There are common mis-conceptions about the jobs that UN-Un's, Bal-Un's and chokes do with regard to amateur radio end fed half wave, random wire and di-pole antennas. This video takes a broad and high level view of the subject. Hopefully useful for the beginner and more experienced ham.
Colin MM0OPX has an excellent youtube channel, in particular the work done on finding the most efficient UnUn:
https://youtu.be/nZ-G4hJCTSM
Most photo credits are due to VK6YSF and many of the circuits described are from his great website:
9:1 UnUn
http://vk6ysf.com/unun_9-1.htm
1:1 Balun
https://vk6ysf.com/balun_guanella_current_1-1.htm
The 49:1 drawing is from here:
https://www.linuxwolfpack.com/end-fed-half-wave.php
Info. on which random wire lengths to use and which to avoid
https://www.hamuniverse.com/randomwireantennalengths.html
HamGoodies Store
https://www.hamgoodies.co.uk/
How to wind a 9:1 (one of many videos on the subject):
https://youtu.be/MOSf-k3ofUY
73, Fraser MM0EFI
#hamradio #unun #balun #efhw #randomwire #antennas #ferrite #portableradio