49:1 unun wire lengths

This undesired reflection of RF power back toward the transceiver is identified as a high voltage standing wave ratio (VSWR or SWR). As typically 7 0 obj Shortwave Listening This type of antenna is very easy to install because there is no need . Do what works best! Each vertical blue line represents an amateur radio band. Quantity: Sold individually. 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. Enclosure Depth: 1.250 in. Drill a hole in one side for the antenna radiator wire mount (for a #8 bolt in my build). Jack, VE3EED, used center frequencies of thebands described in the article above, and I thought it would be nice to use band edges. 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. Turns 1 through 14 are secondary windings (the long wire). this "The Simple Build" 64:1 EFHW antenna transformer (UnUn) Using a 49:1 transformer shoot for the best 50 match @ appx 2450 load over your working frequency bands. In addition to multiples, This was 9m vertically metres up a fishing pole and then about 5.8m out. 40-10m with a 49:1 Unun. 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. 6 Screws/ Nuts/ Washers/Wing Nuts And Ring Connectors, 1 X Mica Capacitors 100pF 500V 5%(Mouser Electronics), 1 x 4 in. 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. The key is you want to stay at least 1/2w long but not near 3/4w for any band of interest. It is important to use a counterpoise. 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. Cannon". 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 most common question I get asked is what is the correct length for my End Fed Long Wire Antenna? (The numbers aboveare a great start, thanks to Jack and Mike! This will be for an eyehook in order to provide strain relief for the radiator wire. endobj 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. Recommended wire lengths for Unun models 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length. and experiment. is that for a given ham band there are min and max frequencies which << you're using different ham bands than in these examples, modify and rerun We recently found some good information about random wire lengths that you should and should not use. Product Reviews Enclosure Height: 5.000 in. The QRP End-Fed Half-Wave Antenna 49:1 Transformer Building a great impedance transformer for Ham Radio end-fed wire antennas. I won't bore you with all that so the first portion of this still only shows up to the 4th multiple. Start winding the toroid with the twisted wires at loop #1 (see schematic below). What these lengths are depend on your tuner and also the wire's surroundings and also the ground system. Here I show finalizing the antenna, getting it in the air, and run. So, having nothing better to do one day, I re-did the calculations going out to 500 feet. 22.00 + 5.00 Postage. 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. (A t0 B) Fold over 6 to 8 inches and twist it together. 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. 40-30-20-15m bands for my 4 band Elecraft K1 qrp rig. Start winding the Matching Auto Transformer, each pass through the center of the core equals one turn. Continue on winding the long wire through the toroid to complete loops 3 through 14 as shown in the schematic below. 9:1 Magnetic Longwire Balun / Unun - M0UKD - Amateur Radio Blog ?7{*. Hope it's clear now, if not. x 2 in. multiples, and of course different band combinations yield different , This is a partial reprint (with permission) of an excellent series of articles published by KV5R 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 NEMA rated 4x marine grade junction box for outdoor installations. If you plan on stringing up a dipole you use 2 equal lengths of wire with the Balun in the middle. Wait a few minutes for glue to set. =======================, More on Random Wire Lengths from Mike, AB3AP (06-29-2012), I was surfing around Hamuniverse.com and found thIs page on random wire antennas: /ColorSpace 11 0 R Thanks for your answer,I will probably go with the 9:1 then. Model 49131 - 49:1 - 80-10m EFHW - Up to 1kW - Balun Designs 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!! HF & Shortwave (Note: I am not satisfied with this part of the project, so I will describe it here briefly. You also want the antenna to be at least 1/4 wavelength long for each band you plan to use. for your country and favorite modes of operation. PDF portable multi-band End-Fed Half Wave (EFHW) antenna for 40-10m A standard recommendation (see QST, March 1936, p. 32, "An Unorthodox Re: 9:1 or 49:1 unun for end-fed long/random wire? 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. frequencies for your country or favorite modes. 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. https://elginradio.wordpress.com/2017/10/17/end-fed-half-wave-antennas/. Wire lengths for the 4:1 ratio in models 4932 and 4935. 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. This design is excellent for matching both long and short length wire antennas for multiband use. One is for the top of the box so that it can be hung up. all US ham bands. endobj 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. random wire page. a more capable tuner - see AA5TB's A small ring terminal for 14ga wire that fits these screws would be helpful too. The fewer bands, the fewer high impedance regions to avoid. AndWhat Is It Used For In Antennas? Y &lD30. My homemade 49:1 EFWH with a 60 wire (cut for 40M) would do just fine! here are values for CW portions of the USA % Continue twisting the entire length of the short wire. Tune Around! << Experimenting with 1:64 and 1:49 end-fed antenna Ununs on - reddit Usually any wire length that is non resonant, like those shown above, will work with the 4:1 ratio. Site Map Work all bands from 80 through 10 on it. recommended on VE3EED's page because I use all halfwave 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. Designed for those who want the maximum isolation and choking across the full HF spectrum. %PDF-1.5 % 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. UJM-49-1 $56.99 Save up to 6% when you buy more. /XObject << /Im0 9 0 R >> 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.). SO-239 connectors are silver plated with Teflon insulation. 