Depending on how it’s constructed, it can withstand higher SWR with lower losses than coax. HF Vertical. A Full Size dipole for 7. 150 MHz) is territory for the cw and digital enthusiast. The KL3JM 80 40 20 "SRI" Fan Dipole Build a 3 band reduced space multibander THE DIPOLE ANTENNA What is a dipole antenna? KL7JR END FED ANTENNA Using CB Antennas on 10 Meters! By N4UJW W6HDG FAN DIPOLE ON A FENCE! A quick and easy hf multibander! THE MAYPOLE ANTENNA. It was built to take along camping so I would only have to take & put up one antenna instead of two. Calculating the Length of the Dipole. 5 – 54MHz 5kW #4115ocf from Balun Designs. 40 meter Yagi antennas, are complex to build due to the overall antenna dimension, and the world wide web unfortunately does not offer many projects, but we discovered some realizations that could inspire you to us, especially on 40, 80 and 160 meters. This unique design eliminates the need for antenna matching baluns and can be fed directly with 50 Ohm coax. Dec 28, 2016 · First, it is important to understand the difference between the end fed half wave and a random wire (or “long wire”) antenna: the random wire is just a piece of wire that is matched to 50 Ohm impedance using an antenna coupler, sometimes adding a 9:1 unun. The RG58 was at a 90 degree angle. This antenna would require eight traps. Jun 20, 2019 · End Fed Half Wave 40-10 Wire Antenna. Below is one example of how to build and mount a 40 meter loaded dipole using basic materials. This antenna is made for the Ham operator that ís looking for a compact dipole antenna to work on 40M. 2:1 on 15, 20 and 40 meters. Adding inductors to your dipole makes it possible to reduce the overall length of the antenna. Fundamental-frequency operation is provided on 80 and 40 meters, and long-wire, odd-harmonic operation on 17 and 10 meters. So lets get started. All-Band OCFD. G5RV Antenna by W8AOK The Walnut Tower antenna project. This is the minimum length for maximum efficiency. Crimp and solder. How to make a 20 Meter Dipole. 699 M). Wire length and support. 10M Antenna. short dipole for 80m. The DEZepp is essentially two end-fed collinear dipoles. 21 meters above the ground. I've built and used one myself. Feb 17, 2011 · There are two ways to mount the antenna. Homemade Ant . € 33,50 – € 37,00 Incl. (by W1TR) In the case of my 40/15 fan dipole, you need 30 degree angle separation to get good performance. The 1:1 choke "balun" is not actually a balun. 500mhz. 4 MHz. It is a half wave dipole designed for the center frequency of 28. I’ve tried a few along the way. Good for running a second radio and it gets me on 10m InnovAntennas DXC-140 40 Meter Rotatable Dipole DXC-140. Homebrew G5RV A G5RV plan for 10-160 meters, 10-40 and 10-80 meters band. 64 meters) long. [1] While the antenna performed well, a monsoon storm last summer beat it up enough that the antenna wire broke at the center balun. 100 MHz to 10. ) It must be made of durable, high quality, weather worthy components. Add to cart. A 30 Meter Sloping Dipole Antenna. The DOUBLE BAZOOKA is 98% efficient and Mar 31, 2016 · From The RadioReference Wiki. Doublet aerials for HF amateur ham radio and broadcast bands. Post #1435. Government as a radar antenna. Using larger of the ring terminals, pass wire through and loop over ring. 160M End-Fed. Attic SWL Antenna. Then there’s six meters, the Magic Band, where the antennas are small enough to fit in your backyard or even your attic. in the early 1940’s for use by the U. The resource is currently on dxzone. In this video I use materials on hand to build a 40-meter amateur radio dipole. An improved 40-80 double extended zepp Article originally published in ARRL compendium by N6LF revisits the classic double extended Zepp to improve pattern and SWR bandwidth. 10 meters per side. Many hams do quite well with dipole antennas that are electrically low; for instance, an 80-meter dipole strung between two trees at 50 feet (less than a quarter The BAZOOKA antenna design was developed by the staff of M. Let's Build One! The NVIS antenna described is based on the proven information from the military AS-2259/GR antenna. Get on 10 Meters fast with this basic 10 Meter Dipole project! This 10 meter dipole project will enable you to start using your new HF privileges as a Technician class operator on 10 meter SSB between 28. 