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May 08, 2019, 09:26 PM
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10th Anniversary New RMILEC T4047NB20 V2 400-470MHZ 433mhz UHF LRS Long Range RC Sys

Updated on May 8th, 2019: This is the latest 10th anniversary version of RMILEC NB20 20 Channel UHF LRS System. Comparing to previous versions, it is not only much easier to install, but the heat dissipation and positioning function also have been greatly improved.

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The NB20 system adopts the latest RF technology, providing very high adjacent channel rejection ratio and anti-blocking performance, which gives rise to the outstanding anti-jamming capability of the new system.

The NB20 receiver can detect the frequency and amplitude of EMI interference with unbeatable accuracy and precision based on the extremely low self-noise of -125dBm. The RF performance of NB20 system surpasses the older 4047 systems several orders of magnitude.

Furthermore, NB20 system takes high-speed processor for signal acquisition and output with very high precision. Its high efficiency transceiver can make full use of band width limitation and spend shorter time to work out data exchanging,and frequency calibration.

As for operation, The NB20 system is compatible with any receiver to construct a signal relay system. It is highly compatible with mature products on the present market, such as FUT, JR, HITEC, TDF, FS, XINYI etc. There is no need for consumers to change the old remote control system or any parameter settings to directly extend the remote control range. PWM output-and-input is one-to-one. It can relay signal with very high precision.

By using the powerful forwarding of 20 channels, UAV's parameter can be adjusted in the air, and the aerial cameraman and pilot could work together with single radio. In addition, one transmitter can be shared by several operators. As for the receiver, either EMI or RSSI signal can be displayed on LED, which allows debugging according to the visual signal strength. The new system is of longer remote control distance and higher reliability, because the source of interference can be more quickly and accurately ruled out.

In short the NB20 system offers staggering performance and quality for the long range flying enthusiast and all at an affordable price.

RMILEC NB20 LRS System User Manual



The hardware operating frequency: 400-470Mhz
Use three frequency hopping. Scan interfering frequencies before TX(i.e., Listen Before Talk).


The receiver has the spectral analysis ability with the range of 400~470Mhz, which leads to scan interfering frequencies of on board equipments in detail to frequency band with lowest background noise.


2 ~ 5.8w of transmitting power!
Incorporates the very latest RF technology
High adjacent channel rejection and anti-blocking performance
Superfast processors for signal transmission and signal acquisition
Ultra efficient transceiver system
20 channels of PWM, 18 channel SBUS or up to 14 PPM inputs
  • RF power: 2 ~ 5.8w (peak)
  • Sensitivity: -115dBm
  • Adjacent Channel Rejection: High
  • Anti Signal-blocking: High
  • Operating Frequencies: 435 +/-2.5,445 +/-2.5, 455 +/-2.5, 433ISM (selectable)
  • Signal Of Servo For Transmission: 20ch
  • Signal Of Servo For Output: PWM output 20ch, PPM output 20ch, SBUS output 18ch
  • Input Mode: PPM, PWM, SBUS
  • Input Voltage: 12v DC
  • RF Module Weight: 265g
  • Signal Acquisition Module Weight: 38g
  • Receiver Weight: 30g

The package includes:

1 x R4047NB20 20ch narrow band receiver with detachable antennas
1 X 20ch signal acquisition module
1 x T4047NB20 RF Module with cooling fan
1 x Wiring kit

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