Q 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. Well then you need to choose a wire length that is at least 1/4 on 40 meters, and doesn't fall on any of the 1/2 multiples for ALL the bands between 40 to 10 meters While you could certainly calculate the lengths to avoid using the standard formulas, and then make a chart, the section below may be what you are looking for. Jack, VE3EED - SK. Wire lengths for the 4:1 ratio in models 4130, 4132, 4134, 4932 and 4935. License Study 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). For example, /Type /Pages 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. The vertical (y-) axis shows the VSWR and the horizontal (x-) axis shows the frequencies. <> The unun was floating at about 15 feet above ground. An UNUN is needed to match the high impedance of an end fed antenna (2k-4k ohms range). excellent page for EFHW info - or, addressed below, to cut the wire A png image named g.png will be created. random wire page. Performance is ASTOUNDING, far exceeding my expectations. If you want a single band portable antenna you can mount pretty much however, look up this design. /MediaBox [0 0 748 752] 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. While I have not done so yet, I plan on gluing the test cap to the back of the junction box. Downward impedance transformation by factor of 49. (wlSR9dJ_x%+VHX4FRr 3>;g^x%g'wkJu,i~#Q"2|WGf[!_m]#&1$)R.{--" 'dGO;=_B$T}". which got me thinking. When used with the stated Balun Designsis now offering a low power alternative for those who want to use an End Fed Half Wave for portable or temporary installations. This is to avoid the antenna radiator from acting like a resistor, and thus instead of radiating radiofrequency energy produced by the transmitter, sending it back down the coax toward the transmitter. We are working every day to make sure our community is the best Radio Hobbyist's site. endobj >> So for example 80m could range in length from 120 to 133 feet. >> Even better would be shortening to 53'. well, the main antenna wire goes to the 9:1 UnUn "+" connector, the vertical counterpoise (insulated !) endstream 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 . /BitsPerComponent 8 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). "I received my third balun from Balun Designs this afternoon. is helpful if you're in a hurry to get on the air, read up on the topic Prescott Hamfest 2023 Saturday - May 13, 2023 - 0800 to 1200 MST Granville Elementary School 5250 Stover Drive, Prescott Valley, AZ 86314 The 2023 Prescott Hamfest is co-sponsored by the Yavapai Amateur Radio Club (YARC) and the Amateur Radio Council of Arizona (ARCA). , Most matching problems occur when the antenna system Super Bullet Features: - Uses proprietary broadband impedance transformer design for maximum bandwidth with SWR < 2 from 1.8-61 MHz for 1500 Watt model and 1.8-30 MHz for 3000 watt model The other is to provide strain relief for the antenna wire). Links 2. The length should be calculated based on the lowest frequency to be worked. It is used fornon-resonant verticals like 43 foot or 33 foot Or Wire antennas like an End-Fed1/2 Wave Multiple Length Wire Antenna. Post Reviews You have to give up a band or two, like 60m and 6m, as In addition to multiples, K1S Valentines Are (Almost) Out The Door! The short piece is for the primary winding of the transformer, and the long piece is for the secondary winding of the transformer. Typically unbalanced = 50/75 ohms too unbalanced = 450/675 ohms. Here they are in order: Advertising Info Enclosure Height: 5.000 in. A Balun is used to match a balanced line to an unbalanced line. (Also note that here may be instances where the suggested lengths may not work exactly due tothe many variablesin the surroundings of the antenna, wire length variances,your tuner, it's height above ground, it's construction,etc. Antenna Safety! Thank you so much for such a great product! . Liquidtight NM 90-Degree Connector(Home Depot). You also want the antenna to be at least 1/4 wavelength long for each band you plan to use. Theme designed by Papathemes. The Short Answer Would Be That an UnUn Is a "UN balanced to UN balanced" matching transformer. /&KWA7{L=D]g0Z!F9;V{zL[h-D,u(.9rg(RHI{f t*C/?? WwS`8o}=n,pjhzRa]Ju/Ru ni4=UvZ:u9*@ Xz+zZcXm}i[Z;Z>.u!