Wire Antennas For Limited Space Jim Brown K9YC • 40 Meters – No significant • A Dipole in free space is a 72 ohm antenna!. That is about as high as most of us will ever deploy an antenna. • Our regular antennas work by "recieving" the electric field portion of the radio wave. Test Results for the Sloper vs Inverted-V Dipole on 80/40 meters Slopers are generally known to be good low angle DX antennas, while the inverted-V dipole is generally known to respond to higher angle, regional type signals. The basic 40 meter quarter wave vertical antenna is 33′ tall and requires a reasonably good ground or counterpoise system to function properly. Modeling this 160 meter inverted-L in EZNEC shows surprisingly useful patterns and gain on most HF bands above 160. 20 meter vertical antenna projects is a curation of 11 resources about , Vertical moxon for 14 Mhz, 20m T-Monopole, 20 Meter Jpole Vertical, The ground image vertical antenna, Dual Band vertical antenna for 20/40. 40m-10m DELTA LOOP ANTENNA - GU3WHN At 7 MHz the full wave loop is resonant – and with the 4:1 balun produces a SWR of 1:1. There are numerous reasons why people shy away from trying to put up a good antenna for this band:. After installing the antenna, measure the SWR to find the resonance of the antenna and note it. satiIe antennas were developed for the Ham with a limited budget, limited space and the traveler who warks portable. The antenna is powered through coax, so no external wiring is needed. com is an initiative o. Small HF Antennas — Shortened doublet designs for 30m / 10. , a 2-meter vertical, a 40-10 Meter Off Center Fed. This material is good because it is an insulator and is also made to be UV light resistant. I will first describe the basic 3-DFL and then provide construction details for the 2-meter and 10-meter 3-DFL antennas. The diagram above depicts the 17 and 20 meter delta loops setup at my QTH. A so-called random wire antenna is an end fed antenna. It also does a great job on 20 and 17 meters, using the antenna tuner. Then, connect the antenna to the transceiver on minimal power and tune the antenna for maximum radiation by means of a field strength meter. I came up with an antenna that extended only 1. Results depend on the height of the wire above ground. Windom Antenna 6 7. 1 uH shunt coil and a 120 pf series capacitor. One side of the antenna (wire) goes up the 11 meter fiberglass pole and from the top towards the house. 4-Band antennas cover 40, 20, 10, and 6 meters, with no tuner required! 12 meters may also work on the 4-Band 300 watt model. The end fed antenna is essentially half a dipole, it uses a good earth connection to complete the arraignment. Review: Superloop III Antenna by RadioWorks (Now called the Superloop 80) by Dick Stevens, N1RCT (Originally appeared in Nov. By John Portune W6NBC. antenna parameters to validate the proposed antenna in the smart energy meter environment. 65 USD - 79. The 40 Meter Isotron Antenna. Low profile operating -- SMALL LOOP ANTENNAS. The 20 and 15 meter dipoles worked fine with VSWR under 2:1 across the band. assumes a small source in a free-space frequency range 1 GHz to 40 GHz. Auto-Deploy Antennas; Satellite Networking Services; Mobile Installation Services; Portable. If you use an SWR meter or an analyzer at the base of the antenna you will get the most accurate readings in a timely fashion. So I narrowed it down to a simple half-size 2-element "Yagi". com For immediate release to the ham radio public 03/01/10 TAK-tenna is now patented! Patent number 7586462 (Note: This review was originally done in May, 2007 when the TAK-tenna first came out. The OCFD has a very low SWR on 40. With these values the tuner will cover 30 meters with a 46-foot antenna or 40 meters with one about 67 feet long. Thus, I choose to use a separate 15 meter dipole even with the potential interaction between the antennas. K5LAD's Assorted Ham Stuff "I can’t work 80 meters, I don’t have a good 80 meter antenna" How many hams have made a statement like the title of this piece? Quite a few, I’d be willing to bet. Hoppe,1 and M. Wire Antenna for 75 and 80 Meters — From Ross W1HBQ. 80/40 Meter Attic Antena. 10-40 Meter Tac-Tenna For SaleSmall vertical or horizontal mounted tuned antenna for space-challenged areas. However, you can use a magnetic loop antenna that is only 3 feet across yet cab be very effective, sometimes even MORE effective than the wire, when you have limited space! For this test, I operated from INSIDE of the house. One way to do this is to use the linear loaded koncept. 