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Unun 9:1 Ferrite

Vk6ysf.com   DA: 14 PA: 16 MOZ Rank: 30

  • 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 was selected.

9:1 Impedance Transformer Get Out Of The Radio Shack And

Vk1nam.wordpress.com   DA: 20 PA: 26 MOZ Rank: 47

  • I have constructed a 9:1 unbalanced to unbalanced (unun) impedance transformer based on a published design by Peter VK6YSF
  • Over the next six months or so my plan is to experiment with an Inverted V end fed antenna for 80 to 17m, I'm not aiming for transmission on 12 and 10m

Amazon.com: AEcreative 10-160 Meter Amateur Ham HF …

Amazon.com   DA: 14 PA: 50 MOZ Rank: 66

  • This was the perfect kit to assemble the 9:1 UnUn described by VK6YSF
  • It had everything I needed, and it was a piece of cake to wind the toroid and get on the air
  • It took about 2 hours start to finish to assemble, and I was making contacts on 40 meters with 5 watts on a 54 foot wire right afterwards.

PG1N's HAM Radio Site

Pg1n.nl   DA: 11 PA: 13 MOZ Rank: 27

9:1 voltage unun using a T-200-2 powdered iron toroid core by VK6YSF 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

End Fed Long Wire W/ UNUN Not Radiating Well QRZ …

Forums.qrz.com   DA: 14 PA: 10 MOZ Rank: 28

  • Your Unun is a 1:3 voltage transformer ,hence 1:9 impedance transformer meaning that the antenna impedance needs to be 50 * 9 = 450 Ohms for a good match
  • Your long wire antenna is likely having a much higher impedance ,for some of the selected operating frequencies hence the transformer ratio (hence impedance ratio) would then need to be (much

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

Kb6nu.com   DA: 13 PA: 40 MOZ Rank: 58

  • 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

Homebrew 9:1 Unun For Random Length Wire Antennas

Worldwidedx.com   DA: 19 PA: 50 MOZ Rank: 75

  • 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
  • This project is really simple and most of it was made using stuff I found in my junk drawer
  • 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.

Home Brew 1:1 4:1 & 9:1 Baluns.

Benjaminhennessy.wordpress.com   DA: 30 PA: 38 MOZ Rank: 75

  • There is a lot information on how to wind the balun but not on how to select the right core
  • I then came across Peter Miles’ VK6YSF website (www.vk6ysf.com) with some information on 1:1, 4:1 & 9:1 baluns
  • More information is available on Peter’s website but the basic designs are below
  • 1:1 Ruthroff voltage Unbalance to Balance.

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

M0ukd.com   DA: 9 PA: 50 MOZ Rank: 67

  • 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 to a 50Ω (unbalanced) coaxial input, hence UnUn.

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

Youtube.com   DA: 15 PA: 6 MOZ Rank: 30

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

Balun Choke HF

Vk6ysf.com   DA: 10 PA: 25 MOZ Rank: 45

  • Figure 2 Winding details of the 1:1 choking balun
  • The construction was simply to wind 14 turns of RG58 coax onto a FT240-43 Ferrite Toroid Core
  • The result of 14 turns achieved an average of 40uH lumped value inductive reactance to common mode RF currents from approximately 1.0MHz to …

Need Some Unun Advice QRZ Forums

Forums.qrz.com   DA: 14 PA: 10 MOZ Rank: 35

  • That schematic you suggested is the exact one that I used to construct the unun
  • The blue wire starts at the so-239 and is soldered at the other end directly to the purple wire that goes back through the windings again and out to the antenna wire.

PG1N's HAM Radio Site

Pg1n.nl   DA: 11 PA: 13 MOZ Rank: 36

Long wire antenna for portable operations by VK6YSF 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 including a tuner or simply with a tuner is one possible solution.

Forum » Antennas, Feed Lines, Baluns And Antenna Tuners

Arrl.org   DA: 12 PA: 23 MOZ Rank: 48

  • (4) 6' BNC-BNC RG58 coax jumper from rig to UNUN I tested the UNUN by putting 470 ohm resistor across the terminals, patch cable to IC-7000; It showed low SWR accross 40m
  • I tossed the 67' radiator out my 2nd story window in a slight inverted V configuration and tested with no counterpoise, 7' counterpoise, and 34' counterpoise.

