I made one without doing this and it didn't work so well. It may not display this or other websites correctly. "Just received my new 64131 yesterday and was anxious to see how well it performed. Here are the final numbers (in my opinion) in green below that would be good for a long-wire antenna: (You may want to make a note of them), REVISED: 29 35.5 41 58 71 84 107 119 148 203 347 407 423, REVISION NOTE: We had a note from James, KB5YN, pointing out that one of my so-called GOOD numbers was 220 feet. The free end of the untwisted portion of the long wire (past the 14th winding) will be secured to this bolt as well on the inside of the box, while the radiator will be secured to it on the outside. W3EDP's results in the above referenced 22.00 + 5.00 Postage. It is used for non-resonant verticals like 43 foot or 33 foot Or Wire antennas like an End-Fed 1/2 Wave Multiple Length Wire Antenna. The "9:1 UNUN" are for random length wire antennas fed at the end. <>/Metadata 239 0 R/ViewerPreferences 240 0 R>>
recommended on VE3EED's page because I use all halfwave Following the directions exactly as specified (0.47wl / 0.05wl matching counterpoise) and drilling two weep holes in the appropriate position, I had a 10 meter EFHW antenna up in less than ten minutes. Again, the bands are USA, so change them endobj REVISED: 16 19 22 26 32 33 38 44 46 48 52 64 65 66 76 78 80 88 92 95 96 99 104 110 112 114 123 128 130 132 133 138 144 152 154 156 160 165 171 176 182 184 190 192 195 198 208 209 220 224 228 230 231 234 240 242 246 247 256 260 264 266 272 276 285 286 288 297 304 308 312 320 322 323 325 330 336 338 342 352 361 363 364 366 368 369 374 380 384 390 396 399 400 414 416 418 429 432 437 440 442 448 455 456 460 462 464 468 475 480 484 494 495 496. The key is you want to stay at least 1/2w long but not near 3/4w for any band of interest. As an example, a 28-31 foot wire will typically allow 40 thru 10 meter coverage and a 43-50 foot wire will provide access to 80 thru 10 meters. (Also note that here may be instances where the suggested lengths may not work exactly due to the many variables in the surroundings of the antenna, wire length variances, your tuner, it's height above ground, it's construction, etc. Kj8~q7c? AndWhat Is It Used For In Antennas? >> /Title (Wire-Lengths-for-9-1-ununs.pdf) Drill another hole in the same side as the antenna radiator wire mount hole. Each winding is counted when the wire enters through the center hole of the toroid. I got three FT240-43 toroids (two would be lighter, but three increases the curie point so it can handle longer duty cycles), a spool of the 14 gauge enameled wire . It is not a good choice for working lower bands from a too short wire, that is, if you have cut your wire to a 20m halfwave, it ain't much punkin' for 40m, 80m, or 160m. Upon further research, I remade it tightly twisting those two separate wires together, just as it shows in archjeb's picture, and it worked surprisingly well. I used 2000 and 1000 ohm resistors in series connected to the proper unun wires with alligator clips for a total of 3000 ohms. So you have the freq range of interest and the total length of the wire, figuring out wich balun will be a better match for 50ohm coax should be easy. >> The second smallest number I measured was 2.7pF, derived from the self resonance at 2.72 MHz with the magnetizing inductance (measured at 25.8 H) with the secondary open and the output wire folded to a small 1/2 length. <>
/Im0 Do often can't match it. Here is an ARRL The matching unit The impedance at the end of a half wave antenna is somewhere between 2000-5000 Ohms. it is easy to pack and easy to install. endobj What these lengths are depend on your tuner and also the wire's surroundings and also the ground system. Random wire lengths you should and should not use! Liquidtight NM 90-Degree Connector(Home Depot). wire lengths less than 1/4 wavelength of the lowest desired frequency Care to buy us a beer? 27.00 (27.00/Unit) Free Postage. In theory, my LDG Z100 Plus autotuner should be capable of matching the impedance of this 49:1 transformer with a end-fed half wave length antenna radiator across all amateur HF bands. 