We test for the BEST capacitor in the 49:1 UnUn / balun matching transformer for the 40-10m End Fed Half Wave EFHW ham radio antenna.
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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 the best configuration for 49:1 unun / baluns using the different types of windings, cores, and capacitors for the matching transformer. After the changes we do insertion loss tests and compare the efficiency to the other transformer configurations.
👉 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
https://www.mouser.com/ProductDetail/810-CC45SL3FD101JYVN
Mouser #:810-CC45SL3FD121JYGN
Mfr. #: CC45SL3FD121JYGNA
Description: Ceramic Disc Capacitors D: 9.5mm 3kV 120pF SL 5%
https://www.mouser.com/ProductDetail/810-CC45SL3FD121JYGN
Mouser #: 810-CC45SL3FD151JYGN
Mfr. #: CC45SL3FD151JYGNA
Desc.: Ceramic Disc Capacitors D: 10mm 3kV 150pF SL 5% LS:7.5mm
https://www.mouser.com/ProductDetail/810-CC45SL3FD151JYGN
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.
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Thanks for watching!
*Chapters*
00:00 Intro
00:31 Description of test setup and process
01:35 Swap out 100pf capacitors for 120pf capacitors
14:30 Back to Back setup of 49:1 with 120pf caps
16:20 Start tests for 120pf capacitors
21:39 150pf capacitor tests
26:05 Test Results for all 3 capacitors
30:26 Summary
32:55 Outro
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#hf #capacitor #hamradio #49:1 #balun #efhw #antenna #howto #hfradio