I am working on my 80m and 40m CW transmitter and ran into a problem: I need to match the high impedance of PL504 to 50ohm coax, a Pi match seems to be the best, but I don't know how to calculate impedance transmitter amplifier antenna-tuner vacuum-tubes. The original Cobra antenna designed by W4JOH can be built as an all band hf antenna covering either 160 thru 10 meters or 80 thru 10 meters and is built using standard insulated wire of about 14 gauge and fed with 450 ohm ladder line down to the shack into a tuner. Frequency Devices 30 to 40 Meter Half Wave Dipole Antenna with Balun 30-40HWDB 1 offer from $51. The 1/2-wave 80-meter doublet with ladder line all the way to a 1:1 bifilar choke/balun in or near the tuner is a much better antenna for 80-10, provided you adjust the ladder line length to avoid the voltage and current anti-nodes (i. Normally 50 ohm coax, such as RG213 or RG58 is used as this provides a reasonable match. All information, images, and documents on this website are the sole property of MFJ Enterprises, Inc. 40m Linear-Loaded Dipole I stumbled-upon this antenna design whilst searching for something resonant, but not too lossy for 40m working. Zepp Antenna: For the 80m, 60m, and 40m bands I use a classic multiband Zepp antenna. 237 - Collinear Array 5dB-Gain for 15m. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. The resonance of the antenna wire needs to be checked with the antenna wire at its definitive height and location. This is a popular antenna design as the performance is very good across the HF bands and requires little. The antenna wire lengths before trimming are 5. For many ham radio operators, it is not feasible to put up a a full length dipole on HF. Extended Double Zepp – Longer than a dipole. This is an End-Fed Half-Wave (EFHW*) antenna for 40/20/15 and 10m bands. Each model resonates at the low end of the respective 160, 80 or 40m band: Part Number Length in Feet Band Coverage DXE-WA-260 260 160m to 10m DXE-WA-135 135 80m to 10m DXE-WA-70 70 40m to 10m Specifications All DX Engineering Multi-Band Dipole Antennas are usable from their lowest resonant frequency to 30MHz. Aug 20, 2014 · Mounted on a fibreglass pole the antenna merrily received aircraft non-directional beacons down in the 300kHz range – signals that were considerably weaker on my main doublet antenna. It will be feed with 50 ohm RG-8X having a 12 turn, 12 inch RF Choke and uses a K1FZ KB-5 toroid matching transformer. A further factor which influences antenna resonant length is the diameter of the wire used for that antenna. This will be the suspension point for the center of your doublet. Normally 50 ohm coax, such as RG213 or RG58 is used as this provides a reasonable match. My FTDX-1200 is connected to the doublet antenna via a LDG YT-1200 Auto tuner. While ON4UNs Low Band DXing and the ARRL Antenna Books are very fine resources, any serious antenna project needs to begin with Cebik's works which are available free of charge at the CEBIK. This is similar to a doublet, except the antenna is a continuous loop of wire instead of two separate elements. My 40m DX dilemma explained using MMANA software modelling and real-world experience to cure my problem of achieving DX to both USA and VK, ideally better than -5db gain at 5 degrees off the horizon. May 14, 2016 · From the balun it goes into a transceiver with internal tuner that is able to tune it on all bands from 40m up. 160m Inverted Delta Loop. Requires antenna tuner. The doublet antenna is a form of dipole that uses a balanced feeder, often open wire feeder and an antenna tuning unit. Longer lengths will start to produce the classic "butterfly wing. Dual-band Loop Antenna for 30m - 40m 37 de 45 ANTENNAS 61. or no tuning. Let’s examine the antenna pattern of a 40m dipole at various heights above average ground by first viewing the energy broadside to the antenna. 21 hours ago · download coaxial traps for multiband antennas free and unlimited. This will give you two 22-foot radiators for each side of your 44-foot doublet. 