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What is the purpose of a balun and a unun in a feed line?
Feb 11, 2015 · An unun is an impedance transformer, usually 4:1 or 9:1, which matches an unbalanced antenna to a feedline. A 9:1 transformer is often used for an end-fed half wave antenna. This document by Jim Brown (K9YC) is long, but tremendously helpful in understanding baluns, chokes, and reducing RF noise:
Ham.stackexchange.comRecommended 9:1 unun core type (s) - Amateur Radio Stack …
Mar 10, 2016 · 2. KB9RLW Kevin Loughin has a good YouTube video on his 9:1 unun build. He used it for his HF vertical fed like an end fed antenna. I built one of these with full success for an elderly ham who also uses a manual tuner and/or his …
Ham.stackexchange.comHow to make a 1:2 UnUn - Amateur Radio Stack Exchange
Apr 1, 2022 · He's focused on higher ratio ununs, but shows the general design principles that you can use to make a 2:1. One of the key principles is that the impedance transformation is the square of the turn/winding ratio, so you're looking to wind a 1.4:1 ratio (since 1.4 * 1.4 ~ 2). With the ratio math out of the way, now you can focus on translating
Ham.stackexchange.comDo I need an 9:1 UNUN for a half-wave end fed?
Dec 10, 2018 · 4. An end fed, 1/2 wavelength antenna will have a relatively high impedance of 5k ohms or more. So a 9:1, or greater, ratio of balun may reduce the impedance sufficiently to help your tuner get a match and help avoid a voltage flash-over in your tuner. However, there is another issue that may require some planning.
Ham.stackexchange.comWhy do 9:1 ununs use type 2 material for the core?
Feb 17, 2024 · That said, you certainly can build a 9:1 on a higher-permeability core, and you can use a ferrite like type 43 without too much worry about core loss. Compare these three designs investigated by VK6SYF: The two wound on ferrites require fewer turns and have lower SWR over a wider frequency range. The LO-1238 unun has significantly lower loss
Ham.stackexchange.comHi SWR with End Fed HF Wire 9:1 UNUN - Amateur Radio Stack …
Oct 27, 2022 · 1. Remember an antenna using a 9:1 matcher is meant to use a tuner, whether in your radio or external. The idea is to bring the impedance if a "random wire" down to a value your tuner can handle. The SWR values you show are right where they should be. A lot of internal tuners are limited as to how large of impedance they can handle.
Ham.stackexchange.comCan I wind my 9:1 unun with two wires instead of three?
Jun 4, 2021 · 3. For illustration, here's a 9:1 unun construction using 3 wires from M0UKD: Since the A and B windings are connected together in series, there's no compelling reason you couldn't replace them with one longer wire that has the same number of turns. For an ideal transformer only the number of turns would matter, and how those turns are arranged
Ham.stackexchange.com9:1 unun material and power loss - Amateur Radio Stack Exchange
Feb 21, 2020 · In parallel I checked on Google about the correct toroid etc so I found 2-3 pages with designs. My focus is on power loss as I run QRP on batteries. 9:1 voltage unun using a L15 ferrite core. 9:1 Voltage unun - FT240-61. 9:1 voltage …
Ham.stackexchange.comHow is a 1:1 current balun different from a choke?
5. The name choke refers to the electrical component, whereas the name 1:1 current balun refers to the job it is doing. There's more than one way to construct a balun. There are purposes for a choke that are not baluns. Share. Improve this answer.
Ham.stackexchange.comIssues with high SWR on HF Kits EFHW 49:1 UnUn kit
Mar 21, 2022 · This is my first time making an unun and EFHW kit. For this I have a nanoVNA running 10 segment sweeps on the unun with two gator clips on each end. Between the gator clips sit one 100 ohm resistor and two 1.2k ohm resistors which my Fluke tells me gives about 2420 ohms of resistance, which is close to the 2.4k ohms resistance I've seen used in …
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