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
RTL-SDR for HF Marine GMDSS/DSC on SDRAngel
Introduction In previous posts I looked at decoding GMDSS/DSC HF & VHF signals using Multipsk on a Windows 10 Laptop & RaspberryPi4 (Refs.1/5). In this post I decode HF DSC signals using SDRAngel on a Windows 10 laptop. GMDSS/DSC HF Reception Parameter MF/HF VHF Frequency 2187.5, 4207.5, 6312.0, 8414.5, 12577.0, 16804.5 KHz 156.525MHz Baud Rate… Continue reading RTL-SDR for HF Marine GMDSS/DSC on SDRAngel
PlutoSDR for AM Modulation on GNU Radio
Introduction In a previous post I looked at using the PlutoSDR as a WSPR beacon (Ref.1). The PlutoSDR can be used to demonstrate standard AM Modulation as shown in Figure 1. Transmission is via a shielded sma cable plus 40dB pad to 3 test receivers: A Signal Hound spectrum analyzer, RTL-SDR and PlutoSDR receiver (Ref.2).… Continue reading PlutoSDR for AM Modulation on GNU Radio
CelNav Sept Full Moon Lunar Distance
Introduction I am reading a fascinating book about the ocean depths by Susan Casey (Ref.1). She describes an ancient chart by Olaus Magnus of Sweden, depicting in graphic detail the oceans around Scandinavia and the monsters hiding in the depths, waiting to devour unsuspecting sailors (Ref.2)! I immediately thought of Joshua Slocum sailing alone around… Continue reading CelNav Sept Full Moon Lunar Distance
ATSC Television Antenna Testing with NanoVNA
Introduction Several years ago I purchased a compact television antenna to use on my apartment balcony to cut down on cable costs. My balcony has line of site view of the CN Tower which hosts many television and broadcasting transmitters (Ref.1). So far I have tested pretty well every antenna I have with the versatile… Continue reading ATSC Television Antenna Testing with NanoVNA