We have already looked at the FrSky RXSR receiver and how it stacks up against the ever-popular XM series of receivers including the XM and the XM+. The full-range tiny receiver is So, in this article, we will look into the FrSky R XSR 2.4GHz overview and antenna replacement scheme for the receiver and what you can do to avoid damaging those fragile antennas that get easily cut off at the smallest crash.

The FrSky R XSR 2.4GHz Receiver

The FrSky R XSR 2.4GHz receiver is a tiny, long range receiver from FrSky that has all the capabilities of the XM series receivers plus S.PORT, F.PORT and a longer range as well.

 

The R XSR is basically a smaller version of the ever-popular XSR receiver with a smaller form factor and still keeps the full-range capability.

The RXSR is one of the smallest receivers from FrSky that can do 16CH SBUS along with S.Port telemetry. Usually considered as the new de-facto choice for all FrSky based radio systems, the R XSR has found its way into all products like whoops and full-size drones

Specifications & Features

  • Dimension: 16*11*5.4mm (L*W*H)
  • Weight: 1.5g
  • Number of channels: 16CH
  • Operating Voltage Range: 3.5V~10V
  • Firmware Upgradable
  • Compatibility: ACCST D16 / ACCESS mode
  • Small size and lightweight
  • Telemetry support with S.PORT
  • Full range
  • Switchable SBUS/ CPPM signal output
  • Supports redundancy function
  • IPEX connector, replaceable antennas

 

Construction of FrSky R XSR 2.4GHz Antenna

The antenna we usually refer to would be the black colour wire(s) from the receiver but the actual radiating part of the antenna often referred to as the “active element” is the part that actually sends and receives the signal!

These antennas are made up a special cable known as a coaxial cable (or coax for short). This is similar to the type of cable found on your TV connection and is usually made up of 4 parts out of which 2 are insulation and the other 2 for the signal.

 

The first casing/covering is usually a black plastic to protect the delicate insides from physical stress and damage.

The second layer is a ground layer composed of thin intertwined wire strands whose purpose is to protect against noise and disturbance to the signal and also to stop the signal from being transmitted till the particular antenna region - the part where no grounding wire is preset.

The third layer is used as another insulation layer and is directly on the active element/main wire to prevent shorting with the ground layer.

The final fourth layer is that the actual wire where the signal travels from the device it's connected to. This is the actual “antenna” part which as previously explained is also called the active part.

In case you strip your antennas active element(the transparent part where the black plastic shielding is not present), the easiest way to revive and reuse the antenna is just to strip some of that shielding to show 23.5mm of the active element which is different from the usual 31.2mm we see in other receivers.

Make a clean cut right on the antenna right before the area where it got stripped.

Measure 23.5mm from that end and strip the insulation until you are left with the active element. This length of 23.5mm is special for the FrSky R XSR 2.4GHz antenna because FrSky has “tuned” their antennas in the PCB board.

Replacing the FrSky R XSR 2.4GHz Antenna

In the worst case where you lost the whole antenna and, you'll need to order a replacement FrSky antenna from HorusRC. Replacing the antenna is quite. Just unplug it from the receiver and attach the new antenna. While antenna replacement is being done, make sure you are grounded properly, as static discharge from your body can damage the ESD sensitive RF chips on the receiver.

Conclusion

In this article, we have seen about the FrSky R XSR and the FrSky R XSR 2.4GHz receiver antenna and what needs to be done to replace it on your quad for happy flying. This article is not necessarily particularly for the R XSR but can be applicable for other mini receivers as well but with the change that the active elements total length is 31.23mm instead of the 23.5mm for the R XSR as shown in this article.