Understanding Baluns, UnUns, and Common Mode Chokes in RF Circuits
Discover the differences between Baluns and UnUns for impedance matching, explore current vs. voltage Baluns, and learn about Common Mode Chokes to minimize interference in radio frequency setups. Dive into various types of Common Mode Chokes and find useful resources for optimizing your RF systems.
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Presentation Transcript
Baluns are designed to match impedances between balanced and unbalanced circuits, whereas ununs provide impedance matching between two unbalanced circuits.
There are two main modes of baluns: current baluns and voltage baluns. Current baluns operate by forcing equal currents on both balanced lines, effectively eliminating common-mode currents. Voltage baluns force equal voltage on each balanced line; this is ultimately a better fit for impedance matching applications.
What is a Common Mode Choke? To present a relative large impedance to common currents that flow over the coax outer shield/screen in order to reduce/eliminate radiation from the screen of the coax.
Types of CMC A. COILED COAX ie self-supporting B. COILED COAX ON A FORMER CHOKE C. FERRITE BEADS OVER COAX D. COAX WOUND ON A LARGE TOROID
Types of CMC contd. E. COAX LOOPED THROUGH FERRITE CORES Commercial kit (HF Kits)
Useful Links The Radio Rover https://www.youtube.com/channel/UC5QimXRvJ72gABQ2dGj_9Jw Which Balun, UnUn or Choke to use and why? https://www.youtube.com/watch?v=A2Tq7AWIRwE MM0OPX - Best Ferrite Core For a 100w End Fed Half Wave Antenna https://www.youtube.com/@MM0OPXAmateurRadio End Fed Half Wave Transformers.......Are they as good as we think? https://www.youtube.com/watch?v=nZ-G4hJCTSM
