Drill a hole in one side for the antenna radiator wire mount (for a #8 bolt in my build). About Hamuniverse Wire-Lengths-for-9-1-ununs.pdf Created Date: 12/12/2022 11:20:42 AM . 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 /Pages 3 0 R /Count 1 endobj What these lengths are depend on your tuner and also the wire's surroundings and also the ground system. 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. random wire should use 423/f. In total 29 contacts were made from British Columbia to Texas to Florida in 40 minutes on 20M. I purchased a MFJ-16010 Random Wire Tuner and an LDG RU 1:1 unun. /Type /Catalog 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. Vacation Closure - See Homepage for Next Availability. 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. While these lengths have been shown to work well on many bands, which Start winding the toroid with the twisted wires at loop #1 (see schematic below). Just add or subtract as needed a little at a time to get the best compromise. Random wire lengths you should and should not use! is helpful if you're in a hurry to get on the air, read up on the topic Picture Information. 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. I made one without doing this and it didn't work so well. The unun was floating at about 15 feet above ground. I used 2000 and 1000 ohm resistors in series connected to the proper unun wires with alligator clips for a total of 3000 ohms. 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. My homemade 49:1 EFWH with a 60 wire (cut for 40M) would do just fine! 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. Product Reviews endobj u?X`f0&/Ri;W0Tn_*TX:ug This calculates to 4.2 m or 14 ft for an 80m end-fed. /Parent 3 0 R /MediaBox [0 0 748 752] The length of a half wave antenna is calculated using the following formula: L (ft) = 468 / f (freq in mhz). He was so impressed that he purchased a 9:1 unit from you, his will be delivered Saturday. A level of 500-600 watts is the maximum with a further reduction onany band measuringabove 3:1. 8 0 obj Lengths to avoid are not always the same as x@ 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. q 25 0 obj <> endobj The graph below shows lengths to avoid for different collections of bands. We hoisted the free end of the antenna wire approximately 30 feet into a tree. I made just a touch over 100 QSOs today with the new unit. 40-30-20 . . ?7{*. http://udel.edu/~mm/ham/randomWire/. V#X~[Z?\ZcX:-Y?&Y?IqTnayZ{jTZOub}=UTWu1G>o.,RaT c=W>:sECXTkc=X understand its properties. tuner the colored bands below are the best lengths as long as your 3. End fed 49:1 60ft wire (using coax as the counter poise. << it is easy to pack and easy to install. Weight: 0.380 lbs. "Just received my new 64131 yesterday and was anxious to see how well it performed. This article explains why the use of mix 43 for HF applications is almost always a mistake. 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. A png image named g.png will be created. 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 most important length is one that is non-resonant on any band. Superglue 2 toroids together. Here is an ARRL results. % This type of antenna is very easy to install because there is no need . /Producer (XnView, http://www.xnview.com) You'll want to have that wire up as high as you can get.. <> 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. 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. Use with other lengths can potentially damage the transformer depending on power level in use. A success! 1. They just saved you and I loads of time and frustration. j#f5(fk0?P[polEo5b2-/oVZu1Qo-I6C/M@TbddPc#cdZZ|7+|o{}!F#?Go7ju|?wwgow/c2/W-m~~hn[S29OU}}r7lc]wsw[shS[#qbrrK[7*0,Xv{k+o {=*vo S__O~*=y/zk75O?yjCnXS{`~Ii'c_GxN. For those that enjoy the LNR and Hy Endfed antennas, but want to run more power, Balun Designs now offers an excellent alternative. Building on the original 1:1 design by Dr. Jerry Sevick, this balun has two (2) cores in a stacked Model 49131 - 49:1 - 80-10m EFHW - Up to 1kW, Decrease Quantity of Model 49131 - 49:1 - 80-10m EFHW - Up to 1kW, Increase Quantity of Model 49131 - 49:1 - 80-10m EFHW - Up to 1kW. bands you're intested in in a vector like the example below, by typing. 3 0 obj JC[ d8O[UKKQ{yZ{G 'Upno_*~8uo a@G`' zxUHXW&`}mEp`?i0 oE:N0-/t"t.-? /Kids [ 4 0 R ] 73. JACK, VE3EED Electronics Allows the internal tuner of most rigs to tune remotely mounted single wire antennas. The 49:1 impedance transformer will help you bring down the high impedance of your resonant EFHW antenna to almost 50 Ohm. 4 0 obj The Short Answer Would Be That an UnUn Is a "UN balanced to UN balanced" matching transformer. Generally an EFHW will be in the range of 2,000 to 5,000 ohms at the very end of the dipole when resonant. 