High Efficiency 49:1 Impedance Transformer For QRP ?

A high efficiency 49:1 impedance transformer for QRP End Fed Half Wave antennas. The efficiency from 160m to the 10m band is around 90%. It can be build very compact, excellent for portable, camping, SOTA / POTA, etc. I will soon design a minimalist PCB board as well for this one. In the video I build a weather proof 49:1 impedance transformer for my semi-permanent installation of the antenna at the QTH of my caravan.

Get $5 of NEW USER FREE CREDIT using PCBWay. Full feature custom PCB prototype services, PCB assembly, SMD stencils, CNC / 3D Printing: https://pcbway.com/g/gSv3JS

Thanks so much Colin @MM0OPXFieldRadio for all the effort doing the efficiency measurements.

73, YO6DXE

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MM0OPX EFFICIENCY MEASUREMENTS:
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FAIR-RITE 2643625002 QRP:
https://www.digikey.com/en/products/detail/fair-rite-products-corp/2643625002/8594049

FAIR-RITE - 2643251002 ( 100W ):
https://www.digikey.ro/en/products/detail/fair-rite-products-corp/2643251002/8594030

00:00 Intro
01:38 Building The 49:1 Impedance Transformer
03:50 The Importance Of The Core / Toroid
05:48 Efficiency Measurements Spreadsheet
06:17 Sponsor
07:03 Details On Winding The Autotransformer
08:30 Impedance Transformer Hardware
11:44 The Finished Project
13:00 Outro

NOTE:
I’m not an engineer, but I build equipment for fun as way to relax, while enjoying the amateur radio hobby. All videos and projects are built with the limited knowledge I had at the time I recorded each video. Some projects may be updated in time and I publish new videos. Always check for the latest versions ( read the blog articles ).

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Some links and all the discount codes are part of affiliate programs. It doesn’t cost you anything extra, but you support me by using them and you also get better deals on the offered products or services. I always try to reward you with various discounts offered by partners and collaborators.

#efhw #efhwantenna #antenna #49:1 #impedancetransformer #unun #balun #amateurradio #hamradio #pcbway

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