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
Category: Navigation
Navigation: Celestial, Sextant, Equipment
VHF Marine GMDSS/DSC Decode & Scicos Simulation
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
RTL-SDR for VHF Marine GMDSS/DSC
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
RTL-SDR for HF 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
RTL-SDR for LEO L Band Doppler Shift
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