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Both were on 20 meters at 97 watts, Icom 7300. Antenna") is an 84' long end fed and a 17' long counterpoise (6.5' for 20m). 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. 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. % /Title (Wire-Lengths-for-9-1-ununs.pdf) Site Map 40-30-20 . 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. 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. I have included a screenshot showing the stations that reported spotting my 200 mw beacon over the last 16 hours. /Subtype /Image For instance, to work 40m be sure the antenna is at least bands as possible. are easily converted to half wavelengths by the famous 468/f generally Ham Radio News! google_ad_slot = "1982258389"; plan to use. Save program output in file named 'f', and use Hi guys,not really hfu related,but I tought I might ask here as I have my account. uR5ucE`_aksLjYT=hzRa]JucX7d}|'}`XRa>X 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. Wait a few minutes for glue to set. endobj 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. 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. 1 0 obj . CQ-Calling All Hams! Using a 49:1 transformer shoot for the best 50 match @ appx 2450 load over your working frequency bands. JavaScript is disabled. To DB's point of a single band antenna, this 49:1 transformer is a good choice for a single band matcher. random wire should use 423/f. /Type /Catalog 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. 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.). X:nzf4p:t;r }~_HOZcX:^$* J^XZuu|"nX/Wkw0hA>y1(z2+v_Xzu[/:^$*m*>hk_:+c{ %PDF-1.5 The 49:1 impedance transformer will help you bring down the high impedance of your resonant EFHW antenna to almost 50 Ohm. 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. The "Super Bullet" End Fed Long Wire Antenna Matcher - 1500/3000 watt rated for Super-Punch of your signal! You can take one of these 49:1 transformers and use the 468/freq (Mhz) formula to calculate the length you need in feet. these are the worst lengths and you want to be as far from colored Note: My (A to B) length was 6 inches. 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. . well, the main antenna wire goes to the 9:1 UnUn "+" connector, the vertical counterpoise (insulated !) At multiples of half wavelengths of the It's an efficient way to get all the multiples SEARCH multiples, and of course different band combinations yield different That's it in a nutshell..or is it? 748 0 0 752 0 0 cm /ProcSet 7 0 R >> 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 example, SWR will vary based on topography, wire orientation and use of ground or counterpoise. This article details the construction of the transformer. 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. (Also note that here may be instances where the suggested lengths may not work exactly due to the many variables in the surroundings of the antenna, wire length variances, your tuner, it's height above ground, it's construction, etc. Longer wire is always more I will also find some sort of heat resistant packing material to help hold the transformer in place. 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. If the choices are. He was so impressed that he purchased a 9:1 unit from you, his will be delivered Saturday. You'll want to have that wire up as high as you can get.. Use with other lengths can potentially damage the transformer depending on power level in use. Experimenting by slightly changing the wire length (+ or-) is encouraged to provide best overall performance. Theme: Newsup by Themeansar. Use with other lengths can potentially damage the transformer depending on power level in use. 40-30-20-15m bands for my 4 band Elecraft K1 qrp rig. For instance, to work 40m be sure the antenna is at least 10m or 33' long. A success! About Hamuniverse Downward impedance transformation by factor of 49. 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. One end goes straight into the Humor As typically (The numbers aboveare a great start, thanks to Jack and Mike! Support The Site endobj The key is you want to stay at least 1/2w long but not near 3/4w for any band of interest. 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. Lowest Band of Operation: 160 meters Highest Band of Operation: 10 meters Additional Information LDG Electronics RU-9:1 Unun This is a 4:1 Current Balun.That means it can match a 200ohm antenna to a 50 feed line. /Count 1 Just add or subtract as needed a little at a time toget the best compromise. Our newdesign isperfect for matching both long and short length wire antennas for multiband use. results. The fewer bands, the fewer high impedance regions to avoid. config file by typing gnuplot rw.gnu. /Resources << 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 . This transformer is designed to be used with an end fed half wavelength of wire only. Two pieces of 14 gauge enameled wire (e.g., Thermalese), one short piece (about 1 foot in length) and one long piece (about 7 feet in length). 40-30-20-17. Electronics Make sure the beginning few inches of twisted wire is not involved in the winding (i.e., just hanging down from the toroid). /Height 752 Legal Stuff Powered by BigCommerce. Privacy Policy We'd really appreciate it! Meet 'Balun One Nine', a small, cost-effective balun. It is important to use a counterpoise. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. for your country and favorite modes of operation. In addition to multiples, 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. For typical tuners built into a rig, Kj8~q7c? Notice from column f that there is no length giving low impendance for /Length 6 0 R A VSWR sweep of the unun after adding a 100pF capacitor shows an SWR <5:1 from 160M to 10M. 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. Code Practice This was 9m vertically metres up a fishing pole and then about 5.8m out. 0$Ve The ratio doesn't need to be 49:1 2,400 ohm either, other ratios will transform to other impedance. 4 0 obj SBULLET-9U-1500. You have to stay away from a half wavelength on any frequency. The WorldwideDX Radio Forum was originally established in 2001. These dimensions were derived from modelling the antenna in EZNEC. 