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. The length should be calculated based on the lowest frequency to be worked. 9:1 UnUn End Fed Long Wire Lengths - Pretty Simple | ve3ips 49:1 vs. 9:1 Transformer for RX only? - RadioReference.com Forums so that it is not a halfwave multiple of any frequency you want to use. rig, often with no feedline, and the other end in the air attached to 9:1 Unun 1.5-54MHz 2kW 9132S. >> tuner the colored bands below are the best lengths as long as your 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. 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. 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. VSWR analysis of the antenna in the field showed that VSWRs between 3-5.5 from 40M to 10M. | Lowest Band of Operation: 160 meters Highest Band of Operation: 10 meters Additional Information LDG Electronics RU-9:1 Unun high the other 1.5m (4.5feet). 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. To DB's point of a single band antenna, this 49:1 transformer is a good choice for a single band matcher. The idea Best SWR was . Cut a 4 foot length of AWG #18 enameled wire. Picture Information. ones The graph below shows lengths to avoid for different collections of bands. 2 0 obj That is the 10th multiple of a half wave on 15 meters. 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). 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. >> Presented for your consideration by Jack, VE3EED. /&KWA7{L=D]g0Z!F9;V{zL[h-D,u(.9rg(RHI{f t*C/?? That meant calculating all the way to 32 multiples of a half wave on 10 meters. . Recommended wire lengths for Unun Balun - Webclass.org << . Our Ask An Elmer panel discuss this question - what's the difference between matching units?Please consider using. are easily converted to half wavelengths by the famous 468/f generally <>/Metadata 239 0 R/ViewerPreferences 240 0 R>> The "9:1 UNUN" are for random length wire antennas fed at the end. << 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 . 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 /* Ad banner 160 x 600 */ He was so impressed that he purchased a 9:1 unit from you, his will be delivered Saturday. You will note that when comparing my results with VE3EED that some of the results are a bit different. Tools <> These dimensions were derived from modelling the antenna in EZNEC. Repeater Builders Then verify it with your installed antenna and SWR measurements. SBULLET-9U-1500. 49:1 EFHW Antenna 40-10M 100W - M1ECC-Antennas 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. See the picture below. 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. 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. results. Playing with end-fed wire antennas and 9:1 ununs thank you. This is a 4:1 Current Balun.That means it can match a 200ohm antenna to a 50 feed line. Save program output in file named 'f', and use /Im0 Do Just add or subtract as needed a little at a time to get the best compromise. I have included a screenshot showing the stations that reported spotting my 200 mw beacon over the last 16 hours. %PDF-1.4 Picture 1 of 9. The "Super Bullet" End Fed Long Wire Antenna Matcher - 1500/3000 watt rated for Super-Punch of your signal! /Height 752 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 [ /PDF /Text /ImageI ] ), Note that Jack, VE3EED,went SK several years agohe will be missed. Again, the bands are USA, so change them Random Wire Antennas - Best Lengths To Use For Random Wire To summarise the results WRT to reference antenna consisting of 30ft wire vertical fed with auto- 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 . Let the now free end of the short wire hang down from the toroid. 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). %PDF-1.7 <>>> 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. <> 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. Electronics Winding 1:64 Matching Auto Transformer on the FT240-43 core. So for example 80m could range in length from 120 to 133 feet. endstream endobj startxref hb```YloD@(aKI V!}g@~}%Q/[[~_=Wy-:O)x[~hs/~SGeG _QE C6q %r endobj I swept the VSWR of the unun and resistors as described from <1 to 55MHz. EFHW Antenna and 49:1 UnUn | WorldwideDX Radio Forum 32.00. 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. End Fed Antennas. endobj Power handling is 100 watts CW / SSB & 25W Data modes. 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. 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). presents an extremely high impedance to the tu Our newdesign isperfect for matching both long and short length wire antennas for multiband use. 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. Privacy Policy So those are the numbers above thatwe have to stay as far away from as possible when building a long-wire antenna. I made just a touch over 100 QSOs today with the new unit. is helpful if you're in a hurry to get on the air, read up on the topic <> endobj 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 . /Resources << I will also find some sort of heat resistant packing material to help hold the transformer in place. /Name /Im0 EFHW unun Resonant Long Wire 49:1 Transformer With BNC or SO-239 | Mobile Phones & Communication, Radio Communication Equipment, Antennas | eBay! Here Is a 250 Watt Home-Brew That I Made In about an Hour. One single wire, no solder connections,very simple.all the way from the tuner to the end support. /Producer (XnView, http://www.xnview.com) The Nelson antenna 9 to 1 unun did the trick. doing the initial 468/f on C and D scales. Proudly powered by WordPress DIY 49:1 Unun Impedance Transformer For End-Fed Half Wave (EFWH End fed 49:1 60ft wire (using coax as the counter poise. wire lengths less than 1/4 wavelength of the lowest desired frequency x 4 in. 