26 - Linearly Loaded Tee Antenna. To date my log is full of contacts with Europe on SSB as well as CW, Australia,South America and Oceania, the Ural and Caspian Sea area of Russia and finally the Middle East. They were cheap to make and I wouldn't be heartbroken if something happened to either. Another name for such an antenna might be an non-resonant doublet or dipole. Multiband Tuned Doublet Antenna 14 21. 160 METERS TOP BAND The Mid Atlantic group was founded in the Fall of 2007 by Eric WG3J and Nelson K3ABX and with the help of Joe N3IBX securing the frequency on 1900. 23 - Wideband Dipole for Receiving. The doublet is positioned such that the wires exist in the Y-plane and radiation is broadside towards the X-axis direction. Louis Doublet, that used small wire for the radiators and computer cable for the feedline. 3 4-band 20-17-15-10m COLA -G8ODE iss 1. Dipole antennas are very simple to construct and use and are very efficient if matched correctly at the feed point height. 177 - RCA Double Doublet for 40m to 12m. Use 75 or 50 ohm cable to feed the centre of the dipole. VSWR remains below 2:1 throughout the range of 160M to 10M. yes, it can, and it is good practice to break up feedlines to high dipoles to prevent their interaction with adjacent vertical antennas; a choke acts as an egg insulator. The 40 meter dipole was loaded with some coils so that I could fit it in the attic. Starting from the lowest band each dipole was tuned for resonance. The feeder line section tunes the antenna. The 80 Meter Doublet Antenna — 88 Ft/25Ft 300 Ohm Twin-lead. Green is the 15m long wire bicone antenna mounted in the loft Yellow is a 40m long doublet fed with 450 ohm ladder line and an auto-atu at the base Blue is the 40m long ladder line fed doublet strapped as a Tee and fed against 16 ground radials using an auto-atu at the base. Welcome to the new PackTenna web site. One separate dipole for each band. 26 - Linearly Loaded Tee Antenna. Jul 08, 2018 · One of the best general purpose, multiband HF antennas is the classic doublet fed by balanced feeders going into a balanced antenna "tuner. Just over 300 people responded. I added 30m and 80m quarter waves - the 80m one makes an inverted-L. To JA on the morning Short Path, the two antennas are the same. The spreaders can be made from any non-conductive material such as PVC conduit pipe or you can use ladder-line and make the whole lot from 1 piece of cable. I use a long rope to pull it up into position so that I can maintain it without climbing. Why 40? For several reasons: The antenna isn't really all that long, just 66 feet; The band is often open in. Test/Site Conditions for our Quarter Wave Sloper vs Inverted-V Dipole Because of the above stated variables we wanted to test these antennas over the. Mini-Horse Yagi Antenna. 88 ft and 44 ft are popular lengths. Soapbox: Varying Doppler on both bands for both the early and late runs. The 40M phone operators actually made more QSO's than the CW ops!. 2 KiB: 2016-Jul-20 22:33: 280-Veebeam. Efficiency drops rapidly with antennas shorter than 0. The range of these antennas starts at 30 megahertz with a maximum potential for 300 megahertz. WARC bands can be a bit sticky, but my MFJ tuners all seem to handle it, including the smaller portable model. Multiband Tuned Doublet Antenna. We usually use three counterpoise spaced at about six feet. The garden here at PZT Towers is 50ftx20ft so a full-length flat-top dipole/doublet to get me onto 7MHz was out of the question…. The benefit of this antenna over my existing 44' doublet fed with military 72Ω twinlead is that this antenna is made of continuous lengths of wire with no solder-joints to fail. The following program will calculate the lengths needed to construct several popular wire antennas. A Doublet (again, I'm speaking of "Doublet" as is generally understood. The end fed antenna works well in horizontal, sloper, and vertical configurations. The larger the wire, the wider the bandwidth. Double Extended Zepp NVIS Antenna Calculator. So that's all for now Update (11-20-2015) I originally only tested the antenna with my Ten-Tec C21 which had no WARC bands. 21 – G5RV Antenna. Coax feed line losses due to the SWR mismatch could result more than half your power being lost in the feed line. I carried out a survey in early 2014 to try to discover which portable HF antenna was most popular. I built this antenna and quickly tried it out in February of 2013. 