Frsky RX4R – 2.4GHz Receiver Review

Hi everyone, I am Mirko, and today we see this new receiver at 2.4ghz of FrSky. This is the RX4R, if you want to buy it find the link in description. Inside the package we find the receiver, two cables for connection an instruction manual and a jumper set. The RX4R is a 16-channel receiver with telemetry, and takes up the features of the previous version: the X4R. In fact, more than 16 channels can be used with the SBUS protocol, we can choose to use it with 4 PWM channels, combining it for example with a fixed wing. The PWM protocol is extremely precise, the latency is less than 0.5 microseconds. A very interesting feature is the maximum range of this receiver. The RX4R increases the range by 40% compared to other X-series receivers, such as RXSR, XM+ etc. The specifications now speak of a distance of more than 2Km, compared to 1.5km for the other receivers. The BIND is done with the MODE D16, so we can use it with a Taranis, a Horus, multi-protocol radio or Nirvana if you have the external XJT module. Let’s take a look at the layout of the RX4R, we leave out the pins for the servo connector because for a miniquad FPV we do not care. Starting from the left we have the ground and the positive. The receiver can be supplied with a voltage between 3.5V and 10V, I suggest to power it through 5V BEC, so the power consumption will be 100mA. This is the SmartPort pin we need for telemetry, then we have AIN2 which is the integrated voltage reader. Thanks to this pin we can know the battery charge level directly on the remote control. This is useful if we don’t have an OSD and can’t use the smartport cable. The SBUS_OUT pin is the one we need to use to connect the receiver to the flight controller, while SBUS_IN should only be used to use a second redundant receiver. For FPV, however, only one receiver is needed, so we use the SBUS_OUT pin. At the bottom of the board we have a SmartPort pin with inversion. This is useful if we have an F4 flight controller without a dedicated FrSky telemetry pad. The antennas are 15cm long, the exposed part is about 33mm long. The connector is IPEX4. Compared to other FRsky receivers the cables are bigger, so they are more resistant and of good quality. The RX4R is fully compatible with the RSSI signal, to activate it on Taranis you can follow my tutorial by clicking the tab at the top right or the link in description. However, if you hold down the Bind button for about 5 seconds The RSSI signal is automatically passed through channel 16. This way there will be no need to do any configuration on our remote control. In conclusion I can say that the RX4R is the best choice among FrSky receivers on the 2.4Ghz frequency. I’ve already tested it, the signal has remained stable and the RSSI high. The advantages are certainly the small size, the quality of the antennas and the improved range of 40%. I would have preferred instead that the pins for the servo cables were not already soldered on the board, giving users a choice as to whether or not to solder them, so as to have even more compact dimensions However, the pins can be easily removed, If you want to remove them find my tutorial on how to do it in description This was my review of the FRSKY RX4R receiver. Thanks for watching the video please like and subscribe. If you want you can also support me on Patreon by clicking the link at the end of the video.

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