This is the talk that I presented at the RSGB Convention in October 2018.
Update: RSGB have now released the video at https://thersgb.org/members/resources/?id=5762 (member login required; it will probably be several more months before the video is transferred to YouTube).
I always cringe to hear myself talking, but the sound track does add some context to the previously released slide pack ( still available here ).
Even without the voiceover, the important points are clear:
- Today, “baluns” are about controlling interference, reducing noise
- Choke baluns are best for doing this.
So we should aim to:
- Minimize common-mode RF currents on the outside of the coax
and along the boom.
- Don’t upset the good feedpoint balance that VHF-UHF Yagis already have.
Comments and discussion, please! This is new information for VHF-UHF, and certainly not the last words to be said about it. It’s still very much ‘work in progress’.
Leave a reply
Technical slide content © 2018 Ian White, GM3SEK
Slide template © 2018 RSGB
Images as attributed (except where that would be embarrassing).