Introduction The RTL-SDR is an incredibly versatile SDR receiver. In the previous post (Ref.1), I looked at the LoRa protocol and its performance over a long distance. It is useful to have an idea of the absolute Rx level in dBm of a received signal. Using the RTL-SDR with SDR#, the absolute level depends on… Continue reading RTL-SDR Rx Power Calibration
Category: Electronics
Electronics: Hardware, Simulation Software, Microcontrollers
LoRa nxKm Walkabout
Introduction LoRa (Long Range) is a very popular protocol for long range communication between low powered battery operated devices (Ref.1). In the previous three posts I looked at sending a packet using a pair of adjacent 915MHz LoRa transceivers, simulating the LoRa symbols and receiver symbol correlation with Scicos (Ref.2/4). In this post I go… Continue reading LoRa nxKm Walkabout
LoRa Scicos Simulation_b
Introduction LoRa Parameter Region/Country Specific 900MHz ISM Freq Band North America (902-928MHz)Europe (863-870MHz) R Data Rate US(902-928): 980bps – 21900bpsEU(863-870): 250bps – 11000bps Bandwidth US(902-928): 125KHz, 500KHzEU(863-870): 125KHz, 250KHz Tx Power US(902-928): 2dBm – 28dBmEU(863-870): 2dBm – 16dBm EIRP SF Spreading Factor 7,8,…..12 Number Symbols 2^SF 128(2^7),……4096(2*12) Fig.1 LoRa Specifications (LoRa Alliance Ref.1) LoRa (Long… Continue reading LoRa Scicos Simulation_b
LoRa 915MHz Transceiver Packet Test
Introduction LoRa Parameter Region/Country Specific 900MHz ISM Freq Band North America (902-928MHz)Europe (863-870MHz) R Data Rate US(902-928): 980bps – 21900bpsEU(863-870): 250bps – 11000bps Bandwidth US(902-928): 125KHz, 500KHzEU(863-870): 125KHz, 250KHz Tx Power US(902-928): 2dBm – 28dBmEU(863-870): 2dBm – 16dBm EIRP SF Spreading Factor 7,8,…..12 Number Symbols 2^SF 128(2^7),……4096(2*12) Fig.1 LoRa Specifications (LoRa Alliance) LoRa (Long Range)… Continue reading LoRa 915MHz Transceiver Packet Test
LoRa Scicos Simulation_a
Introduction LoRa Parameter Region/Country Specific 900MHz ISM Freq Band North America (902-928MHz)Europe (863-870MHz) R Data Rate US(902-928): 980bps – 21900bpsEU(863-870): 250bps – 11000bps Bandwidth US(902-928): 125KHz, 500KHzEU(863-870): 125KHz, 250KHz Tx Power US(902-928): 2dBm – 28dBmEU(863-870): 2dBm – 16dBm EIRP SF Spreading Factor 7,8,…..12 Number Symbols 2^SF 128(2^7),……4096(2*12) Fig.1 LoRa Specifications (LoRa Alliance Ref.1) LoRa (Long… Continue reading LoRa Scicos Simulation_a