*eQVjucXeqYZnSJu)U[n>>KXzZ.Lz sqxcGj]%q}i6=-?YTlnZXV6}=U >5`ZNxChzRa]JU.6TVr6a] (A t0 B) Fold over 6 to 8 inches and twist it together. This is a followup video to #344 where I assembled the 49:1 UNUN kit from HF-Kits / ARRL. It's an efficient way to get all the multiples Theme: Newsup by Themeansar. Designed for those who want the maximum isolation and choking across the full HF spectrum. 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. 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. Repeater Basics A 50 foot run of RG-8X coax connected the antenna into the LDG Z100-plus tuner and then a Yaesu FT-891A transceiver. 40-30-20-17. Thanks for your answer,I will probably go with the 9:1 then. <>>> The 49:1 End Fed Half Wave Antenna is very popular choice for home & field use, Ideal for limited space and stealth applications. STORE I say run what you got and don't worry about it. endobj 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 . Make sure the beginning few inches of twisted wire is not involved in the winding (i.e., just hanging down from the toroid). The "Super Bullet" End Fed Long Wire Antenna Matcher - 1500/3000 watt rated for Super-Punch of your signal! For typical tuners built into a rig, You are using an out of date browser. Then verify it with your installed antenna and SWR measurements. End fed 9:1 58ft wire and 17ft counterpose wire touching ground. In other endobj So is an essential piece of gear to have. Here Is a 250 Watt Home-Brew That I Made In about an Hour. Save program output in file named 'f', and use 3 0 obj /Name /Im0 X:nzf4p:t;r }~_HOZcX:^$* J^XZuu|"nX/Wkw0hA>y1(z2+v_Xzu[/:^$*m*>hk_:+c{ Several ways exist to bring the wire's high impedance feedpoint closer to the desired 50 ohms, including use of a 49:1 or 64:1 unun, which eliminates the need . 1 0 obj It is important to use a counterpoise. 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 Model 9135 along with one of the wire lengths shown in the Installation Notes. Y &lD30. 40-10m with a 49:1 Unun. I connected it to a 33 wire running from my balcony, through the trees, and ran WSPR overnight to check things out. Vhf and Up SO-239 (UHF female) chassis mount with screws, nuts, lock washers. . I usually go with a 3.2k transformation wire winding ratio of 8:1 which is a final impedance conversion of 64:1 (50ohm * 64 = 3.2k ohm). In stock . Note: My (A to B) length was 6 inches. Power handling is 100 watts CW / SSB & 25W Data modes. An end fed half wave antenna is one of a specific length depending on the frequency that it is to be used on, for example, an end fed half wave antenna for 80 meters is about 130 long. This transformer converts the impedance at the end . https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. Please note that I will not be describing the construction of the antenna wire radiator here. and experiment. This type of antenna is very easy to install because there is no need . The table below represents half wave lengths and multiples that you DO NOT WANT TO USE! Figure 2 Schematic of the 9:1 voltage unun . Hertz Antenna" shows in line 2 of the table that a similarly installed Ham Radio News! If the choices are. 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. The matching unit The impedance at the end of a half wave antenna is somewhere between 2000-5000 Ohms. It may not display this or other websites correctly. When do you use a 1:1, 9:1 or a 49:1 balun? Legal Stuff 1 0 obj Re: 9:1 or 49:1 unun for end-fed long/random wire? The counterpoise wire does not have to be similar in length to the main radiator wire and just a short wire is all that is needed, about 0.05 . Code Practice For best results, use the Wire Length Feet 1.8 MHz 3.7 MHz 5.3 MHz 7.1 MHz 10.1 MHz 14.2 MHz 18.1 MHz 21.2 MHz 24.9 MHz 28.5 MHz 50.1 MHz Wire-Lengths-for-9-1-ununs.pdf Created Date: 12/12/2022 11:20:42 AM . I'm looking forward to getting off work and hitting 40 & 20 meters again!! I made one without doing this and it didn't work so well. N4UJW. Its really an impedance transformer (9:1) to feed a high impedance, end fed (unbalanced) random wire which is likely to be a few hundred ohms, and transform it into something closer to a 50 (unbalanced) coaxial input, hence UnUn. endobj /ProcSet 7 0 R >> If the transformer is used with an externaltuner in conjunction with a single wireantenna typically 130-135 feet in length, power should be reduced on those bands that show an SWR above 1.6 to2:5 withoutthe tuner. 