Home : Antennas : Baluns
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    • Baluns: theory and projects
      All about baluns with photos, projects and instructions, by IZ7ATH
    • HF Home made Balun
      A balun is a device that is used at the feedpoint of a balanced antenna when an unbalanced feedline is desired to feed the antenna. Balun is a contraction for BALanced to UNbalanced.
    • Balun Theory
      The word balun means balanced-unbalanced: it's used to adapt a balanced device to an unbalanced one, read more basic thory on Ununs and Baluns
    • Balun for HF wire antennas
      Schema of a self made balun used to match randmon wire antennas, mainly for shortwave listening pourposes, in italian
    • Building baluns
      How to easily home-brew baluns even in strange formats 1/1 - 2/1 - 4/1 - 6/1 - 9/1 - 12/1 et 16/1 for bands from 1.8 to 30 (50) MHz in french
    • The 9:1 balun
      Homemade 9:1 antenna balun simple project
    • Coaxial Balun
      Coaxial balun plan by I0QM
    • Magnetic Longwire Baluns
      Do these things do exactly what they say they do, or are they total hogwash? - Patrick lifts the lid on the MLB
    • Balun construction
      PDF files describing how to homebrew a 1:2.5 balun
    • IZ7ATH Projects
      Antennas, Keyer, amplifier, transverter, baluns
    • A better antenna-tuner balun
      Which balun to use? The hybrid balun promises advantages over both voltage and current baluns by ZS1AN
    • Feeding an End-Fed Antenna
      End-Fed antennas are NOT balanced systems; but neither are verticals, ground planes, discones, windoms, zepps, Marconis, half-slopers, et al. Additionally, the low-impedance antenna port of your transmitter/receiver is not balanced.
    • OH7SV Matti Hohtola Ham Projects
      The most modern QRP transceiver in 2004,Direct Conversion HF Transceiver with DDS LO, 50 ohm to 200 ohm HF wide band transformers, Wilkinson splitter for RX measurements, Windom baluns 2001/2004, Ferrite rod antenna for 80 meter, Magnetic Loop Antenna for 80 m, Mascot Switched PSU 9320 modification to 8A peak current, 150W MOSFET linear amplifier for 80m, 80 m HF SSB/CW Transceiver
    • Longwire Antenna Balun Project
      Home brew a long wire balun
    • Simple HF Baluns for 50/75 ohm coax
      Show diagrams, winding methods and tables of some 1:1 and 4:1 baluns for 1.8 - 30 MHz suitable for use up to 200W (400W peak) on systems using 50 or 75 ohm coaxial cable input where SWR should not exceed 1.6:1.
    • Antenna Baluns: What they are
      Baluns what do they do, in a pdf file by W7EL
    • Winding style of toroid chokes and baluns
      Dispels myth about choke balun winding method
    • A 9:1 Balun
      How to DIY a 9:1 balun in french
    • 1:2.5 Balun for multiband Deltaloop - A complete documentation with pictures and design of a deltaloop antenna and 1:2.5 balun
      [ Hits: 3580 | Votes: 14 | Rating: 7 ]
    • 1:49 Transformer - This 1:49 transformer is used with wires any multiple of 1/2 wavelength. This is not a matching network, it's a wideband transformer and it has some advantages compared to LC matching
      [ Hits: 1732 | Votes: 12 | Rating: 5.91 ]
    • 600:50 Ohm Baluns - Low-cost 600:50 Ohm Baluns by Andrew Corney ZL2BBJ
      [ Hits: 3853 | Votes: 4 | Rating: 5.75 ]
    • 9:1 Magnetic Longwire Unun - A magnetic longwire unun with a T130-2 Iron Powder core by M0UKD
      [ Hits: 1227 | Votes: 5 | Rating: 7.6 ]
    • A 9:1 Balun - How to DIY a 9:1 balun in french
      [ Hits: 7343 | Votes: 13 | Rating: 6 ]
    • A balun tutorial design - A balun tutorial discussing a number of aspects of the design and construction of baluns for the amateur radio design of your next electronic project.
