Ho to retune FCC 915MHz FrSky R9 Mini antenna to Europe 868MHz

https://www.patreon.com/pawelspychalski
In my FrSky R9 Mini antenna video https://www.youtube.com/watch?v=bFuw25GEQmk I stated that probably all R9 Mini antennas with 70mm long active element are probably tuned for 915MHz, and does not work well with 868MHz. I still state this. Only today, let's dig deeper and take a look if we can convert those 70mm long R9 Mini antennas to work nicely in Europe that forces us to use 868MHz, not 915MHz.

NS120SA VSWR meter: http://bit.ly/2vNifiO
R9 Mini: http://bit.ly/2RQb0z8

There are a few ways to do it. You can play with antenna inductance and capacitance (we will not be duing that today), change velocity factor or just change the antenna length. Let's give it a try!

Oh, in a few weeks I will show you how to make at home a perfect R9 antenna without any special tools. Ho cool is that?

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Видео Ho to retune FCC 915MHz FrSky R9 Mini antenna to Europe 868MHz канала Paweł Spychalski