Scytale-C “how to” videos: Rx Inmarsat-C STD-C and messages using open-source software (and even no receiver)
December 28, 2020Some time ago I have recorded a few you tube videos of how to set up Scytale-C to receive Inmarsat-C STD-C and messages. Here are the links:
Nooelec Iridium Patch Antenna
Pre-alpha
As I cannot find a better title for this very first release of the SDR# Scytale-C Decoder plugin. The source code will follow in its own repo after I’ll attach all the licensing terms and perform a mandatory cleanup. A few…
Transfer function to C# filter coefficients breakthrough
I was able today to convert the loop and the VCO filter from transfer functions to filter coefficients. Took some good weeks to get here, nonetheless this is now done and the next step would be to integrate the new…
Transfer function to FIR hiccup, help!
About half a year a go I found an excellent book on Costas: https://www.springer.com/gp/book/9783319720074. There are three models of Costas loops for BPSK presented in the book, in-detail explanation of the static and dynamic analysis and mathematical models: conventional circuit on…
French Guiana Firing Exercise or GNURadio and ScytaleC Inmarsat-C decoder
This is what we’re going to build. And this is what we’re going to receive: LES21 Marlink 10.10.107.29 10-MAR-2018 01:08:16 255880AVURNAV CAYENNE 003/18 FRENCH GUIANA FIRING EXERCISE FROM 291500UTC JAN 18 TO 020100UTC FEV 18 IN AREA ESTABLISHED WITHIN 15NM…
Have a graph!
Some not long time ago, gcndevelopment released a bundle of binaries for x64 Windows 10 at http://www.gcndevelopment.com/gnuradio/downloads.htm, and this created a great opportunity to play with GNURadio from a native Windows environment perspective. I always had doubts regarding the quality of…
IQ out!
Things are starting to get shape. The first obstacle was how to get anything out of the SDR#, where to start with the plugin?! Grace to the examples on the SDR# page and thanks to Vasili who kindly shared his source…
Another idea
This describes a possible multi decoder solution based on: http://aaronscher.com/wireless_com_SDR/RTL_SDR_AM_spectrum_demod.html Identify the frequencies we want to capture. Our LES’ signal has a 4 kHz frequency band and we aim to capture more than one of these frequency bands at the…
Beginning of a plan
This is a rough idea of how I think the extension plugin could look like. The interface follows Scytale-C and the Meteor plugin interface from http://www.rtl-sdr.ru/page/komplekt-plaginov-dlja-priema-sputnikov. The LES is selectable from the Frequency manager (otti’s idea). The displayed frequency is the…
Something new
The idea is to code an SDR# plugin decoder for Inmarsat-C. Will see how it goes. IQ input Soft bits Multiple instance, each one running on its own frequency band Each one will have its own settings (many defaulted) Should display…