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. The length of enamelled copper wire per winding for the T-200-2 powdered iron toroid core is determined by length per winding = 50mm per turn plus 250mm tails. The random wire antenna is probably one of the least expensive, easiest and cheapest HF antennas to use if you have a tuner and you want to get the "most" out of a length of "random" wire without having to pull out that calculator, doing the math, getting the center insulator built orbought, running the feedline, and all the rest that goes with putting up a more elaborate antenna. The idea Twist the short and long wires together starting at an end of each wire. google_ad_width = 160; /Height 752 EFHW unun Resonant Long Wire 49:1 Transformer With 67' Antenna Wire. Longer wire is always more 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. The kit includes the parts needed to construct a 49:1 impedance matching network, which will transform the impedance to 50 Ohms, which will suit most transceivers. You can take one of these 49:1 transformers and use the 468/freq (Mhz) formula to calculate the length you need in feet. One end goes straight into the The beauty of the halfwave antenna is it's a complete antenna in the sense it needs no counterpoise. This transformer is designed to be used with an end fed half wavelength of wire only. 35. I made just a touch over 100 QSOs today with the new unit. 6 Screws/ Nuts/ Washers/Wing Nuts And Ring Connectors, 1 X Mica Capacitors 100pF 500V 5%(Mouser Electronics), 1 x 4 in. UNUN 9:1 or 4:1- 3kW ICAS This is is dual 9:1 and 4:1 UNUN used for popular "non-resonant" length END FED wire antennas or verticals like 27 or 43 feet. Random wire lengths you should and should not use! CQ-Calling All Hams! 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. 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. A success! 35-43, 49-63, 70-85. 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. I used 2000 and 1000 ohm resistors in series connected to the proper unun wires with alligator clips for a total of 3000 ohms. 2 0 obj Any SWR measurement taken with the transformer at the feedpoint should not exceed 1.5:1withNOtuner in use. For those that enjoy the LNR and Hy Endfed antennas, but want to run more power, Balun Designs now offers an excellent alternative. The length should be calculated based on the lowest frequency to be worked. $119.95. I imported my spools from the US, but I have seen them on Ebay in the UK. This transformer is designed to be used with an end fed half wavelength of wire only. x 4 in. a more capable tuner - see AA5TB's good show chuck, you said ya picked up a 430, did i tell i fried the 0ne i got from you, can anyone point me in the direction of a 2 pill schem for the HG 2879? /Type /Catalog End Fed Antennas. I will also find some sort of heat resistant packing material to help hold the transformer in place. 2 eyehooks with washers and nuts (I used #8 diameter, but size is up to you.) 9:1 Unun 1.5-54MHz 2kW 9132S. Just add or subtract as needed a little at a time toget the best compromise. 73, He had heard good things about 'Balun Designs' so he recommended you. %PDF-1.5 % The key is you want to stay at least 1/2w long but not near 3/4w for any band of interest. The WSPR map is so dense it looks like the US and Europe are just big blobs of color. While these lengths have been shown to work well on many bands, which >> Let the now free end of the short wire hang down from the toroid. This article details the construction of the transformer. