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Recommended Wire Lengths And Installation Notes For Unun

Dxsupply.com   DA: 12 PA: 50 MOZ Rank: 62

Recommended wire lengths and Installation Notes for Unun models 4932, 4935, 9130, 9132 & 9135 Table shows typical SWR relative to installed wire length.

Wire Lengths For 4 And 9-1 Ununs

Balundesigns.com   DA: 20 PA: 50 MOZ Rank: 71

  • Installing a 1:1 choke balun at or near the unun will not allow the coax shield of the feed line to be used 9:1 ratio is also required
  • Length of counterpoise should be a minimum of 30-40 feet but not the same length of the antenna wire
  • Shorter length counterpoise wires can be used if operation is confined to 40m or higher

Playing With End-fed Wire Antennas And 9:1 Ununs

Kb6nu.com   DA: 13 PA: 40 MOZ Rank: 55

  • A 9:1 unun is a transformer that reduces the impedance at the input by a factor of 9
  • 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
  • In fact, the 9:1 unun that I built is actually an autotransformer
  • Here’s a video that talks a little bit

The W1SFR End Fed 35’ Random Wire Antenna With 9:1 UnUn

Kx3helper.files.wordpress.com   DA: 29 PA: 38 MOZ Rank: 70

  • 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
  • And I’m going to keep this VERY simple because there are scores of books

End-fed Multiband Antenna

Webclass.org   DA: 16 PA: 50 MOZ Rank: 70

  • QRP 9:1 Unun 1.5 - 54 MHz 300 watts #9130sw - Wing nuts Balun Designs - (changing overall length of the wire) for best coverage of all HF bands
  • Short antenna lengths will never be capable of performing as a highly efficient antenna
  • The intent of this unun is to allow full HF coverage for portable applications or in restricted

Homebrew 9:1 Unun For Random Length Wire Antennas

Worldwidedx.com   DA: 19 PA: 50 MOZ Rank: 74

  • 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
  • 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

End Fed 9:1 Magic Wire Lengths Ve3ips

Ve3ips.wordpress.com   DA: 20 PA: 42 MOZ Rank: 68

  • Remember, the 9:1 balun is doing a conversion of impedance from about 450-700 ohms down to 50 ohms
  • The antenna cannot be an actual 1/4 wave length on any ham band
  • Thus 8, 16, 32, 68 lengths are ruled out
  • For example a 32 foot length is actually a half wave on 20m with an impedance of about 3500 ohms and requires a 50:1 balun.

G0KYA's Amateur Radio Blog: Long Wire And Un-Un Part 2

G0kya.blogspot.com   DA: 18 PA: 40 MOZ Rank: 65

  • If you want to build your own follow these instructions: Building a 9:1 unun
  • Note: you could also use a T130-2 toroid, but that will be limited to a maximum of about 75-100W
  • To understand how to construct an unun lets build a 9:1 version
  • You will need a T-200 (red) toroid and three pieces of wire, each 24 inches (60cm) long .

Random Wire Antenna Lengths

Udel.edu   DA: 8 PA: 20 MOZ Rank: 36

  • (QST, Oct 1926, "The Length of the Hertz Antenna" shows in line 2 of the table that a similarly installed random wire should use 423/f
  • W3EDP's results in the above referenced 1936 article, however, fall in line with 468/f and so is used here
  • Change the program to use 423 if desired.) In addition to multiples, wire lengths less than 1/4

LDG Electronics RU-9-1 LDG Electronics RU-9:1 Unun DX

Dxengineering.com   DA: 21 PA: 17 MOZ Rank: 47

  • 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
  • This 200 watt Unun also operates "stand alone" meaning that it does not necessarily require a tuner for use on certain antenna.

Optimum Length Of Inverted L W/9:1 UNUN

Reddit.com   DA: 14 PA: 50 MOZ Rank: 74

  • Does anybody have any experience with an inverted L antenna fed with a 9:1 unun via coax? I've tried several different lengths, and just re-strung it with 53 feet yesterday.
  • one of the recommend lengths for 80-10m
  • However, the SWR seems to have increased over the …

The End Fed Half Wave Antenna

Gnarc.org   DA: 13 PA: 50 MOZ Rank: 74

  • Application of 9:1 UNUN Emergency Amateur Radio Club of Hawaii (EARCHI) marketed a matchbox-kit for a 6-40 mtr multi-band end-fed antenna
  • Uses non-resonant antenna (Recommended antenna wire length: 24-30 ft (60 ft max) and powdered iron toroid, efficient transmission line transformer 7

Length Of Counterpoise With An End Fed Wire + 9:1 Unun

Reddit.com   DA: 14 PA: 50 MOZ Rank: 76

  • I've just built an end-fed wire antenna and am using a 9:1 unun to feed it
  • I'm quite impressed with it so far
  • It's a decent match on everything from 40m to 10m, but i was wondering about the effect of the length if the counterpoise.

