What is the purpose of a balun and a unun in a feed line?
Feb 11, 2015 · I have never understood how a balun or a unun works and under which situation I need to use either of them in an antenna feed line.
Recommended 9:1 unun core type(s) - Amateur Radio Stack Exchange
Mar 10, 2016 · I would like to construct a 9:1 unun that connects my QRP transceiver to a random-wire antenna. The transceiver's antenna connection is an unbalanced BNC jack and the random-wire …
Hi SWR with End Fed HF Wire 9:1 UNUN - Amateur Radio Stack Exchange
Oct 27, 2022 · I would also check the UNUN and make sure it is OK. On most end fed antennas it is a 49:1 transformer. Look for corrosion or moisture as well as obvious issues like broken wires or bad …
impedance matching - Ferrite unun transformer to match antenna ...
Dec 2, 2021 · What other options are available for matching a resistive component of less than 50 ohms? E.g. matching in the range of 5-10 ohms, to 50 ohm coax? Could a "reverse" ferrite unun …
9:1 unun material and power loss - Amateur Radio Stack Exchange
Feb 21, 2020 · 9:1 voltage unun using a L15 ferrite core 9:1 Voltage Unun - FT240-61 9:1 voltage unun using a T-200-2 powdered iron toroid core What do you think regarding power losses and materials? …
Do I need an 9:1 UNUN for a half-wave end fed? - Amateur Radio Stack ...
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 …
Can I wind my 9:1 unun with two wires instead of three?
Jun 4, 2021 · All the 9:1 unun tutorials out there are using three wires to wind, but I was wondering if it is possible to wind it using two wires similar to how this 49:1 is built (https://elginradio.files.word...
Why do 9:1 ununs use type 2 material for the core?
Feb 17, 2024 · 6 I do not understand how a 9:1 unun wound on a T200-2 works. I understand the transformer voltage and current ratios. I have wound several toroid chokes and 49:1 ununs and know …
How to make a 1:2 UnUn - Amateur Radio Stack Exchange
Apr 1, 2022 · Does anyone have a drawing or instructions on how to make a 1:2 unun like the one in the picture below ? I searched this question on this site and on the internet with no luck.
Can I use a 1:1 current balun to feed a 1/4λ vertical?
May 7, 2019 · Looking at the pictures of the LDG RBA-1:1, it looks like the answer is yes. It is just a choke that can be used as either a balun or unun. Note that if the vertical has a resonant feedpoint …