80m up, W3EDP's 84' antenna, 17' counterpoise is probably the way to go. 9:1 Unun EF Random Long wire matching Transformer with BNC or SO-239. I attached the toroids to a PVC DWV test cap with 3 cable ties. 35-45, 54-64, 67-77. When used with the stated lengths shown in thetable below, the 9:1 ratio will Based on the success of our model 4932, this 5kWconfigurationisalso perfect for matching both long and short length wire antennas for multiband use. 35-43, 49-63, 70-85. However, the radio didn't tune up very well on 15 meters. Lengths of a half-wave or multiple must be avoided. We hoisted the free end of the antenna wire approximately 30 feet into a tree. I say run what you got and don't worry about it. So those are the numbers above thatwe have to stay as far away from as possible when building a long-wire antenna. So is an essential piece of gear to have. I have found this calculation to work well, however it depends on many factors such as wire used, location etc. multiples, and of course different band combinations yield different https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. As an example, a 28-31 foot wire will typically allow 40 thru 10 meter coverage and a 43-50 foot wire will provide access to 80 thru 10 meters. /Type /XObject Each vertical blue line represents an amateur radio band. The idea A success! A couple hours later when I sat down to do some more DXing, I made contact with a gentleman in Slovenia-my second European contact. Best SWR was . endobj shown in the column e. var sc_project=8077274; are blocked out because an antenna should be at least that long. these are the worst lengths and you want to be as far from colored google_ad_width = 160; Winding 1:64 Matching Auto Transformer on the FT240-43 core. all US ham bands. Odds are that most lengths are fine though, so the easiest solution is to pick a length based on something else (like, the room you have available) and if you get unlucky, roll the dice again. 2 eyehooks with washers and nuts (I used #8 diameter, but size is up to you.) Figure 3 Wiring of the 9:1 voltage unun. I have included a screenshot showing the stations that reported spotting my 200 mw beacon over the last 16 hours. Y &lD30. Typically unbalanced = 50/75 ohms too unbalanced = 450/675 ohms. SBULLET-9U-1500. 3 to31 MHz - up to 1kW intermittent (50% duty cycle). In fact, the 9:1 unun that I built is actually an autotransformer. Wire lengths for the 4:1 ratio in models 4932 and 4935. Let's have a look at a few details on how to build a 49:1 impedance . After winding #2 is made and extends down the backside of the toroid, untwist the wires. Just a note, if you make one of these yourself, you need to twist together the first two wraps of the 14 winding wire with both wraps of the two winding wire. Clansman End Fed Long Wire Antenna Used. I'll get a 9:1 unun,and use a suggested random wire length to avoid half-wave and it's multiples then,that sounds like the best things I can get out of this setup. The novel thing was that I only built it the day before and it uses a Coghlan camping washing line spool with the string taken off and about 21m of wire wound onto it. (The numbers aboveare a great start, thanks to Jack and Mike! This homebrew 49:1 impedance transformer is the heart of any EFHW antenna you will build, most of the time. /Contents 5 0 R Update guys:made the unun,the antenna was extended to about 37m length,and I added a counterpoise which is about 10m.The whole thing is much higher in the air,compared to where it was before. Hertz Antenna" shows in line 2 of the table that a similarly installed CQ-Calling All Hams! You can get good loading and low swr on sometimes 2 or 3 bands, but one or more of the bands thatyou want, just will not cooperate with an swr that can be adjusted with the "tuner". UJM-49-1 $56.99 Save up to 6% when you buy more. I'm consistently pleased with the quality and ease of use of Balun Designs products and look forward to my next purchase in the future. Save program output in file named 'f', and use So after much frustration..down it comes and you go on to a totally different type of antenna.all that time just wasted inyour opinion..until now! This article details the construction of the transformer. I included the tools I used to analyze the transformer as well; this is only necessary if you are interested in analyzing your project. The Nelson antenna 9 to 1 unun did the trick. This is the latest and greatest transformer design for End Fed Half Wave (EFHW) antennas. <>
