How to build the 9:1 UnUn / balun matching transformer to use with a random wire antenna. This video shows step by step how to wind a 9:1 unun.
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This video is one in a series that shows how to build your own balun and unun matching transformers. After the step by step builds we do insertion loss tests and take other measurements as needed such as resistance, SWR, etc.
👉 For my other how to videos detailing how to build 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
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*
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*Source for Fair-Rite 2643251002 toroids* (No commission)
https://www.digikey.com/en/products/detail/fair-rite-products-corp/2643251002/8594030?s=N4IgTCBcDa4GwBYDMYCsBGADJiBdAvkA
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Thanks for watching!
*Chapters*
00:00 Intro to building your own 9:1 unun
00:38 Build description for the 9:1 matching transformer
01:28 Toroid core size and mix type
01:58 Wire type and length needed for unun
02:40 Start winding 9:1 toroid core
10:21 9:1 wiring diagram explanation
11:24 Make winding connections
20:15 Verifying the 450 ohm load resistors
23:10 Test 9:1 UnUn with NanoVNA for impedance matching
27:23 NanoVNA testing for Insertion Loss
31:59 Summary
33:31 Outro
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#hf #hamradio #9:1 #unun #balun #random #wire #antenna #howto #hfradio #diy #homemade