In this review article, we will look into the FrSky X4R / X4R-SB receiver and its pros & cons and answer the question as to whether you should get one for your craft or project over any other receiver. We will also look into the feature list, compatibility, and other such details of this receiver.

 

Hardware & Pin Layout of the X4R Receiver

 

The FrSky X4R / X4R-SB is a receiver that is mainly targetted towards planes and larger size quads or crafts where size is not a constraint. The X4R / X4R-SB is similar to the XSR but has a plastic cover (which you can remove to save space and weight).

 

FrSky X4R

 

The X4R receiver only outputs 4 PWM servo channels without S. Bus or CPPM support. This receiver is directly aimed at aircraft and planes or ground crafts like hovercraft or even a rover due to the lack of additional channels and the lack of S.Bus & CPPM. It is good for air crafts and rovers because you only use the servos and ESC for throttle. It also comes with support for Smart Port,  although the use cases would be really low -  perhaps for your Flight Controller on your plane or more what FrSky intended it for, sensors and other telemetry products from them.

 

You can see the header pins for the PWM output and the connector towards the side for Smart Port telemetry and the usual two LEDs - Red & Green alone with the F/S button for binding, pretty similar to other FrSky receivers.

 

 

 

 

FrSky X4R-SB

 

The X4R-SB has the same hardware layout as the X4R but with the addition of S.Bus capabilities on channel 4 instead of a fourth PWM output. So, in total, the X4R-SB has 3 PWM channels and 1 S.Bus output for all 16 channels.

 

Like the X4R, the X4R-SB also has two LEDs - Red & Green along with the F/S for binding the receiver with your FrSky transmitters.

 

The X4R-SB is basically the updated version of the X4R with the added S.Bus feature making it more compatible with a wider variety of devices and flight controllers.

 

 

Other Features

 

The Smart Port connector on both the X4R & the X4R-SB also supports FrSky FBVS from with A2 port for simple voltage monitoring as well as other sensors and telemetry systems from FrSky like the TEMS-01 for temperature monitoring of your craft or engine etc. or another example would be the FSH-01 sensor hub, so you can connect multiple sensors to one board which then relays the data to the X4R/X4R-SB receivers for telemetry.

This feature is quite useful in helis and places especially the ones with a petrol or nitro engine where you have to monitor temperature and RPM along with other data.

 

Specifications

 

Let’s now get into the specifications of the X4R / X4R-SB receivers even though it is not long.

 

 

Feature

X4R

X4R-SB

Channel

4

16

PWM

4

3

Telemetry

Yes

Yes

CPPM

No

No

S.Bus

No

Yes

External Analog Telemetry

Yes

Yes

Digital Data-Stream Ports

No

No

Weight

5.4g

5.4g

Dimensions

40*22.5*6mm

40*22.5*6mm

Operating Voltage

4~10V

4~10V

Operating Current

~100mA

~100mA

Operating Range

>1.5KM (Full-Range)

>1.5KM (Full-Range)

Protocol

ACCST

ACCST

 

So, should I get the FrSky X4R / X4R-SB?

 

The short answer would be no, as these receivers are discontinued by FrSky and replaced by better and smaller receivers which provide more functionality.

 

But in case you are still into traditional aircraft or rover usage with the need for sensors and can live without a Flight Controller, this can still be a decent option as it provides you with the analog telemetry option and PWM outputs -  something you don’t see in newer receivers.

 

 

Conclusion

In this review/article review, we have seen various aspects of the FrSky X4R / X4R-SB receivers and how they stack up along with their various pros and cons like the lack of S.Bus in X4R and the missing CPPM in both X4R and the X4R-SB.

I hope this article was useful for you to help you to make your decision about whether to purchase a FrSky X4R.