EFHW unun Resonant Long Wire 49:1 Transformer With BNC or SO-239 | Mobile Phones & Communication, Radio Communication Equipment, Antennas | eBay! That's it in a nutshell..or is it? Both were on 20 meters at 97 watts, Icom 7300. Using a 49:1 transformer shoot for the best 50 match @ appx 2450 load over your working frequency bands. Advertising Info The 49:1 unun with 3000 ohms of resistance shows a VSWR under 10:1 from 160M to 15M, and less than 3:1 from 80M to 20M. NEMA rated 4x marine grade junction box for outdoor installations. 0$Ve Box cutter (for scraping enamel off of wire ends), (Helpful) Step drill bit for SO-239 connector, Paracord (for simulating and measuring lengths of windings on toroid), Antenna analyzer for HF frequencies (I use the RigExpert Zoom AA-55), Resistor(s) totaling about 3000 ohms (I used 1K and 2K ohm resistors in series). random wire page. Let the now free end of the short wire hang down from the toroid. SO-239 connectors are silver plated with Teflon insulation. Cut the antenna radiator wire (free untwisted end of long wire) of the unun to the correct size, scrape the enamel insulation off of the free end with a box cutter, add a ring terminal, and secure to antenna radiator bolt with washers and lock washers. Longer wire is always more . Post Reviews Step 1: Drill holes for and install the SO-239 or BNC connector, the stainless steel machine screw antenna connector and the ss machine screw ground connector. Well, I didn't think it would make any difference at that many multiples. endobj
<< 9:1 or 49:1 unun for end-fed long/random wire? 49:1 UNUN IMPEDANCE XFORMER FOR END FED HALF WAVE ANTENNA. I have used the 49.2 ft (15 Meter) length of wire on vacation with both automatic tuners and an MFJ Model 16010 tuner with good results for 40, 20, 17, and 15 Meter operation. var sc_invisible=1; Be sure to review the various lengths in the link below to obtain the lowest SWR across most if not all HF bands. We do not encourage any radio operations contrary to regulations. One is for the top of the box so that it can be hung up. results. 748 0 0 752 0 0 cm You have to stay away from a half wavelength on any frequency. Use a slide rule! The most common question I get asked is what is the correct length for my End Fed Long Wire Antenna? The trick, therefore, is either The goal of the impedance transformer is match the 50 ohm impedance of the feedline (coaxial cable) with the potential 3000 to 4000 ohm impedance expected from an end-fed half wave antenna wire radiator. google_ad_slot = "1982258389"; A few more comments about this 49:1 autotransformer EFHW design. /Pages 3 0 R but instead of the Jaycar core, we used an Amidon FT-240-43; anyhow, we also followed the UnUn with a 1:1 guanella choke and boxed everything, at that point, we . Powered by BigCommerce. June 8, 2022 at 9:17 am. stream Note: My (A to B) length was 6 inches. 49:1 End Fed Half Wave Antenna 40-10M 100W Version Bands of operation 40,20,15 & 10m using 67 feet of our UV, Ozone resistant Antenna wire. 1. >> endobj
The WSPR map is so dense it looks like the US and Europe are just big blobs of color. endobj
So for example 80m could range in length from 120 to 133 feet. To summarise the results WRT to reference antenna consisting of 30ft wire vertical fed with auto- So, if you connect a length of wire that presents an impedance of about 450 to the input, you'll get an impedance of about 50 on the output. We recently found some good information about random wire lengths that you should and should not use. Some important and helpful references I used for this work: https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. Enclosure Height: 5.000 in. This article explains why the use of mix 43 for HF applications is almost always a mistake. 4 0 obj
