Would something like this work at much lower frequencies? Being able to see RF at 3-30MHz would be fantastic for hunting RFI in the amateur radio HF bands.
QuadRF can spot drones and see WiFi through my wall
221–230 of 249 posts
Re: QuadRF can spot drones and see WiFi through my wall
#222QuadRF creator here. Happy to answer questions! We have a quick demo video as well: https://m.youtube.com/watch?v=QvniJk3uNyA Along with a deeper dive video: https://m.youtube.com/watch?v=zdJ9Tbm8ALg We didn't give Jeff great direction on camera alignment calibration or setting the radio gain but he seemed to mostly figure it out. We're improving the UI based on his suggestions (it's open source so you can customize…
What distance of drone detection would this theoretically have?
I assume it depends mostly on what frequency and TX power the drone in question is using, as well as the RF environment you're operating in and the noise floor of the SDR
Re: QuadRF can spot drones and see WiFi through my wall
#223QuadRF creator here. Happy to answer questions! We have a quick demo video as well: https://m.youtube.com/watch?v=QvniJk3uNyA Along with a deeper dive video: https://m.youtube.com/watch?v=zdJ9Tbm8ALg We didn't give Jeff great direction on camera alignment calibration or setting the radio gain but he seemed to mostly figure it out. We're improving the UI based on his suggestions (it's open source so you can customize…
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.
Re: QuadRF can spot drones and see WiFi through my wall
#224Earlier quoted context omitted.
Are you concerned about the issue that KrakenRF ran into with their passive radar demo project violating ITAR rules, or is that something that can easily be avoided by just not doing that specific kind of application?
We don't support passive or active radar beyond basic near-field sensing. We also proactively submitted a detailed report to the State Department earlier this year showing we don't exceed any of the USML criteria for ITAR controls. Separately we have an ECCN determination under EAR. This does rule us out from exporting to a few places (Cuba, Iran, Russia, North Korea, Syria, and some regions of Ukraine). But we are a…
> does rule out..... some regions of Ukraine
The occupied ones, presumably. But why is Ukraine broken up? Surely, you will be dealing with a government, and they'll know what to do/ where there current borders are.
Re: QuadRF can spot drones and see WiFi through my wall
#225Funny, in the "imagine what governments are capable of" vein, I just read this[0] a few minutes ago before coming over to HN to find this post trending. [0] https://www.prnewswire.com/news-releases/the-future-takes-fl...
Yep, been in the works for a while. Ericsson, Nokia Bell Labs and Qualcomm have been publishing press releases regarding ISAC and telecom providers also sees new potential market of S2aaS, especially if there is a push towards autonomous robots, vehicles that need the data for mapping & training data. Future networks using millimeter-wave (mmWave) and sub-terahertz (THz) frequencies may collect or infer detailed info…
Seems like a contender for the tricorder prize that was announced ten or so years ago might not be too far off.
Re: QuadRF can spot drones and see WiFi through my wall
#226Funny, in the "imagine what governments are capable of" vein, I just read this[0] a few minutes ago before coming over to HN to find this post trending. [0] https://www.prnewswire.com/news-releases/the-future-takes-fl...
Remember how for years starting in the late teens and fizzling out over covid university paper after university paper about "this is so cool look how we can see through walls by essentially using 5g and wifi as ambient light" and they steadily marched up the chain from simple room layouts to furniture layouts, occupant detection, occupant movement and then started being dressed up with the usual dogwhistle language a…
I stopped reading halfway through in frustration and then saw your apology.
You only need to apologise to yourself really.
Re: QuadRF can spot drones and see WiFi through my wall
#227Earlier quoted context omitted.
interesting on amazon: fluke $25k flir $10k td2 $1k These are the kinds of things you look at and think - maybe I DO need night-vision, or a soldering iron with a cpu, or a thermal imager, or a steerable endoscope or now an acoustic imager....
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.
Re: QuadRF can spot drones and see WiFi through my wall
#228One day I want to build something like this, except for sound. It would be great to get a heading and distance for where a sound is coming from. This could be both for small scale things (e.g. which part of this is squeaking?) or large scale (e.g. is that booming noise coming from the construction a few blocks away?)
I want that but for smell.
Nobody can do that. Use dogs.
Re: QuadRF can spot drones and see WiFi through my wall
#229Earlier quoted context omitted.
Has anyone tried acoustic imaging for water leaks inside walls? I live in a multi-floor 1900s Victorian. A leak can affect several units, and tracing the source can mean opening walls or floors in multiple places, and coordinating access has been getting harder with less WFH. Could one of these tools help map water pipe routes and trace a leak, or are they only going to be useful for air and gas leaks?
WArning I am not an expert There is a man call leak detective, who hunts for leaks in the UK. one tool he has is shutting off the water and filling the pipes with gas and using either sound or gas detector to pin down leaks. A lot of the time he just listens though.
Up until the 90’s airline in flight entertainment use stethoscope style earphones. My dad used to steal them for his workshop as a way to hear for leaks in various parts.
Our ears and eyes are very high bandwidth sensors.
Re: QuadRF can spot drones and see WiFi through my wall
#230It should be more specific, it spots RC drones operated on ~5.8ghz, it won’t spot RC on 900mhz, nor cellular enabled ones.
I'm not super familiar with this area, but couldn't it see harmonics?