Notes from the Team-Legit tech department:
These receives come with the S.port jack separate from the receiver's PCB. Soldering the jack to the board is required to use the supplied S.port cable. Alternatively, wires can be directly soldered to the board.
The RX4R receiver is slightly thinner than the RX6R, due to the servo connectors laying prone rather than standing vertically.
The RX4R features 4 PWM outputs with higher precision and lower latency than ever before.
The RX4R is a standalone receiver with all the functions of X4R, it features 4 PWM outputs with high precision and low latency. The PWM output latency is 9ms less than that of the X4R in high speed mode. The RX4R also supports the redundancy function, this means you can add another receiver as a back-up in case the first one fails. Last but not least, the RX4R and the whole RX-line has a 40% increased operating range compared to the previous X series receivers.
Small and High sensitivity (40% increase of the range compared to previous X series receivers)
Higher precision PWM and Low latency PWM output
Lower power consumption
Redundancy function supported
Smart Port enabled and telemetry data transmission supported
Battery voltage detection supported
2 detachable IPEX 4 connector antennas
PCB protection with the comformal coating craftwork
Dimension: 18×17×7mm (L×W×H)
Weight: 2g/ 2.4g (with two antennas)
Number of Channels:16CH (1-4CH PWM from conventional channel outputs, 1-16CH from SBUS OUT port)
Operating Voltage Range: 3.5V-10V
Operating Range: >2km
Servo Frame Rate: 9ms (HS—High Speed Mode)/18ms (FS—Normal Speed Mode)