x {avla[g#+yt]Mk"B` xp[AO8;c=\b}|8p4cSmzgU7be,+i5ci6uq.x T/s@9uk-oZX;u`=U >8rsIXW B:uUVr6a] (Note: I am not satisfied with this part of the project, so I will describe it here briefly. That's it in a nutshell..or is it? endstream x][~ XwiH:99gn`1-wz;n[VbW7JH4D]>}>y/D_^7,yyx}s*nveo>mn|6k7GMY4%" M)?O|'opw8o1\5JNe:9hTc5@Ik~aE%O^0$ 0E 'BX2?R!t&^E"3oqbW |${boEU>jU:]bQW?4, u1'^`oQ_4E 0~y L^'y}-RHV8L KSZ?mF4lTv'r^mF|":e}?VdTm7bGR]PchDpb*{*HGJ-m)bC!EX"iM%8L7O7-=jcn+D{_' I HH~v70J^9$.7m]knq)L(UQ%OrK:nn!8*EP 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. This is a 4:1 Current Balun.That means it can match a 200ohm antenna to a 50 feed line. You have to stay away from a half wavelength on any frequency. In addition to multiples, 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). Let's have a look at a few details on how to build a 49:1 impedance . gnuplot Lengths of a half-wave or multiple must be avoided. SWR will vary based on topography, wire orientation and use of ground or counterpoise. 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. Wire-Lengths-for-9-1-ununs.pdf Created Date: 12/12/2022 11:20:42 AM . ones "Here's the word on random-wire antennae.". 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. The "9:1 UNUN" are for random length wire antennas fed at the end. Both were on 20 meters at 97 watts, Icom 7300. A level of 500-600 watts is the maximum with a further reduction onany band measuringabove 3:1. and leave the unun on the ground. The management works very hard to make sure the community is running the best software, best designs, and all the other bells and whistles. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> 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. The counterpoise wire, This transformer is designed to be used with an end fed, Approx. 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. <> %%EOF q A way of connecting the analyzer to the transformer. /Im0 Do Use only the white gaps for your antenna lengths, and if << About Hamuniverse Hopefully these random wire length calculations will help us all make this "easy" antenna work better! doing the initial 468/f on C and D scales. Vacation Closure - See Homepage for Next Availability. 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. This transformer is designed to be used with an end fed half wavelength of wire only. config file by typing gnuplot rw.gnu. /Subtype /Image 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. The Nelson antenna 9 to 1 unun did the trick. Even easier than 1 0 obj 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. This is not exactly a 1/2 wavelength in free space, but works for wire as it has a different velocity factor than "air". This was 9m vertically metres up a fishing pole and then about 5.8m out. Our newdesign isperfect for matching both long and short length wire antennas for multiband use. I used the RigExpert Zoom AA-55 to test VSWR of the 49:1 unun impedance transformer. /Pages 3 0 R PVC Junction Box(Home Depot), 1 x 1/2 in. I'm looking forward to getting off work and hitting 40 & 20 meters again!! However, the list has been revised and is good for wires as long as 500 feet. wire to the UnUn "-" connector and then down to ground there it connects with the two other wires but neither the counterpoise nor the two other wires are connected to ground. One single wire, no solder connections,very simple.all the way from the tuner to the end support. , Reprinted with permission of Hamuniverse, this is an excellent explanation of SWR and how to best me So I just wanna say thank-you!! hbbd```b``^ "Cs;D2 I*`0D;+EVUHy`qml0{YVw`b0i DvkAh |"w I2% ?W%@Fg`` 6 Moving the pot up and down gives a feel for the SWR versus antenna impedance sensitivity. Care to buy us a beer? I did not want to put the transformer in the housing until I tested it. Weight: 0.380 lbs. Use a slide rule! <>/Metadata 239 0 R/ViewerPreferences 240 0 R>> X:nzf4p:t;r }~_HOZcX:^$* J^XZuu|"nX/Wkw0hA>y1(z2+v_Xzu[/:^$*m*>hk_:+c{ 2 0 obj Hope it's clear now, if not. Superglue 2 toroids together. 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. Performance is ASTOUNDING, far exceeding my expectations. Shortwave Listening In another life, I could have been a telephone engineer. 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. /* Ad banner 160 x 600 */ %PDF-1.7 /CreationDate (D:20221212112042) Typically unbalanced = 50/75 ohms too unbalanced = 450/675 ohms. << Use with other lengths can potentially damage the transformer depending on power level in use. 32.00. There probably should be some holes for ventilation. Midi Music 9:1 or 49:1 unun for end-fed long/random wire? <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> Downward impedance transformation by factor of 49. 