40m. Sep 5, 2014 · I actually use his 80-40-20 fan dipole (3B2080LFAN), which is a clever setup. Build Instructions. My finalized portable End Fed Half Wave Antenna using QRPGuys "No Tune EFHW transformer" and 59 ft of Sotebeams light antenna wire cut for 40 meters. I wanted to get on the air quickly. If you don’t have Google+… Short Antennas "Loaded" Dipole. Feeds with 50 Ohm coax. At the least, a dipole should clear any sur- rounding buildings, and other large obsta- cles, for good performance. So I know it is possible to make some DX contacts with them. The problem was that the fishing pole was only about 7 meters long. Post #1436. Also shunt coil may be required. Most of the mechanical construction is now ready. 8′ 1″ OD fiberglass tubing, boom (MGS) 4. The balanced feeder provides some advantages. I replaced the nest was replaced by a half-size G5RV in a “lazy” inverted V configuration, tucked up in the rafters. In the week when we celebrates Hidetsugu Yagi’s 130th Birthday we selected 5 homemade Yagi-Uda Antenna Project for the 7 MHz. Sometimes, all you can use for 40 m field work is a low-slung portable dipole antenna. The OB1-40 is better than a normaly rotary dipole. 6 minutes. Here’s the rundown. The loaded dipole opens up the options for many armature radio users faced with space constraints. Sure, it is not the optimal setup. 5 inches and double over. Mar 17, 2018 · New 160 Meter Antenna. The 30 Meter Amateur Radio band (10. The steps outlined in this video can be used. Like I said in my original post, people are using these dipole antennas hanging in garages, apartments and the such. Resonates at 50. For further information on the 40 and 15 meter multiband antenna, please see my other article, The 40 and 15 Meter Dipole - a Myth Exposed. Post #1441. SWL Active Loop. Oct 14, 2018 · I enjoyed putting these pieces together from MFJ Hy Gain, MFJ Cushcraft, Texas Towers, M2 and our local hardware store to make an antenna which should last The antenna above has been described by Nadisha, 4S7NR and may be of interest to anyone wishing to get on 80M (3. NVIS dipole. Chris recalls a team event last year where they needed to get on 40m fast so a fishing pole and about 10 meters of wire were produced along with 2 elevated radials. = 7 meters each leg + length of the coil. He suggested experimenting with a helically wound vertical. It's assembled onto a homebrew wire winder. 41076. You should use 1: 1 Balun. Gain (dbi) 13,1 / 12,0/ 11,5. In this video from Chuck (KK6USY), we see how a few locally available materials can be used to design, build, and test a basic 20 meter antenna. A better design is to make a 2 m dipole with one (or two) closely spaced (about 1 inch) 70 cm 1/2 wave parasitic element (also called coupled resonator). On the leg with the aluminum braid, Noalox was used to prevent corrosion. 7 Mhz. This antenna tuned to better than 1. 7 meters. Because of the low losses at high SWR, you can use the doublet as a multi-band antenna. The BAZOOKA antenna design was developed by the staff of M. Your next antenna should be a Optibeam antenna :) 73, Uwe This antenna proves no exception to that rule. L2 also is 12 feet and the overall length is 48 feet. The Sloper. I'm often asked how to make a dipole. HF Antenna Setup. Is this one of the best antennas for the IC705 or FT718 ? One of the simplest, inexpensive HF antennas you can make is the "classic" dipole. The G5RV is an easy-to-build 80-10 dipole requiring no traps. 160M Windom. Main category is 20 meter Dipole Antennas that is about Dipole antennas for 20 meter band. Step 1: All of my 1" OD tubing is 11 FT in length. Part Number: IVA-DXC-140. This is a simple dipole built for two-band operation that I made for portable use with my 20 and 40 meter QRP rigs. 70 meters and yes, too short. It is made with very high quality materials and the. (6m. 400mhz but should cover most of this 200khz spread with Constructing The Vertical: The total height of this antenna is 33 FT. The second is to get the center of the antenna up as high as you can and pull the ends out as far as you can get them. The feedpoint uses an 8 inch long section of 2 inch diameter PVC pipe. Carolina Windom. It is a full sized 40m dipole, and the 80m loaded dipole is cut so that the center part is a 20m dipole. This antenna is a rewarding and inexpensive project for those of you who like to homebrew your own equipment. I hung it on the antenna test rig I bui Mar 10, 2020 · Advantages of the Doublet. This antenna covers 65 kHz of 160 meters, 75 kHz of 80 meters and the entire 40-meter band with SWRs under 2:1. The two loading coils are described as 67. Dipole Antenna Kits. Posted in HF Antennas. Homebrew EH Antenna for Jun 16, 2019 · Dimensions Of The Finished Antenna. g. Antenna, DXC-140, Rotating Dipole, 40m, 19. You could do without a antenna analyzer if you build your six meter folded dipole antenna system with the following dimensions: ==> Six meter folded dipole made of 450 ohm ladder line, #16 7 strand copper clad steel wire : 8. 