40m-10m DELTA LOOP ANTENNA - GU3WHN At 7 MHz the full wave loop is resonant – and with the 4:1 balun produces a SWR of 1:1. Below is one example of how to mount a 20 metre delta loop on a small suburban house. In October 2012 I changed my 160 meter transmitting antenna to an Inverted L with FCP (folded counter poise). Features mostly omni-directional pattern. EWE Antenna 9 12. Boom = 30 in/76cm; sprial radiating element = 30 in/76 cm diameter; weight = 4 Lbs/1,8Kg. If a directional antenna is used, it will need to be correctly aligned so it is pointing toward the TV stations you are trying to watch. This is the length of a standard. It will work all of the 40 meter band plus a portion of the 80 and 160 meter bands. Then the antenna mast I installed as a replacement fell down in a snow storm. However, we can reduce the space needed to a quarter wavelength if we decide to use an end fed antenna. 80m vertical antenna. One end goes straight into the rig, often with no feedline, and the other end in the air attached to something as high as you can find. Like all inverted vees, it requires a single center support, which is often times a tower which is topped with a Yagi or quad for the upper bands. 00 three-resonator adapter plate. some HF antennas that require less space. 4-Band antennas cover 40, 20, 10, and 6 meters, with no tuner required! 12 meters may also work on the 4-Band 300 watt model. I'll be installing an omni-directional vertical for 2m/1. A 40 Meter Vertical Antenna for Small Spaces This antenna offers good performance in a compact footprint. It is small enough to fit inside the attic of many homes. The four bands planned are 80 meters, 40 meters, 20 meters, and 10 meters. 80/40 Meter Attic Antena. net list, February 12, 2000 I've had my homebrew K9AY loop up now for 2 weeks, and decided it was time to pry myself away from the radio to share my results and impressions thus far. I would love to have a full sized 160 Meter loop antenna; but this postage sized New Jersey suburban lot just does not allow for it. The 10 meter antenna however, was very narrow. The first (and most important) goal was to get the FULL 40 meter band at less than 1. Meter SMALL HF MAG-LOOP & ANTENNA TUNER (40m-17m) NOTES of being more suitable for portable work because it packs away into a smaller space. While fussing over just what to do I thought I would give a 40 meter Windom (the more traditional off center fed antenna design) and have been very please with it’s operation. The antenna has five elements on a 64″ boom. 84 feet If B = 0. I Cheap products from ® TP-LINK Shop Online 15. Figure 1 gives us the most important reason for using the full length of 80 or 40 meter antennas on higher bands where antenna length becomes long. If you use an SWR meter or an analyzer at the base of the antenna you will get the most accurate readings in a timely fashion. This can be derived from the principle of detailed balance, which applies for reciprocal antenna structures. My antenna is hung off the side of my 40 foot tower as a sloping dipole. Tune ability to resonance at a specific frequency across the entire 10-80 or 10-160 meter bands. Add you loop wire of choice and your coax cable for rig connection, and enjoy DXIt consists of: Custom designed Air core transformer using 12g stranded wire. These deviations to guidelines are a product of early mistakes in usage that are now accepted as correct for the purpose of continuity of that particular band. I have 50 feet of RG-8X coax cable ran from the antenna to my Yaesu radio. By using 450 ohms ladder lines as stubs the construction is a piece of a cake. I came up with an antenna that extended only 1. It was a couple of years ago that we first heard about the ANYmal, a quadruped robot developed by ETH Zurich spin-off ANYbotics. Let's review some of. No room for radials, let alone big antennas! John Portune, W6NBC. For condo windows, hotel balconies, and other space-limited locations, we use the loop in the horizontal position, which (of course) gives vertical polarization and an omni directional radiating pattern. This design was chosen because of the simplicity, ease of construction and operation. We "fired up" EZNEC+ v. This is something you should always bear in mind when considering your options for low profile or hidden antennas. 80/40 Meter Attic Antena. * Small footprint -- 11-foot turning radius fits cramped spaces. A random wire is a compromise portable antenna. 80 and 160m. Zeppelin Antenna 8 11. The old Radio Shack HTX-202 I have has sixteen memory channels, and I've filled all of them with repeaters, with more repeaters than memory space for them in the '202s. STACKING ANTENNAS. tenna that Cushcraft was introducing. into a rucksack. I have purchased one, and the construction is superb. Looking at the same antenna with conventional feed we have: We have identical 40 meter gain, about 2. 