Making QLRS lightest

This is quick guide, showing how to replace SMA connector by tiny U.FL used for 868MHz FrSky antennas, and make really small Qczek LRS RX.

The hardest past of modification is SMA connector removal. I did it using hot air…

Next very important thing (don’t forget about it) is removal part of RF signal trace. It must be done, if you left it under new connector, the capacitance will make your RF signal week. So just cat it as shown below.

Then you can solder new U.FL connector. Please check which pins should be soldered, because sometimes it has 4 pins, 3 for ground 1 for signal.

OK, almost done, add LED, capacitor and shrinking tube.

With FrSky antenna is only 7.3 grams.

And remember to secure connector …

6 thoughts on “Making QLRS lightest

  1. Not sure if this blog and the YouTube channel are run by the same individual; but I figured I would post here just in case. At least this way I can leave my email without it being seen by everyone. Thank you for your time and help with FPV.

    My reply to your message on the YouTube channel:
    Wow!!! That would be absolutely amazing! I’ve just started in FPV and have found it to be incredibly fun and exciting. The amount of information is astounding and the kindness of people more experienced in the hobby is equally incredible. How do I send you a private message? Or make my reply private? Haha.@Krzysztof Kuczek

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