      [ Hits: 4519 | Votes: 4 | Rating: 7.25 ]
    • A better antenna-tuner balun - Which balun to use? The hybrid balun promises advantages over both voltage and current baluns by ZS1AN
      [ Hits: 22327 | Votes: 11 | Rating: 5.83 ]
    • A Mini-Balun BLT - A mini balun 1:1 4:1 project by WV0H
      [ Hits: 863 | Votes: 0 | Rating: 0 ]
    • A Short Course On Baluns - An interesting article on basics about Baluns, intoducing the skin effects on radio frequency currents and its effects on receiving and trasmitting article by VE7FO
      [ Hits: 147 | Votes: 0 | Rating: 0 ]
    • About Baluns - General article on Baluns at myantennas.com, what is a balun and when to use baluns
      [ Hits: 861 | Votes: 2 | Rating: 10 ]
    • Antenna Balun - What is an antenna balun, why and when do you need it, type of transformers, impact on SWR and feed line efficiency.
      [ Hits: 974 | Votes: 1 | Rating: 8 ]
    • Antenna Baluns: What they are - Baluns what do they do, in a pdf file by W7EL
      [ Hits: 11833 | Votes: 4 | Rating: 5 ]
    • Antenna Theory : Baluns - This article describe the principles of baluns when referred to devices used to balance unbalanced systems, like a coax cable and a dipole antenna
      [ Hits: 521 | Votes: 1 | Rating: 8 ]
    • Balun and Transformer Core Selection - Occasionally errors are made regarding core selection. This especially includes baluns, where on occasion some very strange ideas surface.
      [ Hits: 3678 | Votes: 3 | Rating: 6 ]
    • Balun Construction - The design of Ruthroff broadband voltage transformers
      [ Hits: 1572 | Votes: 6 | Rating: 7.17 ]
    • Balun construction  pop - PDF files describing how to homebrew a 1:2.5 balun
      [ Hits: 26538 | Votes: 37 | Rating: 6.57 ]
    • Balun construction - problems with iron cores - Lots of information and measurements relating to HF baluns and transformers constructed using Iron Powder cores
      [ Hits: 2176 | Votes: 2 | Rating: 6 ]
    • Balun designs - An introduction to Baluns, what they do and how to design efficinent baluns
      [ Hits: 586 | Votes: 0 | Rating: 0 ]
    • Balun for HF wire antennas  pop - Schema of a self made balun used to match randmon wire antennas, mainly for shortwave listening pourposes, in italian
      [ Hits: 35436 | Votes: 22 | Rating: 5.55 ]
    • Balun Information - Baluns for HF application resource page
      [ Hits: 3839 | Votes: 1 | Rating: 10 ]
    • Balun measuements - Why can't you find the specifications for the baluns on the market? The only specifications you'll see are the ratio, the power rating and a bandwidth that is more hoped for than reality.
      [ Hits: 2527 | Votes: 3 | Rating: 4 ]
    • Balun Test - How test a Balun quality by W8JI
      [ Hits: 1470 | Votes: 0 | Rating: 0 ]
    • Balun Theory  pop - The word balun means balanced-unbalanced: it's used to adapt a balanced device to an unbalanced one, read more basic thory on Ununs and Baluns
      [ Hits: 37575 | Votes: 30 | Rating: 6.64 ]
    • Baluns - A complete guide to Baluns and transformers by WK5AJL
      [ Hits: 1177 | Votes: 5 | Rating: 5.8 ]
    • Baluns and acceptable power - Baluns / Ununs design and acceptable power
      [ Hits: 1510 | Votes: 104 | Rating: 4.44 ]
    • Baluns by Dan N5AR - There is considerable confusion about the various types of baluns, this article try to make it clear.
      [ Hits: 2160 | Votes: 0 | Rating: 0 ]
    • Baluns in antenna systems - Understanding Baluns. This article explores some simple antenna system configurations and the effect of key system components, connections and dimensions on feed line common mode current.
      [ Hits: 982 | Votes: 2 | Rating: 2.5 ]
    • Baluns in theory - A complete reference on building baluns
      [ Hits: 3424 | Votes: 2 | Rating: 10 ]
    • Baluns on Log Periodic Antennas - Some antenna manufacturers place baluns at the incorrect location in LPDA arrays, or tell you to route the cable incorrectly. This can cause substantial RFI and all sorts of weird problems like RF into house wiring.
      [ Hits: 2351 | Votes: 4 | Rating: 3.5 ]
    • Baluns on Log Perodic Antennas - Some antenna manufacturers place baluns at the incorrect location in LPDA arrays. If we consider what the balun does we can see how the mistake occurs.
      [ Hits: 1518 | Votes: 2 | Rating: 8.5 ]
    • Baluns: theory and projects  pop - All about baluns with photos, projects and instructions, by IZ7ATH
      [ Hits: 53313 | Votes: 46 | Rating: 6.23 ]
    • Baluns: What they do and how they do it - Article on Baluns and how they works, what Problems are Baluns supposed to Solve, Causes of System Imbalance from ARRL Antenna Compendium by W7EL
      [ Hits: 1391 | Votes: 3 | Rating: 6.7 ]
    • Basic Balun Theory - Baluns are still a mystery to some radio amateurs and the only way to understand them is to learn what they are and how to use them.
