What is FrSky D8 Mode? FrSky has developed some communication protocols and D8, D16, LR12 are some of the communication protocols. A receiver and a transmitter have to be in the same communication protocol for it to get bound. D8 is an old protocol and most of the D8 receivers are discontinued till date. 

X4R

X4R is a FrSky D8 receiver features 4 PWM outputs (normal servo) and now includes an option for CPPM output for feeding to flight controllers or other uses. CPPM carries 8 channels on a single servo wire. SmartPort and a traditional A2 port are all located on the side of the receiver and allow you to connect all sorts of great sensors to send data back to your FrSky radio.

Features at a Glance:

  • RSSI (PWM) output
  • Lighter weight and physically smaller than D8R-II & D6FR
  • Two selectable failsafe setting options – native failsafe or user-programmable failsafe
  • External analogue telemetry port (AD

Specifications at a Glance:

Compatibility

FrSky X-series Module (XJT etc.) & Taranis X9D in D16 mode(X4R is not working with D-series Module)

Dimension

40*22.5*6mm (L x W x H)

Weight

5.8g

Operating Range

full range (>1.5km)

Operating Voltage Range

4.0~10V

Operating Current

[email protected]

Number of Channels

4Ch from conventional channel outputs, without SBUS port

 

D4R II

This D4R-II is another FrSky D8 full-featured mini-sized 4 channel receiver by FrSky.What makes this receiver different the D4FR? The D4R-II’s data port allows you to connect a sensor hub so you can connect GPS, Variometer, temperature, RPM and all of the other great FrSky sensors. It also has 2 full-length detachable antennas. All of this is available in a package just a little larger than the D4FR.

 

Features at a Glance:

1) Firmware upgradeable

2) One external analogue telemetry port and one digital data-stream port (connect to FrSky Sensor Hub FSH-01)

3) RSSI (PWM) and CPPM output – If CH3 and CH4 are connected by a jumper, CH1 will output CPPM for CH1~CH8, and CH2 will output RSSI (PWM)

4) Lighter weight and physically smaller

5) Alarm warning on low voltage, poor reception, etc.

Specifications at a Glance:

Dimension

40*22.5*6mm

Weight

5.8g/5g (naked)

Operating Range

full range (>1.5km)

Operating Voltage Range

3.5~10V

Operating Current

60mA

Number of Channels

4ch

 

FrSky D8 R XP

The FrSky D8 R-XP is a special receiver that is identical to the D8R-II Plus, but it has added the RSSI and CPPM outputs commonly used for FPV aircraft. CPPM can reduce wiring to some flight controllers, a single servo extension can carry all 8 channels to the flight computer. Furthermore, CPPM output can be used as a wireless trainer system (wireless trainer cable).

The RSSI output is for use with On-Screen Display (OSD) systems that are common in the First Person View (FPV) vehicles. (All FrSky telemetry receivers send RSSI levels back to the transmitter, but this receiver can output this data for use with an OSD)

Features at a Glance:

1) Two external analogue telemetry ports (A1&A2) and one digital data-stream port (Rx)

2) RSSI (PWM) and CPPM output – If CH3 and CH4 are connected by a jumper, CH1 will output CPPM for CH1~CH8, and CH2 will output RSSI (PWM)

3) When side port pins of A1 and X are connected by the jumper, A1 will change from external analogue telemetry port to internal built-in battery voltage sensor

4) Firmware upgradeable

5) Alarm warning on low voltage, poor reception, etc.

Specifications at a Glance:

Dimension 55*25*14mm

Weight 12.4g

Operating Range full range (>1.5km)

Operating Voltage Range 3.5~10V

Operating Current 100mA

Number of Channels  : 8 channels

TFR8S

TFR8S replaces the TFR8 and it is FrSky D8 receiver. The 8S can work with the transmitters failsafe. Of course, you can still program the failsafe into the receiver if you prefer.TFR8S FASST Compatible 2.4ghz Receiver compatible with all Futaba FASST transmitter systems for air and ground  R/C applications and can be doubled up with another TF receiver for expanding to 8 channels

Features at a Glance:

1) Parallel with another TFR8/TFR8S to become a 14 channel FASST compatible receiver

2) Two selectable failsafe setting options (use native failsafe on radio side or set failsafe on TFR8S side)

3) Firmware upgradeable

Conclusion

Most of the FrSky D8 receivers are discontinued or either they are all pretty outdated. The last resort still standing is that some of the tiny whoops still comes with FrSky D8 mode. Hope this article has helped someone to compare some of the best D8 receivers released by FrSky in the past few years.