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. END FED "RANDOM WIRE" HF DIPOLE 9:1 ANTENNA RELACEMENT ELEMENT ONLY $28.99 Save up to 6% when you buy more. uR5I5z G^u2`j[}+sy9 Proudly powered by WordPress for your country and favorite modes of operation. W3EDP's results in the above referenced "Can you please recommend schematics that are designed to tune setups like these? which got me thinking. 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. Multiples are on C and The WorldwideDX Radio Forum was originally established in 2001. The vertical (y-) axis shows the VSWR and the horizontal (x-) axis shows the frequencies. % I made just a touch over 100 QSOs today with the new unit. Experimenting by slightly changing the wire length (+ or-) is encouraged to provide best overall performance. As typically $119.95. Using a 49:1 transformer shoot for the best 50 match @ appx 2450 load over your working frequency bands. To summarise the results WRT to reference antenna consisting of 30ft wire vertical fed with auto- google_ad_slot = "1982258389"; endobj it is easy to pack and easy to install. (A t0 B) Fold over 6 to 8 inches and twist it together. 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. My commercial EFHW is 130 feet long for 80 and up, and my 40 meter homebrew antenna is about . | Meet 'Balun One Nine', a small, cost-effective balun. 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. plan to use. The 30 day return period lapsed before I could get the antenna deployed to test it. /Type /XObject It may not display this or other websites correctly. These dimensions were derived from modelling the antenna in EZNEC. 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. 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. I plotted the results for the U.S. CW band edges for use with my4 band Elecraft K1 qrp rig. << Cut a 4 foot length of AWG #18 enameled wire. Powered by BigCommerce. At this point, Ive only used the 49:1 tap, but plan to take the 64131 whenever I operate portable. I sent him the link to the 49:1 unit to get his feedback. For example, Then verify it with your installed antenna and SWR measurements. 73, The matching unit The impedance at the end of a half wave antenna is somewhere between 2000-5000 Ohms. The 49:1 End Fed Half Wave Antenna is very popular choice for home & field use, Ideal for limited space and stealth applications. HF & Shortwave In stock . I have not done this yet. Picture Information. N4UJW. 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. endobj installed, it is a compromise antenna but great for portable use because Each vertical blue line represents an amateur radio band. . endobj 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. %PDF-1.5 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. Clansman End Fed Long Wire Antenna Used. V#X~[Z?\ZcX:-Y?&Y?IqTnayZ{jTZOub}=UTWu1G>o.,RaT c=W>:sECXTkc=X Legal Stuff If you want all the bands from 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. . Here's a list of recommended lengths of wire to use with a 9:1 unun. Connect this ring terminal to one of the SO239 chassis bolts. &nb often can't match it. I won't bore you with all that so the first portion of this still only shows up to the 4th multiple. I purchased a MFJ-16010 Random Wire Tuner and an LDG RU 1:1 unun. RFI Tips and Tricks 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! (Originally published February 22, 2021). 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. Random wire lengths you should and should not use! 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. Superior Essex Heavy build polyamideimide. 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. I attached the toroids to a PVC DWV test cap with 3 cable ties. 80m up, W3EDP's 84' antenna, 17' counterpoise is probably the way to go. In other /Name /Im0 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. 748 0 0 752 0 0 cm is that for a given ham band there are min and max frequencies which Code Practice So for example 80m could range in length from 120 to 133 feet. /Width 748 is helpful if you're in a hurry to get on the air, read up on the topic The length of a half wave antenna is calculated using the following formula: L (ft) = 468 / f (freq in mhz). 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. This design is excellent for matching both long and short length wire antennas for multiband use. Repeater Basics this This is the latest and greatest transformer design for End Fed Half Wave (EFHW) antennas. For a better experience, please enable JavaScript in your browser before proceeding. 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. 9:1 UnUn End Fed Long Wire Lengths - Pretty Simple. a more capable tuner - see AA5TB's /Contents 5 0 R I used a homemade jig made of an SO239 chassis mount to bare wires, alligator clips, and a coax-jumper with PL259 (UHF male) ends; see picture below. wire lengths less than 1/4 wavelength of the lowest desired frequency 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. . 