This must be one of the most useful and well presented hobby radio projects on the web. Red wire on left side of unun winding and green wire on right side of winding goes to BNC "hot". Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. Rated at 250w across 1.8-30MHz. no ground for this type of antenna. FT-140-61 1.400 inch 0.900 inch 0.500 inch 61 125 $3.75 FT-140-67 1.400 inch 0.900 inch 0.500 inch 67 40 $6.00 FT-150A-K 1.500 inch 0.750 inch 0.500 inch K 290 $12.95 FT-240-61 2.400 inch 1.400 inch 0.500 inch 61 125 $9.00 Or, do I mount the UNUN close to the earth spike at (nearly) ground level? The main category is Home-made antenna baluns projects that is about Balun Construction. The toroid is a T130-2 Iron Powder core, with 3 x 9 turns of 18SWG enammeled copper wire, and the connections can be seen below. Not only that, it’s appropriate both for qualified TX use and SWL RX. Love the site and its info,,keep up the good work- – … … —, Your email address will not be published. GET A PREASSEMBLED ANTENNA. HOMEBREW A BALUN Many modern HF transceivers come fully equipped with built in tuners. The 200 watt Unun also operates “stand alone”, thus does not require an LDG Tuner for resonant verticals. Multiple accounts belonging to the same member will be deleted without warning. I’ve heard varying comments about ground/vs. When we say a Balun or UNUN is a 4 to 1 device it will work just as well backwards. Per costruire il proprio UN-UN 9:1, seguire queste istruzioni: Avrete bisogno di un Toroide T-200 (rosso) e tre pezzi di filo lunghi circa 60 cm. This last weekend I decided to roll my own 9:1 Unun for use with my Elecraft KX3 and whatever piece of wire I happen to have handy. It has a constant impedance transformation ratio of 64:1 from 3.5MHz to 50MHz. But opting out of some of these cookies may affect your browsing experience. 1:9 UNUN、6回巻きを試す 1:9 UNUN 完成（FT114-43、7回巻き、1.8～30MHz） 1アマ過去問五年分、二巡目 バランに使うトロイダルコア、#43、#61、どっちがいい？【お詫び】10月20日以降のコメントが反映されていません 1:9 UNUN One final note: A very nice feature of the toroids.info calculator is that it not only calculates the impedance for a particular number of windings, but also the length of the wire that you’ll need. What length of coax run between the Unun-to-choke and choke-to-tuner should I consider. Working in the forward direction a 1 to 1 is 50 Generally, a bit of “random” wire presents a high impedance, so the 9:1 transformation makes life easier on whatever antenna matching unit you have. The image shows the dimensions. See how warm it gets?! a ferrite-cored 1:1 Guanella balun at the ladderline/coax interface. Here's my version. Ideally put the tuner next to the UnUn, or better still, use the tuner instead of the UnUn, at the feedpoint of the inverted V! In fact Kirchoff's current law says the 1:1 voltage balun shown above (unreferenced to ground) does just that but it is still a voltage balun. Necessary cookies are absolutely essential for the website to function properly. I would like to use my long-wire on 6M and possibly 2M. I am building a 9:1 UnUn for an end fed antenna. Can I use stranded wire for the windings around the toroid or must it be solid wire? I would use a T200-2 and a few more windings for 200w. Servirà anche una scatola di plastica di piccole dimensioni con una presa SO239 montata ad una estremità e con due galletti o perni di montaggio all'altra. Wires 1 … Hi John, first many thanks for making this article and photos available! Hi, I have just built one of these devices and seem to have a mounting problem for which I have received conflicting advice. Stranded wire should be fine for this type of transformer. My question is regarding frequency limitations. I'm always fascinated by the "magic" 9/1 un-un for longwire antennas, also called "Magnetic Longwire Balun". Any ideas here? Again, with a good ground, no choke will be necessary and the antenna can perform at its best. A 4 to1 balun can also match 50 Ohm to 12 Ohms, and a 9 to 1 can match 50 Ohm to 5 ohms. Learn how your comment data is processed. The antenna will perform better if you can lay out a ground wire; otherwise it will use the coax shield and radio chassis for ground. 9:1 UnUn Feeding a random/long wire or at the base of a multi-band vertical. Discussion in 'Home Brew' started by Moleculo, Jan 26, 2016. In this instance should I care if the un-choked section radiates — (it’s trying to be the ground). Yes, this is designed for the middle to upper part of the HF spectrum, not VHF. + BALUN - UNUN - TOROIDI 1:1 2:1 4:1 5:1 6:1 9:1 16:1 50:1 64:1 Balun UnUn SMA Commerciali Balun ferrite BINOCULARE Multi UNUN Choke Uno STRANO BALUN Balun - Perdite - … Green wire on left side of unun winding goes to bnc ground. This website uses cookies to improve your experience. Blue wire on left side of unun winding is soldered to red wire on right side of winding. This is a unun ( unbalanced to unbalanced ) transmission line transformer designed to match 3200Ω to 50Ω . 1. Keep the coax between the UnUn and tuner as short as possible. An Unun is used to match an unbalanced line to another unbalanced line. So, do I mount the UNUN high and close to the “long wire” and consequently have a long (15ft) earth wire. There are plenty of end fed wire antennas commercially available for around $75, but you can build the core of this antenna for less than $10. *** NOTE: Unfortunately due to … Total: 839 (members: 39, guests: 655, robots: 145), (You must log in or sign up to post here.). Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. You build this device, connect the transceiver and a longwire antenna of almost random wire, and GO!!! Teflon insulation would be best for higher powers, but it’s a bit pricey! Regards, John. 8 turns is shown here, but more turns is preferred. Thicker wire just makes it trickier to make. These cookies do not store any personal information. -I have plenty of 12 gauge magnet wire at home. Geoff Haines, N1GY. But it doesn’t stop there. . Simply follow this. Can I mount this as an inverted V on a single support pole (for portable/field day use) and then somewhere in the coax cable run from the UnUn to my tuner, simply use a 1:1 Current Balun or RF choke?

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