QuadRF can spot drones and see WiFi through my wall

Post by hinkley » Sun, Jul 12, 2026, 12:38 AM UTC

a_paddy wrote: post #103

hinkley wrote: post #85

Earlier quoted context omitted.

The army has one of these for sniper triangulation, and Boeing made a civilian version for optimizing sound dampening on the 787. I don’t know if they kept doing that on subsequent planes but I would expect so given how enthusiastic they were about being able to apply the weight budget to greater effect. You need really high clock rate sensing to differentiate the arrival time for sound from microphone arrays where t…

Given that it was McDonnell Douglas, sorry Boeing, they probably cut it.

Post by m463 » Sun, Jul 12, 2026, 2:28 AM UTC

greggsy wrote: post #227

thomashabets2 wrote: post #113

Earlier quoted context omitted.

If you own your home I'd say you need a thermal imager. Just the ability to diagnose clogged pipes is priceless. https://x.com/ThermoInstagram/status/909356506059026432 Also for checking if microwaved food is ready.

+1 to thermal imager. I use mine to locate hot wires, heating and cooling gaps in the roof and around windows, car maintenance, the pizza oven, and its even sensitive enough to ‘see’ studs in the wall. Priceless on one occasion for finding leaks in the ceiling, which are notoriously hard to pinpoint.

Post by rtkwe » Sun, Jul 12, 2026, 8:09 PM UTC

Wingman4l7 wrote: post #75

mschuster91 wrote: post #60

Earlier quoted context omitted.

The Pi alone... just today, someone over at Reddit spotted a Pi 5 being sold for 350$ [1]. [1] https://www.reddit.com/r/homelab/comments/1uso8u1/insanity/

Just like eBay, an Amazon listing for a certain price does not mean the item is actually /selling/ for that price -- especially with badly-coded dynamic re-pricing algorithms hooked into listings these days.

Post by aeturnum » Mon, Jul 13, 2026, 3:40 PM UTC

miranaproarrow wrote: post #35

aeturnum wrote: post #13

Neat! SDRs have been available at reasonable price points for some time but the processing power to engage with wifi and other digital signals has been somewhat elusive. Assuming RAM can be purchased in the future, I think we might see a lot more prosumer-targeted devices for doing raw signal analysis in the future.

Do you have specific SDR in mind? I thought the v2 dongle doesnt have the range of Wifi? SDR is something Ive just recently want to learn to help me understand electromagnetism

Post by mrtnmcc » Wed, Jul 15, 2026, 3:23 PM UTC

Eisenstein wrote: post #223

mallets wrote: post #130

Earlier quoted context omitted.

The really intriguing part is the "Custom ADC" here, seems like some kind of 1-bit ΣΔ oversampling ADC (704 MSPS?). Single differential transistor, and captured by FPGAs LVDS RX. Neat way to reduce cost and pin-count? But I think the typical FPGA clock tree has poor jitter performance. Not using the internal PLL(s) might help with spurs but the clock buffers are unavoidable. The documentation mentions it's likely fur…

For those confused about what this means, my understanding is this: when quantizing a wave you can use sampling rate to derive missing bits, so using even one bit can work if you do it fast enough, but jitter is a problem because it means the clock doesn't cleanly sync and it doesn't help non-quantization noise like those generated from switching supplies. Corrections welcome.