Introduction In previous posts several years ago, I looked at receiving NOAA15/18/19 satellite weather using various configurations with a Windows 10 laptop and a RaspberrPi4 (Ref.1/4). To bring in the new year, I thought I would check out the latest reception. In the last post I used SDR# with noaa_apt & wxtoimg (Ref.1). In this… Continue reading RTL-SDR for NOAA15/18/19 Satellite Weather_b
RTL-SDR for NOAA15/18/19 Satellite Weather_a
Introduction In previous posts several years ago, I looked at receiving NOAA15/18/19 satellite weather using various configurations with a Windows 10 laptop and a RaspberrPi4 (Ref.1/4). To bring in the new year, I thought I would check out the latest reception. Equipment Setup Figure 1 shows the equipment setup for receiving NOAA15/18/19 satellite weather. In… Continue reading RTL-SDR for NOAA15/18/19 Satellite Weather_a
RTL-SDR Rx Power Calibration
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
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