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] 6 0 obj 2 0 obj Humor Hi guys,not really hfu related,but I tought I might ask here as I have my account. This transformer converts the impedance at the end . presents an extremely high impedance to the tu Figure 2 Schematic of the 9:1 voltage unun . uR5ucE`_aksLjYT=hzRa]JucX7d}|'}`XRa>X Drill another hole in the same side as the antenna radiator wire mount hole. June 8, 2022 at 9:17 am. One is for the top of the box so that it can be hung up. 35-45, 54-64, 67-77. Thank you so much for such a great product! Well, I didn't think it would make any difference at that many multiples. So, having nothing better to do one day, I re-did the calculations going out to 500 feet. 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. If the choices are. Jack, VE3EED - SK. , Reprinted with permission of Hamuniverse, this is an excellent explanation of SWR and how to best me This article details the construction of the transformer. See the picture below. To summarise the results WRT to reference antenna consisting of 30ft wire vertical fed with auto- To DB's point of a single band antenna, this 49:1 transformer is a good choice for a single band matcher. installed, it is a compromise antenna but great for portable use because 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 numbers aboveare a great start, thanks to Jack and Mike! Presented for your consideration by Jack, VE3EED. "Can you please recommend schematics that are designed to tune setups like these? >> 3 to31 MHz - up to 1kW intermittent (50% duty cycle). 22.00 + 5.00 Postage. you're using different ham bands than in these examples, modify and rerun >> 27.00 (27.00/Unit) Free Postage. 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. I included the tools I used to analyze the transformer as well; this is only necessary if you are interested in analyzing your project. Each vertical blue line represents an amateur radio band. >> random wire page. This homebrew 49:1 impedance transformer is the heart of any EFHW antenna you will build, most of the time. answers on D - one setting. <> So those are the numbers above thatwe have to stay as far away from as possible when building a long-wire antenna. /ColorSpace 11 0 R As typically A VSWR sweep of the unun after adding a 100pF capacitor shows an SWR <5:1 from 160M to 10M. Vhf and Up SBULLET-9U-1500. 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 . I say run what you got and don't worry about it. 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. Part List: Theme designed by Papathemes. I have not done this yet. Swr usually is all over the place and the tuner will just not do it's job. 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. I have included a screenshot showing the stations that reported spotting my 200 mw beacon over the last 16 hours. << Continue on winding the long wire through the toroid to complete loops 3 through 14 as shown in the schematic below. 1936 article, however, fall in line with 468/f and so is used here. %PDF-1.5 % 40-30-20-17. 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). (Note: I am not satisfied with this part of the project, so I will describe it here briefly. I wrote a small C program that does just what Jack did, butI used the band edges. Theme: Newsup by Themeansar. 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. &nb You need to use these lengths and the longer ones . End Fed Antennas. 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. Both were on 20 meters at 97 watts, Icom 7300. Winding 1:64 Matching Auto Transformer on the FT240-43 core. 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. 73, An Unun is used to match an unbalanced line to another unbalanced line. 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. Midi Music These dimensions were derived from modelling the antenna in EZNEC. Contact 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. I use this 8010 EFHW at home, too. Computer Help x 4 in. 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. 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. The fewer bands, the fewer high impedance regions to avoid. This Balun Designs unit is replacing an MFj 1982 HP EFHW balun that was DOA when it arrived last May. We do not encourage any radio operations contrary to regulations. Proudly powered by WordPress rig, often with no feedline, and the other end in the air attached to /CropBox [0 0 748 752] https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. 