Additional HAM Radio Resources

Here you will find an update with additional HAM radio resources, continuing with the Down the Rabbit Hole research series which provides starting points on various relevant topics catering to autodidacts who strive to challenge themselves with new or extended knowledge and/or skill sets.

You can find the other parts of the series here: 

8.1: HAM Radio 101: A Collection of Resources for HAM Radio Beginners
8.2: HAM Radio: Additional Resources for Beginners