2m/440 vertical. 26 - Linearly Loaded Tee Antenna. claims of up to 3 db gain over the “j” pole link to this is in references extended double zepp is simple to build, center fed antenna with 3db gain over a. G-Whip antenna products. Try the Mystery Antenna… the thing works and is a cool simple project. I am working on my 80m and 40m CW transmitter and ran into a problem: I need to match the high impedance of PL504 to 50ohm coax, a Pi match seems to be the best, but I don't know how to calculate impedance transmitter amplifier antenna-tuner vacuum-tubes. Using a tuner, they are usable to 30 MHz and come complete with the wire elements, ladder feedline, center T support, and end mount brackets. The difference between using Traps and just having a 40m Doublet, is that with traps on each band it's a resonant half-wave dipole, with the classic waveform. If we had chosen a 67' doublet, the antenna would be wavelengths on 40 meters, 1 wavelength on 20 meters, and 2 wavelengths on 10 meters. One separate dipole for each band. Wideband Dipole Antenna 15 23. 10m + 10m = Half Wave on 40m. I built this antenna and quickly tried it out in February of 2013. Why 40? For several reasons: The antenna isn't really all that long, just 66 feet; The band is often open in. The W3EDP/Z-11 antenna system is a viable all-band antenna system. 25 wavelengths at the highest frequency of operation. Its basically a 44-foot dipole made from speaker lead and does need a tuner. Use 75 or 50 ohm cable to feed the centre of the dipole. Antennas like G5RV's and Carolina Windom's have inherent RF issues. A 40m Doublet will have multiple lobes on the higher bands, with big peaks and nulls in different directions. I've never bought (or built) an antenna before and was looking for some general advice on what to buy (or build). In spite of the fact that I can't figure out how the FRI-match is supposed to work, I built one and am quite pleased with it. He says it is also possible to operate on both 80m (3. Starting from the lowest band each dipole was tuned for resonance. Doublet – Multi-band antenna that is not resonant on a particular band. My HF antenna is a Homemade doublet antenna with a flat top, mounted about 6M above ground level, fixed at the east and west ends of my garden. Gain is pretty decent around 6dBi at useful elevations (for NVIS contacts), it is an improvement over my previous dipole antenna, the 66 foot doublet. An all- band doublet shows a different feedpoint impedance at each frequency of operation. As open wire feeder is able to operate with levels of standing waves and effectively becomes part of the antenna, it is able to operate over a wide band of frequencies. Angle of slope maybe around 40 degrees. M0CVO claims it will operate on 40, 30, 20, 17, 15, 12 and 10m without an ATU (SWR <3:1) plus 6m with an ATU. The doublet has the advantage of not only multiple bands, but the lobe pattern is similar on each band. I have two such antennas: my home antenna is a 102' doublet fed with 300 ohm window line, and my portable antenna is an 88' doublet fed with 450 ohm window line. "This Old Dipole" or Dipole 101 An antenna construction workshop conducted at Marshall N1FN's QTH on Sunday, 8/2/98 Mission: Replace an old co-ax fed 40M dipole with a new one, fed with 300 Ohm ladder line and in doing so provide a "workshop" for the necessary techniques, and document the process for "posterity. May 12, 2015 · The antenna is simply a 44ft doublet fed by balanced line. You generally cut a doublet antenna to be a half wave long on the lowest frequency you plan to operate. VSWR remains below 2:1 throughout the range of 160M to 10M. Jan 08, 2015 · This antenna makes a very good transmitting wire for work on all bands from 160 to 10 meters in restricted locations, where longer wires are not possible. So far I had really not been active on 80 meters, due to antenna limitations and its perceived suitability for DX (I am not interested in local rag chewing ). Electrically it is very different to a conventional dipole; it incorporates a balun and is almost like having two quarter-wave dipoles connected side by side. The lengths at which the most dots line up vertically are the best choices for multi-band operation. 