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FrSky X8R 16ch Receiver, SBUS, Smart Port - PCB Antenna

The X8R is in a Smaller package then previous 8 channel receivers, but has so much more capability. The new Smart Port supports the new hub-less sensors as well as the older hub analog sensors.

The X8R supports 8 standard servo outputs, and you can access all 16 channels by using the Sbus line with Sbus supported servos or use a FrSky S.BUS Decoder for the full 16 channels. Or you can use 2 X8R receivers in combination and the channels will sync 1-8 on the first and 9-16 on the second.

The new X8 protocol is also backward compatible! In D8 mode it work with the DHT, DJT, DFT and DHT-U transmitter modules. In this mode you only have access to 8 channels but you still get to use the new Smart Port and digital sensors! And even cooler is the new antenna design “PCB” it reports up to a 20% gain in range over their older antennas. And the X8R is Firmware Upgradeable!

This is the perfect receiver for the FrSky Taranis, with its built in XJT Module or any of the D8 systems to take advantage of the new digital Smart Port sensors.


Dimension: 46.5mm x 27mm x 14.4mm (1.83" x 1.06" x .56")
Weight: 16.8g (.59 oz)
Operating Voltage Range: 4V-10.0V
Operating Current: 100mA@5V
Operating Range: >1.5km (Full Range)
RSSI output: analog voltage output (0~3.3V)


PPM output vs Sbus

"PPM or CPPM is an analog protocol that sends a series of servo channel controls as a series of pulses. Each servo channel is one pulse and the servo position is determined by the width or duration of the pulse. The first pulse is channel 1, the second is channel two, the third is channel 3, etc. The end of the sequence and beginning of the next is marked by a pulse that is about twice as long as any possible servo pulse. Before digital radio systems this PPM stream was generated by the encoder in the transmitter and broadcast as-is all the way to the receiver where the the pulses were separated out and sent to each individual servo. With the advent of digital radios this PPM stream was translated into digital codes in the transmitter before being broadcast and the receiver converted this digital information back into the old time width control pulses for the servos.

S-Bus, X-Bus, and several other similar 'Bus' systems remove this analog pulse width servo control entirely and send the servo position control to the servo as a digital code. This removes the inaccuracy and insecurity of the simple analog pulse width and allows all servo channels to be sent on one wire as a digital packet with the servo number and position data being sent and each servo only responds to its number. This digital data can be sent many times faster than the analog PPM stream as well, which is another advantage of the digital bus system.

The X8r receiver does not have a PPM (or CPPM) output. What it does have is S-Bus which is a digital data stream which carries control information for all of the channels. Apparently the Naza D-Bus selection is compatible with the S-Bus spec that FrSky is using. If it works on the bench then this should work in the sky. Digital communications either work or they do not - there is no maybe, there is no sometimes. Either the protocol is understood by the controller or it is not...


TheAeronut - RCG


All 16 channels require the FrSky Taranis, or the XJT module.
For 8 channels in D8 Mode you can use the FrSky Taranis or XJT, DJT, DFT, DHT and DHT-U modules