i dont understand how are you able to detect things?
@coxfuture
Ай бұрын
this video is fascinating, i had no idea this was even possible. If you can pick up micro doppler returns off a propeller, I bet you could also pick up Jet Engine Modulation from a large enough jet
@anthonykot
2 ай бұрын
Get yourself a girlfriend lad..
@mrsiborg
2 ай бұрын
I'm guessing this video is aimed at people who are 'in the know' :(
@30hoursdev
2 ай бұрын
Apologies and definitely not the intent - more than happy to take questions here or on Discord!
@bunberrier
2 ай бұрын
You sir have forgotten more about RF than I will ever know. That's seriously impressive. If an employer asks for your resume show them this video. Thanks for the tour.
@TomHlavac
2 ай бұрын
Fantastic project - very cool.
@TomHlavac
2 ай бұрын
Someone please evolve this project to HF for OTH detections :)
@30hoursdev
2 ай бұрын
It could work as is in theory. Provided there is a strong HF source, and the reference and surveillance antennas support the HF frequency of choice. Just need to change the config file to the correct bandwidth and center frequency.
@daigakunobaku273
2 ай бұрын
Your paranoid old neighbor: THIS GUY IS SPYING ON ME WITH HIS ANTENNAS! You:
@timochyfilix5176
2 ай бұрын
Can this detect drones?
@eclipse2966
3 ай бұрын
In before NATO shuts you down for having a passive multistatic radar system that can detect stealth aircraft...
@nabicx
3 ай бұрын
I wake up, all veggies no eggs I hit the gym, all chest no legs
@ipaqmaster
3 ай бұрын
Awesome work
@alt8620
3 ай бұрын
now, how to make an active radar capable of tracking (low) flying aircraft
@Lucas-nu4du
3 ай бұрын
This could be a nice counter to anti-radar missiles: Using homemade radars as decoys.
@muffinpoots
3 ай бұрын
beautiful setup and video. ...gas char chubes
@glasstuna
3 ай бұрын
If you ever get lots of orange without any green its time to hide.
@wiley-harris-anderson
3 ай бұрын
Me: "Mom, I want passive radar" Mom: "We have passive radar at home" Passive radar at home:
@Darek-dt3hq
3 ай бұрын
Nice, did a FM-radio PCL system some 20 years ago. At that time, the SDR technology was not as good as now. Not mention the CPU speed 😁 ....
@Ulim151
3 ай бұрын
You might want to shield the nylon bolts because those sure arent resistant to UV long term. Maybe a black nonconductive paint?
@30hoursdev
3 ай бұрын
Fair call, it will degrade over time. I want to change the nylon bolts to stainless steel, then space out a 3D printed plate so the bolt doesn’t touch the boom.
@sbreheny
3 ай бұрын
Awesome! Do you have a ground rod near the antenna interface box?
@30hoursdev
3 ай бұрын
I do. Not shown but a meter away from the antenna interface box is the house ground rod. I still haven’t run a cable connecting the body of the box to ground, but will soon.
@sbreheny
3 ай бұрын
@@30hoursdev I would not use a common rod for both because of the voltage which would be developed across the rod and its connections in a lightning strike. It would be much better to have a separate rod and then connect from box to its own rod and from that rod to the building ground system.
@30hoursdev
3 ай бұрын
@@sbreheny I thought I could introduce a ground loop by having 2 ground rods, is that possible? But I’m definitely not an expert in that.
@0MoTheG
3 ай бұрын
Why the Yagi antenna? Where is it pointed? Wouldn't it be best to have an antenna that doesn't receive the radio station but is mostly omnidirectional?
@30hoursdev
3 ай бұрын
The 13 dB of gain from this Yagi help to increase the target signal in the direction it’s pointed. In my case it’s pointed along the aircraft landing path. In general one may make use an array of antennas to get the benefits of high gain as well as maximal coverage.
@0MoTheG
3 ай бұрын
@@30hoursdevAh, thx.
@spekenbonen72
3 ай бұрын
Cool. I didn't know there was such a thing as passive radar (and initially I was going to question this video. But some quick reading before posting saved me from the embarrassment). Very informative!
@n8lbv
2 ай бұрын
It's not truly "passive" there is an active component to this being transmitted at 204.64MHz.