166 - Dual Band Ribbon J-Pole for 2m, 70cm. But, you say, dipoles are only single-band. Outstanding performance! Horizontally polarized for less local noise pickup plus solid gain over verticals will allow you to work DX easily -- even on QRP. Requires antenna tuner. If the unblock fails you will need to contact the server owner or hosting provider for further information. The Robin Hood Antenna 75p11 An Easy Triband Antenna 75p8 The Lowly Doublet - Or Is It? 70p17 A Simple Antenna Pole 68p16 (Postcript 69p13) Notes on A Simple Antenna Pole'' 71p17 Notes on Multi-Band Operation of a Single Antenna 58p18 Multi-Band Antenna Notes >On Display< 59p16 A Compact 80m Loop 74p8 The St. 80m Cobra Doublet This aerial is called, to use a technical term, an 80m Linear-Loaded Doublet - known in the USA as a "Cobra" due to the snaking of the wires. The configuration of the balanced line feeder is not important as long as it’s reasonably low-loss. 40M was stronger for the early run (100uV vs 20 uV on 80M), but 80M was stronger for the late run (10 uV on 40M vs 100 uV on 80M). I got lucky today! I had been wanting to try a first time activation for Mount Mingus W4T/SU-008. The antennas were 124 feet long. We're talking about "reasonable" heights on a given band as discussed in the antenna literature. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. Usable NVIS service occurs from 6 to 24 feet above ground with energy directed. height AGL. Using a tuner, they are usable to 30 MHz and come complete with the wire elements, ladder feedline, center T support, and end mount brackets. small loop antenna array for hf reception - kk5jy. • Propagation variable, signals often not very strong, heavy QRN during the summer. CQWW SSB is just a week away as I write this. 22 Different Wire Antennas for 160m compilation by TopbandHams Off-Center-Fed Full-Wave Doublet Antenna. * Band coverage depends on location of the antenna, the use of a wide range tuner and the appropriate DX Engineering balun designed for use with an antenna tuner. A 40m Doublet will have multiple lobes on the higher bands, with big peaks and nulls in different directions. Regional Communications Needs • 400 mile radius NVIS 40M antenna. 159 - Multiband Vertical Antenna for 80m, 40m, 20m. 5 MHz) and 60m (5 MHz) via a good ATU, although the performance will be down. Built to the usual TET-EMTRON quality, the. W2SH and K4BAI were two-banders for me. A shortened multi-band End-Fed Half Wave (EFHW) antenna for 80-10m Steve Nichols G0KYA A shortened multiband antenna, about 23m long, for 80m-10m that offers low SWR (1. The best antenna I have built was a 40m elevated ground plane. May 12, 2015 · The antenna is simply a 44ft doublet fed by balanced line. I carried out a survey in early 2014 to try to discover which portable HF antenna was most popular. We're talking about "reasonable" heights on a given band as discussed in the antenna literature. Dipole antenna basics Current & voltage Half wave dipole Folded dipole Short dipole Doublet Dipole length Dipole feeds Radiation pattern Build HF ham dipole Inverted V dipole FM dipole design The inverted V dipole can form an effective antenna system for use on the HF amateur radio bands, or for other applications in many circumstances. Either of these may be added to your existing antenna system. Cebik, W4RNL 1434 High Mesa Drive Knoxville, TN 37938-4443 e-mail: [email protected] The doublet has the advantage of not only multiple bands, but the lobe pattern is similar on each band. An effective radiator since the beginning of the hobby, this antenna is really just a dipole, as described above, but fed with open-wire feedline, ladder line, or window line—feedline in which the two conductors are kept the same distance apart from antenna to shack. 