/ProcSet 7 0 R >> JC[ d8O[UKKQ{yZ{G 'Upno_*~8uo a@G`' zxUHXW&`}mEp`?i0 oE:N0-/t"t.-? it is easy to pack and easy to install. How to Make a Balun or Unun : 3 Steps - Instructables Again, the bands are USA, so change them A good place to start is the formula 468 / f (MHz) for a 1/2 wavelength wire antenna. excellent page for EFHW info - or, addressed below, to cut the wire 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). The fewer bands, the fewer high impedance regions to avoid. STORE BUILD INSTRUCTIONS FOR 49:1 UNUN IMPEDEDENCE TRANSFORMER: WX1MAR and I brought the DIY 49:1 unun with a borrowed antenna radiator wire cut for 20M half-wavelength to Ashland State Park K-2417 in Massachusetts for a Parks-on-the-Air (POTA) activation. 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. Antenna Design Allows the internal tuner of most rigs to tune remotely mounted single wire antennas. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. A standard recommendation (see QST, March 1936, p. 32, "An Unorthodox &nb , This is a partial reprint (with permission) of an excellent series of articles published by KV5R 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 . To DB's point of a single band antenna, this 49:1 transformer is a good choice for a single band matcher. 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. 49:1 or other high ratio transformers are for resonant "cut to frequency" antennas like the traditional zepp/fuchs antenna. 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). tuner the colored bands below are the best lengths as long as your Hope it's clear now, if not. Random wire length for 9:1 unun - fairlawnarc.groups.io Beginning from the 3rd band from the left, the vertical blue lines are: 160M, 80M, 60M, 40M, 30M, 20M, 17M, 15M, 12M, (11M), and 10M bands. SO-239 (UHF female) chassis mount with screws, nuts, lock washers. The counterpoise wire, This transformer is designed to be used with an end fed, Approx. There are so many new frequencies to stay away from, that it gets pretty tricky for the longer wires. UJM-49-1 $56.99 Save up to 6% when you buy more. Post Reviews x 2 in. presents an extremely high impedance to the tu rig, often with no feedline, and the other end in the air attached to <>>> You can take one of these 49:1 transformers and use the 468/freq (Mhz) formula to calculate the length you need in feet. Experimenting by slightly changing the wire length (+ or-) is encouraged to provide best overall performance. The 49:1 End Fed Half Wave Antenna is very popular choice for home & field use, Ideal for limited space and stealth applications. Engineering the EFHW 49:1 Transformer and Antenna This transformer is designed to be used with an end fed half wavelength of wire only. Contact Superglue 2 toroids together. >> This design is excellent for matching both long and short length wire antennas for multiband use. (Also check out AB3AP'Swebsite and say thanks for sharing his skills. 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. Well, I didn't think it would make any difference at that many multiples. Thank you so much for such a great product! /Subtype /Image Wire lengths for the 4:1 ratio in models 4130, 4132, 4134, 4932 and 4935. /BitsPerComponent 8 Superior Essex Heavy build polyamideimide. want the antenna to be at least 1/4 wavelength long for each band you Liquidtight NM 90-Degree Connector(Home Depot). Presented for your consideration by Jack, VE3EED. This Balun Designs unit is replacing an MFj 1982 HP EFHW balun that was DOA when it arrived last May. 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. I have not done this yet. endobj Notice from column f that there is no length giving low impendance for Winding 1:64 Matching Auto Transformer on the FT240-43 core. Midi Music Power handling is 100 watts CW / SSB & 25W Data modes. 1 X FT240-43 Ferrite Toroid Core 43 Material(Mouser Electronics), 1 X SO-239 UHF PANEL JACK S/CUP SO-239(Mouser Electronics), No. The idea I used the RigExpert Zoom AA-55 to test VSWR of the 49:1 unun impedance transformer. all US ham bands. PVC Junction Box(Home Depot), 1 x 1/2 in. 35. License Study In another life, I could have been a telephone engineer. Q Each vertical blue line represents an amateur radio band. Repeater Basics Vhf and Up $1YacO5Q}YC\>qZ } The graph below shows lengths to avoid for different collections of bands. /Resources << If you plan on stringing up a dipole you use 2 equal lengths of wire with the Balun in the middle. Ham Radio End Fed Antenna with a 1:64 Matching Network Our newdesign isperfect for matching both long and short length wire antennas for multiband use. $119.95. (wlSR9dJ_x%+VHX4FRr 3>;g^x%g'wkJu,i~#Q"2|WGf[!_m]#&1$)R.