@n8lbv
2 ай бұрын
Also not that it matters too much in this application, but a gamma match at that antenna feedpoint is an option to match that feed line to that lower impedance.
@VCLegos
3 ай бұрын
What are some resources to understand this video? I am deeply interested this topic but have next to zero knowledge on the subject. Thanks for any assistance.
@30hoursdev
3 ай бұрын
Lots of radar theory online and in textbooks. However I would recommend getting your hands dirty playing with signals first. Buy a RTL-SDR to record RF samples, and use GNU Radio to try and demodulate FM radio (lots of other videos showing this). I’m also (slowly) adding challenges in a signal processing CTF at learn.30hours.dev which can be solved in Python, MATLAB or the language of your choice.
@mrwanderlive
3 ай бұрын
Very impressive work. I love how neat and orderly everything is
@HansVanIngelgom
3 ай бұрын
Really nice and clean setup. Love it!
@fubar5884
3 ай бұрын
Now if we simply had some type of long, tube shaped thingy that could somehow be made strong enough to contain a small explosion. You could try to use that explosion to accelerate something. Maybe you could use a slightly smaller tube shaped thingy and have the explosion force it down the length of the larger tube to pick up kinetic energy. You could then in theory used this new contraption to try and send your tube shaped packages toward the blips and boops on your new radar. Meh, who are we kidding, that's sci-fi talk. Maybe one day we'll get there.
@renelaplanche7201
3 ай бұрын
Star trek teleport on peut rêver 😂
@schmip
3 ай бұрын
incredible work
@kennethschultz6465
3 ай бұрын
NO BETA MATCH??? WHY DOE´S ALL THE SUPPOSED KZitem WONDERS NOT MAKE A PROPER BUILD... OOOH I KNOW THEY WATCHED A FREAKING WRONG KZitem VIDEO...
@30hoursdev
3 ай бұрын
The Yagi has a VSWR of 1.7 and it’s receive only. My mismatch loss is much much less than my cable loss from 15 m of RG-58.
@kennethschultz6465
3 ай бұрын
@@30hoursdev hey bro.. f the SWR.. the beta match is for making RX /(tx) from A-SYMMETRIC TO SYMMETRIC .. using a halfway with a gamma match had eliminated the asymmetric vs symmetric .. not that SWR ain´t important but it would have same SWR with the Match don right .. i often wonder why ppl on youtube always leeve out the betamatch .. making the antenna work on both side not only on the RX or TX side (radiator and tx side) doe´s it make sense that you dont utilize the shielded / grounded side until the betamatch is applied.. just saying .. it is you´r antenna.. but if you put it truh a smith diagram on a rotor .. you would see the antenna with out betamatch is asymmetric not symmetric in tx .. or rx .. Rothammel ARRL Jessup antenna books funny enough state the same... so i bet they are right...
@housemana
2 ай бұрын
@@kennethschultz6465 bro u are methed tf out lmao
@oldergeologist
3 ай бұрын
I am glad there are smart people like you who can makeup for people like me.
@ryanreedgibson
3 ай бұрын
To be honest, I'm jealous of your setup but even more jealous that you're able to get on your roof this time of year. After 102F I don't even go outside.
@LabiaLicker
3 ай бұрын
I'd love to hear your thoughts on the KrakenSDR (5*RX)
@30hoursdev
3 ай бұрын
Working on it. The 2x Rx Kraken is straightforward. The 5x Rx Kraken will be 4 channels for the surveillance array. I’m planning to rewrite the acquisition code (the Heimdall DAC that Kraken provides) before integrating in this code base.
@LabiaLicker
3 ай бұрын
@@30hoursdev Oh you have one?
@bruhmoment3741
3 ай бұрын
Tutorial when
@jacobburns9343
3 ай бұрын
What is the smallest object you are able to "see" with this passive setup?
@0MoTheG
3 ай бұрын
That would depend wouldn't it?
@dr.lexwinter8604
3 ай бұрын
Damn, you priced me out of the market when you showed the server side. My dreams of a passive radar ended when you said hackrf.