236 - Dual Band V-dipole for 80m, 40m. Parts of the antenna setup in the garden … An overview of the setup in the garden - height of the (2x 40m) doublet is about 10m above ground-level. Antenna Parts Balun Designs - Baluns Bozak. I say fantastic only because when you compare the height requirements and maintenance requirements, the phased array has tremendous bang for the buck. Any reuse or redistribution of the contents of this website are strictly forbidden without authorization from MFJ Enterprises, Inc. This could be 50 ohm types such as RG58, RG8X, RG8, RG213, or 75 ohm type such as RG11, RG59, RG6 or even 75 ohm twin lead. They've usually read enough about what happens to patterns to understand that putting the legs in different positions will affect how the antennas perform. 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. This antenna is only 7. Nov 22, 2017 · 22 Different Wire Antennas for 160m compilation by TopbandHams Off-Center-Fed Full-Wave Doublet Antenna. That said, my impression of the antenna at this height (26ft/8m) and in this particular configuration (that is, a vertical dipole) was that its good radiator, but the angle of radiation is not suitable for the long haul DX. I run the loop into the RX only antenna input on my TS-590 so the RX input is disabled when transmitting. 22 Different Wire Antennas for 160m compilation by TopbandHams Off-Center-Fed Full-Wave Doublet Antenna. Dual-band Loop Antenna for 30m - 40m 37 de 45 ANTENNAS 61. However, enjoyed the time I had. K9GDF - Antenna is rain gutter and downspouts. The NorCal Doublet Antenna came about due to my desire for a simple antenna that could be erected very fast, only needed one center support, and did not take up much storage room. The Wire Size can range from 16 AWG to 12 AWG. It covers the full 40m band and most of 80m without a tuner when fed with 50 ohm coax. Just a Dipole Gary Wescom N0GW July 16, 2007 Often we will hear people describing their antennas as ‘just a dipole’. Think about a mobile antenna for HF, setup a portable HF longwire, make a 70cm jpole, this time with twin lead, get a laptop or UDOO/Raspi running Linux for field use. Use 75 or 50 ohm cable to feed the centre of the dipole. Linear Loaded Short Ham Antennas. 160m Inverted Delta Loop. Specifications All DX Engineering Multi-Band Dipole Antennas are built using the highest quality components. It has been a satisfactory antenna. By feeding the antenna at this point it provides a low impedance feed and a good match to your coax. The half-wave dipole is very simple to construct. Doublet Antenna. It arrived within two days of ordering. The entire kit, including the large numeral 4:1 RF transformer/balun, arrived in 2 large boxes. 160 m loop on 80, 80 m loop on 40, 20 m loop on 10, etc. I am hoping to get up a dedicated 40m dipole up for this contest and hope it will provide some useful contacts on 40m the the 80 doublet does not. erful antenna modeling software. USA-built by Granite State Antenna of Northwood, NH by people who answer the phone. 3 4-band 20-17-15-10m COLA -G8ODE iss 1. Jan 25, 2013 · HF Antenna: All Band Doublet Another thing that I did over the Dec/Jan holidays was finally get an HF antenna back on the air, hanging from the south outrigger on my combination TV / Ham tower. 26 - Linearly Loaded Tee Antenna. Thursday, August 22, 2013 The Bent Dipole or Inverted "U" antenna. Nov 04, 2018 · The 40m QCX kit will be my first HF station. The inverted Vee antenna will be shorter by 2 – 5% depending on the angle from horizontal. The classic 135 doublet antenna fed with ladder line comes to mind. "This Old Dipole" or Dipole 101 An antenna construction workshop conducted at Marshall N1FN's QTH on Sunday, 8/2/98 Mission: Replace an old co-ax fed 40M dipole with a new one, fed with 300 Ohm ladder line and in doing so provide a "workshop" for the necessary techniques, and document the process for "posterity. speaker wire. Aug 22, 2013 · A Hawaii-based Amateur Radio Antenna Blog focusing on the theory, design, and use of homemade antennas. This does NOT take into consideration the type or size of horizontal reflectors, of even if there is a need for them. 5 MHz) and 60m (5 MHz) via a good ATU, although the performance will be down. Small hf antenna download small hf antenna free and unlimited. Multiband Z Antenna 33 55. The G5RV's