      [ Hits: 993 | Votes: 2 | Rating: 6.5 ]
    • Broadband Baluns - Voltage baluns and choke (or current) baluns.
      [ Hits: 985 | Votes: 1 | Rating: 9 ]
    • Build your own HF balun - EA4EOZ home made baluns
      [ Hits: 1497 | Votes: 2 | Rating: 6 ]
    • Build your own HF balun - A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cables. Many hams connect the center conductor of the coaxial cable to one side of the dipole, and the shield to the other. Wrong!
      [ Hits: 1399 | Votes: 2 | Rating: 9.5 ]
    • Building baluns  updated  pop - How to easily home-brew baluns even in strange formats 1/1 - 2/1 - 4/1 - 6/1 - 9/1 - 12/1 et 16/1 for bands from 1.8 to 30 (50) MHz in french
      [ Hits: 33124 | Votes: 34 | Rating: 5.67 ]
    • Choke balun - Essentially, a choke balun is designed to 'divorce' your antenna from the feed line. if your feed line is coaxial cable then you don't want it to be part of your antenna. you want to be able to deliver all your power to the radiator itself, i.e. 'the antenna'. a choke balun does this admirably
      [ Hits: 384 | Votes: 11 | Rating: 7.27 ]
    • Coaxial Balun  pop - Coaxial balun plan by I0QM
      [ Hits: 30361 | Votes: 11 | Rating: 5.46 ]
    • Common Mode Currents on Coax - These baluns are used to attenuate the common mode current that flows on the outside of the coaxial feed line.
      [ Hits: 90 | Votes: 0 | Rating: 0 ]
    • Design & Performance of a Choke Balun - Design & Performance of a Choke Balun and Balanced Transmission Line by G4FGQ
      [ Hits: 1168 | Votes: 3 | Rating: 4.33 ]
    • DIY isolation transformers - Article about isolation transformer construction to perform optimal impedance matching. Winding the FCP isolation transformer, includes interesting table for Winding Turns and Lengths and Core Configurations for T300 T200 T400 toroids
      [ Hits: 150 | Votes: 0 | Rating: 0 ]
    • Errante's virtual ground balun - Errante's virtual ground Balun, a state-of-the-art high power HF balun family.
      [ Hits: 771 | Votes: 6 | Rating: 8.83 ]
    • Feeding an End-Fed Antenna - End-Fed antennas are NOT balanced systems; but neither are verticals, ground planes, discones, windoms, zepps, Marconis, half-slopers, et al. Additionally, the low-impedance antenna port of your transmitter/receiver is not balanced.
      [ Hits: 20501 | Votes: 20 | Rating: 7.76 ]
    • HF Home made Balun  pop - A balun is a device that is used at the feedpoint of a balanced antenna when an unbalanced feedline is desired to feed the antenna. Balun is a contraction for BALanced to UNbalanced.
      [ Hits: 38614 | Votes: 26 | Rating: 5.59 ]
    • High impedance baluns - Introduction with some background on balun types
      [ Hits: 807 | Votes: 0 | Rating: 0 ]
    • HomeBrew 1:1 4:1 9:1 Baluns - Circuit diagrams to homebrew different baluns by vk2awx
      [ Hits: 1973 | Votes: 8 | Rating: 3 ]
    • Homebrew Balun Case - Balun case construction, tipically to host toroid cores. Size of case depends on power to handle. By DL5DBM
      [ Hits: 1133 | Votes: 1 | Rating: 10 ]
    • Homemade HF Antenna Balun - AA5TB homemade balun article
      [ Hits: 1700 | Votes: 1 | Rating: 10 ]
    • How build a 1:40 Balun - Italian page about a home made a 1 to 40 balun with pictures and measurements on HF bands.
      [ Hits: 1102 | Votes: 1 | Rating: 8 ]
    • How to Make a Great 9:1 RX Transformer - There are lots of good designs for matching transformers for receiving antennas. Make it yourself it's cheap and easy, and very high performance. This is the design used in the TRX-9 transformers.