{--" 'dGO;=_B$T}". You'll want to have that wire up as high as you can get.. 1 0 obj 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 actually did this first and before the connector was bolted to the box. Wait a few minutes for glue to set. Home-brew End-Fed 49:1 UnUn. - KA9QJG Repeaters After winding #2 is made and extends down the backside of the toroid, untwist the wires. endstream EFHW unun Resonant Long Wire 49:1 Transformer With BNC or SO-239 I wrote a small C program that does just what Jack did, butI used the band edges. Some important and helpful references I used for this work: https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. Alternate connectors and Mounting Options are available in the. %%EOF Humor Code Practice A 49:1 would match 50 ohms to about 2,450 ohms and a 64:1 matches to 3,200 ohms, typical of a 1/2 wave end fed. random wire should use 423/f. RFI Tips and Tricks In total 29 contacts were made from British Columbia to Texas to Florida in 40 minutes on 20M. We do not encourage any radio operations contrary to regulations. It will be good for 15m, and 10m. https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. Nelson Antennas 9:1 balun - eHam.net For instance, to work 40m be sure the antenna is at least 10m or 33' long. June 8, 2022 at 9:17 am. 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. End Fed Half Wave Antenna Coupler Schematic - 7-30MHz. Just add or subtract as needed a little at a time to get the best compromise. A 9:1 matches 50 ohms to 450 ohms and that turns out to be an ok compromise for feeding 50-100ft of wire for general purpose SW receive. endobj Antenna Safety! 2 0 obj google_ad_slot = "1982258389"; Meet 'Balun One Nine', a small, cost-effective balun. The table below represents half wave lengths and multiples that you DO NOT WANT TO USE! The vertical (y-) axis shows the VSWR and the horizontal (x-) axis shows the frequencies. Multiples are on C and /Count 1 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. Picture 1 of 9. 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 Part List: hb```YloD@(aKI V!}g@~}%Q/[[~_=Wy-:O)x[~hs/~SGeG _QE C6q %r Random Wire Antennas - Best Lengths To Use For Random Wire 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. 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. The QRP End-Fed Half-Wave Antenna 49:1 Transformer However, the radio didn't tune up very well on 15 meters. 49:1 Impedance Transformer for EFHW Antenna - DX Explorer Anyway, an old friend mentioned 'MyAntenna.com' but they were closed for the summer. 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. PDF Wire-Lengths-for-9-1-ununs - OM0ET SWR will vary based on topography, wire orientation and use of ground or counterpoise. JavaScript is disabled. 32.00. multiples, and of course different band combinations yield different Both were on 20 meters at 97 watts, Icom 7300. 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 If you want all the bands from The QRP End-Fed Half-Wave Antenna 49:1 Transformer Building a great impedance transformer for Ham Radio end-fed wire antennas. %PDF-1.5 % So for example 80m could range in length from 120 to 133 feet. Hertz Antenna" shows in line 2 of the table that a similarly installed 25 0 obj <> endobj Free Postage. You also END FED "RANDOM WIRE" HF DIPOLE 9:1 ANTENNA RELACEMENT ELEMENT ONLY $28.99 Save up to 6% when you buy more. 4 0 obj This may not be relevant to HF stuff, but the antenna I use for NDB reception has a 400:1 transformer (20:1) turns ratio. DIY 49:1 Unun Impedance Transformer For End-Fed Half Wave (EFWH 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. Reading Room endstream endobj startxref 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- endobj The trick, therefore, is either 2 0 obj Make sure the beginning few inches of twisted wire is not involved in the winding (i.e., just hanging down from the toroid). "Just received my new 64131 yesterday and was anxious to see how well it performed. Drill a hole in one side for the antenna radiator wire mount (for a #8 bolt in my build). 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. Using a 49:1 transformer shoot for the best 50 match @ appx 2450 load over your working frequency bands. var sc_invisible=1; Therefore, we came up with the following numbers to avoid (IN FEET): These lengths in the table beloware the culprits that cause all of the trouble when using random lengths. So, having nothing better to do one day, I re-did the calculations going out to 500 feet. SEARCH While these lengths have been shown to work well on many bands, which /Creator (XnView) My homemade 49:1 EFWH with a 60 wire (cut for 40M) would do just fine! Product Reviews this The length should be calculated based on the lowest frequency to be worked. uR5ucE`_aksLjYT=hzRa]JucX7d}|'}`XRa>X Usually any wire length that is non resonant, like those shown above, will work with the 4:1 ratio. Drill a hole in the top for an eyehook (to be used to secure the unun to whatever it is you want to hang it from.). Ask Elmer 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. You will note that when comparing my results with