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). <> Change the program to use 423 if desired.) Lowest Band of Operation: 160 meters Highest Band of Operation: 10 meters Additional Information LDG Electronics RU-9:1 Unun A so-called random wire antenna is an end fed antenna. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. Kj8~q7c? endobj endobj I attached the toroids to a PVC DWV test cap with 3 cable ties. Wire lengths for the 4:1 ratio in models 4932 and 4935. endobj The counterpoise wire, This transformer is designed to be used with an end fed, Approx. While I have not done so yet, I plan on gluing the test cap to the back of the junction box. /Height 752 Typically unbalanced = 50/75 ohms too unbalanced = 450/675 ohms. << 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. 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. <> That is the 10th multiple of a half wave on 15 meters. Windings are inserted into Teflon tubes increasingtotal breakdown to 10,000 volts. Tune Around! I actually did this first and before the connector was bolted to the box. 10m or 33' long. /* Ad banner 160 x 600 */ /ModDate (D:20221212112042) Having the option to switch rapidly between 49:1 and 64:1 should prove to be a really nice feature.. The popular End-Fed Half-Wave (EFHW) Antenna is an easily portable, high-impedance (2,000-4,000 ohm) wire antenna that resonates on its fundamental frequency and all harmonics above. Be sure to review the various lengths in the link below to obtain the lowest SWR across most if not all HF bands. is that for a given ham band there are min and max frequencies which END FED "RANDOM WIRE" HF DIPOLE 9:1 ANTENNA RELACEMENT ELEMENT ONLY $28.99 Save up to 6% when you buy more. endobj 1 0 obj /BitsPerComponent 8 . 32.00. Just add or subtract as needed a little at a time toget the best compromise. 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 . SO-239 (UHF female) chassis mount with screws, nuts, lock washers. Jack, VE3EED, used center frequencies of thebands described in the article above, and I thought it would be nice to use band edges. A way of connecting the analyzer to the transformer. We are working every day to make sure our community is the best Radio Hobbyist's site. 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. Here they are in order: for your country and favorite modes of operation. Coverutilizes integralneoprene gasket for weatherproof integrity. When do you use a 1:1, 9:1 or a 49:1 balun? Stacked coreswithwinding configured as 49:1auto transformer. /Type /XObject Cannon". program or two to do all the dirty work. a more capable tuner - see AA5TB's /ProcSet 7 0 R >> This design is excellent for matching both long and short length wire antennas for multiband use. 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 /Title (Wire-Lengths-for-9-1-ununs.pdf) 9:1 Unun 1.5-54MHz 2kW 9132S. . 6 Screws/ Nuts/ Washers/Wing Nuts And Ring Connectors, 1 X Mica Capacitors 100pF 500V 5%(Mouser Electronics), 1 x 4 in. 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". NEMA rated 4x marine grade junction box for outdoor installations. ", KiwiSDR Online Radio - 500 ft Northeast Beverage, KiwiSDR Online Radio - 400 ft South Beverage, KiwiSDR Online Radio - 10/11m dipole up 20 meters high. Multiples are on C and I used the RigExpert Zoom AA-55 to test VSWR of the 49:1 unun impedance transformer. The length should be calculated based on the lowest frequency to be worked. 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. I swept the VSWR of the unun and resistors as described from <1 to 55MHz. Each winding is counted when the wire enters through the center hole of the toroid. wire lengths less than 1/4 wavelength of the lowest desired frequency 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. (wlSR9dJ_x%+VHX4FRr 3>;g^x%g'wkJu,i~#Q"2|WGf[!_m]#&1$)R.{--" 'dGO;=_B$T}". Clansman End Fed Long Wire Antenna Used. 75/80 METER RESONATOR KIT FOR THE UJM-EFHW-40-10 200W 40-10m ANTENNA Par EF 20 and par EF 40 (I realize for 17m I would prob just add that band to a 49:1 balun) That's that my question is. Again, the bands are USA, so change them 4 0 obj google_ad_client = "ca-pub-9377297764300878"; endobj Enclosure Height: 5.000 in. In other Here Is a 250 Watt Home-Brew That I Made In about an Hour. /Type /Page Meet 'Balun One Nine', a small, cost-effective balun. It will be good for 15m, and 10m. 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. google_ad_width = 160; hb```YloD@(aKI V!