https://15ec755svit.blogspot.com/2018/11/module-4-communication-satellites.html
https://15ec755svit.blogspot.com/2018/11/module-5-remote-sensing-satellites.html
https://15ec755svit.blogspot.com/2018/11/module-3-multiple-access-techniques-and.html
https://15ec755svit.blogspot.com/2018/10/module-2-satellite-subsystem-and-earth.html
https://15ec755svit.blogspot.com/2018/09/module-1-satellite-orbits-and.html