnou hodnotu vyzařovacího úhlu antény. I had the same poor results with a properly installed K8UR system. If you've modeled your antenna, the model assumes a feedline that does not radiate. Lightweight (the 20 meter version is only 0.