This 200 watt Unun also operates "stand alone" meaning that it does not necessarily require a tuner for use on certain antenna. I have used most coax cable in a length of 13,5 m or 27,5 m after that i use a ugly balun whit a feeder length of 25 Ft on a pvc tube . I want to build a 9:1 UnUn to feed an end-fed wire for HF QRP portable ops. The W1SFR End Fed 35’ Random Wire Antenna with 9:1 UnUn What is a random wire antenna and how does it work? 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 For the 80 meter band, the ideal length is 21.9 metres. 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 For best results, use the longest wire For optimum results, please use the link below Technically, a 9:1 UnUn (Un balanced to Un balanced) is the appropriate tool to use with a single wire. For the box, I choose a grey SWR will vary based on topography, wire orientation and use of ground or counterpoise. For SWL-ing a smaller core can be used along The Bullet uses all stainless steel connectors and a dual core ferrite 9:1 unun for higher power rating then many competitive products. The 9:1 unun is about 1 foot from the ground, goes vertical for about 12 feet up, then slopes the rest of the way at about a 20 degree angle, ending 9/1 (450 Ohm to 50 Ohm) UNUN as “pre-match unit” for use with multiband endfed non resonant longwire antennas. You use a non-resonate length of wire for the driven element, typically 41′, 35.5′, or 29′, and optionally a 1/4 λ wire for I'm quite impressed with it so far. 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 UnUns can be lossy, particularly at low frequencies where the antenna is electrically short, and small cores can easily be overheated at quite modest transmit powers Part 4 is about the 9:1 UnUn, but do yourself a favour, look at every one from the begining.. Balun in the name means balanced (two wires, one in each hole) to unbalanced (coax cable). For best results All of the articles I've read suggest using a T130-2 core. Recommended wire lengths for Unun models 9130, 9132 & 9135 Typical SWR relative to wire lengths. Antenna Wire Lengths The following are the recommended wire lengths in feet to cover 160 – 10 meters. Recommended wire lengths and Installation Notes for Unun models 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length. Ever since playing with the ubiquitous 9:1 unun there came a point in time when I wanted to find out how lossy this antenna system really is when deployed with a seemingly random wire length. Homebrew 9:1 Unun for random length wire antennas Discussion in 'Home Brew' started by Moleculo, Jan 26, 2016. SWR will vary based on topography, antenna wire configuration and use of ground or Any or all problems are in the counterpoise and feed system. A counterpoise is not real needed, normaly but there is 1/9 Unun construction, they need a counterpoise. Those in 1. Manual 1:2 BalUn 600 Watts for Delta-loop & Quad-loop antennas Manual 1:9 UnUn 600 Watts for long-wire antennas Manual Common mode choke Manual 1:49 UnUn for End Fed antenna’s 100 Watt Manual 1:49 UnUn for End It's a decent match on everything from 40m to 10m, but i was wondering about the effect of the length if the counterpoise. A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9. Lengths to avoid are not always the same as ones recommended on VE3EED's page because I use all halfwave multiples, and of course different band combinations yield different results. The Traditional Long-Wire Antenna, as its name implies, is a simple single length of wire of a thickness strong enough to support its own weight, insulated or not, as long and high as the local geography allows. 10 and No. In real life, even with just one random wire, adding a Balun One Nine results in more signal on HF, and if you connect two equal length random wires to both hole, an even … SWR will vary based on topography, wire orientation and use of ground or counterpoise. This 9:1 Unun (450-50 ohms) will easily handle 300 watts and covers 1.5 - 54 MHz. These are sometimes known as a Magnetic Longwire Balun. The wire is simply laid on the ground, pointing away from the direction of the antenna wire. This is the choke and UnUn to go for. This gave good The PEF 160-10 contains a FT-240/61 trifilar wound, 9:1 UNUN wound with silver tinned PTFE insulated wire. 