Homebrew Wire Antennas For Portable Ops With K0PIR

K0pir.us   DA: 12 PA: 41 MOZ Rank: 67

  • Having read a lot (four articles including the one you cited)
  • American authors seem to lean toward 58-59 feet, while VK6YSF does come up with 64, more or less
  • But the one I see most often is 71-72 feet (Balun Designs, Markowski (udel) and VK6YSF
  • That’s what I will try soon, with my 7300 and a 9:1 Unun from Nelson Antennas

Amazon.com: HAM Equipment 1-30Mhz Shortwave Radio Balun

Amazon.com   DA: 14 PA: 50 MOZ Rank: 79

  • LJJDSLYU HAM HF Band1-30Mhz shortwave Radio Balun Unun DIY kit Radio Wire Loop Antenna, NXO-100 Magnetic Balance
  • Google vk6ysf and you will find it
  • The bottom screws on the PL259 were a little tricky to get on, but with small fingers or pliers you can do it
  • Also I found that the varnish on the wire was more difficult to get off with sand

SOTA – End Fed Long Wire Antenna Results Get Out Of The

Vk1nam.wordpress.com   DA: 20 PA: 50 MOZ Rank: 86

  • The sole purpose of an ATU is to transform the impedance of an unknown or known antenna feed point (where the impedance is not 50 ohms) to 50 ohms, suitable for connection to a solid state transceiver antenna socket
  • An ATU doesn’t ‘tune’ an antenna
  • One of my hombrew HF SOTA antenna options is a 27.2 metre end fed long wire antenna, I

Installation Notes For Baluns & Ununs

Balundesigns.com   DA: 20 PA: 50 MOZ Rank: 87

  • Recommended wire lengths and Configuration Notes for Unun models 4932, 4935, 9130, 9132 & 9135 The following tables show the recommended lengths to use for the antenna wire based on the bands you wish to cover
  • These are based on the use of a sloper configuration with the unun

How To Make A 9 To 1 Autotransformer (UnUn)

Youtube.com   DA: 15 PA: 6 MOZ Rank: 39

Get professional PCBs for low prices from www.pcbway.com --~--How to make a 9 to 1 autotransformer (UnUn)In this video we make a 9:1 autotransformer, also ca

A 9:1 Balun For Your End Fed Antenna

Mobileers.com   DA: 17 PA: 50 MOZ Rank: 86

  • Magnetic Long Wire UnUn 9:1 These are usually called a Magnetic Longwire Balun
  • Its really an impedance transformer (9:1) to feed a high impedance long wire (~450 ohm), down to a 50 ohm unbalanced coaxial input
  • I have heard them called an UnUn which seems more appropriate
  • I almost bought one of these for around £30, but then decided to make one.

Calculations Of End-fed Vertical Performance And Questions

Forums.qrz.com   DA: 14 PA: 10 MOZ Rank: 44

  • Steve, I must admit that the whole unun business is very confusing to me
  • Iron powder cores seem to have very low inductance, and a 9:1 Ruthroff balun based on an iron powder core doesn't achieve enough choke impedance to drive a 450 ohm matched load.

The Shortwave Antenna

Hamradiosecrets.com   DA: 23 PA: 23 MOZ Rank: 67

  • The UNUN serves two purposes: Provide a means to transform the very high impedance of an end-fed antenna down to an impedance somewhat closer to the impedance of a 50 ohms or 75 ohms coaxial cable
  • This is desirable to ensure a more efficient transfer of the RF energy (microvolts), captured by the antenna, toward the receiver.

Gutters: They Do More Than Catch The Rain QRZ Forums

Forums.qrz.com   DA: 14 PA: 10 MOZ Rank: 46

  • I don't live in an HOA, but I do have a happy XYL who didn't want wires criss-crossing the yard
  • I spun up a 9:1 unun as outlined

Powdered Iron Core Baluns. QRZ Forums

Forums.qrz.com   DA: 14 PA: 10 MOZ Rank: 47

  • The 9:1 T200-2 Unun above is winded with 3x10 turns
  • The 50 ohm side is connected across 10 turns witch is only 1.2uH on this core
  • If we would agree that we need at least 4xZ0 (200 ohm) for the inductive reactance to be "invisible" at the desired frequency this Unun will be usable from 28 MHz.

