DSP and SDR
DSP and SDR are very important for de hamradio operator. Different from analog technology, where one can see the components that define a radio, is SDR mostly a few chips with a lot of math calculations. Ofcourse, there’s still some analog hardware near the anntenna and the loudspreaker and microphone but that does not fully define the radio.
For a starter here’s a presentation with an intro to DSP and SDR for a radio club to get some grips on those SDR’s that everybody is using. Very littele math because most of the audience will leave the room.
DSP en SDR voor de radioamateur
(Picture below: Software Defined Radio: Basic Principles and Applications, by José Raúl Machado Fernández.)