It's an efficient way to get all the multiples It uses an FT140-43 or FT240-43 toroid in a 49:1 impedance matching unit at the base and a 110 micro Henry (H) coil to act as a loading coil for 80m and a choke to stop higher frequencies using the last 2m of wire. endobj HF Underground wiki Radio Hobbyist technical blogHFU Discord EuroPirate ChatPropagation DataTeamspeak Server, TDK CXA-2090 LCD Inverter Module New Old Stock USA Seller $19.99, Shortwave Pirate Radio In North America And Around The World, And Other Signals That Go Bump In The Night, Login with username, password and session length. and experiment. q the program as I did, above, for my K1. The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. For those that enjoy the LNR and Hy Endfed antennas, but want to run more power, We have also installed an additionalstud which can be used for a separate counterpoise wire rather than forcing the use of the feedline's coax shield, ttaching a counterpoise wire to the common point of the auto-transformer, provides the antenna radiator something to push against rather than the coax shield. Continue on winding the long wire through the toroid to complete loops 3 through 14 as shown in the schematic below. An UNUN is needed to match the high impedance of an end fed antenna (2k-4k ohms range). See the picture below. /Producer (XnView, http://www.xnview.com) Moving the pot up and down gives a feel for the SWR versus antenna impedance sensitivity. Designed for use with single wire unbalanced antennas, this new addition is small, compact and perfect for quick portable/emergency installations. Built with the same craftsmanship as all our other For those that enjoy endfed antennas but want to run more power, Balun Designs now offers an excellent alternative. These are sometimes known as a Magnetic Longwire Balun. When you're 1/2w long you're around 2k ohms or more where the balun won't under or over xform; as you approach 3/4w your z is going to drop to where a coax match can be made just by soldering the wire to the center conductor sans balun - more or less the principle of the windom and ocf dipole. I've made contact with several folks across North America in my 6 months as an amateur but getting to Europe flipped a switch and I'm afraid this amateur radio thing is going to be addicting. Just add or subtract as needed a little at a time toget the best compromise. Cannon". endobj Start winding the Matching Auto Transformer, each pass through the center of the core equals one turn. Caution: When used atfull power rating of 1kW, the antenna must have a low SWRon the band selected and be used on a 50% duty cycle. A standard recommendation (see QST, March 1936, p. 32, "An Unorthodox Suggested wire lengths for 1-61 MHz operation (measured from Bullet wire point): Bands Covered (meters) Wire Length (feet) Minimum Coax Length (feet) 40-30-20-15. var sc_security="1df091cc". Links /* Ad banner 160 x 600 */ <>
<< /&KWA7{L=D]g0Z!F9;V{zL[h-D,u(.9rg(RHI{f t*C/?? A 50 foot run of RG-8X coax connected the antenna into the LDG Z100-plus tuner and then a Yaesu FT-891A transceiver. document.getElementById("copyright_year").innerHTML = new Date().getFullYear(); Twist the short and long wires together starting at an end of each wire. The key to end fed antenna success is the matching network interface between the long wire antenna and the coax feed line and feed line choke at the transceiver. However, the list has been revised and is good for wires as long as 500 feet. Electronics JC[
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a@G`' zxUHXW&`}mEp`?i0 oE:N0-/t"t.-? I only used two screws instead of four. installed, it is a compromise antenna but great for portable use because Free Postage. Cut the center conductor wire (free untwisted end of short wire) of the unun to the correct size, scrape the enamel insulation off of the free end with a box cutter, and solder it to the SO239 connector. Usually any wire length that is non resonant, like those shown above, will work with the 4:1 ratio. uR5I5z G^u2`j[}+sy9 He used 300 ohm twin-lead and a 4:1 UNUN, with a 1:1 current choke between the UNUN and the coax to the tuner and transceiver: The full-size "flimsy" (ref. << x[q;`&z`uAlo#V@;hvOYt, @*Ys~_W_~W_aw_