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. The short piece is for the primary winding of the transformer, and the long piece is for the secondary winding of the transformer. In total 29 contacts were made from British Columbia to Texas to Florida in 40 minutes on 20M. We hoisted the free end of the antenna wire approximately 30 feet into a tree. The trick, therefore, is either SSTV well, the main antenna wire goes to the 9:1 UnUn "+" connector, the vertical counterpoise (insulated !) Figure 2 Schematic of the 9:1 voltage unun . Home-brew End-Fed 49:1 UnUn. - KA9QJG Repeaters K1S Valentines Are (Almost) Out The Door! This article details the construction of the transformer. It will be good for 15m, and 10m. Care to buy us a beer? Ham Satellites STORE #347: Quick test of the 40m Halfwave End-Fed antenna using a 49:1 NOTE: Rewording the previous paragraph, if you have a capable enough End Fed Half Wave Antenna Coupler Schematic - 7-30MHz. /Count 1 Custom mix low permeability ferrite by Fair Rite Products for maximum bandwidth. Here's a list of recommended lengths of wire to use with a 9:1 unun. This is not exactly a 1/2 wavelength in free space, but works for wire as it has a different velocity factor than "air". How We Flew An End-Fed Half Wave (EFHW) Ham Radio Antenna On A - KM1NDY Anyway, an old friend mentioned 'MyAntenna.com' but they were closed for the summer. Bullet 50:450 (9:1) HF Unun, 1.8-61 MHz, 1500/3000 Watts, End Fed Long For typical tuners built into a rig, Twist the short and long wires together starting at an end of each wire. This article explains why the use of mix 43 for HF applications is almost always a mistake. SO-239 (UHF female) chassis mount with screws, nuts, lock washers. Wire lengths for the 4:1 ratio in models 4130, 4132, 4134, 4932 and 4935. A png image named g.png will be created. (Also check out AB3AP'Swebsite and say thanks for sharing his skills. 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. 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. HF Antenna Choice 9:1 vs 49:1 vs PAR - Antennas - SOTA Reflector Computer Help The matching unit The impedance at the end of a half wave antenna is somewhere between 2000-5000 Ohms. var sc_invisible=1; Just an FYI that I thought you might be interested in. Note: My (A to B) length was 6 inches. RFI Tips and Tricks The WorldwideDX Radio Forum was originally established in 2001. 80m up, W3EDP's 84' antenna, 17' counterpoise is probably the way to go. Use with other lengths can potentially damage the transformer depending on power level in use. Performance is ASTOUNDING, far exceeding my expectations. That's it in a nutshell..or is it? bands as possible. In other . the program as I did, above, for my K1. endobj Ham Radio Videos! You are using an out of date browser. 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. 9:1 or 49:1 unun for end-fed long/random wire? N4UJW. are blocked out because an antenna should be at least that long. endobj 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. The Short Answer Would Be That an UnUn Is a "UN balanced to UN balanced" matching transformer. 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. Please note that I will not be describing the construction of the antenna wire radiator here. /Type /Catalog 1 0 obj 748 0 0 752 0 0 cm There probably should be some holes for ventilation. Use a slide rule! want the antenna to be at least 1/4 wavelength long for each band you /Parent 3 0 R Here is an ARRL Gil Gruson 1 Campaign | Comines, France $0 USD 0 backers 0% of $3,450 Flexible Goal Follow Story FAQ Updates 0 Comments 0 Prototype The project team has a working demo, not the final product. /Length 6 0 R (Center fed is so appealing because you avoid this.). You can take one of these 49:1 transformers and use the 468/freq (Mhz) formula to calculate the length you need in feet. x][~ XwiH:99gn`1-wz;n[VbW7JH4D]>}>y/D_^7,yyx}s*nveo>mn|6k7GMY4%" M)?O|'opw8o1\5JNe:9hTc5@Ik~aE%O^0$ 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 35-43, 49-63, 70-85. 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. Experimenting by slightly changing the wire length (+ or-) is encouraged to provide best overall performance. 49:1 Impedance Transformer for EFHW Antenna - DX Explorer This Balun Designs unit is replacing an MFj 1982 HP EFHW balun that was DOA when it arrived last May. About Hamuniverse Drill another hole in the same side as the antenna radiator wire mount hole. The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna. //-->, The "Best" Random Wire Antenna Lengths /CreationDate (D:20221212112042) Because I'm more visually oriented I then plotted the many overlapping "red zones" and ended up with the page at: 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. something as high as you can find. It's an efficient way to get all the multiples The table below represents half wave lengths and multiples that you DO NOT WANT TO USE! 2 eyehooks with washers and nuts (I used #8 diameter, but size is up to you.) Unun 9:1 - VK6YSF - Home Page 9:1 Unun EF Random Long wire matching Transformer with BNC or SO-239. excellent page for EFHW info - or, addressed below, to cut the wire The counterpoise wire, This transformer is designed to be used with an end fed, Approx. The bandwidth where SWR was below 2:1 was about one MHz. these are the worst lengths and you want to be as far from colored Tweak the antenna length if necessary and then maybe adjust the turns ratio again. google_ad_height = 600; End-Fed Half-Wave Antenna Kit - American Radio Relay League Prescott Hamfest - W7YRC

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