4:1 Balun. How To Make One Easily And Cheaply.

Youtube.com   DA: 15 PA: 6 MOZ Rank: 45

  • #GeorgeChristofi #GeorgesWorkbenchI was asked by a friend to get some information on baluns as he needs one for an antenna he is building

Long Wire Antenna For Portable Operations

Dxzone.com   DA: 14 PA: 50 MOZ Rank: 89

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 including a tuner or simply with a tuner is one possible solution with the 9 1 voltage unun and wire lengths suggested in the below tables the antenna should present non extreme

9:1 Voltage Unun

Dxzone.com   DA: 14 PA: 30 MOZ Rank: 70

  • The resource is currently listed in dxzone.com in a single category
  • The main category is Home-made antenna baluns projects that is about Balun Construction
  • Baluns are devices to balance unbalanced systems.
  • This link is listed in our web site directory since Thursday Jul 9 2015, and till today " 9:1 Voltage Unun " has

Clearing Up Some Confusion About End-Fed Wire Antennas

Youtube.com   DA: 15 PA: 6 MOZ Rank: 48

  • Hoping to clear up some confusion on end-fed wires, half-wave or random and the impedance transformers used with them
  • You also get a free rant on contests a

End Fed Antenna Archives

Kb6nu.com   DA: 13 PA: 21 MOZ Rank: 62

  • 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.

Putting Up A "random" Wire Antenna For HF Bands

Eevblog.com   DA: 11 PA: 50 MOZ Rank: 90

  • Re: Putting up a "random" wire antenna for HF bands
  • FWIW, my experience has been that 73 material is "better" than 43 material for HF transformers and baluns
  • Another turn or two (above what's specified for 43 material) could be necessary though
  • The 43 material might be "better" for 160-meters, AM-BCB, etc

Unun Archives

Kb6nu.com   DA: 13 PA: 10 MOZ Rank: 53

  • 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.

Jaycar L15 Toroid

Eevblog.com   DA: 15 PA: 38 MOZ Rank: 84

  • « Reply #3 on: October 26, 2020, 10:49:12 am »
  • L15's datasheet states 0.1-2 MHz "practical frequency" and a µ of 1000
  • Resonant frequency for Amidon #77 is 1 kHz - 2 MHz and µ is 2000

Balun Guanella Current 1:4 Ham Radio, Ham Radio Antenna

Pinterest.com   DA: 17 PA: 24 MOZ Rank: 73

  • 9:1 Magnetic Longwire Balun / Unun – M0UKD – Amateur Radio Blog 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 to a 50Ω (unbalanced) coaxial input

Amazon.com: Customer Reviews: HAM Equipment 1-30Mhz

Amazon.com   DA: 14 PA: 50 MOZ Rank: 97

  • However, after building this balun (unun really) in a 9:1 configuration I can state that it does very very good at reception
  • Ive seen a 20db gain over a whip antenna on the Pl-880
  • On HF you can hear a few hundred miles if not better
  • This unun is being fed with a 97' 1/16th" steel cable in a horizontal U configuration (Rx only).

Magnetic Baluns

Theradioboard.com   DA: 17 PA: 17 MOZ Rank: 68

  • by Garry » Fri Jun 26, 2015 12:10 pm
  • I've been puzzled by the spread of these long wire magnetic baluns
  • Their claimed performance seems too good to be true
  • I don't know how these systems can work when the antenna/balun is non-resonant at most frequencies (except some periodic ones) and presenting a complex load to the receiver/transmitter

Mn-Zn Ferrite Cores For Switching Power Supplies Planar Series

Product.tdk.com   DA: 15 PA: 16 MOZ Rank: 66

  • (2/49) FERRITES 20210308 / ferrite_mz_sw_planar_en.fm Please be sure to read this manual thoroughly before using the products
  • The products listed on this catalog are intended for use in general electronic equipment (AV equipment, telecommunications equipment,

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