      [ Hits: 3010 | Votes: 0 | Rating: 0 ]
    • Inside view of a Magnetic Loop Balun - Inside view of the RF Systems magnetic longwire Bbalun
      [ Hits: 689 | Votes: 0 | Rating: 0 ]
    • IZ7ATH Projects - Antennas, Keyer, amplifier, transverter, baluns
      [ Hits: 23317 | Votes: 25 | Rating: 6.17 ]
    • LA6PB's split dipole - A new method of feeding a dipole with toroids.
      [ Hits: 3826 | Votes: 4 | Rating: 9.25 ]
    • Les baluns - About different baluns types. Samples and schematics for several ratios baluns in french
      [ Hits: 1459 | Votes: 0 | Rating: 0 ]
    • Longwire Antenna Balun Project - Home brew a long wire balun
      [ Hits: 17392 | Votes: 25 | Rating: 6.85 ]
    • Longwire Balun - A long wire balun by ON6MU
      [ Hits: 1686 | Votes: 3 | Rating: 4 ]
    • Magnetic Long Wire UnUn 9:1 - An impedance transformer (9:1) to feed a high impedance long wire (~450 ohm), down to a 50 ohm unbalanced coaxial input.
      [ Hits: 1751 | Votes: 3 | Rating: 6.33 ]
    • Magnetic longwire balun - Magnetic longwire baluns 1:9 combined with ground, a 1:2 and 1:1 balun connections by ON6MU
      [ Hits: 4253 | Votes: 8 | Rating: 5.13 ]
    • Magnetic Longwire Baluns  updated  pop - Do these things do exactly what they say they do, or are they total hogwash? - Patrick lifts the lid on the MLB
      [ Hits: 29434 | Votes: 21 | Rating: 5.37 ]
    • Magnetic longwire baluns 1:9 - This Magnetic Longwire Balun (MLB) makes it possible to efficiently use a coaxial lead-in cable with all forms of longwires, T-forms or other types of wire antennas, without the need for an antenna tuner.
      [ Hits: 3480 | Votes: 4 | Rating: 6.75 ]
    • Making a good balun - The normal way to make a good balun is to wind a core with a bifilar winding about 8-10 turns, and then connect the coax to one side and the antenna to the other.
      [ Hits: 372 | Votes: 0 | Rating: 0 ]
    • Making a simple current balun - Baluns using ferrite rod and ferrite ring by M0SCG
      [ Hits: 1302 | Votes: 1 | Rating: 10 ]
    • OH7SV Matti Hohtola Ham Projects - The most modern QRP transceiver in 2004,Direct Conversion HF Transceiver with DDS LO, 50 ohm to 200 ohm HF wide band transformers, Wilkinson splitter for RX measurements, Windom baluns 2001/2004, Ferrite rod antenna for 80 meter, Magnetic Loop Antenna for 80 m, Mascot Switched PSU 9320 modification to 8A peak current, 150W MOSFET linear amplifier for 80m, 80 m HF SSB/CW Transceiver
      [ Hits: 19734 | Votes: 32 | Rating: 8.12 ]
    • OH7SV Windom baluns - Windom baluns for kilowatt range made with two ferrite toroidal cores amidon ft-140-61 and another schema with two ferrite rods
      [ Hits: 3591 | Votes: 9 | Rating: 8.11 ]
    • Putting a Balun and a Tuner Together - Two wire transmission line as a three terminal Device , The W2DU and W7EL models of a choke balun, The effectiveness of a balun. Article by Kevin Schmidt, W9CF
      [ Hits: 3840 | Votes: 5 | Rating: 6.2 ]
    • QRO baluns - Construct your own heavy-duty baluns capable of matching your amp's output to various antennas.
      [ Hits: 864 | Votes: 0 | Rating: 0 ]
    • QRP Balun - Pictures and assembling instructions of a simple qrp balun
      [ Hits: 2223 | Votes: 0 | Rating: 0 ]
    • QRP Magnetic longwire balun with VHF-splitter - This Magnetic Longwire Balun (MLB) makes it possible to efficiently use a coaxial lead-in cable with all forms of longwires, T-forms or other types of wire antennas, without the need for an antenna tuner.
      [ Hits: 2963 | Votes: 3 | Rating: 7 ]
    • QRP Magnetic longwire balun with VHF-splitter - This Magnetic Longwire Balun (MLB) makes it possible to efficiently use a coaxial lead-in cable with all forms of longwires, T-forms or other types of wire antennas, without the need for an antenna tuner.
      [ Hits: 664 | Votes: 1 | Rating: 4 ]
    • Random wire Unun - Get all band coverage with a single wire and the icom 703
      [ Hits: 3809 | Votes: 10 | Rating: 8.7 ]
    • RF Balun Transformers - This application note is designed to help the reader understand how balun transformers can be used in today’s RF/Microwave communication applications.
