49:1 unun wire lengths 49:1 unun wire lengths

hbbd```b``^ "Cs;D2 I*`0D;+EVUHy`qml0{YVw`b0i DvkAh |"w I2% ?W%@Fg`` 6 /Height 752 Allows the internal tuner of most rigs to tune remotely mounted single wire antennas. ), Note that Jack, VE3EED,went SK several years agohe will be missed. "Here's the word on random-wire antennae.". /Length 6 0 R endobj For instance, to work 40m be sure the antenna is at least installed, it is a compromise antenna but great for portable use because 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. 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. /Title (Wire-Lengths-for-9-1-ununs.pdf) This article explains why the use of mix 43 for HF applications is almost always a mistake. A Balun is used to match a balanced line to an unbalanced line. 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. wire is at least 1/4 wavelength. This is considered a random wire end fed antenna, not to be confused with a half wave end fed antenna which uses a 49:1 or 64:1 unun and a wire that is a half wave length. A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. /Filter [ /FlateDecode ] Thank you so much for such a great product! Y &lD30. endobj %PDF-1.5 % %%EOF /Name /Im0 Ask Elmer 3 0 obj JavaScript is disabled. About Hamuniverse Swr usually is all over the place and the tuner will just not do it's job. This transformer is designed to be used with an end fed half wavelength of wire only. I sent him the link to the 49:1 unit to get his feedback. 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. Weight: 0.380 lbs. >> multiples, and of course different band combinations yield different Make sure the beginning few inches of twisted wire is not involved in the winding (i.e., just hanging down from the toroid). 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. often can't match it. The 30 day return period lapsed before I could get the antenna deployed to test it. A small ring terminal for 14ga wire that fits these screws would be helpful too. That meant calculating all the way to 32 multiples of a half wave on 10 meters. 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 most important length is one that is non-resonant on any band. This undesired reflection of RF power back toward the transceiver is identified as a high voltage standing wave ratio (VSWR or SWR). 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. 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. <> For typical tuners built into a rig, All you need for a random wire antenna is some wire, your tuner, one or more supports up as high as you can get them to string the wire from the supports to the tuner, at least one or two insulatorsand a little time. endobj Kj8~q7c? For instance, to work 40m be sure the antenna is at least 10m or 33' long. VSWR analysis of the antenna in the field showed that VSWRs between 3-5.5 from 40M to 10M. 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. Here Is a 250 Watt Home-Brew That I Made In about an Hour. 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. /Type /XObject /Count 1 (The numbers aboveare a great start, thanks to Jack and Mike! Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth. 40-30-20 . Designed for use with single wire unbalanced antennas, this new addition is small, compact and perfect for quick portable/emergency installations. Some important and helpful references I used for this work: https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. 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. /XObject << /Im0 9 0 R >> 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. 4 0 obj Ham Satellites 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. | 6 Screws/ Nuts/ Washers/Wing Nuts And Ring Connectors, 1 X Mica Capacitors 100pF 500V 5%(Mouser Electronics), 1 x 4 in. (wlSR9dJ_x%+VHX4FRr 3>;g^x%g'wkJu,i~#Q"2|WGf[!_m]#&1$)R.{--" 'dGO;=_B$T}". I purchased a MFJ-16010 Random Wire Tuner and an LDG RU 1:1 unun. The fewer bands, the fewer high impedance regions to avoid. Attaching a counterpoise wire to the common point of the auto-transformer provides the antenna radiator something to push against rather than the coax shield. These dimensions were derived from modelling the antenna in EZNEC. << 49:1 or other high ratio transformers are for resonant "cut to frequency" antennas like the traditional zepp/fuchs antenna. https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. /Kids [ 4 0 R ] SWR was good after cutting the wire to appropriate length. 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. want the antenna to be at least 1/4 wavelength long for each band you >> The 49:1 impedance transformer will help you bring down the high impedance of your resonant EFHW antenna to almost 50 Ohm. Recommended wire lengths for Unun models 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length. bands you're intested in in a vector like the example below, by typing. //-->, The "Best" Random Wire Antenna Lengths The graph below shows lengths to avoid for different collections of bands. I will also find some sort of heat resistant packing material to help hold the transformer in place. ones Solder a the 100pF capacitor between the center conductor wire and ground wires. Windings are inserted into Teflon tubes increasingtotal breakdown to 10,000 volts. <>/Metadata 239 0 R/ViewerPreferences 240 0 R>> License Study Each winding is counted when the wire enters through the center hole of the toroid. these are the worst lengths and you want to be as far from colored /Width 748 Stacked coreswithwinding configured as 