Inductance and Stuff

• Dave did a teardown of a plane transponder, so we talk a bit about RF (without much knowledge)
• There is a PIC16C84 on board
• Learning or relearning
• Transmits 1030 MHz, receives 1090 MHz, 140W
• We'll ask Jeff Keyzer on the upcoming Keyzermas
• Crystal radio is basically a pin diode with long antenna.
• Dodgy wiring on 3.5kW aircon
• Coefficient of performance
• Dishy (Starlink) teardown. Discussed briefly when Joris Aerts (518) was on the show.
• Which PCB software is the best? Question posed by past guest Robert Ferenec.
• 100 Photos vs 1 Photo anecdote
• Greg Davill is doing an "Advent for circuit boards". This had been done by Alan Yates for circuits back in 2014.
• This is also a thing for learning code, called Advent of Code. These are all based around Christmas traditions (advent calendars)
• Chris figured he'll be doing a lot of firmware this winter and asked for advice on Twitter about it.
• Bunnie wrote an interesting article about the PCB for the Precursor phone (?) Involves past guests
  • Bunnie
  • Xobs and Mithro
• The Arecibo Telescope has failed and is down for good. The final blow may have been a small earthquake. There are multiple views.
• Dave and Chris pretty much agree on the Hyperloop
• Train bridge construction in China. That was not from @MachinePix (by Kane Hsieh) but there are lots of great onese if you follow.
• Parts
• Chris is thinking about trying out the CM4. Not mentioned on the show, but Timon did a copper clad PCB breakout for it and it worked great.
• High speed signal guide from TI
• High speed getting more common? When Jay Carlson was on the show, he mentioned his intern doing a DDR3 layout easily.

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