VE3EED that some of the results are a bit different. Links /Length 6 0 R /CropBox [0 0 748 752] 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. /Type /Catalog 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. The First Thing New Hams Often Ask:What Is An UnUn? Balun Designs. Lengths to avoid are not always the same as << plan to use. It is optimized for 3.5/7/10/14 MHz but will work reasonably well on all amateur bands from 80 meters thru 10 meters with a 135 foot length of wire and a short connection to ground. (A t0 B) Fold over 6 to 8 inches and twist it together. Weight: 0.380 lbs. /Parent 3 0 R so that it is not a halfwave multiple of any frequency you want to use. FCC Information Cut a 4 foot length of AWG #18 enameled wire. We recently found some good information about random wire lengths that you should and should not use. For example, when adding a 1/4w tiger tail to a 2m ht with a halfwave for antenna will likely show no improvement at all in tx or rx strengths. We'd really appreciate it! VSWR analysis of the antenna in the field showed that VSWRs between 3-5.5 from 40M to 10M. 3 0 obj The 49:1 impedance transformer will help you bring down the high impedance of your resonant EFHW antenna to almost 50 Ohm. As typically Power Handling (CW/SSB): 100 W/200 W Enclosure Width: 2.500 in. /Width 748 /XObject << /Im0 9 0 R >> doing the initial 468/f on C and D scales. thank you. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. In fact, the 9:1 unun that I built is actually an autotransformer. endobj <> ", KiwiSDR Online Radio - 500 ft Northeast Beverage, KiwiSDR Online Radio - 400 ft South Beverage, KiwiSDR Online Radio - 10/11m dipole up 20 meters high. google_ad_width = 160; If the choices are. 3 0 obj Prescott Hamfest - W7YRC A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. There are numerous configurations available online that will accomplish this on multiple bands (Google search "end fed half wave antennas"). bands you're intested in in a vector like the example below, by typing. I connected the free twisted end of the short and long wires (the ground) the chassis wire (ground) of my homemade testing jig with alligator clip. 35-45, 54-64, 67-77. Vacation Closure - See Homepage for Next Availability. 31 unavailable, a random wire can save the day, but it is important to These dimensions were derived from modelling the antenna in EZNEC. %PDF-1.7 << >> In stock . Use only the white gaps for your antenna lengths, and if bands as possible. Hopefully these random wire length calculations will help us all make this "easy" antenna work better! When do you use a 1:1, 9:1 or a 49:1 balun? However, the list has been revised and is good for wires as long as 500 feet. The 9:1 may work best with that length wire and a tuner, but some say that length is undesirable for the hf HAM bands. End Fed Half Wave Wire Antennas | N6CC V#X~[Z?\ZcX:-Y?&Y?IqTnayZ{jTZOub}=UTWu1G>o.,RaT c=W>:sECXTkc=X /Type /Pages nelson_antennas | eBay Stores This is a followup video to #344 where I assembled the 49:1 UNUN kit from HF-Kits / ARRL. I used 2000 and 1000 ohm resistors in series connected to the proper unun wires with alligator clips for a total of 3000 ohms. << 1:64 vs 1:49 balun for an end fed?? : r/amateurradio - reddit used by hams for dipole lengths. google_ad_height = 600; 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 EFHW unun Resonant Long Wire 49:1 Transformer With BNC or SO-239 | Mobile Phones & Communication, Radio Communication Equipment, Antennas | eBay! 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? 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. A VSWR sweep of the unun after adding a 100pF capacitor shows an SWR <5:1 from 160M to 10M. u?X`f0&/Ri;W0Tn_*TX:ug Even better would be shortening to 53'. 40-30-20-17. 40-30-20-15m bands for my 4 band Elecraft K1 qrp rig. The length of a half wave antenna is calculated using the following formula: L (ft) = 468 / f (freq in mhz). installed, it is a compromise antenna but great for portable use because You need to use these lengths and the longer ones . Turns 1 through 14 are secondary windings (the long wire). The major point of this message is to tell you that approximately 20 minutes after I connected the balun unit to the antenna, I made contact with a gentleman in Italy-my first European contact!! x {avla[g#+yt]Mk"B` xp[AO8;c=\b}|8p4cSmzgU7be,+i5ci6uq.x T/s@9uk-oZX;u`=U >8rsIXW B:uUVr6a] For example a 32 foot length is actually a half wave on 20m with an impedance of about 3500 ohms and requires a 50:1 balun. This calculates to 4.2 m or 14 ft for an 80m end-fed. What these lengths are depend on your tuner and also the wire's surroundings and also the ground system. and experiment. 4 0 obj endobj Figure 2 Schematic of the 9:1 voltage unun . 