RADIO MODULE ERTX-01
ERTX-01 is a compact 868 MHz bi-directional radio module powered by Semtech’s LoRa modulation technology. The module provides ultra-long-range broadband communications and high noise immunity with minimal power consumption.
|Enclosure dimensions||20,0 x 25,0 x 2 mm|
|Sensitivity||up to -137 dBm|
|Radio module control||via UART using AT commands|
|Digital input and output|
|Supply voltage||2.4 to 3.6 V|
|Antenna path resistance||50 ohm|
|Output power level||up to +19 dBm|
|Communication line budget||up to 156 dB|
|Range of action||up to 15000 m (within line of sight)|
|Sleep consumption||2 μA|
ERTX-01 radio module is a high performance ultra long range wireless communication module. The module operates in the ISM-band 868 MHz and includes all the necessary components of the radio path.
ERTX-01 uses Semtech’s proprietary LoRa modulation, which combines a spread spectrum modulation, a chirp spread spectrum (CSS) variation in which data is encoded in broadband pulses with a frequency that increases or decreases over time.
LoRa modulation uses Forward Error Correction (FEC). The high sensitivity of the module, combined with the built-in +19 dBm power amplifier, achieves the industry’s highest link budget.
The module is designed as a product intended for installation on a custom board of an end device, is optimized for surface mounting and has a minimum number of required external connections.
LoRa modulation technology
ERTX-01 uses Semtech’s patented LoRa spread spectrum modulation method. LoRa spreading modulation is performed by representing each bit of a data packet in multiple chips.
The rate at which the data packet is transmitted directly is called the symbol rate, the ratio between the nominal modulation rate and the symbol rate per bit of information.
In LoRa mode, ERTX-01 radio module offers three bandwidth options: 125 kHz, 250 kHz and 500 kHz, with SF from 7 to 12.
To further improve the robustness of the radio communication channel, ERTX-01 uses cyclic coding with different coding rates. This coding scheme allows for forward error detection and correction.