I downloaded Fusion360 this afternoon and decided to try to create a CAD model of the DF9IC heatspreaders I make. Here is the CAD version, then the real thing. Fusion360 is a fantastic piece of software and it is free for hobbyists.

The RSGB have now published my talk on their Youtube channel. Click here to view it.

The source of the presentation can be downloaded here G4DBN FT8 Talk RSGB 2018