p[N+}[t-^oLy}xz>7/~c|ZZt75;kN^=>Y+_~|b~"m*tw>xG=x6Qwz|xvz- Ham Satellites Coverutilizes integralneoprene gasket for weatherproof integrity. Dimensional Drawing of Standard Enclosure, 1:1 Common Mode Choke / Noise Suppression, Core Material Selecton for Baluns and Ununs, Antenna Matching Problems When Using Ladder Line or Open Wire Feedlines, Model 4932 - 4 & 9:1 Unun 1.5 - 54MHz - 2kW, Model 49130 - 49:1 - 80-10m EFHW - 200 watts, Model 64131e - 64:1 & 49:1 - 80-10m EFHW - Up to 1kW, Model 4116 - 4:1 Hybrid Balun 1.5 - 54MHz 3kW, Model 9130sw - QRP 9:1 Unun 1.5 - 54 MHz - 300 watts, Model 1115d - Max Choking 1:1 Balun, 1.5-54 MHz, 5kW. understand its properties. , This is a partial reprint (with permission) of an excellent series of articles published by KV5R thank you. Cut the ground wires (free twisted short and long wires) of the unun to the correct size, scrape the enamel insulation off of the free end with a box cutter, and add a ring terminal. Part List: I made just a touch over 100 QSOs today with the new unit. %
A way of connecting the analyzer to the transformer. 33 ft #18 insulated copper wire (20m half wave), Counterpoise: 1 meter coax (0.05 x wavelength) connected between 64131 and Balun Designs 1115d Isolation /Choking balun, If you would like to use high power up to legal limit with a single end fed wire antenna (not necessarily a half wave) consider using our. /Type /Pages An excellent way to attach a long wire antenna to the Ham It Up, this 1:9 balun has an SMA output port and high-quality spring-type terminal block input for your coax. Start winding the toroid with the twisted wires at loop #1 (see schematic below). Jack, VE3EED - SK. You will also need a half-wavelength length of wire (14 or 12 gauge typically) in order to construct an antenna radiator for whichever ham band you choose. Bullet 50:450 (9:1) HF Unun, 1.8-61 MHz, 1500 Watts, End Fed Antennas. About Batteries (A t0 B) Fold over 6 to 8 inches and twist it together. Antenna Safety! Superglue 2 toroids together. Balun Designs. /Name /Im0 Here I show finalizing the antenna, getting it in the air, and run. The beauty of the halfwave antenna is it's a complete antenna in the sense it needs no counterpoise. One single wire, no solder connections,very simple.all the way from the tuner to the end support. Superior Essex Heavy build polyamideimide. The First Thing New Hams Often Ask:What Is An UnUn? The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. 1863 1.49 swr 3915 2.50 7200 1.80 14.332 1.29 18.130 1.07 21.300 1.40 24.950 1.30 28.400 1.37 This is a great antenna that is . x@ The short piece is for the primary winding of the transformer, and the long piece is for the secondary winding of the transformer. endstream A good place to start is the formula 468 / f (MHz) for a 1/2 wavelength wire antenna. Humor are easily converted to half wavelengths by the famous 468/f generally Use only the white gaps for your antenna lengths, and if Multiples are on C and The most important length is one that is non-resonant on any band. wire to the UnUn "-" connector and then down to ground there it connects with the two other wires but neither the counterpoise nor the two other wires are connected to ground. You are using an out of date browser. About Hamuniverse . 0
Continue twisting the entire length of the short wire. Repeater Builders This will be for an eyehook in order to provide strain relief for the radiator wire. K1S Valentines Are (Almost) Out The Door! Because I had some spare Cu-Wire I wound another 1:49 Unun on a smaller FT-140-43 toroid and tried different capacitors between feedline and ground (to compensate for the 10m band). FCC Information >> Code Practice When do you use a 1:1, 9:1 or a 49:1 balun? this A png image named g.png will be created. Drill out holes in the designated bottom of the electrical junction box for the SO239 chassis mount. doing the initial 468/f on C and D scales. Usually any wire length that is non resonant on the band or bands desired will work with the 4:1 ratio. End Fed Half Wave Antenna Coupler Schematic - 7-30MHz. 59 0 obj
<>/Filter/FlateDecode/ID[<81C501BAF3AD19DF6B2122F37F15AF84>]/Index[25 50]/Info 24 0 R/Length 149/Prev 898971/Root 26 0 R/Size 75/Type/XRef/W[1 3 1]>>stream
(Originally published February 22, 2021). I did not want to put the transformer in the housing until I tested it. The vertical (y-) axis shows the VSWR and the horizontal (x-) axis shows the frequencies. As typically InJack's own words. You will note that when comparing my results with VE3EED that some of the results are a bit different. bands you're intested in in a vector like the example below, by typing. He was so impressed that he purchased a 9:1 unit from you, his will be delivered Saturday.