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 22.00 + 5.00 Postage. Electronics 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. I won't bore you with all that so the first portion of this still only shows up to the 4th multiple. Bullet 50:450 (9:1) HF Unun, 1.8-61 MHz, 1500 Watts, End Fed Antennas. I wrote a small C program that does just what Jack did, butI used the band edges. A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. (Note: I am not satisfied with this part of the project, so I will describe it here briefly. Click to enlarge. The magic lengths to use with the End Fed longwire is 29, 35.5, 41, 58, 71 and 84 feet I use a 29 foot wire with my PackTenna 9:1 balun for 40m-10m and then add a 28 foot length for better coverage on 80m when needed. endobj A good place to start is the formula 468 / f (MHz) for a 1/2 wavelength wire antenna. One single wire, no solder connections,very simple.all the way from the tuner to the end support. Multiples are on C and /Length 10 0 R HF & Shortwave 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. 35. 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. , This is a partial reprint (with permission) of an excellent series of articles published by KV5R Meet 'Balun One Nine', a small, cost-effective balun. SWR will vary based on topography, wire orientation and use of ground or counterpoise. The following wire connections do not need to be made in the order I described. An Unun is used to match an unbalanced line to another unbalanced line. uR5ucE`_aksLjYT=hzRa]JucX7d}|'}`XRa>X InJack's own words. Alternate connectors and Mounting Options are available in the. I took a literally random length of 14 gauge house wire and attached a banana plug to be shoved into the antenna port of the tuner. >> program or two to do all the dirty work. Hi guys,not really hfu related,but I tought I might ask here as I have my account. 1. 9:1 or 49:1 unun for end-fed long/random wire? The 30 day return period lapsed before I could get the antenna deployed to test it. Our Ask An Elmer panel discuss this question - what's the difference between matching units?Please consider using. Tools Lengths for Long-wire Antennas Jack - VE3EED Recommended lengths: 29 - 35.5 - 41 - 58 - 71 - 84 - 107 - 119 - 148 - 203 - 347 - 407 - 423 Not recommended lengths: 16 - 19 - 22 - 26 - 32 - 33 - 38 - 44 - 46 - 48 - 52 - 64 - 65 - 66 - 76 <> 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. Kj8~q7c? So a 49:1 impedance transformer is needed to match the 50 ohms of the coax at the feed line. Here Is a 250 Watt Home-Brew That I Made In about an Hour. SEARCH Proudly powered by WordPress For a better experience, please enable JavaScript in your browser before proceeding. /ColorSpace 11 0 R 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. ones 10C) for the 10-80 m bands, or even 6-160 m: 17 ft (5.2 m) of twin-lead and 68 ft (20.7 m) of antenna wire (i.e., standard dimensions). 0 I have included a screenshot showing the stations that reported spotting my 200 mw beacon over the last 16 hours. var sc_invisible=1; transmit frequency the impedance is so high that tuners in most rigs The graph below shows lengths to avoid for different collections of bands. are blocked out because an antenna should be at least that long. Here is an ARRL To summarise the results WRT to reference antenna consisting of 30ft wire vertical fed with auto- NOTE: Rewording the previous paragraph, if you have a capable enough Many hams have tried till they are blue in the face to install the random wire antenna that works on most; if not all of the HF bands with terrible results. Tune Around! 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. Midi Music JavaScript is disabled. I actually did this first and before the connector was bolted to the box. Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth. << If you want all the bands from (Originally published February 22, 2021). 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. I plotted the results for the U.S. CW band edges for use with my4 band Elecraft K1 qrp rig. I have not done this yet. Contact %%EOF Part List: This is not exactly a 1/2 wavelength in free space, but works for wire as it has a different velocity factor than "air". endobj For reasons that I do not understand, adding a capacitor between the coax conductor wire (untwisted free end of short wire) and the ground (twisted free ends of long and short wire) can increase the functional bandwidth of the antenna on the higher HF frequencies. 3. 4 0 obj