5/5click here to see their performance reports. In the evening hours on 40 m, the antenna was "too good", because the commercial broadcast stations came in so strong that I only heard cross modulation signals, and hardly any signals from amateur stations. The length of the 50Ω coax may help or hinder a match. Wire Antennas For Limited Space Jim Brown K9YC • 40 Meters – No significant • A Dipole in free space is a 72 ohm antenna!. A lot of different small or electrically shortned antenna models are available but they. 9 USD - 14 EUR - Review 2019 Cable Pigtail WIFI converter of N to SMA RP-SMA. Update August 16 2014 - Th e past few weeks I have been playing around with a 40 meter OCFD at around 33 feet. Home Entertainment Center: TVs, Stereos, VCRs, DVDs/BluRay and Media Players - OTA antenna set up?? - I want to do away with my cable bill and satellite bill. The TAK-tenna(TM) by Don Butler, N4UJW Hamuniverse. Working 160M From a Small Lot (and Larger Ones Too) antenna in the center of open space with a 100 ft radius. This antenna is a plumbers dream. A half wave dipole on an 80m is about 130 feet or 40 meters long. I have purchased one, and the construction is superb. Random Length Radiator Wire Antenna 6 6. 80m vertical antenna. Its smaller size increases communications opportunities for many hams who have been restricted by a lack of space to grow antennas. I have a small city lot with some HOA restrictions. Short Dipole for 80M — From 4S7NR. This break-through antenna was designed by Dr. The best part of this antenna is that when transmitting, the antenna loads well at EVERY harmonic- the 3. I used a 4" PVC pipe coupler cut in half, so I could make another one later. The article provides SWR graphics to show the performance of this unique antenna. When space and strong antenna supports are available my 75/40 meter Folded Skeleton Sleeve Dipole makes for an excellent EMCOMM. It works just fine and dandy on 20 meters as well but I'd rather have a dedicated 20 meter loop for 20 through 10 meters. I used up two quarter mile rolls of electric fence wire. Small Five-Element Yagi. Add you loop wire of choice and your coax cable for rig connection, and enjoy DXIt consists of: Custom designed Air core transformer using 12g stranded wire. This works "ok" but not great. The ability to tune on any specific frequency in the 7 -50 MHz (40-6 mtr) range with utmost perfomances, soon will make this 3el Yagi antenna as a real UltraBeam "queen". To remedy the narrow bandwidth I used a bowtie dipole antenna for 10 meters. The basic 40 meter quarter wave vertical antenna is 33′ tall and requires a reasonably good ground or counterpoise system to function properly. The antenna is probably too long. The ability to transmit of multiple bands without needing a tuner (and even more with a tuner) is a very desirable factor in choosing a versitle antenna for HF. I have a small city lot with some HOA restrictions. It is only sixteen feet in length, which makes it much more reasonable for temporary installations. By John Portune W6NBC. 30 - 12 metres. 5 (no need for an atu). HF Antenna #3 – Folded Skeleton Sleeve Dipole. Home Entertainment Center: TVs, Stereos, VCRs, DVDs/BluRay and Media Players - OTA antenna set up?? - I want to do away with my cable bill and satellite bill. The crowded space above the set required a compact multi-band dipole, and the CHV-5X was selected to solve the problem the minimal space presented. o Great Signal o Small Footprint o Easy to Install o on 30 boom o free classifed ads used surplus electronics. It is assumed, without knowing, this rise in SWR is attributable to the antenna's proximity to the roof and the metal gutters surrounding it, and its proximity to a nearby 50 foot galvanized steel push-up mast which holds three other antennas, viz. 62GHz), covering the proposed bandwidth (2. Let me state this up front, this is not an antenna project for the faint of heart, nor does it describe an all band, miracle working, coax fed multi DX pile up buster. Distance from center of antenna to the center of the coil in feet (Must be less than half the total antenna length given above). Multiband Dipole Antenna 10 14. The end fed antenna is essentially half a dipole, it uses a good earth connection to complete the arraignment. The 40 Meter Isotron Antenna. These antennas give excellent results where space is at a premium. diagram, an antenna rotator is required for maximum antenna gain in a specific direction. - Assembled in 20 minutes by two persons. Felipe Valle. The operation on the historic. 5, and Hi-Q-3 antennas. This is not another article about small 40 meters antennas. Choose from top-brand HF Yagi, HEXX beam, and other rotatable antennas to meet your high-frequency needs. Since space structures are vulnerable to damage from micrometeoroid and orbital debris, it is important to investigate means of detecting. 