101–110 of 124 posts
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I would prefer we not have homemade cruise missiles all over the place. The people who need them can make them after all.
Sure, it's getting increasingly easier to just buy China made for ITAR-protected products. Night vision cameras, thermals, drones. They're fine, way more user friendly, often cheaper too.
They aren’t quite as good as US made ones yet, but it’s getting pretty close.
Regarding this "The suspiciously cheap $15 FPGA had equally suspiciously date and lot codes covered (white rectangles on the FPGA chip in the picture above). I have a development board of the same series chip with markings intact, so it definitely shouldn't look like this. It did end up working, but I wonder what the origin of these chips is." I spoke with a GoPro operations guy once, and asked how you can get the ch…
Chinese consumer electronics companies simply do not put huge margins on stuff. Here a great example, a $45 AlienTek DP100 100W USB-C micro lab power supply https://www.youtube.com/watch?v=Pd6LG7iP2GQ something like this would cost $500 with Digilent logo.
>speced to work 6 months on avg not 6 years
while original gopros suffer above average defect rates and cant record at 4K without baking itself to death/random shutdowns.
I remember this article from the same site a while back - https://hforsten.com/heartbeat-detection-with-radar.html I bought some cheap 10ghz and 24ghz dopper radar units off of amazon and started tinkering with them. You can absolutely pick up heartbeats and breathing just visually in the spectrogram. Here's a few samples from that era: 10ghz pointed at ceiling fan: https://www.youtube.com/watch?v=tIiFvByf1CQ 10ghz p…
interesting does/can it work behind structures? is it safe to point this at yourself?
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Plus the test and validation equipment which are $$$
I actually didn't use any expensive test equipment, only oscilloscope and multimeter. Even design and simulation software was all open source. Expensive signal analyzer or spectrum analyzer would have been useful, but they aren't absolutely necessary. It's possible to use the radar itself for many tests and debugging. I have tried to limit the projects I do on my own to only the equipment that I have home and open so…
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Thank you for the link! I totally forgot about kraken. I cloned their repo in November 2022, probably in anticipation of the ITAR hiccup. Hopefully the radar code is there.
I’d be interested in knowing if you’ve got that. I was going to buy one but the pull of the code put that on ice. I may pull the trigger if I can get the code!
If you're an American national, you're likely asking the OP to commit s federal crime.
ITAR's a mother.
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There is this: https://www.crowdsupply.com/krakenrf/krakensdr (Although they had to take the radar elements out of the firmware/software, most likely due to ITAR - ref link: https://forum.krakenrf.com/t/where-has-the-passive-radar-cod... )
if they really wanted to, they could make this a first amendment case, no?
This is great. It’s the last piece I needed for my suburban missile guidance system! This will be the last year the Joneses survive the annual block party. Can you do phased array radars next? I need the extra precision. There’s a few neighbors who don’t clean up after their dogs…
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There’s no risk of cancer from heating up tissue.
I did some reading and it seems you are right. No Idea why phones come with a SAR rating then and why there are safe limits defined, when no one found unsafe limits.
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I’m honestly not sure what the difference is. I kind of understand SISO, MIMO, and beam steering concepts, but just the basics from nerding out on my Starlink dish. This is what I’m talking about: https://www.twz.com/f-35-will-get-new-radar-under-massive-up... Specifically this image: https://www.twz.com/uploads/2023/01/03/20065813381381024.jpg I don’t know how targeting works, but with this level of resolution, I th…
Yes, that looks like regular SAR imagery. Checkout @umbraspace if you want to see some really nice SAR images captured by satellites launched along starlink satellites. https://twitter.com/umbraspace