9 1 unun antenna. spreadshirt. It is a random wire antenna that is 29. The 9:1 transformer matches the impedance so the antenna becomes a much better match on all bands. It is commonly used when there is a need to match the impedance of an unbalanced antenna to the impedance of the transmission line. Recommended wire lengths and Installation Notes for Unun models 4932, 4935, 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length. 5 long with a 17 foot counterpoise. In testing the swr with the counterpoise attached, 10 and 12 meters are rather good, but from 15, 17, 20, and 40 meters, the swr was too high. But if it’s a multi band antenna and is not ½ wavelength long on any of the intended bands then a 9:1 unun is necessary. 50; Description: Main wire is 31' and made with "Wireman" 18g a Silky antenna wire. Construction PVC covered 1mm diameter copper wire was used with the view that the thicker insulation may reduce the possibility of insulation puncture due to the higher nominal impedance. <그림 1 Hybrid 9:1 Balun 의 개념도> <그림 2 제작한 Hybrid 9:1 Balun > 그림 2에서 상면에 배치한 트랜스포머가 9:1 UNUN 이고 하면에 배치한 트랜스포머가 1:1 Balun 이다. From there, your radio’s antenna tuner can do the rest. The SWR of Un-Un with a 470 ohm dummy load was measured and better than 1. It may be used with many of your antenna projects where a 4:1 Unun is typically recommended. This design is excellent for matching both long and short length unbalanced long wire antennas for multiband use and will allow the internal tuner of most rigs to match a single long wire antenna. The W1SFR End Fed 35’ Random Wire Antenna with 9:1 UnUn What is a random wire antenna and how does it work? The term “random” infers that you can use any length of wire you want as an antenna, while that basic fact is true, there are some practical considerations. 25mm Enamelled copper wire was used in a triple bifilar winding of 4 turns wound evenly spaced around the L15 ferrite toroid core with the three individual windings wound close together. 5 to 50 MHz. So you’ve decided to homebrew an end-fed ‘Multi-band Sloper‘ antenna that will get you on the air from 160-10m. In fact, the 9:1 unun that I built is actually an autotransformer. With the view to establish a quick and easy multi-band antenna deployment for portable and camping operations a simple long wire antenna with an earth or earth plus counterpoise arrangement with a 9:1 voltage unun is one possible solution. Part Number: Feedline Choke and Mount, 50 ohm Feedlines and Antennas, 1:1 Ratio, 1. This document by Jim Brown (K9YC) is long, but tremendously helpful in understanding baluns, chokes, and reducing RF noise: The 1:9 UnUn is wrongly called a 1:9 BalUn in many sources. 9:1 Ununs are useful between coax and long wires with load impedances near 450 ohms. They said their (facts) were from computer modeling programs, but there was a lot of opinion written their too and a lot of disparaging remarks toward anyone who would stupid enough to Figure 1 Typical 9:1 voltage unun and long wire antenna configuration. The RU-9:1 Unun was designed to allow easy interface of vertical and end fed antennas to the LDG line of Automatic Antenna Tuners. A 9:1 transformer is often used for an end-fed half wave antenna. My coax from the shack is about 22'. Recently, I have had the desire to try my hand at winding toroids. Figure 9 Measured impedance from 0. I built one of these with full success for an elderly ham who also uses a manual tuner and/or his rig tuner which will load so many HF bands 6-160 meters. * Power range: Up to 200 watts PEP. I attached the Unun underneath the soffit at the front of the house and used an eye bolt as a strain relief for the wire. 8 to 30 MHz. It may also be used with many of your antenna projects where a 4:1 Unun is needed. 5 146 162 175 Values in color are best overall lengths to use for optimum HF spectrum coverage. It uses an integral 9:1 voltage balun that matches your unbalanced 50 ohm impedance input to a 450 ohm impedance unbalanced long wire. For best results raise the Bullet matching unit as high as possible (use a tree or vertical support) and then extend the antenna wire horizontally or as an “L” (horizontal with vertical end drop). Like most compromise antennas, you give up some things, in this case, radiated power… to gain other things, like multi-band ease of use. The QRPGuys 40m-10m UnUnTenna is a compact portable wire antenna for backyard or portable SOTA use. I got the inspiration from this web page which includes Antenna Unun 9:1 . Cores used in the Un-Un : Amidon toroid (T200-2, T130-6, FT140-43, FT240-43) You can also feed the antenna remotely through an unun (either a 4:1 or 9:1 unbalanced-unbalanced transformer). 