5′ for the sides and 20′ for the height. My search led me to two or three possibili - ties, and the one that seemed to be the KIO Technology Broadband Hexagonal Beam Antenna Bottom Line. On 40 meters, for example, a¼-wavelength vertical antenna is a metal tube or wire 33 feet high. shortened wide-band dipole for 40 meters. Read the instructions before cutting them. A 1/4 wave antenna then would be an antenna with an electrical length one-fourth of the actual signal's wavelength. 40 meter Delta Loop Joe on 21st Oct 2016 I recently purchase a 40 meter Delta Loop from Chris and received the antenna few days later after the purchase, I hung up the antenna in less than one hour in configuration, C , I hook up my antenna analyzer after the installation and I was Very surprise is flat 1:1 on the entire 40 meter band, 20 meter was about 1:2 on the top edge of the band and the. I have used a griddip meter to adjust the lengths of the stubs to obtain the demanded frequency. If you have a small patch of land to provide an earth ground, and if you can get one end of a wire secured at about 25-30 feet off the ground, you can construct your own custom solution. Figure 1 — My small mobile home. I’ve been evaluating options for a low noise receive antenna for 160 meters. I came up with an antenna that extended only 1. The article provides SWR graphics to show the performance of this unique antenna. In 2009 I acquired and installed a 55 ft. But when you are limited in space, you have to find another solution and is the Super Bazooka an acceptable alternative. Admitting, the S-meter never went below S7, the base noise and QRM level was rather high. o Great Signal o Small Footprint o Easy to Install o on 30 boom o free classifed ads used surplus electronics. I knew that this would be my only decent 40 meter antenna, for now, and had the wire and the low traffic space, so I chose to do the minimum recommended "wires on the ground" thing. While fussing over just what to do I thought I would give a 40 meter Windom (the more traditional off center fed antenna design) and have been very please with it’s operation. For example, a dipole antenna for the 80 meter band requires a ground length of about 140 feet (43 m) from end to end. Although this design has been around for a long time, it is only gaining popularity now due to the recent improvement in high power antenna tuners. February 19, 2015 TVARC Antenna Guide for The Villages 3 Small Antennas are a Compromise Stealth Antennas are a Compromise Multiband Antennas are a Compromise Pick one from the list below; • You can make an HF antenna physically small • You can make an HF antenna radiate efficientlyat low angles. Imbriale,1 S. Question, hopefully OP would not mind. I thought about doing any of 3 things: 1. If you live in a space restricted location or are under a HOA restriction, you may be able to mount an antenna outside. If you want 75 Meter operation make it 57 ft long. Right now I have a double bazooka 40 meter dipole up along the back block fence in an inverted v configuration. When spaced 3 meters the interactions were modest, even on 10 meters where there is a resonance on the 40 meter yagi. Page 4 PRB-1 Historical Background (Editorial Comment) At the time of this writing, the legal situation of amateur antenna installation is very much in a quandary On the one hand, our CCR's. JK Antennas can meet your needs with a wide range of Ham Radio, Amateur Radio HF Antennas, including Monoband, Dualband, Tribander, Multiband, operating on frequencies from 6M to 80M. In other words, this was a grand day to build antennas. Install at least 30-60 shallow buried 125. Continuous innovation is needed to develop antennas with a low profile, less weight, low power consumption, and decreased costs. With the right antenna design you'll be on the air today! Fully updated, the second edition of ARRL's Small Antennas for Small Spaces is a valuable resource for radio amateurs who live in apartments, condominiums, or houses on small lots. 10-40 Meter Tac-Tenna For SaleSmall vertical or horizontal mounted tuned antenna for space-challenged areas. I needed a lightweight, small turning radius antenna, with good performance on the five bands from 20 through 10 meters, that could be easily adjusted for best performance after assembly. When space is limited one has to design and build shortened antenna. Stealth Antennas (RSGB) 3. On 10 meters the gain reduction is closer to -0. A second loop, which is one fifth of the diameter of the large. MFJ-1984MP ENDFED 10 thru 40 meter antenna. The lower bands (80 and 40) want around 100 ohm, 30 and 20 want a 200 ohm feedpoint and 17 through 10 meters would be happiest with a 300 ohm feedpoint. In 2009 I acquired and installed a 55 ft. When spaced 3 meters the interactions were modest, even on 10 meters where there is a resonance on the 40 meter yagi. This works "ok" but not great. My most recent antenna for top band was an odd shaped 160 meter full wave length loop. In order to select the better. 