I remember looking into SDR when I was a student, really amazing what you can pull down for the price of a dinner these days.

I know that you can get the same pictures from the internet but building something like this and seeing how all the pieces fit together is extremely cool.

Also an extremely cool project to do with kids, the output is visual but it's such a cool combination of hardware, software, some light math (to design the attena) and crafting (to build it).

If this spiked your interest... take a look at https://satnogs.org

This article is a few years old now. Unfortunately the NOAA satellites stopped transmitting APT last year.

I don't know if there are any others. I do remember picking it up with a suitably-programmed VHF receiver in the early 2000s with a distinct "tick - tock - tick - tock" sync pulse on every line.

Is it just me, or does it feel like there's half an article missing? They talk about a PVC pipe, drop a couple pictures and thats it...