FrSky ultra mini receiver R-XSR is that the evolution of FrSky full range XSR receiver. The R-XSR may be a standalone receiver with all the functions of XSR, additionally, it’s almost 1/3 size and 1/3 weight of XSR receiver. Moreover, Frsky R Xsr redundancy function is integrated into this small receiver ensures the safety, and therefore the IPEX connector makes it more convenient for you to exchange antennas.

The Frsky R-XSR receiver is that the smallest RX which will do 16 channel SBUS and SmartPort telemetry. It’s the go-to option now and replaces the XSR or X4R-SB for Frsky TX users who own Frsky transmitters like the X9D and QX7.

When you ask an experienced mini quad pilot using Frsky TX, “What’s the simplest Frsky receiver?” the solution is perhaps getting to be “XSR” or “X4R-SB”. But the new Frsky R Xsr could be the new answer thereto question.

Nowadays, the subsequent features became the quality for Frsky mini quad receivers:

  • SBUS
  • SmartPort telemetry
  • Diversity Antennas (full range)
  • Small and lightweight weight

And the R-XSR ticks all the boxes yet it’s tiny compared to the XSR and X4R. It’s basically just the XSR but during a much smaller form factor. It comes with IPEX antenna connectors so you if damage the antenna you'll easily buy a replacement one and replace it.

New Feature – Receiver Redundancy

When I read through the manual of the Frsky R Xsr, I found it's a replacement and interesting feature called “Receiver Redundancy”. If you check out the pin-out of the R-XSR, you would possibly realize there are the SBUS_IN and SBUS_OUT ports.

What it does, is allowing you to attach a separate SBUS receiver to the “SBUS_IN” of the R-XSR. When the R-XSR fails and loses signal, the opposite receiver will attempt to take over.

But not both receivers are connected to an equivalent Taranis internal TX module, you'll also need a separate TX module like the XJT module plugged in to the TX module bay on the rear of your Taranis.

So there would be two separate connections. you'll even use a separate Taranis TX instead of an XJT module if you would like. In my opinion, this is often quite a cool concept could save your quad from hardware failure and bad signals, but I don’t see it getting used by ordinary pilots and racers thanks to the complexity of the setup and therefore the cost for extra equipment.

However, the new Frsky R XSR isn't perfect and you would possibly not want it to catch on, just yet. As we speak, LUA script remains not compatible yet (which allows you to vary PID, rates, VTX settings etc from your Taranis). As far as we all know this could be fixed soon with a firmware update. Update (Oct 9th, 2017): Frsky has just fixed the difficulty with LUA script, confirm you update your R-XSR with this latest firmware. Here is that the instruction the way to flash Frsky receiver firmware.

The second issue is finding the uninverted Smart Port signal. it's possible to urge the uninverted S.Port signal on the board a bit like other receivers as shown during this tutorial, but the pin is so tiny it’s quite challenging to solder on.

Finally, the antennas aren't optimal. I wish they only follow the XSR and solder the antennas on to the receiver instead of using those fragile IPEX connectors which are only designed for a couple of mating cycles.

And a bit like the XSR, the R-XSR is using “1/5 wavelength” antennas, which suggests the antenna elements shorter than the first X4R-SB of 1/4 wavelength antennas. many of us including have reported range issues and complained about it to Frsky. We’ve been told the rationale behind this design is to scale back the prospect of a prop strike, which doesn’t make much sense, to be honest. However, if you're having range issue, you'll simply strip the antenna shielding to increase the antenna element and experiment until you discover your desirable length.

If none of those issues bothers you, then you ought to definitely catch on while they're still available. But due to the discharge of the new RX, the old XSR prices have dropped considerably to only about $17.

The Frsky R Xsr uses smaller IPEX connector for the antennas than the first X4R-SB receiver, they're called “IPEX 4th Generation”. take care when shopping around for antenna replacement.