1 MHz and 20m / 14 MHz Squeezing the antennas into 3 meters or 9. Small CB Radio Antennas. One choice out of many is the fan dipole. ARRL's Small Antennas for Small Spaces - Kindle edition by ARRL Inc. The ones in the direction of Europe and North Africa and the Middle East are up to 700 ft long. Also covers 30-17 & 12 meters with an antenna tuner. Internet Instruction Sheet. The half-wave length dipole fed with 450-ohm feedline (the classic "doublet") is a basic antenna that will give you hours of enjoyment and plenty of DX if the flat top is at least 30 to 50 feet (9. After trimming, the 80 meter elements were about 4 feet long for a total antenna span of about 76. Highly technical presentation on small antennas All sorts of small antennas - they are better than you think - heuristics shows why! By Professor Mike Underhill - G3LHZ. ground plane antenna with radials. Evolving from a simple end-fed Marconi for 80m, the idea was to use the opposing. Portable antenna systems for HF VHF UHF. Two 1/4 wave ham sticks in a dipole configuration produce a 1/2 wave dipole antenna. net list, February 12, 2000 I've had my homebrew K9AY loop up now for 2 weeks, and decided it was time to pry myself away from the radio to share my results and impressions thus far. A 9:1 Balun For Your End Fed Antenna End-Fed antennas do have their place in radio and other communications work. I’ve been evaluating options for a low noise receive antenna for 160 meters. Doesn't take much space to install and works well. 8:1, followed by the 40 m wires then the 80 m wires. For condo windows, hotel balconies, and other space-limited locations, we use the loop in the horizontal position, which (of course) gives vertical polarization and an omni directional radiating pattern. But, in my opinion, that's a small price to pay for the advantage of being able to put up a relatively balanced antenna in less space that an inverted "V" would require. This publication is a compilation of visual Quality Accepta. It is a homebrew skyloop HF ham radio 2. The impedance bandwidth of this antenna at less than -10 dB is 220 MHz (2. BUILDING A 40 METER SQUARE LOOP ANTENNA BY Bill Prats K6ACJ Palm Springs Desert RATS Amateur Radio Club Building this antenna at a desert camp out and picnic was a Desert RATS Club project organized by myself and Peter VE7REZ/W6 club president and erected by five club members somewhere south west of the Salton Sea in BLM Land. 5/5click here to see their performance reports. Probably could be done but the bandwidth would be pretty small with constant retuning. The tuner has been operated at power levels up to 5 watts, and it would probably be adequate for several times as much. CONCLUSION: If you are interested in working low band DX and back yard space is scarce, this is antenna well worth consideration. Easy to Install and Use KM5M on 23rd Apr 2014 The NI4L end-fed 40-6m dipole antenna is just about perfect for portable operation. The antenna was never very well tuned on any specific band, but it managed pretty well on 30 and 40 meters with either built-in or external tuners in the shack. If you have a small patch of land to provide an earth ground, and if you can get one end of a wire secured at about 25-30 feet off the ground, you can construct your own custom solution. Here is a nice Pro-version 160 Meter "half-sloper" for 160 Meters. The antenna This 10 - 160 meter tuned horizontal loop antenna is fed with 450 ohm ladder line all the way into the ham shack to an Palstar AT1500BAL balanced line antenna tuner. I cut some antenna wire into four lengths at about 30 feet each and have them ran out for the radials. 10 Meter Smartphone Endoscope lets you view the tightest to reach locations on your smartphone or tablet PC. This is a SINGLE BAND ANTENNA, intended to make possible amateur radio transmissions for those that can not install any other type of antenna system. I had to recalculate the number of coil turns from the design diameter of 18. MCR COMMUNICATIONS LWHF-40-DX Long wire Antenna. All you need are three mounting points, a balun, and some wire. 1/2 WL 40 meter loop antenna view. A Rohn 25 tower held the main base station antennas. It also holds the two ends of the antenna loop apart. Two 1/4 wave ham sticks in a dipole configuration produce a 1/2 wave dipole antenna. Build your own K9AY George Maroti [email protected] Download with Google Download with Facebook or download with email. that the tuning for 80 meters would be a little touchier than the higher bands. However this performance requires that conductor power losses are zero in addition to any associated dielectric losses. One way to do this is to use the linear loaded koncept. I used up two quarter mile rolls of electric fence wire. performs well, but is "a cloud burner," good for local contacts within 500 miles. I Cheap products from ® ALFA Network Shop Online 90. When space is limited one has to design and build shortened antenna. 