49:1 UNUN Transformer 2 Kw 160 - 40 m - Wire Antennas The unun was floating at about 15 feet above ground. >> 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. google_ad_client = "ca-pub-9377297764300878"; ?7{*. Technical specification : Type : 49:1 Unun Frequency : 1.81 MHz - 30MHz Impedance ratio: 1:49 Input Impedance: 50 Output Impedance: 2500 Power Handling (CW/SSB) : 250W Core Type : 1x FT240-43 by Fair-rite Co. Capacitor 100pF 3KV Assembled and tested. Usually any wire length that is non resonant on the band or bands desired will work with the 4:1 ratio. I'm not saying aliens are in the radio, but aliens definitely are in the radio. 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] 40-10m with a 49:1 Unun. 75/80 METER RESONATOR KIT FOR THE UJM-EFHW-40-10 200W 40-10m ANTENNA I will also find some sort of heat resistant packing material to help hold the transformer in place. stream 3 0 obj well, the main antenna wire goes to the 9:1 UnUn "+" connector, the vertical counterpoise (insulated !) 1. That is the 10th multiple of a half wave on 15 meters. A so-called random wire antenna is an end fed antenna. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> SWR was good after cutting the wire to appropriate length. 9 0 obj I'm looking forward to getting off work and hitting 40 & 20 meters again!! 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. <> /Height 752 This will be for an eyehook in order to provide strain relief for the radiator wire. "I received my third balun from Balun Designs this afternoon. Privacy Policy https://www.kb6nu.com/playing-end-fed-wire-antennas-91-ununs/, http://www.hamuniverse.com/randomwireantennalengths.html, https://www.youtube.com/watch?v=sty7RlXQoJI, https://www.youtube.com/watch?v=WwJnXTVUrgI, Quote from: refmo on October 15, 2019, 2036 UTC, Quote from: joczo on October 16, 2019, 0815 UTC, http://www.w3pga.org/Antenna%20Books/Reflections%20III.pdf, http://www.arrl.org/files/file/Technology/tis/info/pdf/7007024.pdf, http://www.tasrt.ca/AntennaTips/AntennaTips.htm, http://www.wb2rcb.com/documents/balunlin.pdf. The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. 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. 49:1 vs. 9:1 Transformer for RX only? - RadioReference.com Forums Twist the short and long wires together starting at an end of each wire. This is a 4:1 Current Balun.That means it can match a 200ohm antenna to a 50 feed line. An end fed antenna consists of a wire fed on its end, the length of that wire is not resonant with any frequency or frequencies you will be using it on. That's it in a nutshell..or is it? 3 to31 MHz - up to 1kW intermittent (50% duty cycle). This homebrew 49:1 impedance transformer is the heart of any EFHW antenna you will build, most of the time. 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). IMG_2.jpg Step 2: Take the 6 feet of 18 gauge enameled copper wire, measure 11" from one end and fold it back. /&KWA7{L=D]g0Z!F9;V{zL[h-D,u(.9rg(RHI{f t*C/?? 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. . frequencies for your country or favorite modes. 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. are easily converted to half wavelengths by the famous 468/f generally Figure 3 Wiring of the 9:1 voltage unun. >> I included the tools I used to analyze the transformer as well; this is only necessary if you are interested in analyzing your project. is that for a given ham band there are min and max frequencies which The 49:1, shown in my previous message, is meant for the EFHW that are fed close to or on the half wave (highest impedance) point. 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. PDF Recommended wire lengths and Installation Notes for Unun models 4932 these are the worst lengths and you want to be as far from colored Kj8~q7c? PDF 33ft Verticals and 4:1 Ununs - G8JNJ 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. Multi-band end-fed - Nonstop Systems Performance is ASTOUNDING, far exceeding my expectations. /Title (Wire-Lengths-for-9-1-ununs.pdf) 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. Powered by BigCommerce. At this point, Ive only used the 49:1 tap, but plan to take the 64131 whenever I operate portable. 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. Typically unbalanced = 50/75 ohms too unbalanced = 450/675 ohms. PDF Wire Lengths for 4 and 9-1 Ununs - Balun Designs I use this 8010 EFHW at home, too. endobj In the first year using this unun with a random length endfed wire (Aluminum Elec fence wire at that) I managed to confirm WAS via LoTW on 10m, 15, 17, 20, 30, 40, 80. . Palomar Engineers employs a dual core matching system that offers wide bandwidth (1-61 MHz), 500 watt PEP rating, and a connection for a counterpoise or ground if desired. % Turns 1 & 2 are primary windings (the short wire). PDF portable multi-band End-Fed Half Wave (EFHW) antenna for 40-10m 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. Start winding the toroid with the twisted wires at loop #1 (see schematic below).
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