}g@~}%Q/[[~_=Wy-:O)x[~hs/~SGeG _QE C6q %r So for 80 meters (say 3.525 MHz) this gives you about 133' of wire. I have never tried to transmit through it, but it proved the optimal ratio for receiving with my setup. excellent page for EFHW info - or, addressed below, to cut the wire endstream Note: My (A to B) length was 6 inches. This project assembles a 49:1 ferrite-core ("FT") type #43 transformer that matches 50 ohm input to 2500 ohm end fed antenna. Tools 9 0 obj %PDF-1.4 49:1 or other high ratio transformers are for resonant "cut to frequency" antennas like the traditional zepp/fuchs antenna. A good place to start is the formula 468 / f (MHz) for a 1/2 wavelength wire antenna. Use only the white gaps for your antenna lengths, and if This antenna, which works on 10, 15, 20, and 40 meters, has a very high impedance of around 2,500 Ohms. NOTE: Rewording the previous paragraph, if you have a capable enough 0 35-43, 49-63, 70-85. 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.). bands as possible. N4UJW. /&KWA7{L=D]g0Z!F9;V{zL[h-D,u(.9rg(RHI{f t*C/?? Anyway, an old friend mentioned 'MyAntenna.com' but they were closed for the summer. Modify bands and VSWR analysis of the antenna in the field showed that VSWRs between 3-5.5 from 40M to 10M. transmit frequency the impedance is so high that tuners in most rigs an auto-tuner at the base vs. the same antenna fed a 4:1 balun wound with 75 ohm coax on two separate type 43 ferrite cores and a remotely sited tuner fed via 200ft of low loss LDF2-50 coax vs. a broadband antenna of the same element length. License Study doing the initial 468/f on C and D scales. The "Super Bullet" End Fed Long Wire Antenna Matcher - 1500/3000 watt rated for Super-Punch of your signal! The QRP End-Fed Half-Wave Antenna 49:1 Transformer Building a great impedance transformer for Ham Radio end-fed wire antennas. A Balun is used to match a balanced line to an unbalanced line. (Center fed is so appealing because you avoid this.). I plotted the results for the U.S. CW band edges for use with my4 band Elecraft K1 qrp rig. However, the list has been revised and is good for wires as long as 500 feet. This unit is a Balun Designs, in collaboration with Fair Rite products, has developed what we consider to be the best single core 1:1 feedline isolation balun available today. Our Ask An Elmer panel discuss this question - what's the difference between matching units?Please consider using. 1 bolt for antenna hook up (with nuts, washers, lock washers, and possibly thumb screw; I used #8 diameter, about an inch or so in length.). thank you. A small ring terminal for 14ga wire that fits these screws would be helpful too. Using a 49:1 transformer shoot for the best 50 match @ appx 2450 load over your working frequency bands. %%EOF stream Some important and helpful references I used for this work: https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. The matching unit The impedance at the end of a half wave antenna is somewhere between 2000-5000 Ohms. You will note that when comparing my results with VE3EED that some of the results are a bit different. That meant calculating all the way to 32 multiples of a half wave on 10 meters. AndWhat Is It Used For In Antennas? 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. 49:1 UNUN IMPEDANCE XFORMER FOR END FED HALF WAVE ANTENNA. /Width 748 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 . stream /Length 6 0 R A 50 foot run of RG-8X coax connected the antenna into the LDG Z100-plus tuner and then a Yaesu FT-891A transceiver. At multiples of half wavelengths of the He had heard good things about 'Balun Designs' so he recommended you. 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. On our next windy free day, AA1F and . ), Note that Jack, VE3EED,went SK several years agohe will be missed. However, the radio didn't tune up very well on 15 meters. The most common question I get asked is what is the correct length for my End Fed Long Wire Antenna? 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. shown in the column e. var sc_project=8077274; Continue twisting the entire length of the short wire. unavailable, a random wire can save the day, but it is important to For typical tuners built into a rig, He knew that in order for the tuner to "see" a fairly low swr to work within it's range,that the antenna had to be NOT A HALF WAVE ON ANY FREQUENCY that we wanted to us, because a half wave will give us a very high impedance and the resultingswr into a 50 ohm transmitter!

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