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Introduction Recently I revisited OpenPlotter after a two year interval to see what had changed in the latest version 3 (Ref.1/2). I tested the Starter and Headless images and setup AIS & GPS on OpenCPN. In 2021 I had looked at various aspects of version 2 (Ref.3/13). In this post I will look at the… Continue reading OpenPlotter3 – Marine HF Weather Fax

Introduction In previous posts I looked at various aspects of GMDSS/DSC using Scicos (Ref.2/7). In the last post I built a BFSK Random Data Generator on GNU Radio and in this post I use the random data produced to test a BFSK BPF decoder on GNU Radio. BFSK BPF Decoder Schematic Figure 1 shows the… Continue reading Marine GMDSS/DSC VHF Decoder_b

Introduction In previous posts I have looked at various aspects of GMDSS/DSC using Scicos. In this post I look at a BFSK generator for DSC VHF using GNURadio. The advantage of GNURadio is that it can be directly interfaced with the RTL-SDR and can decode in real time. GNURC Schematic Parameter DSC VHF BFSK Fc… Continue reading BFSK Generator on GNURadio

Introduction In previous posts I looked at receiving GMDSS/DSC HF & VHF signals using a Windows 10 laptop with SDRangel & Multipsk as well as a RaspberryPi4B with Gqrx & GNURadio (Ref.1/5). I also simulated the VHF DSC signal using Scicos (Ref.2). In this post I will make an initial pass at decoding the VHF… Continue reading Marine GMDSS/DSC VHF Decoder_a