Best 49 to 1 UnUn for EFHW End Fed Half Wave HF antennas

Video Description

How to build the best 49:1 UnUn / balun matching transformer to use with your End Fed Half Wave EFHW ham radio antenna. Antenna Length - 64 feet Counterpoise - 6 ft 6 inches Wire - 22 awg (as in affiliate links below) *Timestamps* 00:00 Intro 00:25 Transformer description and materials 02:16 Location of tap on winding 05:49 Attach tap to winding 07:37 Start winding toroid core 15:25 Attach 100pf TDK capacitor 23:01 Test UnUn with NanoVNA 27:33 Results of Insertion Loss and Efficiency tests 34:19 Antenna setup 35:35 Antenna test with NanoVNA 40:35 Antenna test with radio and SWR meter 43:09 Summary 45:43 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. No monthly commitment needed — one-time is perfect. 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/budgethamradio 👉 Like this video? For more videos similar to this, click here - https://youtube.com/@BudgetHamRadio?sub_confirmation=1 👉 If you haven't watched the previous videos that goes through the build steps, here is the link: https://youtube.com/playlist?list=PLVGuFAwp8kOXp5dnANeMdYzcSbxUSR8fU&si=S0eoFY4z045DR7GP This video is one in a series that shows how to build a 49:1 unun / baluns using the different types of windings, cores, and capacitors for the matching transformer. After the step by step builds we do insertion loss tests and compare the efficiency to the other transformers. *Source for Fair-Rite 2643251002 toroids* (No commission) https://www.digikey.com/en/products/detail/fair-rite-products-corp/2643251002/8594030?s=N4IgTCBcDa4GwBYDMYCsBGADJiBdAvkA *Source for TDK capacitors - Mouser Electronics* (No commission) https://www.mouser.com Mouser part # 810-CC45SL3FD101JYVN MFG Part No: CC45SL3FD101JYVNA Description: TDK D: 8.5mm 3kV 100pF S / Ceramic Disc Capacitors 👉 All my videos on how to build 49:1 matching transformers - https://www.youtube.com/playlist?list=PLVGuFAwp8kOXp5dnANeMdYzcSbxUSR8fU 👉 For my other how to videos featuring baluns, ununs, chokes, or filters - https://www.youtube.com/playlist?list=PLVGuFAwp8kOWsi1w5k5xniGaTXuA_fl6N 👉 For my other how to videos on DIY homemade antennas - https://www.youtube.com/playlist?list=PLVGuFAwp8kOWRIgOz_qUMrdTA1wsWmja0 👉 For my other videos on how to use the NanoVNA - https://www.youtube.com/playlist?list=PLVGuFAwp8kOWiuZ0zH4BMaP0w7tMB31Tz 👍 Be sure to Like, Share, Comment, and Subscribe. #hf #hamradio #49:1 #balun #efhw #antenna #howto #hfradio #unun