1/2 Wave 2nd Multiple 3rd Multiple 4th Multiple 1.9 246 492 738 984 3.8 123 246 369 492 7.2 65 130 195 260 10.1 46 92 138 184 14.2 33 66 99 132 18.1 26 52 78 104 21.3 22 44 66 88 24.9 19 38 57 76 28.5 16 32 48 64 Long Wire Antenna 1:9 Balun for 3-50 MHz (by F4HWK): Here i present the fabrication steps for a long wire balun having a transformation ratio of 1:9. It may be used with many of your antenna projects where a 4:1 Unun is … 2. Feeder and UnUn The antenna is fed by low loss coax into a 9:1 UnUn. My windings, in this case, are for transmitting, using No. See the figure at right. The LDG Electronics RU-9:1 Unun was designed to allow easy interface of random length vertical and end fed antennas to the LDG line of Automatic Antenna Tuners. HI POWER QRO 9:1 BALUN / UNUN *** TO BUY WITH CONFIDENCE, YOU ARE GETTING PAYPAL PROTECTION ! Feeding the EFHW wire with a 1:50 – 1:60 impedance transformer (unun) instead of an EFHW tuner incorporating a capacitor makes it far less sensitive to the environment stopping the SWR from varying wildly. *** This is Hi-Power QRO 9:1 Balun / Unun. The wire is 32 ft (9.8 m) long for the 80-40m bands. The power handling has also been tested with a 50 W (SSB) of injected power without any pr… Using this unun will allow transceivers with internal antenna tuners to work most if not all HF bands. Building the 9/1 Un-Un My requirements was: 80m to 6m use QRP or max 100W power light and little for portable use I use an Amidon toroid, a T130-6 with 9 turns trifilar using insulated stranded wire. One terminal of the UnUn is connected to a good ground and the other to the antenna wire. Some say a 65' length, some say 124' some 72 The 4:1 unun also exemplifies (more than any other E"rnsformer) the many choices that can be made in its design. Before I cut any more wire, I thought I'd see what others have experienced before. PTFE insulation, 1.85mm outer dia (CPC part number CB10433) wound on single FT240-61 core. The antenna has optimum efficiency at 20m and will be an S unit less in performance at the 40m and 10m ends. These include: 1) Ruthroff's or Guanella's de-signs, 2) wire or coaxial cable transmission lines, 3) coiled or beaded Grounding and RFI aside etc, I have read several articles on 9:1 unun fed multiband wire antennas, and there seems to be a consensus about wire lengths used with such ununs. In addition to multiples, wire lengths less than 1/4 wavelength of the lowest desired frequency are blocked out because an antenna should be at least that long. 9.8:1 10.2:1 10:1 The antenna itself works just as well as any other wire of similar height and length. Construction of the 9:1 balun/unun: I used an old plastic box and a type 75 toroid core. This is the choke and UnUn to go for. (unbalance to unbalance) torrid matching transformer that will match the high input … These are the lengths recommended by Balun Designs for their 9:1 UNUN and I thank them for the information. This is the following video of the Home made Random Wire Antenna with 9:1 UnUn. There is a Magnetic Longwire Balun.It is an impedance 9:1 transformer 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 ohm (unbalanced) coaxial input, hence UnUn. I made a similar version; of the 4:1 Unun consisting of 12 bifilar twisted turns of 18AWG silver plated stranded wire. The UV resistant ABS plastic housing encloses an efficient matching network allowing the antenna to be fed with common 50 ohm coaxial cable on the SO-239 connection. This balun is simulated with LTSpice and measured with a VNA. We sell the Bullet separately so you can add you own wire type and length (see table of suggested lengths below) or you can purchase a complete antenna system including wire and end insulator. The endfed multiband “longwire” antenna is a popular and simple wire antenna that is often used to be QRV rapidly on several different amateur radio frequency bands. It has a switch half way, to reduce the length of the wire to 16 ft (4.9 m). Simple and inexpensive to build the 9:1 end fed long wire antenna is a good antenna for both portable and home use. 14 solid copper wire. I've just built an end-fed wire antenna and am using a 9:1 unun to feed it. If you want to buy one, look at the HyEndFed , they is one of the best on the market! 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