09 meters above ground using a few trees in his back yard. best in its class in the market in terms of mechanical construction 40 meter amateur bands using a good tuner without modifications for the Ohio State Parks On The Air contest. Build a multiband HF antenna using multiple dipoles and single coax feed. The fishing poles should be as long as possible. I. He uses a 4:1 balun along with a length of 450 ohm ladder line to feed the antenna. The loading coils isolate the extra wire. As a portable antenna, it’s hard to beat, especially as an inverted vee. Here I show you what you need to make one and how I installed mine at home in The DIS-71 Discoverer rotatable dipole of low weight and wind surface area easily fits most existing beam installations. This is probably due to the antenna being fed away from the house. 1 MHz would require 67' 10-15/16" (20. Coil to end of dipole leg: 3. Good news! It can be designed for use from 160 thru 10 meters very easily using the standard 1/2 wave dipole formula: 468/freqmhz = total length (ft) end to end. I designed the antenna with a little cut and try using my new Trap and Stub Dipole Antennas for Radio Amateurs Sep 17, 2017 · Here's another HF loop antenna idea if you have some trees or tall supports in your backyard. So far it received 1 votes for a total score of 10. The antenna consists of a regular 40 meter dipole using a 1:1 balun at the feedpoint. The YT clowns have probably never heard of antenna modeling. The SWR is less than 1. I needed a dipole antenna for portable use in my The 6 meter dipole can be designed for any portion of the 6 meter band you desire using the formula. L1 is 12 feet. It is easier to trim the antenna while tuning than adding wire. 01 times 468 divided by the frequency in MHz) Compared to the construction effort of a standard multi-band dipole the only difference is the fabrication of a feed block or center insulator that is about 12 inches vertically by 3 I just put up an OCF dipole using an excellent 4:1 balun the OCF Dipoles 1. Towers The actual spec from the dipole centre was as follows: Dipole centre to coil: 3. The first is to get each end up as high in the air as you can so that the antenna is a straight line (it’ll droop a bit in the middle). I have horrific RF feedback in the shack on 40 meters. 66 feet (2. A common multiband trap dipole might be one for 80, 40, 20, 15, and 10 Meters. This is the price paid for multiband coverage and physical short- ening. See physical description below. 859 M). ( 1 ) Estimated Ship Date: Aug 26, 2024 (if ordered today) Free Shipping. 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. Turning Radius, Stainless Steel Hardware, Each. The DOUBLE BAZOOKA is 98% efficient and Mar 19, 2023 · Those work ok on 2 m but on 70 cm the radiation pattern is terrible. , a dipole or driven element) to an unbalanced line such as coax which is not balanced, thus the name, Balun. After installing a 2M/70cm vertical and joining the local MARA ham club (3), I put up a (4)homebrew 80/40/20M fan dipole on the side of the house . PART 1. Jul 10, 2011 · Beetle, I would love to have the antenna at 20 feet or better, but I am renting this place so 7-8 feet is about as good as it will get. This link has been on our site since Saturday Oct 31 2020, and it has been clicked on 694 times. The antenna is shortened by almost 12 feet on each side. Dec 3, 2021 · Here are some comments from "Red Summit RF": I take you through my steps to build this 20 meter-30 meter-40 meter linked dipole antenna, including construction of the insulators, and a trip into the back yard to tune it up. com in just one category. PART II. Easy SWR Adjustment Calculator for Vertical and Di Indoor Attic Dipole Antenna for Ham Radio & CQ Ant Ham Radio-Old TV rabbit ears as a junk box 2 meter 2 Meter Full Wave Loop-The Magic Wand Antenna. Gain. Building A Homebrewed Off-Center Fed Dipole Scanner Antenna. Feed it with 50 ohm coaxial cable as usual. Antenna Wire. Does anyone have any ideas? A balun's purpose is to allow connecting a balanced, (e. In between, you'll find RTTY, PSK 31, FAX, and other digital modes. I want to optimize based on a few things: small lot, low-vertical leeway, nosie neighbors and avoiding the power lines in the backyard, I thought that an EFHW 10-40 wire antenna is the best solution. 