How to Build a Common Mode Choke - CMC

This video shows step by step how to build a Common Mode Choke. Timestamps 00:00 Intro 00:49 Start build 01:28 Parts used in build 05:22 Parts List 07:15 Purpose of Common Mode Choke 08:34 Test rig setup 09:57 Test coax and show how turns affect choke 13:31 Winding the choke 17:51 Testing the choke 20:44 Prepare and mount choke to plastic 27:33 Solder connections 33:40 Test completed choke 34:10 Test results 36:12 Hot glue to protect coax connections 38:34 POTA Park Activation 40:56 Install choke 41:39 Antenna Resonance in 20m configuration for 10m? 42:32 QSO's on 20m 44:22 QSO's on 17m 47:48 Outro ☕ Support the Channel – Keep the Tests Coming! These tests, comparisons, and budget ham radio builds take real time, coax, connectors, and test gear. If my videos have helped you reduce RFI, build better chokes, or understand common mode current, or other ham radio topics consider buying me a coffee! 👉 **Buy Jerry a Coffee**: https://buymeacoffee.com/budgethamradio Every coffee directly helps fund more experiments, antenna projects, and honest side-by-side tests. Thank you for watching and 73 de KM4ZKB! Amazon links: I may get a small commission if you buy (at no extra cost to you). Thanks for supporting @BudgetHamRadio! Link to Amazon for items used in this video and others - https://www.amazon.com/shop/budgetham... Local hardware store items: Ring Terminals Hillman 7755 6/32" 1/2" bugle head screws and nuts 👉 For my other how to videos featuring baluns, ununs, chokes, or filters -    • Build baluns, chokes, ununs, filters and m...   👉 For my other how to videos on DIY homemade antennas -    • Homebrew Antennas and equipment   👉 For my other videos on how to use the NanoVNA -    • Using the NanoVNA   👍 Don't forget to Like, Share, Comment, and Subscribe. #commonmodechoke #hf #hamradio #cmc #rf #balun #choke