160m/80m Broadband Antenna by K5GP A presentation to CTDXCC September 22, 2008 The 160m/80m broadband antenna design objectives were to have: 160 and 80 m antennas since I had no antennas for these bands, the antennas had to be hidden because of covenant restrictions, open wire feeders would be too visible to be allowed,. K5LAD's Assorted Ham Stuff "I can’t work 80 meters, I don’t have a good 80 meter antenna" How many hams have made a statement like the title of this piece? Quite a few, I’d be willing to bet. A magnetic loop is an extremely high-Q antenna with a very tight bandwidth (think ~5kHz on the 160m band), but they are tunable. Add you loop wire of choice and your coax cable for rig connection, and enjoy DXIt consists of: Custom designed Air core transformer using 12g stranded wire. Low profile operating -- SMALL LOOP ANTENNAS. However, 20 meters was not going to go away, and there would be some openings on 15 meters even at a sunspot low. 40 meter Delta Loop Joe on 21st Oct 2016 I recently purchase a 40 meter Delta Loop from Chris and received the antenna few days later after the purchase, I hung up the antenna in less than one hour in configuration, C , I hook up my antenna analyzer after the installation and I was Very surprise is flat 1:1 on the entire 40 meter band, 20 meter was about 1:2 on the top edge of the band and the. Users of this antenna, including the military, have reported very good results even when mounted close to the ground. My backyard is quite small and I don't have much space to hang up large HF antennas. They take up very little space for the 40, thru 10 m bands. 00 three-resonator adapter plate. For a general purpose multi-banded small yard wire antenna the Inverted L is a good choice. These fed into a small matching box that I built using a schematic I found online. Caged Fan Dipole Project. In my last post, I described a 40 meter vertical with tuned counterpoise that has performed well on the 7 MHz and 21 MHz amateur radio bands (the 15 meter antenna uses the third harmonic of 40 meters and works as a 3/2 wavelength antenna on 15 meters). The ARRL Antenna book has a section on Shortened dipoles with a chart for determining the approximate inductance values for off center loaded dipoles. After having a great deal of success with a 20m moxon at my QTH, I decided to build a portable version, based on help from The Moxon Antenna Project by KD6WD. The best part of this antenna is that when transmitting, the antenna loads well at EVERY harmonic- the 3. It covers the entire 40 meter band with a SWR of less than 1. Filled with practical advice, this book guides you to finding the right antenna design to fit whatever. ½ Wave, 6-Band HF Cobweb Antenna 300 watt Restricted space spoiling your operating fun? MFJ-1836 puts your call back on the map! This fsix-band (20, 17, 15, 12, 10, 6 Meters) half-wave open-loop is perfect for restricted space or portable operation. Avoid switching wire antennas to work different bands. On the other hand, even a 40 ft antenna for 160 meters is small in. Random Length Radiator Wire Antenna 6 6. Overall length is 40 ft. 2 picture of the antenna farm of RM9A with 3-layer stacks on 20 through 10 meter bands and a 2-layer one on 40 meters all using bidirectional fixed antennas. 2 dBd forward gain with all backlobes more than 20 dB down across the FM broadcast band. crank up tower and considered various antennas to put on top. these 3 to 3 1/2+ foot antennas perform close to and in some cases (low mounting heights for one) better than even a small beam. It's construction consists of about 40 feet of wire wrapped around the 4 foot form with around 63 feet total of wire used in the complete 160 meter addition to the antenna. Louis Vertical-- By Dave Gauding, NF0R. It is only sixteen feet in length, which makes it much more reasonable for temporary installations. This material is good because it is an insulator and is also made to be UV light resistant. STACKING ANTENNAS. My K9AY RX Antenna. The tuning process is the same as for the 40/80 dipole, excpet the 20 m wires are trimmed first to an SWR of 1. The half-wave length dipole fed with 450-ohm feedline (the classic "doublet") is a basic antenna that will give you hours of enjoyment and plenty of DX if the flat top is at least 30 to 50 feet (9. The coax feed is inserted into the DE T via a drilled hole on the T’s