300mhz and 28. HOA HF Vertical. T. The scale is 1 - 10, with 1 being poor 20/40 Dual Band Dipole. For portable it seems to me it is easier to set up and use than a dipole inverted vee with similar performance. October 22, 2013. S. Antennas are always fascinating, with lots and lots of options from homebrew to buy it off the shelf. The exact length is not critical! If you don't have room for the 160 or 80 meter versionthen design it for 40 meters and up! Apr 8, 2018 · The 20 thru 10 meter dipole is constructed from stranded insulated wire available in most hardware stores. 10 Meter band dipole antenna kit, including 150 Watt 1:1 BalUn. I have put up many dipoles, windoms, and skyloops over the years in different locations all home brew. The solution to improving my send and receive would be making an End Fed Half Wave (EFHW) 10-40 antenna. Construct a multi-band off-center-fed (OCF) dipole covering the 40, 20, 15, and 10 meters amateur radio bands, and possibly the 6 meter band (but that is considered a bonus band, outside the main project objective. Easy to install with the manual. It was modified for amateur radio use in the 1950’s. Antenna Calculator. 70 meters this is what I used. GT 4-100 1″ Guy Ties, for tips of boom (RFJ) Extenders are required for 12 , 15, and 20 meters. A dipole fed with 300 ohm feeder can be used on all short wave bands. . Also, this antenna is quite, very quiet. 7 ft. As with other projects, this project is my gift to Radio Amateur! It may be published everywhere, but may not be reproduced commercially. Comes with pre-formed mast clamp. 2. A section of wire joins the elements at either side of the feedpoint to avoid the inductance of square knots used on lower frequencies. Starting with the bottom section of the antenna, a piece of 11 foot aluminum tubing was cut down to 6'. Feb 20, 2022 · This video shows my attempt at building a 40 meter dipole antenna out of stuff. While the antenna is almost full size on 10 and 15 Meters, the other bands are shortened considerably. 5MHz) that have limited space available. That dropped the noise by about 6dB. Jan 30, 2016 · 21319. Cutting Chart for 20-80 Meter Plug and Play NVIS Antenna Cut to be resonant at center height 16 feet with ends at 6 feet 20 meters 16’ 1 ½ inches 20-meter digital 16’ 4 ¼ ‘. This antenna has a 9 to 1 un/un and requires 30 ft of coax feedline. All bands are covered, including 30, 17, and 12. Marcus Schrader built this full-wavelength 40 meter loop (143 feet/43. center using u-bolts fastened over the pipe thru the center insulator or you could use metal pipe and adjust the length Jun 25, 2022 · Such a simple antenna to make and yet it performs so well. The 40 Metre Dipole. You can find cw operators around 10. 105 MHz and many Japanese hams clustering around 10. As the fishing poles I had lying around were 8. Jumper 2 ¼ ‘ 40-meter phone 32’ 3 ½” 40-meter digital 32’ 9 ½” Jumper 6” 60 meters 43’ 2” 80-meter phone 58’ 3” 20/40 Dual Band Dipole. Design Software. May 5, 2023 · A “doublet” is a generic term for a dipole that is fed with low loss cable (typically parallel-conductor twinlead or open wire line with impedances of 300 – 600 ohms) and matched on multiple bands using an antenna tuner at the junction between the parallel-conductor line and the coax. 130 MHz. The end fed half wave, on the other hand, is exactly a half wavelength long on the Jan 4, 2020 · A scrap piece of LMR-400 is being used at the feed point of the antenna. With the I'm using two antennas, the OB1-40 on top and OB11-5 beneath it, both at aprox. When we’re building a dipole, there’s a formula you’re going to use to calculate the distance, and that formula is 468 divided by the frequency you want to operate on. May 31, 2021 · For the past five years, I have been operating the lower bands (30, 40 and 80 meters) with a trap dipole that was modeled after a web article written by John DeGood NU3E. Jun 12, 2019 · Here's a remarkably simple, inexpensive, and totally portable 20 meter antenna you can build for under $20. But this time was a fiasco. The team simply wound the 10 meters of wire on to the Oct 22, 2013 · Post #236. 