Random Wire Antennas Using The LDG 9:1 UnUn

Simplehamradioantennas.com   DA: 30 PA: 50 MOZ Rank: 93

  • An informative, easy-to-understand discussion of Random Length Wire Antennas from Peter of UK's Waters & Stanton Ham Radio Store
  • Random wire antennas are good antennas if you use a 9:1 UnUn to match the high antenna impedance of the wire to the low impedance of your transceiver.

Amateur Radio

Qsl.net   DA: 11 PA: 19 MOZ Rank: 44

  • SHORT 9:1 UNUN FIELD VERTICAL This "Short 9:1 Unun Field Vertical" is a quickly depoyable, light-weight and significantly more easily transported version of the 31' Unun Antenna shown elsewhere on this page
  • Using a 16-17' wire radiator suspended by one of the ~$10 Chinese fishing poles from eBay, a waterproof plastic box (also available from eBay, et

End Fed Wire With 9:1 Unun

Forums.qrz.com   DA: 14 PA: 10 MOZ Rank: 39

  • I can’t speak for the 9:1 UNUN on a “random” wire end fed antennas without counterpoise
  • However, the UDEL 1/2 Wave Lamda Chart is my wire length resource for remote tuned Inv-L with radials
  • I typically choke the coax as close as possible to ATU to avoid using it as counterpoise

9:1 Or 49:1 For End-fed Long/random Wire QRZ Forums

Forums.qrz.com   DA: 14 PA: 10 MOZ Rank: 40

  • The question is:which unun would be more ideal?a 49 to 1,or a 9 to 1?The goal would be to have a not efficient but usable antenna 80m to 10m,until I can put up other and better antennas for the lower and higher bands
  • Sorry for this short "novel" I wrote,I hope everything is understandable Thanks in advance,73!

Portable Antennas: The EARCHI End Fed

Nt1k.com   DA: 8 PA: 38 MOZ Rank: 63

  • In the search for the “Wonder Antenna” that is small, portable and easy to setup, I’ve decided to build an Endfed antenna using a 9:1 match
  • This antenna has been made popular by the Emergency Amateur Radio Club of Hawaii (EARCHI)
  • It consists of 30ft of wire fed into a 9:1 UnUn (Unbalanced to Unbalanced).

80-10 End-fed Half-wave Antenna With 49:1 Unun

Noji.com   DA: 8 PA: 50 MOZ Rank: 76

  • An 80-10 end-fed half-wave antenna can be a very good performing part of an HF station
  • But its performance depends heavily on a well-designed and carefully constructed 49:1 unun, which matches the long wire impedance to within tuning range of operation
  • But the perfor-mance of an end-fed antenna is also very dependent on height above ground.

9:1 Magnetic Longwire Balun / Unun – M0UKD – Amateur Radio

M0ukd.com   DA: 9 PA: 50 MOZ Rank: 78

  • These are sometimes known as a Magnetic Longwire Balun
  • 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 …

End Fed Half Wave MultiBand Antennas

Hamfest.w7yrc.org   DA: 17 PA: 42 MOZ Rank: 79

Antenna? Transformer is a 1:49 or 1:64 UnUn (not 1:4 or 1:9 used on random wire antennas) 50 Ohm Coax from transformer to station Multi-Band (works on all harmonics) Deploy it horizontal, sloping, inverted-L, inverted-V Commercial example: MyAntennas EFHW-8010-2K Pass it …

WV0H Myron: Loss In A Deployed End Fed Wire And 9:1 Unun

Wv0h.blogspot.com   DA: 17 PA: 50 MOZ Rank: 88

  • 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
  • There are many lengths of wires used with a 9:1 unun but most fall in between 30 to 40 feet.

Unun 9:1 Ferrite

Vk6ysf.com   DA: 14 PA: 16 MOZ Rank: 52

  • 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.
  • Requiring a unun to feed a long wire antenna ideally without a tuner a 9:1 voltage unun design using a L15 ferrite toroid core …

33ft Verticals And 4:1 Ununs

G8jnj.net   DA: 9 PA: 35 MOZ Rank: 67

  • conjunction with 33ft vertical antennas
  • I referred to measurements I had previously made with 10m vertical antennas fed with 4:1 Ununs
  • Most of this work was done as part of an investigation into the performance of the Comet CHA-250 broadband antenna, which uses a deliberately lossy 6:1 Unun to provide a good match on all bands.

End Fed Antennas

Palomar-engineers.com   DA: 21 PA: 49 MOZ Rank: 94

  • For non-resonant end fed antennas, the typical feed point impedance is 300 to 600 ohms and a 9:1 impedance transformer (e.g
  • 450 ohm average antenna impedance to 50 ohm coax, also know as a 9:1 unun)
  • For do-it-yourself antenna builders, …

Make A 80 Metre End Fed Antenna

Qsoshack.com   DA: 16 PA: 26 MOZ Rank: 67

  • The antenna is fed by low loss coax into a 9:1 UnUn
  • One terminal of the UnUn is connected to a good ground and the other to the antenna wire
  • The UnUn is located away from the house
  • Low loss coax is used due to the distance between the radio and the UnUn
  • I used a length of copper water pipe as the earth spike.