problem is mismatch and going from balanced to unbalanced, and the Carolina Windom's problem is it is inherently unbalanced from top to bottom with mismatch as well. 5 m between balun and 20m trap, 5. Since the azimuth lobes are functions of the wire length in wavelengths, we would obtain different lobe patterns than for the 135' wire. It supports 7 bands, 10m-40m via tuning of the lengths of tubing and some loading coils on certain bands. HORIZONTAL LOOP ANTENNA CONSTRUCTION. HF Antenna Next Steps In order to improve my HF antenna I plan to double its length so that I can use it more successfully on the 40m band. 90-110' (works second best on 80 meters, with good results on all other bands). Again, the tuner easily tuned the antenna on all the bands tested and QSOs were successfully made on 20m and 40m despite poor band conditions. There for if you can have only one HF antenna the random length all band doublet would be a pretty good choice. endfedz® overview lnr precision. The 1/2-wave 80-meter doublet with ladder line all the way to a 1:1 bifilar choke/balun in or near the tuner is a much better antenna for 80-10, provided you adjust the ladder line length to avoid the voltage and current anti-nodes (i. 162 - Stub-Directed V Antenna for 80m. The antennas were separated vertically in the center by a 24" Plexiglas Lexan spreader, feed at the bottom with a DX Engineering DXE-BAL050-H05-A Balun. 25 thoughts on " How to construct a multi-band dipole using speaker wire " Reply Stephen Dec 31,2013 19:14 Made this and installed today although not pinned up the 20m/40m wires yet. It's just a different way of installing the quarter-wave vertical. It will be feed with 50 ohm RG-8X having a 12 turn, 12 inch RF Choke and uses a K1FZ KB-5 toroid matching transformer. Loft and Attic antennas for restricted places. 80m overall length - 134' or 67' per side. This antenna was built with standard 12 gage electrical wire. Jun 24, 2004 · 40m ‘Standard’ half-wave Dipole Antenna (2nd HF antenna project) My 40m coaxial dipole antenna worked surprisingly well, considering how many compromises it was dealing with. The JK401 is a simple Hi-Q coil loaded rotatable dipole, with a small footprint as well giving great performance on 40M. " This is essentially a dipole cut for the lowest frequency of interest and fed with ladder line. G3RWF Doublet -40m antenna wire only 18m apex & slopes to 15m - base line of dipole impedances The MMANA-GAL model results shown that the resistance alternates between low and high values, and the reactance similarly changes between inductive and capacitive values as the. Bandwidth: The B-Square Engineering Terminated Folded Dipole provides complete coverage of any frequency from 1. Cebik - W4RNL. In total, it's around 18m of wire per leg folded 3 times and fed with 300-ohm balanced feeder. Cebik, W4RNL 1434 High Mesa Drive Knoxville, TN 37938-4443 e-mail: [email protected] 128 - 5-Element Log-Periodic Vertical Antenna for 80m, 40m, 20m. Dipole antenna basics Current & voltage Half wave dipole Folded dipole Short dipole Doublet Dipole length Dipole feeds Radiation pattern Build HF ham dipole Inverted V dipole FM dipole design The inverted V dipole can form an effective antenna system for use on the HF amateur radio bands, or for other applications in many circumstances. 29 - Delta Loop Antenna. 33ft Verticals and Ununs. Base Antenna Wire 40m/15m Learn More. I say fantastic only because when you compare the height requirements and maintenance requirements, the phased array has tremendous bang for the buck. Jun 24, 2004 · 40m ‘Standard’ half-wave Dipole Antenna (2nd HF antenna project) My 40m coaxial dipole antenna worked surprisingly well, considering how many compromises it was dealing with. Doublet My first antenna was a simple non-resonant doublet, as suggested for a KX-1 by Bob NW8L: I use a simple doublet made from 64 ft. 176 - Dual Band Vertical with Zepp Feeders for 40m, 20m. Designed for horizontal or inverted "V" installations, it is rated at full legal power. The connection is a bit different from the usual description in the manual which focuses on unbalanced feed lines. 