49:1auto transformer. There are so many new frequencies to stay away from, that it gets pretty tricky for the longer wires. HF Underground wiki Radio Hobbyist technical blogHFU Discord EuroPirate ChatPropagation DataTeamspeak Server, TDK CXA-2090 LCD Inverter Module New Old Stock USA Seller $19.99, Shortwave Pirate Radio In North America And Around The World, And Other Signals That Go Bump In The Night, Login with username, password and session length. /Creator (XnView) June 8, 2022 at 9:17 am. Alternate connectors and Mounting Options are available in the. "I received my third balun from Balun Designs this afternoon. <> The length should be calculated based on the lowest frequency to be worked. Built with the same craftsmanship as all our other units, this new model will allow you to either replace your current matching unit or construct a new higher powerend fed half wave antenna. A standard recommendation (see QST, March 1936, p. 32, "An Unorthodox We'd really appreciate it! so that it is not a halfwave multiple of any frequency you want to use. The key is you want to stay at least 1/2w long but not near 3/4w for any band of interest. After winding #2 is made and extends down the backside of the toroid, untwist the wires. Upon further research, I remade it tightly twisting those two separate wires together, just as it shows in archjeb's picture, and it worked surprisingly well. 0$Ve x 4 in. Ham Radio Videos! This is a 4:1 Current Balun.That means it can match a 200ohm antenna to a 50 feed line. frequencies for your country or favorite modes. In addition to multiples, %PDF-1.4 config file by typing gnuplot rw.gnu. I used 2000 and 1000 ohm resistors in series connected to the proper unun wires with alligator clips for a total of 3000 ohms. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. 1 0 obj ?7{*. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. I connected the free untwisted end of the short wire to the center conductor of my homemade testing jig (see tools list) with an alligator clip. 80m up, W3EDP's 84' antenna, 17' counterpoise is probably the way to go. 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. In other google_ad_width = 160; The counterpoise wire, This transformer is designed to be used with an end fed, Approx. 9 0 obj <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 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. 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. Using a 49:1 transformer shoot for the best 50 match @ appx 2450 load over your working frequency bands. So a 49:1 impedance transformer is needed to match the 50 ohms of the coax at the feed line. endobj /Type /Catalog I attached the toroids to a PVC DWV test cap with 3 cable ties. Even easier than This design is excellent for matching both long and short length wire antennas for multiband use. 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. <>>> For those that enjoy the LNR and Hy Endfed antennas, but want to run more power, Balun Designs now offers an excellent alternative. for your country and favorite modes of operation. A so-called random wire antenna is an end fed antenna. /Subtype /Image Downward impedance transformation by factor of 49. Work all bands from 80 through 10 on it. are easily converted to half wavelengths by the famous 468/f generally 35. I wrote a small C program that does just what Jack did, butI used the band edges. Wire lengths for the 4:1 ratio in models 4130, 4132, 4134, 4932 and 4935. A success! Bullet 50:450 (9:1) HF Unun, 1.8-61 MHz, 1500 Watts, End Fed Antennas. << So for 80 meters (say 3.525 MHz) this gives you about 133' of wire. 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. . Here Is a 250 Watt Home-Brew That I Made In about an Hour. var sc_security="1df091cc". They just saved you and I loads of time and frustration. Repeater Builders This project assembles a 49:1 ferrite-core ("FT") type #43 transformer that matches 50 ohm input to 2500 ohm end fed antenna. $1YacO5Q}YC\>qZ } This design is excellent for matching both long and short length wire antennas for multiband use. Contact gnuplot 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. Just add or subtract as needed a little at a time toget the best compromise. You'll want to have that wire up as high as you can get.. Both were on 20 meters at 97 watts, Icom 7300. Be sure to review the various lengths in the link below to obtain the lowest SWR across most if not all HF bands. <> var sc_invisible=1; . Humor 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! CQ-Calling All Hams! Enclosure Depth: 1.250 in. The fewer bands, the fewer high impedance regions to avoid. "Just received my new 64131 yesterday and was anxious to see how well it performed. Shortwave Listening 1 0 obj 49:1 UNUN IMPEDANCE XFORMER FOR END FED HALF WAVE ANTENNA. (Center fed is so appealing because you avoid this.). Click to enlarge. Privacy Policy 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. Tweak the antenna length if necessary and then maybe adjust the turns ratio again. excellent page for EFHW info - or, addressed below, to cut the wire Use with other lengths can potentially damage the transformer depending on power level in use. 3 0 obj Theme: Newsup by Themeansar. , This is a partial reprint (with permission) of an excellent series of articles published by KV5R 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. 