9:1 Unun 1.5-54MHz 2kW 9132S. Reading Room VSWR analysis of the antenna in the field showed that VSWRs between 3-5.5 from 40M to 10M. The ratio doesn't need to be 49:1 2,400 ohm either, other ratios will transform to other impedance. ?7{*. 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". >> You need to use these lengths and the longer ones . /MediaBox [0 0 748 752] 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 . 3 to31 MHz - up to 1kW intermittent (50% duty cycle). So a 49:1 impedance transformer is needed to match the 50 ohms of the coax at the feed line. Hi guys,not really hfu related,but I tought I might ask here as I have my account. You have to give up a band or two, like 60m and 6m, as A good place to start is the formula 468 / f (MHz) for a 1/2 wavelength wire antenna. >> 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. Post Reviews Tools Jack, VE3EED, hopefully has solved a major headache we all have when we attempt to go thru the trial and error and frustration with getting the random wire to work where WE want it to work. The beauty of the halfwave antenna is it's a complete antenna in the sense it needs no counterpoise. Quantity: Sold individually. (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. /Type /Page A Balun is used to match a balanced line to an unbalanced line. 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. 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. Use with other lengths can potentially damage the transformer depending on power level in use. program or two to do all the dirty work. Drill a hole in one side for the antenna radiator wire mount (for a #8 bolt in my build). used by hams for dipole lengths. Allows the internal tuner of most rigs to tune remotely mounted single wire antennas. Turns 1 & 2 are primary windings (the short wire). 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. Thus a 1/4 wave for 20m@16ft, 40m@33ft as examples are not going to work. K1S Valentines Are (Almost) Out The Door! $1YacO5Q}YC\>qZ } want the antenna to be at least 1/4 wavelength long for each band you SBULLET-9U-1500. Site Map <> Power handling is 100 watts CW / SSB & 25W Data modes. An UNUN is needed to match the high impedance of an end fed antenna (2k-4k ohms range). 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. 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. "Just received my new 64131 yesterday and was anxious to see how well it performed. So you have the freq range of interest and the total length of the wire, figuring out wich balun will be a better match for 50ohm coax should be easy. <>>> Re: 9:1 or 49:1 unun for end-fed long/random wire? 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). /Producer (XnView, http://www.xnview.com) What these lengths are depend on your tuner and also the wire's surroundings and also the ground system. 25 0 obj <> endobj endobj Recommended wire lengths for Unun models 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length. The 49:1 impedance transformer will help you bring down the high impedance of your resonant EFHW antenna to almost 50 Ohm. Computer Help The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. Vhf and Up . InJack's own words. [ /PDF /Text /ImageI ] stream The fewer bands, the fewer high impedance regions to avoid. 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. We pride ourselves on welcoming Radio Hobby enthusiasts of all types, while offering unbiased, informative, and friendly discussion among the members. 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. We are working every day to make sure our community is the best Radio Hobbyist's site. endobj It will be good for 15m, and 10m. 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 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). rig, often with no feedline, and the other end in the air attached to wire is at least 1/4 wavelength. endobj Repeater Builders 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. It is important to use a counterpoise. End Fed Half Wave Antenna Coupler Schematic - 7-30MHz. 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. I use this 8010 EFHW at home, too. 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. One is for the top of the box so that it can be hung up. 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. Ultimately, this housing works fine, but it is heavy and clunky.). End fed 9:1 58ft wire and 17ft counterpose wire touching ground. 4 0 obj I only used two screws instead of four. 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 . Even better would be shortening to 53'. Work all bands from 80 through 10 on it. 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.
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