under. Question, hopefully OP would not mind. Wanted plans for DC 40 meter CW receiver. Sky-gray fiberglass spreaders and nearly invisible wire elements (12’ di. The 20 and 15 meter dipoles worked fine with VSWR under 2:1 across the band. The Super Bazooka is with its length of 3,4 meter suitable for 160 meter. However when working long-haul DX, it was consistently 1 to 2 S-Units better than my 40m dipole installed at 40 ft. Overall, I consider my first use of the 40 meter Isotron a success and can't wait for the winds to taper off, which will give me the ability to get the antenna up a little higher! In conclusion, I must say I am very satisfied with the Isotron 40 meter antenna. ProComm PCF40 - 40-Meter HF Fiberglass Ham Stick Antenna. On 80 meters with the modified Scorpion cap hat installed, ≈55 turns show above the contact ring. 5, and Hi-Q-3 antennas. Over the last 28 years I have tried many different 160 meter antennas. HF Antenna #3 – Folded Skeleton Sleeve Dipole. The reason is that a magnetic field is much more concentrated than an electrical one, for example a small horizontal loop at 17 feet performs better (lower radiation. The Isotron Antenna. Working 160M From a Small Lot (and Larger Ones Too) antenna in the center of open space with a 100 ft radius. It offers a small, effective 30-inch-diameter indoor spiral loop that takes up very little domestic space. My antenna has been up for a couple of years and I work European DX on both 40 and 80 with no trouble I have it set up as an inverted V with the center about 35′ above ground on my tower. It also does a great job on 20 and 17 meters, using the antenna tuner. Keywords: smart energy meter, loop antenna 1. Right now I have a double bazooka 40 meter dipole up along the back block fence in an inverted v configuration. There was a benefit to the losses of the tree and mast. Like a hard-driving athlete whose joints need help, the giant "Mars antenna" at NASA's Deep Space Network site in Goldstone, Calif. I needed a lightweight, small turning radius antenna, with good performance on the five bands from 20 through 10 meters, that could be easily adjusted for best performance after assembly. One way to do this is to use the linear loaded koncept. I was a little concerned that removing one antenna and putting up another so close to the existing 40-10 meter dipole may have affected its tuning so I also checked its SWR. WA2TAK's Compact 40-Meter Rotary Dipole This is WA2TAK's solution to the problem of installing a 40-meter rotary dipole on a small city lot. It was called the MA8040V. Wired Ethernet-based internet access goes a long way toward solving these issues. 15 meters is a "bonus band" that will require a tuner. Many hams encounter problems in erecting just one antenna, so the thought of needing antennas for five bands seems out of the question. That antenna basically was useless compared to the 40-10 meter DX-EE so I removed it and figured I could use the existing eye-bolts for this antenna. JK Antennas can meet your needs with a wide range of Ham Radio, Amateur Radio HF Antennas, including Monoband, Dualband, Tribander, Multiband, operating on frequencies from 6M to 80M. ~ 0 dBi @ 25° for 40 meters ~ -2 dBi @ 29° for 80 meters - this is quite functional ~ -8 dBi @ 23° for 160 meters - lossy, but it does work; Several things are apparent: The antenna has "better than nothing at all" performance on 160 meters and is certainly interesting for this difficult band. " It rises as the length of the antenna increases beyond ½ wavelength. I have a small city lot with some HOA restrictions. A second advantage is the antenna's simplicity for a 4:1 frequency range with the bi-directional characteristic. I chose 58' for Mid 80 Meter Operation. Re: HF multiband antenna for very small garden Hi Steve, I think you shouldn't rule out a multi-band (mobile) vertical as these antennas have improved immensely and since you're thinking of operating 160, 80 & 40 meters , there are many manufactures to chose from. 10-80 Meter 100W Alpha Loop 100W 10-40M, 20W 40-80. EWE Antenna 9 12. Why aren't full-size HF loop antennas more popular « Reply #9 on: March 06, 2002, 05:43:36 PM » The best performing H. Introduction Of the many different antenna projects I have built for HF, the most interesting and rewarding project was the small transmitting loop. 5 metre loops work suprisingly well on 7 MHz). For this reason the 40 meter section was left a little long so that when the 80 meter section is the correct length, the 40 meter section resonates on the desired frequency. This break-through antenna was designed by Dr. All i need now is the right antenna for the relatively small space i have? Can you help please? I've bought a 67ft Western HF10 which i'm struggling to work out the room for.