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by mmaunder 18 days ago
Historically these have been quickly shut down without much of an explanation.
5 comments

Please elaborate. There are literary step-by-step videos on how to build these. E.g. https://www.youtube.com/watch?v=g3LT_b6K0Mc
Phased array radars are export controlled in the US. It doesnt mean its illegal to build or own, but it might be illegal to sell in some cases
I thought I remembered even seeing public Git repos with passive radar code that ended up getting shut down due to export controls?
Yeah, Kraken SDR removed some functionality due to these concerns, if I remember correctly.

Odd, because export controls don't generally apply to published material (like open source software), but maybe they were worried that because they were also selling the hardware they could have issues due to the combo being export controlled.

Ah, found discussion of what exactly it was they pulled, it was the passive radar code: https://www.reddit.com/r/RTLSDR/comments/yu9rei/krakenrf_pul...

And indeed, they confirmed that they believe the open source software should be OK, but they had concerns because they also sell the compatible hardware: https://nitter.net/rtlsdrblog/status/1591657740229046274

As someone who works daily with export-control-adjacent hardware and software, my experience is that people tend to aggressively self-censor to a far higher standard than export control regulations actually require. The perceived headache of drawing the ire of whoever it is the enforces this stuff (which as I type this comment I'm just realizing I don't know who specifically is responsible for that) is so scary that people don't want to take any risk at all of being targeted.
If you don't self censor in these cases the law will find you somehow. How change so they get you next time.

Not always, but pgp wasn't exported that way until not long before there was good demand for for encryption in e-commerce anyway

Wonder which LLM would be happy to vibe code it back (not sure if it would be able to pull it off tho).
This is not a radar, only a receiver.
It can still be in scope:

> Direction finding equipment for determining bearings to specific electromagnetic sources or terrain characteristics specially designed for defense articles in paragraph (a)(1) of USML Category IV or paragraphs (a)(5), (a)(6), or (a)

ITAR part 121.

The "specifically designed for defense" probably makes this OK, but IANAL.

The covered materials are very broad, though often limited to equipment built "for purposes of", like in this section.

Title 22 Chapter I Subchapter M Part 121 - The United States Munitions List - Category XI Paragraph b

Electronic systems, equipment or software, not elsewhere enumerated in this subchapter, specially designed for intelligence purposes that collect, survey, monitor, or exploit, or analyze and produce information from, the electromagnetic spectrum (regardless of transmission medium), or for counteracting such activities.

At what point does a microphone become an intelligence device, when we have so many types of microphones. Is it an arbitrary label I can add or remove to a product? Will it apply equally to large manufacturers?
It's a matter of intent, which will ultimately be litigated in court and is going to depend on a lot of surrounding factors.
> specifically designed to collect or analyze information from the electromagnetic spectrum

Wouldn't that apply to every spectrum analyzer?

Where did your quote come from? The comment you're replying to says "specially designed for intelligence purposes". The word "specifically" doesn't appear.
Probably because the people working on them get job offers that come with clauses about not working on this stuff publicly.
Do share some more details please
The explanation may be spelled ITAR.