Long Wire Antenna Random Wire

W8ji.com   DA: 12 PA: 22 MOZ Rank: 60

  • A current balun isolates the ground path from the counterpoise to the shack
  • The balun must be a high quality current balun, not an unun or voltage balun
  • It should be a 1:1 ratio with high common mode impedance and high voltage breakdown
  • The coaxial feed line, since it operates at high SWR, should be high quality and as short as possible.


Om0et.com   DA: 13 PA: 19 MOZ Rank: 59

  • This type of antenna needs at least 20m long counterpoise or good grounding for it's effective work
  • For it's simplicity and small dimensions is very popular for portable or SOTA activities, and also as the base antenna
  • 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

Building An End Fed Antenna

Ogdenarc.org   DA: 16 PA: 50 MOZ Rank: 94

  • How to Feed an End Fed Wire? The Balun or in this case the Unun The end fed wire regardless of its length presents a high impedance to the feedline
  • If the intention is to 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.

Real World Measurements Of A Multi-Band End Fed Antenna

Amateurradio.com   DA: 20 PA: 50 MOZ Rank: 99

My antenna wire is 35 feet long and 30 feet above the ground and its orientation is horizontal, (perpendicular to the ground!) Building the 9:1 UnUn was fun and I was eager to have a multi-band antenna! This antenna got a lot of …

Random / Long Wire Antenna

Sites.google.com   DA: 16 PA: 22 MOZ Rank: 68

  • 9:1 unun and RF current choke: 9:1 unun - an attempt to impedance match random / long wire antenna - transforming 50 ohm impedance to 450 ohms
  • For more info on ununs, search the web for: 9:1 unun or 1:9 unun
  • RF current choke - to reduce or eliminate feedline radiation due to common mode current flow.

Random Wire Antennas

Hamuniverse.com   DA: 19 PA: 30 MOZ Rank: 80

The random wire antenna is probably one of the least expensive, easiest and cheapest HF antennas to use if you have a tuner and you want to get the "most" out of a length of "random" wire without having to pull out that calculator, doing the math, getting the center insulator built or bought, running the feedline, and all the rest that goes

UnUn Experiments

Karinya.net   DA: 15 PA: 12 MOZ Rank: 59

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

RANDOM WIRE ANTENNA With 9:1 UnUn Home Made (part 1)

Youtube.com   DA: 15 PA: 6 MOZ Rank: 54

I made the HF multiband Random Long Wire Antenna with UNUN 9:1 (my toroid T130-26 from an old PC PSU) publicated by VK6YSF on his website here:https://vk6ysf

END FED 6–40 Meter Multiband HF Antenna

Earchi.org   DA: 10 PA: 32 MOZ Rank: 76

  • This project creates a trifilar wound, 9:1 UNUN (unbalance to unbalance) toroid matching transformer that will match the high input impedance of an end fed antenna into the range where most antenna tuners can produce good performance
  • The matchbox handles 100 watts of power
  • This project requires an antenna tuner to achieve satisfactory SWR.

Bullet 50:450 (9:1) HF Unun, 1.8-61 MHz, 1500 Watts, End

Palomar-engineers.com   DA: 21 PA: 50 MOZ Rank: 15

  • Bullet 50:450 (9:1) HF Unun, 1.8-61 MHz, 1500 Watts, End Fed Antennas
  • a length from the table above as these lengths will form a non-resonant antenna for the amateur bands indicated.The antenna length should NOT be ¼, ½ wavelength on any frequency that you transmit as the

DIY 49:1 Unun Impedance Transformer For End-Fed Half Wave

Km1ndy.com   DA: 10 PA: 50 MOZ Rank: 96

  • The following is a list of materials required to make a 49:1 unun impedance transformer for an end-fed half wave antenna
  • You will also need a half-wavelength length of wire (14 or 12 gauge typically) in order to construct an …

Amateur Radio (G3TXQ SK) – UnUn Experiments Ve3ips

Ve3ips.wordpress.com   DA: 20 PA: 50 MOZ Rank: 13

  • 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.

29/35 Foot End Fed Wire

Huyettm.net   DA: 15 PA: 28 MOZ Rank: 81

  • This simple antenna consists of a 35 ft piece of small gauge wire as the radiator, a 35 ft counterpoise, a 9:1 UNUN and a BNC jack to connect the feed line
  • For a feed line I use RG174 coax
  • I assembled everything onto a Sotabeams wire winder including the counterpoise, so the whole thing is a self contained, easy to deploy portable antenna.

End Fed Half Wave Antennas – Elgin Amateur Radio Society

Elginradio.wordpress.com   DA: 24 PA: 39 MOZ Rank: 11

  • The one that Steve promotes is to use a 49:1 unun and information about this method follows
  • The following is a diagram which explains how to construct a 49:1 transformer
  • Wound with #14 enameled wire using FT240-43 toroids: Steve made a video in which he showed the results of antenna tests using various setups.

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