      [ Hits: 1952 | Votes: 1 | Rating: 3 ]
    • RF in shack with vertical and longwire antennas - Why a vertical antenna or longwire antenna might require a balun
      [ Hits: 4611 | Votes: 5 | Rating: 7.6 ]
    • Simple 75 ohm Coax Balun - A simple current balun for the FM broadcast band
      [ Hits: 2195 | Votes: 7 | Rating: 2.86 ]
    • Simple HF Baluns for 50/75 ohm coax  updated - Show diagrams, winding methods and tables of some 1:1 and 4:1 baluns for 1.8 - 30 MHz suitable for use up to 200W (400W peak) on systems using 50 or 75 ohm coaxial cable input where SWR should not exceed 1.6:1.
      [ Hits: 13963 | Votes: 20 | Rating: 3.7 ]
    • Sleeve Baluns - Sleeve baluns are normally used at VHF and higher. As a general rule, they are not practical at HF. The balun can be inverted and used as a skirt to form part of the antenna element
      [ Hits: 916 | Votes: 1 | Rating: 4 ]
    • Some Aspects of the Balun Problem - Why all the mystery surrounding baluns ? To use or not to use baluns
      [ Hits: 778 | Votes: 0 | Rating: 0 ]
    • Switchable Balun - A 1:1 to 4:1 switchable balun by N1LO
      [ Hits: 3105 | Votes: 2 | Rating: 3 ]
    • Switchable MTFT for Wire-Antennas - A switchable Magnetic Transformer for Transmitting for various impedances
      [ Hits: 964 | Votes: 59 | Rating: 7.33 ]
    • TH6 balun replacement project - VE7AVV replace balun on a TH6 antenna
      [ Hits: 1092 | Votes: 1 | Rating: 10 ]
    • The 9:1 balun  pop - Homemade 9:1 antenna balun simple project
      [ Hits: 32321 | Votes: 34 | Rating: 6.47 ]
    • The DC Isolated 1:1 Guanella - The DC Isolated 1:1 Guanella, transmission line transformer by N7ZWY
      [ Hits: 503 | Votes: 0 | Rating: 0 ]
    • The Guanella Balun - An interesting article on guanella baluns that cover several aspects of homebrewing 1:1 and 4:1 current baluns by KN9B
      [ Hits: 689 | Votes: 1 | Rating: 10 ]
    • Transformer for Ground-Independent Receiving Antennas - Transformers theory and calculator of turns on binocular cores. Comparison with toroid cores.
      [ Hits: 1175 | Votes: 1 | Rating: 7 ]
    • Transmitting Baluns - One of the most popular Ham-lore rumors is a balun's performance can be tested or evaluated by grabbing the coax and watching for an SWR change. This is probably one of the worse test-rumors circulating
      [ Hits: 3195 | Votes: 2 | Rating: 9.5 ]
    • Tuner Baluns on Input - There is a common perception that placing a balun on the input of a tuner causes the balun to work better. The thought is the balun operates with a matched impedance and that reduces balun losses. It also is thought that moving the balun improves balance.
      [ Hits: 498 | Votes: 1 | Rating: 1 ]
    • Using Delta Matching on HF Beams - Using delta match with HF antennas design
      [ Hits: 5462 | Votes: 4 | Rating: 3.5 ]
    • WB6ZQZ 3 in 1 Balun - Builing a triple ration balun, that match resonant antennas from 9 ohms to 75 ohms with 1.5:1 or less SWR
      [ Hits: 6269 | Votes: 7 | Rating: 7 ]
    • When and Where to Use Baluns - Baluns are usually used by Hams to feed dipole antennas with 50 ohm coax and to transpose from ladder line feeding a multi-band antenna to the unbalanced input of an antenna tuner.
      [ Hits: 1038 | Votes: 8 | Rating: 7.75 ]
    • When you need a balun - Answer to a common question, Do I have to have a balun in my antenna ?
      [ Hits: 4678 | Votes: 4 | Rating: 5.5 ]
    • Winding style of toroid chokes and baluns - Dispels myth about choke balun winding method
      [ Hits: 9258 | Votes: 14 | Rating: 6.78 ]
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Antennas : Antenna Balun and Unun

Antenna Balun and Unun
Balun Construction. Baluns are devices that are used to balance unbalanced systems, from here the acronym BalUn. In antenna feed lines, the balun is often used to balance a coax cable and a dipole antenna

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