Ham Radio University {HRU}  are now on line you can see their 14 informational presentations by local experts in a broad range of Amateur Radio activities including: Amateur Radio Emergency Communications; Basics of HF Operating; Communicating Through Amateur Radio Earth Satellites; Remote Station Operating Over the Internet; Software Defined Radios; HF and UHF Digital Communications; and Using RaspberryPi Computers in Amateur Radio.

You can find there there presentations from Jan 9th listed below.
You-Tube Videos: https://www.youtube.com/c/HamRadioUniversityNLI
Presentations Papers: http://hamradiouniversity.org/past-presentations/  

Check out their homepage: http://hamradiouniversity.org/