How to build the best 49:1 UnUn / balun matching transformer to use with your End Fed Half Wave EFHW ham radio antenna.
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Antenna Length - 64 feet
Counterpoise - 6 ft 6 inches
Wire - 22 awg (as in affiliate links below)
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👉 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.
👉 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
Thanks for watching and 73's.
Jerry
KM4ZKB
*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
A list of links is provided below if you would like to purchase anything seen or mentioned in this video. If you buy through these links I will earn a small commission on each sale which will help to support the channel to provide more videos. It will not affect the price you pay.
*Amazon Affiliate Links*
16 AWG Magnet Wire, 4 oz - https://amzn.to/3ZSafdQ
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FT240-43 Amidon Toroid Core (need 2) - https://amzn.to/3PeOaRz
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Battery Charger 20ah - https://amzn.to/3AFj3Li
(works with multiple battery types and sizes)
Battery Power Meter Analyzer - https://amzn.to/4fWHT8C
Antuner - Antenna Tuner Power SWR Meter - https://amzn.to/3NXq2Cn
Goture 21 ft Carbon Fiber Pole - https://amzn.to/4hGZiDO
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Thanks for watching!
*Chapters*
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
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#hf #hamradio #49:1 #balun #efhw #antenna #howto #hfradio