235 - Phased Delta Loop Array for 20m. Call sign CF3SZ, which is a special event call sign celebrating their 150th anniversary. Diamond ® Antennas are sold through authorized dealers. VSWR remains below 2:1 throughout the range of 160M to 10M. Oct 20, 2011 · Doublet Dipole Antenna. To support an antenna, I have no tower, and only two trees that aren’t too close to a house. I use a long rope to pull it up into position so that I can maintain it without climbing. 5 m between balun and 20m trap, 5. It's all about tradeoffs and there's no free lunch. Wire Antennas for Ham Radio Multiband Tuned Doublet Antenna. The larger the wire, the wider the bandwidth. The garden here at PZT Towers is 50ftx20ft so a full-length flat-top dipole/doublet to get me onto 7MHz was out of the question…. Regional Communications Needs • 400 mile radius NVIS 40M antenna. The extra length needed to make the antenna "work" on 80 Meters could be suspend from each branch, with most of the length going from tree to tree. the no-tuner, all-hf-band, horizontal, center-fed antenna is our old friend, the 80 meter. org The … K6MYC on Antenna Testing. It can be fed with ladder line from the center insulator to tuner or it can use an impedance. Call sign CF3SZ, which is a special event call sign celebrating their 150th anniversary. He's used this design for the 40m elements of a fan dipole covering the 40m, 20m, 15m, and 12m bands. HF loop antennas. Tri-band Delta Loop Antenna for 80m - 40m - 30m 36 de 45 ANTENNAS 60. The 30M received signals were down 1 s unit, but the QRN levels dropped to s2 to s3. During the PACC 2013 I used this antenna for 160 meters. The dipole is any one of a class of antennas producing a radiation pattern approximating that of an elementary electric dipole with a radiating structure supporting a line current so energized that the current has only one node at each end. I purchased the 160-10 meter version of the W7FG doublet along with 700 feet(!) of open wire line. 1 - 40m dipole broadside gain patterns vs. That might be due to using ladder line, but it could also be that the coax I was using with the dipole was starting to deteriorate. Search Results for MULTI BAND VHF HF BASE. Tilted Folded Dipole Antenna 16 25. All-Bands Dipole Antenna 32 54. The Half Square antenna is a wire antenna with two vertical radiators fed in phase. This is a popular antenna design as the performance is very good across the HF bands and requires little or no tuning. Both are made of Radio Shack speaker wire. 128 – 5-Element Log-Periodic Vertical Antenna for 80m, 40m, 20m. I seem to get requests from time to time, to bring up this topic on the blog. Stayed on 40M all sprint. The antenna has given me excellent results on the bands and it really shines on 10m where it is a full wave vertical dipole. I built this antenna and quickly tried it out in February of 2013. Although the doublet worked fine, it was a challenge to put up by myself in a high wind. I kept hearing all these great things about the G5RV, but I remained unconvinced. 160 - Marconi Antenna for 136 kHz. 21 - G5RV Antenna. G3RWF Doublet -40m antenna wire only 18m apex & slopes to 15m - base line of dipole impedances The MMANA-GAL model results shown that the resistance alternates between low and high values, and the reactance similarly changes between inductive and capacitive values as the. These branches would make a suitable support for an 80-10 Meter half-wave doublet or flat-top dipole. 163 - KT0NY Over-and-Under DX Antenna for 20m. It is full length 10m - 20m and there is some loading for 30m & 40m. 736m, or 25. The doublet has a long history and its longevity is perhaps down to two factors: ease of construction and its being an effective multi-band radiator. 90 feet matches the antenna on about 7. Yep, and I recommend the 40m band. I've put up an open wire fed "doublet" antenna for 40m and of course all bands up from that. On a whim I "auto-tuned" the doublet to 30M. So that's all for now Update (11-20-2015) I originally only tested the antenna with my Ten-Tec C21 which had no WARC bands. I’ve not tried more than 3 wires, but if access to 160m was required, you could try a 4th+5th wire. 160m Inverted Delta Loop. With the Elecraft T1 Tuner I can tune the antenna on 80 - even though it's not supposed to work, and I can hear stations all over the UK. The 40M Extended Double Zepp By Jim Streible, K4DLI There were many new and somewhat unfamiliar antennas used at this year’s NFARL Field Day. • There is no special length for a G5RV; it only needs to. Thursday, August 22, 2013 The Bent Dipole or Inverted "U" antenna. 