9:1 unun toroid transmission line transformer. The PackTenna Mini Random Wire Antenna combines a 9:1 UNUN, winder and antenna wire in a compact unit that is quick to set up and take down. Opens in a new window or tab. Jul 16, 2011 · An UnUn can significantly reduce the range of SWRs on the coax feedline - and therefore reduce feedline losses - on a majority of bands; All four UnUn designs produced a broadly similar SWR reduction, but with this particular length of antenna the 9:1 UnUn had marginally the best overall performance In this video, we discuss 9:1 End Fed Random Wire Antennas and the use of a counterpoise. I put it up 8 days ago, and have worked 38 countries on 5 of 6 continents. SWR for all lengths should typically be under 2. He used it for his HF vertical fed like an end fed antenna. This 9:1 Unun (450-50 ohms) will easily handle 300 watts and covers 1. 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 50Ω (unbalanced) coaxial input, hence UnUn. But how much more? I’ve The 1:1 balun (common-mode choke) goes between coax and the 9:1, regardless of type. On-air performance is sufficient, not bad for a so simple antenna. Additionally, we go through the process of building a 9:1 An End-Fed 160-10m Long Wire Antenna with a QRO 9:1 Un-un and 1:1 RF Choke Balun. With a reasonably good ATU in the shack, you’ll achieve this and it won’t cost an arm and leg. My antenna length is 41' and my counterpoise is 31'. Recommended Wire Lengths for 9:1 ratio (in feet) for Coverage of 160m through 10m 53 59 72 88. Of course, results will vary depending on the actual load, but with a decent tuner, you'll be able to have fun with this simple impedance transformer with all kinds of random The "9:1 UNUN" are for random length wire antennas fed at the end. * Configuration: 9:1 Recommended wire lengths and Installation Notes for Unun models 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length. 2:1 and in most cases will be under 1. I have just built a 9:1 unun to cover 40 - 10 meters. 5:1 depending on the band, wire length, coaxial cable length, and configuration of wire. When the 9:1 is an unun, however, then polarity Figure 1 Typical 9:1 voltage unun and long wire antenna configuration. This antenna will require the use of a tuner. The antenna wire is attached to a stainless steel stud and the unit has a BNC Oct 3, 2014 · I have a 33' long sloper end-fed antenna. 1 bid · Time left 1d 6h left (Fri, 01:36 AM) +$34. - I use a 1:1 choke - I use counterpoise - I use a 9:1 UnUn I have heard that you should’t use a 9:1 unun on 160m since a high impedance and ha high SWR. I've made several 9/1 for me and for some friends using different materials. When the 9:1 is a balun, then it goes without saying that antenna wires will be two, both equal length (or maybe a loop). 49:1 or other high ratio transformers are for resonant "cut to frequency" antennas like the traditional zepp/fuchs antenna. Graph generated with data from from an AIM 4170C antenna analyser. However as the weather gets colder, I’m wondering if using a 9:1 with a random length would make things easier, (no antenna changes mid activation, would I lose performance? I’ve also heard a 49:1 offers better performance over a 9:1 random wire. In my opinion, this is incorrect because there is no transformation to a balanced antenna system. Currently I use the PAR EF-20 (Mono) and EF-40 (Mono) for my SOTA activations. You can cut the wire to fit your needs. TIP: With a 1:9 UnUn and long wire antenna always use a common mode choke. For some frequencies, a wide-range antenna tuner might be needed. $16. Presumably the ferrite toroid works b Aug 12, 2013 · Building the 9:1 UnUn was fun and I was eager to have a multi-band antenna! This antenna got a lot of bad press among the ‘Antenna Guru’ crowd on E-Ham. Why an Unun? Typically we find two kinds of impedance transformers, balanced and unbalanced. 