Marine GMDSS/DSC VHF Decoder_c

Introduction In previous posts I looked at various aspects of GMDSS/DSC using Scicos & GNU Radio (Ref.1/9). In this post I look at the underlying specification ITU M.493-16 and how the frame structure is assembled (Ref.10). The specification covers everything in great detail! It reminds me of working with X.25. I will generate a basic… Continue reading Marine GMDSS/DSC VHF Decoder_c

HF SDR-IQ for Olivia 64-2000

Introduction During the past several years I have received broadcasts from Short Wave Radiogram using the RTL-SDR and SDR-IQ receivers. These broadcasts featured transmissions using MFSK32/64 which I decoded with FLDIGI and Multipsk (Ref.1/3). These broadcasts illustrated the amazing noise performance of MFSK. Last week Short Wave Radiogram added a segment using OLIVIA 64-2000 (Ref.4).… Continue reading HF SDR-IQ for Olivia 64-2000