These two items from Microwaves&RF showed up in my inbox a couple of days ago:
What Does a Coaxial Cable Look Like? (2014)
Coaxial cables are one of the most common interconnection solutions for RF/Microwave/Millimeter-wave devices. Transverse-electromagnetic (TEM) mode waves are conducted through a coaxial cable with very low loss compared to free-wave radiation, and are resistant to outside signal interference.Read more »
Basics of Modulation and Demodulation (2017)
Radio waves can carry audio, video, and digital information over great distances by using changes in a carrier wave’s amplitude, frequency, or phase to represent the information being transmitted. Read more »
I suspect that most hams will find these interesting.