Introduction In previous posts I looked at decoding GMDSS/DSC signals using Multipsk (Refs.1/4). Recently I have been able to use my balcony again to receive HF & VHF signals. I noticed that I was able to decode VHF DSC using the USB mode, which I had previously set for HF, instead of NBFM. So I… Continue reading VHF Marine GMDSS/DSC Decode & Scicos Simulation

Introduction In previous posts I looked at decoding GMDSS/DSC signals using Multipsk (Refs.1/3). Recently I have been able to use my balcony again and receive HF & VHF signals. This evening I was able to receive a VHF Ch70 GMDSS/DSC coastal signal on 2m using SDR# & Multipsk. GMDSS/DSC VHF Reception Parameter MF/HF VHF Frequency… Continue reading RTL-SDR for VHF Marine GMDSS/DSC

Introduction In a previous post I looked at decoding GMDSS/DSC signals using Multipsk (Ref.1). Recently I have been able to use my balcony again and receive HF signals. This evening I was able to receive a GMDSS/DSC coastal signal on 36m using SDR# & Multipsk. GMDSS/DSC HF Reception Parameter MF/HF VHF Frequency 2187.5, 4207.5, 6312.0,… Continue reading RTL-SDR for HF Marine GMDSS/DSC

Introduction Recently my apartment balcony reconstruction was finished and I was itching to use my L band dish again. I read in a newsgroup that the NOAA satellites have an L band transmitter, so I thought measuring the Doppler shift as the satellite comes into view and leaves would be an interesting experiment. Last year… Continue reading RTL-SDR for LEO L Band Doppler Shift