00/10. I use a Balun Designs QRP balun on mine. This episode is all about how to build that dipole antenna. Half-wave dipoles used on anything other than their fundamental frequency of operation, or any odd multiple of this, will work, but you will need to use an ATU. The G5RV has high SWR, by design, on most bands and a tuner is required. It's function is to help eliminate rf currents from flowing on the outside of coaxial cable using the principle of choke action. Po Multi-band hf loop antenna. for any amateur radio band from 160 through 10 meters. Antennas VHF-UHF Rover. This is the standard configuration. The JK401 is a simple Hi-Q coil loaded rotatable dipole, with a small footprint as well giving great performance on 40M. GT 4-050 1/2″ Guy Ties, for tips of spreaders (RFJ) 5. Share this product. I've built quite a number of these antennas and have strictly use them in the field for SOTA for many years. The "Slick Six" 6 meter dipole can be supported from good solid PVC pipe at the. home within sight of (2)salt water and on relatively flat ground , a good omen for future antennas. 3 meters. This antenna can be tuned to either 30 or 40 meters with a front to side ratio of 30 dB for a fast, expansion of band capability. The length of the fishing rods is 8. One combination that fits nicely is 3/4" copper pipe with 3/4" CPVC fittings (not to be confused with 3/4" PVC The highest frequency antenna is at the bottom and cut for 1% longer than the 1/2 wavelength (length in feet= 1. The 80 metre performance was great, far better than trying to tune up a 40 dipole to work on 80. When the dipole is installed horizontally, at about one meter (3-4 feet) above ground, you effectively get a NVIS low-noise dipole. DIS-71 Specifications. This design was chosen because of the simplicity, ease of construction and operation. Nov 13, 2012 · I chose the EARC end fed 6-40. Post #236. Measure antenna wire 4. A 40 meter dipole is around 10. 59 meters) and suspended it 20 feet/6. Aluminum/copper tubing construction: You will need to check the fit of the tubing with the T connector and the caps while you are at the store. Jun 8, 2020 · 8-June-2020. 83uH and can consist of 104 turns of insulated wire, wound Jul 10, 2014 · This ham radio coil-loaded 40 and 80 meter inverted V dipole HF wire antenna is easy to build! Loading coils make this antenna a full size on 40 meters and a… Video Rating: 4 / 5. To determine how much 1/4″ fiberglass to buy, you need to calculate the approximate length required for the dipole. Clear. HF Military. That is 70 feet long. The Sep 21, 2021 · September 21, 2021. Shorter antennas will also work, but at reduced efficiency. Special Order. The balun / For example a half-wave dipole cut for operation on 40 metres (7MHz) will also operate as a three half-wavelength dipole on 15 metres (21MHz), although the SWR will be slightly higher. Some very specific things, like SO239 Bulkhead connectors, FT82-43 Ferrite co A Portable NVIS Antenna is QRP-Friendly. Homebrew Tuner. 2:1 all the way across the 15 meter band, with independent adjustment for 40 meters. 1. With the use of an ATU (antenna matching unit) a 1:1 match was easily achieved. Measure out 8 inches of magnet wire and fold over. The legs are connected to the LMR-400 using terminals. SWL Antenna. VAT. As with all trap dipoles, this one has less-than-ideal bandwidth due to the load- ing effect of the traps. Small Mag Loop. The support of the Optibeam company is excellent. Homebrew 20/40m Travel Antenna This is a low cost homebrew two band travel antenna for 20 and 40 meters. Attach the loose end wire to the smaller ring terminal. Each leg of the dipole is cut longer than needed. The basic form of a doublet antenna. For maximum efficency, the Shortened Dipole should be no shorter than 45' 5-5/8" (13. Without enough protection from common mode RF feedback, my 160 meter antenna's coaxial feedline would likely pick up some of the RF radiated when I transmit on any Feb 1, 2020 · Welcome to another episode of Ham Radio Basics. This is different from the original version. Overall, the antenna works pretty good. Crimp. Jerry Davis shows us how to design, build, trim, and use a basic dipole antenna for the 20 meter amateur radio band. Here are some of the materials you need to start building your own homemade dipole antenna for ham radio. An off-center-fed 80 meter dipole that I use on all HF bands - from 80 to ten, sometimes even on the 6-meter band! A 40-meter dipole that I also sometimes use on the 15-meter band. Band. Categories: Antenna Kits, Dipole Antenna Kits SKU: N/A. fb gk ou es tb yh bj pl wd jn