Every year, the QRP Amateur Radio Club International hosts a QRP conference called Four Days in May (FDIM) in the United States. This year (2018), Hans Summers G0UPL of QRP-LABS made a presentation titled "Modern QRP Rigs and the Development of the QCX CW Transceiver kit".
He introduced three main themes, all based around use of the QCX CW transceiver as an example of a practical implementation and which he describes as follows :
Better architectures than the SA602 -> crystal filter -> SA602 superhet which I am calling the "cold war sandwich", since it has been around since the 1980's and heavily copied by amateurs ever since
Modern oscillators, in particular the Si5351A, which make it easy and cheap to make a crystal-locked flexible and precise oscillator
Use of microcontrollers in your projects.
The slides for the presentation are here... http://qrp-labs.com/images/news/dayton2018/seminar.pdf
The audio of the presentation can be found on the Ham Radio Workbench website.... https://www.hamradioworkbench.com/podcast/2018-qrp-arci-fdim-hans-summers-g0upl-and-dr-jack-purdum-w8tee
Listen to the podcast from 1h 20m to 2h 02m and refer to the slides during the talk.
The full 41 pages of the FDIM conference proceedings booklet from Hans Summers can be viewed here... http://qrp-labs.com/images/news/dayton2018/fdim2018.pdf
Links...
1) http://www.qrp-labs.com
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