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). He had heard good things about 'Balun Designs' so he recommended you. Well, I didn't think it would make any difference at that many multiples. Enclosure Height: 5.000 in. "Can you please recommend schematics that are designed to tune setups like these? Coverutilizes integralneoprene gasket for weatherproof integrity. Lengths to avoid are not always the same as << My homemade 49:1 EFWH with a 60 wire (cut for 40M) would do just fine! SO-239 connectors are silver plated with Teflon insulation. One is for the top of the box so that it can be hung up. 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. >> In total 29 contacts were made from British Columbia to Texas to Florida in 40 minutes on 20M. 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. 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. When on the trail, at Field Day, or whenever a good antenna is Because I'm more visually oriented I then plotted the many overlapping "red zones" and ended up with the page at: You also want the antenna to be at least 1/4 wavelength long for each band you plan to use. it is easy to pack and easy to install. The vertical (y-) axis shows the VSWR and the horizontal (x-) axis shows the frequencies. shown in the column e. var sc_project=8077274; Even better would be shortening to 53'. End fed 49:1 60ft wire (using coax as the counter poise. % For calculating the length of a half wave in metres, I use 141 (MHz) for wire elements. 5 0 obj stream x {avla[g#+yt]Mk"B` xp[AO8;c=\b}|8p4cSmzgU7be,+i5ci6uq.x T/s@9uk-oZX;u`=U >8rsIXW B:uUVr6a] << As typically document.getElementById("copyright_year").innerHTML = new Date().getFullYear(); Placing 3000 to 4000 ohms of resistance between the free end of the twisted portion of wires (the gound) and the free end of the long wire (the wire that connects with the antenna radiator after the 14th winding), can simulate adding an antenna radiator wire to the unun impedance transformer. %PDF-1.5 A 50 foot run of RG-8X coax connected the antenna into the LDG Z100-plus tuner and then a Yaesu FT-891A transceiver. . 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. Winding 1:64 Matching Auto Transformer on the FT240-43 core. /Parent 3 0 R all US ham bands. Our newdesign isperfect for matching both long and short length wire antennas for multiband use. 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. 2 0 obj While these lengths have been shown to work well on many bands, which 6 0 obj understand its properties. Mike ab3ap, Editors note: Many thanks to Jack, VE3EDD (SK)and Mike, AB3APfor sharing their math and computerskills with us. N4UJW. You can take one of these 49:1 transformers and use the 468/freq (Mhz) formula to calculate the length you need in feet. Typically unbalanced = 50/75 ohms too unbalanced = 450/675 ohms. SWR will vary based on topography, wire orientation and use of ground or counterpoise. Theme designed by Papathemes. . 2 0 obj 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 and experiment. 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. I have never tried to transmit through it, but it proved the optimal ratio for receiving with my setup. Technical specification : Type : 49:1 Unun Frequency : 1.8 MHz - 7.3 MHz Turns ratio: 1:7 Impedance ratio: 1:49 Input Impedance: 50 Output Impedance: 2450 Power Handling (CW/SSB/ Digital Modes) : 2Kw of peak power / DM Modes 500 watts Core Type : 3 x FT240-43 by Fair-rite Co. Wire type: Enamel copper wire 2.0 mm (AWG 12) Assembled and tested. Liquidtight NM 90-Degree Connector(Home Depot). 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. 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. I swept the VSWR of the unun and resistors as described from <1 to 55MHz. 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! 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. /Producer (XnView, http://www.xnview.com) 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 . An Unun is used to match an unbalanced line to another unbalanced line. 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. 2 eyehooks with washers and nuts (I used #8 diameter, but size is up to you.) 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. thank you. Yes, with the recent surge in popularity of the end-fed half-wave antenna, the 49:1 balun has also become the defacto ratio for use with them. One single wire, no solder connections,very simple.all the way from the tuner to the end support. Hope it's clear now, if not. 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. <> Here they are in order: well, the main antenna wire goes to the 9:1 UnUn "+" connector, the vertical counterpoise (insulated !) % End Fed Antennas. Thanks for your answer,I will probably go with the 9:1 then. SSTV 31 When you're antenna (or radial) length's an odd multiple of the operating freq, you may not need a balun or even a transmatch. transmit frequency the impedance is so high that tuners in most rigs I connected it to a 33 wire running from my balcony, through the trees, and ran WSPR overnight to check things out. u?X`f0&/Ri;W0Tn_*TX:ug 9:1 Unun EF Random Long wire matching Transformer with BNC or SO-239. Vhf and Up 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 . Generally an EFHW will be in the range of 2,000 to 5,000 ohms at the very end of the dipole when resonant. One end goes straight into the 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. Wait a few minutes for glue to set. 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. Ham Radio News! Save program output in file named 'f', and use 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 . 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