Category: R9M

  • How to make 868MHz or 915MHz dipole antennas for FrSky R9 or TBS Crossfire receivers

    The correct length of 868/915MHz antennas used by FrSky R9 and TBS Crossfire is: for FCC 915MHz it is 75mm for EU/LBT 868MHz it is 80mm From time to time FrSky has a big problem with cutting their antennas to a correct length. Good thing, you can make your own TBS Crossfire RX antennas for…

  • How to flash FrSky R9 Mini, R9 Slim and others with your radio

    FrSky is not making things simple with R9 long range system. New firmware appears quite often and there is no way to flash receivers over the air. You can use some PC software, passthrough from FC and things like that, but from my perspective, as long as you can get to the receiver itself, the…

  • FrSky R9M and R9 Slim long range radio system review

    When FrSky R9M long range transmitter and FrSky R9 receiver series started to pop up some time ago, there was a lot of speculations “it is any good?” “is it a Team Black Sheep Crossfire killer” “cheap Crossfire alternative?”. In time, new firmware started to appear, new receivers and so on. And oh yes, EU…

  • DIY Dipole for Crossfire and FrSky R9M

    Details for halfwave dipole for an 868MHz band are quite simple: two 0.8mm copper wires (used for welding) cut to 77mm and solder to the end of coax cable. Here I’ve used RG178 put that thing into a 3D printed casing put antenna tubes around wires. I got mine from here: http://bit.ly/2vHHqDk glue everything together…

  • DIY Moxon antenna for TBS Crossfire and FrSky R9M

    Moxon antenna in layman terms, it’s probably a simplest linearly polarized directional antenna. It’s like a bent halfwave dipole with a bent reflector in a back. Think about it as a very simplified Yagi antenna. It does not have much gain but has very good backward rejection. And thank’s to a simplicity, Moxon is super…