130) but elsewhere requires the ATU. But, you say, dipoles are only single-band. Shop by Brands, Shop by Manufacturers. You should glance at Yahoo’s home page and note how they create post titles to grab viewers interested. However it's performance was best on the higher bands and on 40m never achieved a reasonable SWR without an ATU to help. The model uses copper wire 2mm diam, the antenna height is 8m above real ground (5mS/m and dielectric 13) SWR ref 200Ω Graphics by G8ODE June 2012 iss 1. Regional Communications Needs • 400 mile radius NVIS 40M antenna. If you want to use a dipole for a band of frequencies, you cut it to the center frequency on that band, and hope it has a low enough SWR at each end of the band. Given time, many approaches in the Antenna Book would be well worth a try. COM web site. The Near Vertical Incident Skywave (NVIS) antenna is a half-wave dipole antenna mounted not over 1/8th wave above ground (at the highest operating frequency). The doublet is positioned such that the wires exist in the Y-plane and radiation is broadside towards the X-axis direction. It is full length 10m - 20m and there is some loading for 30m & 40m. 165 - Ribbon J-Pole for 2m. Some TIPS on measuring VSWR and troubleshooting M2 … Antenna Gain: dBi vs. I run the loop into the RX only antenna input on my TS-590 so the RX input is disabled when transmitting. Cebik, W4RNL 1434 High Mesa Drive Knoxville, TN 37938-4443 e-mail: [email protected] Off-Center-Fed Full-Wave Doublet Antenna. 2 m (26 ft) element at boom location Z. –Using copper tubing open line for matching –Appeared in the December 1935 ‘Collins Signal’ –Also in The Radio Antenna Handbook -- 1936 –Also in The Frank C. 9 feet long and the twin lead is 31 feet long. Thanks to all 73 Dick WB4BIN - Fun sprint! 20m was in pretty good shape tonight, and my dipole was working well there. 231 - Sloping Delta Loop Antenna for 40m. One separate dipole for each band. Or, if you are ready to purchase, see the How To Order page. Jan 25, 2013 · HF Antenna: All Band Doublet Another thing that I did over the Dec/Jan holidays was finally get an HF antenna back on the air, hanging from the south outrigger on my combination TV / Ham tower. I use my 40M modified half-square (nominally an 80M dipole at 65ft height with some vertical elements) for receive and the L for transmit and it is a formidable combination. Of course, it requires a good radial system to work well, but it will work a lot better for DX than a low doublet or dipole. Okay, as I noted before, my first antenna wasn’t a dipole. My first thought was to remove the balun from my 40m dipole, feed with ladder line from an external auto-ATU and treat as a doublet. Wideband Dipole Antenna 15 23. In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna. To ZS on the evening Short Path, the DV-40-P there is no contest. Here is a graph of the optimum lengths of VF=0. 160/80/40m Receive Antenna Planned for the for the spring of 2004 is a rotatable Flag type Pennant receive only antenna. One of these was the one for the CW station. We're talking about "reasonable" heights on a given band as discussed in the antenna literature. performance of nearby vertical antennas at least 125-250 feet away from all nearby towers and antennas significant antenna pattern degradation increased ground losses tower detuning is possible but it's a complex task Horizontally polarized transmitting antennas are almost always a poor choice for 160 meter DX. This should give you basically the same basic antenna pattern on all bands, 10-40M. • It was used as a multi-band antenna because when fed with ladder line (not coax!) it is easy to match the on any band from 80m to 10m • A G5RV used as a multi-band antenna should be fed with ladder line.