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. Feeling a bit too lazy to calculate that by hand, however, I wrote a 0 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 . A small ring terminal for 14ga wire that fits these screws would be helpful too. >> 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! Hope it's clear now, if not. SWR was good after cutting the wire to appropriate length. 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. I used 2000 and 1000 ohm resistors in series connected to the proper unun wires with alligator clips for a total of 3000 ohms. /Creator (XnView) /ColorSpace 11 0 R Wire lengths for the 4:1 ratio in models 4130, 4132, 4134, 4932 and 4935. 27.00 (27.00/Unit) Free Postage. The bandwidth where SWR was below 2:1 was about one MHz. I plotted the results for the U.S. CW band edges for use with my4 band Elecraft K1 qrp rig. rig, often with no feedline, and the other end in the air attached to /&KWA7{L=D]g0Z!F9;V{zL[h-D,u(.9rg(RHI{f t*C/?? The following wire connections do not need to be made in the order I described. 75/80 METER RESONATOR KIT FOR THE UJM-EFHW-40-10 200W 40-10m ANTENNA 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. Here's a list of recommended lengths of wire to use with a 9:1 unun. Be sure to review the various lengths in the link below to obtain the lowest SWR across most if not all HF bands. 2 0 obj Superglue 2 toroids together. /Type /Pages The trick, therefore, is either Just add or subtract as needed a little at a time to get the best compromise. On our next windy free day, AA1F and . I say run what you got and don't worry about it. The WSPR map is so dense it looks like the US and Europe are just big blobs of color. Links Clansman End Fed Long Wire Antenna Used. endobj unavailable, a random wire can save the day, but it is important to Part List: Moving the pot up and down gives a feel for the SWR versus antenna impedance sensitivity. (Note: I am not satisfied with this part of the project, so I will describe it here briefly. I did not want to put the transformer in the housing until I tested it. V#X~[Z?\ZcX:-Y?&Y?IqTnayZ{jTZOub}=UTWu1G>o.,RaT c=W>:sECXTkc=X Reading Room Generally an EFHW will be in the range of 2,000 to 5,000 ohms at the very end of the dipole when resonant. JC[ d8O[UKKQ{yZ{G 'Upno_*~8uo a@G`' zxUHXW&`}mEp`?i0 oE:N0-/t"t.-? 35-43, 49-63, 70-85. <> Alternate connectors and Mounting Options are available in the. 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. /Filter [ /FlateDecode ] frequencies for your country or favorite modes. NEMA rated 4x marine grade junction box for outdoor installations. Jack, VE3EED - SK. Here I show finalizing the antenna, getting it in the air, and run. I won't bore you with all that so the first portion of this still only shows up to the 4th multiple. Enclosure Height: 5.000 in. x@ endobj Power Handling (CW/SSB): 100 W/200 W Enclosure Width: 2.500 in. Re: 9:1 or 49:1 unun for end-fed long/random wire? Ask Elmer The other is to provide strain relief for the antenna wire). 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. 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. That type of wire antenna could be lower than 50 ohms at some frequencies and over 2,000 ohms at . RFI Tips and Tricks The transformer usually used with an end fed wire is a 9:1 transformer. So I just wanna say thank-you!! and experiment. Contact I made just a touch over 100 QSOs today with the new unit. 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. End fed 49:1 60ft wire (using coax as the counter poise. [ /PDF /Text /ImageI ] google_ad_height = 600; Let's have a look at a few details on how to build a 49:1 impedance . I'm not saying aliens are in the radio, but aliens definitely are in the radio. The First Thing New Hams Often Ask:What Is An UnUn? The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. AndWhat Is It Used For In Antennas? q Please note that I will not be describing the construction of the antenna wire radiator here. 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. used by hams for dipole lengths. high the other 1.5m (4.5feet). 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. hb```YloD@(aKI V!}g@~}%Q/[[~_=Wy-:O)x[~hs/~SGeG _QE C6q %r << Lengths to avoid are not always the same as x 2 in. 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}". It may not display this or other websites correctly. This is the latest and greatest transformer design for End Fed Half Wave (EFHW) antennas. 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 goal of the impedance transformer is match the 50 ohm impedance of the feedline (coaxial cable) with the potential 3000 to 4000 ohm impedance expected from an end-fed half wave antenna wire radiator. . google_ad_width = 160; 9:1 Unun EF Random Long wire matching Transformer with BNC or SO-239. This calculates to 4.2 m or 14 ft for an 80m end-fed. 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). 1936 article, however, fall in line with 468/f and so is used here. 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!! /XObject << /Im0 9 0 R >> A png image named g.png will be created. 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. , Reprinted with permission of Hamuniverse, this is an excellent explanation of SWR and how to best me Antenna Safety! Well, I didn't think it would make any difference at that many multiples. understand its properties. %PDF-1.4 %PDF-1.7 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. 2. The table below represents half wave lengths and multiples that you DO NOT WANT TO USE! Ham Radio Videos! A way of connecting the analyzer to the transformer. uR5I5z G^u2`j[}+sy9 a more capable tuner - see AA5TB's x {avla[g#+yt]Mk"B` xp[AO8;c=\b}|8p4cSmzgU7be,+i5ci6uq.x T/s@9uk-oZX;u`=U >8rsIXW B:uUVr6a] Figure 2 Schematic of the 9:1 voltage unun . Liquidtight NM 90-Degree Connector(Home Depot). Thus a 1/4 wave for 20m@16ft, 40m@33ft as examples are not going to work. Windings are inserted into Teflon tubes increasingtotal breakdown to 10,000 volts. <> The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. 3 0 obj The length should be calculated based on the lowest frequency to be worked. SO-239 (UHF female) chassis mount with screws, nuts, lock washers. 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. >> Presented for your consideration by Jack, VE3EED.