5MHz~30MHz 대역의 연속내입력( The power rating is at least 1kW of continuous power) 1kW를 Review Summary For : KX3Helper. Today’s project is winding a toroid for 40-10 meters. 1. build a ½ wave mono band antenna then it is necessary to attach a 48:1 unun at the feed point given the extremely high impedance. 0mtr total length end fed wire antenna with a 1:9 voltage unun installed. 8:1 for 160-10m allowing onboard tuners to Feb 7, 2020 · I recently purchased the Nelson 9:1 unun and am VERY SATISFIED! Time Owned: 0 to 3 months. Manual 1:9 UnUn for long-wire antennas. This allows you to position the unun away from the house and then feed the antenna with coax. 50:450 ohm (9:1) Balun or Unun Core Kit, . com/thes Step 3: Wind the 9:1 unun toroidal transformer. Sep 24, 2021 · This happens to be 9:1 SWR or 450ohms. * Enclosure dimensions (WHD): 2. Construction 1. My new antenna consists of the Nelson 9:1, MFJ, RF choke, telescopic HD mast and their lightning surge protector. Feb 11, 2015 · An unun is an impedance transformer, usually 4:1 or 9:1, which matches an unbalanced antenna to a feedline. These are sometimes known as a Magnetic Longwire Balun. SWR values can be as high as 10:1 and low as 1. This model is small and easy to weatherproof for use in the elements. 5KW or 5KW If you run more than 500 watts PEP and need a high power 9:1 unun for Super Bullet (SBULLET -9U 1500) (1. They work well. The feed point of a long-wire antenna is nothing more than a broadband impedance transformer. They have always been a mystery to me. 5MHz to 30MHz of the 23. Mar 10, 2016 · KB9RLW Kevin Loughin has a good YouTube video on his 9:1 unun build. Shortwave listener antennas also can benefit with the 9:1 unun and it will provide a better match than 4:1 ununs – this means quieter noise levels and stronger signals so you can hear distance stations easier. . For optimum results, please use the link below to select best wire length and lowest SWR. 61. 15 shipping estimate. Ununs come in different configurations, such as a 1:1 unun or a 9:1 unun. The 1:9 UnUn is wrongly called a 1:9 BalUn in many sources. LDG RU-9:1 Unun specs: * Ratio: 9:1. NOTE: For the 20w kit, nest the smaller toroid in the center of the larger toroid and treat them as if they are one toroid for the following steps. The antenna comes with 29' of 26 AWG copper clad steel wire with a great "silky" jacket to minimize wire tangle. Polarity is a non-issue with this particular type of balun, it being perfectly symmetrical. And that probably right You don’t get a good SWR on 160 without a tuner. This 9:1 unun does NOT have a End Fed Antenna Options 1. Parts Only. Building a 9:1 UNUN for a random-wire multi-band end-fed antenna using an FT-140-43 toroid instead of the usual T106-2. 5-32 MHz, 1000 watts PEP, end fed/Ladder Line, T2FD antenna Magnetic Long Wire Antenna Matcher (9:1) for SWL, 100 KHz-30 I recently needed to put up a new antenna that could do 160-10 meters for a MARS application. from United Kingdom 50:200 ohm (4:1) Dual Core Current Balun Kit, 1-55 MHz, 1500 watts PEP, for OCF, Loop, Ladder Line Antennas Great Unun for long wires, attach any length of wire to the main unit the longer the better, must be used with a good quality ATU due to the high impedance's present on the feeder. 5 out of 5 stars 684 I recently needed to put up a new antenna that could do 160-10 meters for a MARS application. 1 DXE-UN-43 Multi-Band UNUN for 43 foot Vertical Antennas DXE-UN-43-R Qty Description 1 DXE-UN-43 Multi-Band UNUN for 43 foot Vertical Antennas 1 Aluminum Mounting Bracket for the DXE-UN-43 - Patented 4 # 6 x 1/2" long Stainless Steel Hex Head Bolts 4 # 6 Flat Washer 4 # 6 Nyloc Nut 2 Custom Stainless Steel 90 degree studded Element Clamp If you run more than 500 watts PEP and need a high power 9:1 unun for your end fed antenna, check out the CU-9-1500 (1500 watts PEP) or CU-9-5000 (5000 watts PEP) Installation For best results raise the Bullet matching unit as high as possible (use a tree or vertical support) and then extend the antenna wire horizontally or as an “L Sep 3, 2020 · Balun One Nine v1 - Tiny Low-Cost 1:9 HF Antenna Balun and Unun with Antenna Input Protection for Ham It Up, RTL-SDR, HackRF and Other HF-Capable Radios. Check out TheSmokinApe Merch Shop: https://shop. Oct 27, 2022 · $\begingroup$ R Pau is correct, Simon Hefford. It is a great antenna and works This video discusses End Fed antennas and particularly End Fed Random Wire antennas for ham radio. Key Features/Specifications: Type: 9:1 Unun ; Frequency: 1-50MHz; Power: 500 Watts ; Impedance: 50 Ohms; Connection: SO239 for cable 2 x brass terminals for wire Nov 20, 2020 · Looking for some advice. but consider that your, description of the antenna is not correct for most bands you list, and the one it is a halfwave for, 40M (7. It will easily handle 10 watts. Typically a Apr 14, 2002 · On 80 meters, the 9:1 unun shows about a 3:1 SWR, on 40 meters, it's right at 2:1 SWR, and it flattens out at 20 meters and stays under 2:1 SWR through most of 10 meters. Uncoil the magnet wire. 8-54 MHz, Two SO-239s, Incl It utilizes a 9:1 UNUN transformer in order to bring the impedance of the antenna to more manageable values for your antenna tuner. 9:1 VOLTAGE UNUN. And I’m going to keep this VERY simple because there are scores of books Jun 7, 2022 · K4SWL Antenna Plus. Great for DIY Dipole and Longwire Antennas 4. 9:1 voltage unun using a T-200-2 powdered iron toroid core. Unun 9:1. I used the 9135 9:1 Unun with a 135' wire. - lightweight (only 50g) - small dimensions (fits into your pocket) This compact wire antenna is ideal for SOTA activations, camping, backpacking, and travel. Using this unun will allow transceivers with internal antenna tuners to work most if not all HF bands. 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. You can add your own wire or get the complete product from this link EFLW-3K antennas. 5 98. One end is 25' up in a tree (isolated from the tree limb itself by an egg insulator and 4' of rope, of course) and the other end is atop a 10' pvc mast where it connects to a 9:1 unun transformer (the one sold by EARCHI). The 200 watt Unun also operates “stand alone”, thus does not require an LDG Tuner for resonant verticals. Aug 12, 2016 · A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. 5KW PEP) or the CU-9-5000 (5KW PEP) ununs on the 9:1 impedance transformer page in our website at Palomar-Engineers. Jan 24, 2024 · They are designed specifically for unbalanced lines. 5 foot long, in an inverted L configuration. I recently purchased the Nelson 9:1 unun and am VERY SATISFIED! Time Owned: 0 to 3 months. The three parallel red lines indicate the range that it was hoped that most amateur bands would fall into. * Frequency coverage: 1. com You can also purchase antenna wire and higher power noise filters and Can you model the antenna with a 9:1 Unun at the base, thats then fed with the antenna tuner at the end of the feedline? I have been using various verticals like this with a 9:1 UNUN. 5 x 5 x 1. So, if you connect a length of wire that presents an impedance of about 450 Ω to the input, you’ll get an impedance of about 50 Ω on the output. And you can feed it with coax from your shack. 3:1 from 3. If you need a higher power 9:1 unun for your end fed antenna, check out the Bullet-9U-500, SBullet-9U-1500, or the CU-9-5000 (5KW PEP) Installation. com End Fed 40-6M with 9:1 UnUn; Reviews: 14 MSRP: 47. SWR will vary based on This Mini 9:1 UnUn can be used also as the base point of a vertical antenna with its random length (minimum lenght should be at least 6m). The wire is 84. The benefit is that the radiating element is away from the shack and less likely to cause EMC problems. – 9:1(450Ω to 50Ω) UNUN. They have worked well but relative to something else I dont really know how good they really are. 1MHz), you should be using a much higher ratio transformer for, like 49/64:1; you are in the ballpark and you just need to do a little impedance and reactance tuning with a tuner. UNUN, 9:1 Ratio, 200W PEP End Fed Long Wire, Each. Start with the end of the wire in the center of the toroid and begin winding as shown in the image to the right. 25 in. The matching transformer is a 9:1 UnUn which is trifilar wound on a larger toroid. My target antenna is one I learned from Thomas, K4SWL. 5 - 54 MHz. 5 124. wfbrwx wzpfpd bidxg ebyhy sbbi mpuo hcllg xwvae kftatk lnnz
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