@dr.lexwinter8604
3 ай бұрын
I've noticed police just don't use ADS-B in Australia. This is an astonishingly unprofessional behaviour, worse perhaps even than their refusal to use normal radio insisting instead every constable be given a digital encrypted radio suite at taxpayer expense. I suspect these luxuries are because they do not want public oversight, which begs the question; what're they hiding? We all know the usual excuses they will have, but the bottom line is we pay for their service, all records are public, transmit in the clear and turn your transponder on ffs. Even the MILITARY are blasting on ADS-B just fine. But the police in Australia truly think they're the SAS or something. They sincerely need a speaking to by your citizenry and a reminder of whom they exist to serve.
@Girvo747
3 ай бұрын
That’s all Aussie cops for you. They think they’re above the rest of us, rather than serve us.
@whynotjustmyusername
3 ай бұрын
As a German I honestly can't understand the problem there. The information that police transmit is sensitive both for the individuals it is about as well as for themselves. Most matters that I would call the police for or might have the police called for on me would pertain to very much private matters. I wouldn't want some radio geek to listen in on them transmitting a report that contains my name, adress, date of birth and some recent, potentially quite intimate event. Just imagine that you were wrongfully suspected of having committed some serious crime or were even arrested for it - would you want the entirety of your friends and family and especially your employer to know? Even if it turned out to be nonsense quickly, you still would have a hard time shaking off the rumours that come afterwards. If you were the victim of a serious crime, would you want everyone and their dog to know? I wouldn't want the entire world to know if, say, I was the victim of a sexual crime. Next of course police do have an interest in keeping their conversations secret. There would be no use in setting up, say, speed cameras if everyone immediately knew where they are. Or it would be quite the unfair advantage, if a bank robber could listen in on police radio where officers try to coordinate their response. Those who do have a genuine and legitimate interest in getting police conversations should of course have the means to access them, e.g. through court orders in discovery, but I think police have a very good point in keeping their communication secret.
@Girvo747
2 ай бұрын
@@whynotjustmyusername It’s not conversations you peanut, it’s the location of their aircraft. It’s dangerous and silly that they don’t run transponders, while the RAAF happily does so above my city.
@rrai1999
9 күн бұрын
@@whynotjustmyusername They are public servants responding to public events, in public. Nothing about their actions should be hidden, except in extreme case, like attacks by organizations. I wouldn't want some German who thinks "radio geeks" shouldn't be able to listen to public servant communications making any decisions about this in my country, and I'm glad I don't have to deal with it.
@rrai1999
9 күн бұрын
@@whynotjustmyusername Speed Cameras are not allowed in many states.
@techtinkerin
3 ай бұрын
I can hear aircraft on my cb radio, they sound like a ripple that gets faster and slower as they approach and depart. First noticed this ages ago. Obviously someone has to be transmitting and actually bouncing the waves off the aeroplane whilst I listen. Im sure someone clever could turn 2 cb radios into a kind of radar based on this.😂
@spextahd5673
3 ай бұрын
"Mom, can we have Real time passive radar?"
@Lugeix
3 ай бұрын
Can this system be use for a "Hole in the Noise Detector", for detecting stealth? Since stealth absorb and or reflect radio and noise, can it detect where radio/noise should be, but is missing?
@0MoTheG
3 ай бұрын
No For that the aircraft needs to pass in-between the tx and rx.
@Ninjahat
3 ай бұрын
Nice work! This worked as ASMR for me 🙂Dunno why... maybe your pleasant voice 😄 5:15 Note; if the data on the ADS B exchange page is correct that is not a helicopter. PC12 is the Pilatus PC-12 single engine turboprop aircraft 😉
@ElijahSamsonWiltonChen
3 ай бұрын
gamer
@fluke196c
3 ай бұрын
Why use coax for 5vdc and not regular cable? Is there a benefit? If so, does the polarity matter?
@30hoursdev
3 ай бұрын
It was convenient since I already had the coaxial run done. It was neater to keep everything over coax rather than add new connectors to the antenna interface box. Polarity does matter, ground is connected to the cable bulkhead, so you don’t want 5V shorting out there. Keep the 5V on the inner conductor.
@nejcs56ne95
3 ай бұрын
How is it passive if it has a transmitter?
@0MoTheG
3 ай бұрын
He doesn't have one.
@rogerwilco2
3 ай бұрын
Very nice setup. Reminds me a lot of the things we do in radio astronomy.
@spookysammy7245
3 ай бұрын
I sense a retired techie. But the lack of proper weatherproofing of the exterior connectors leads me to conclude not from the Navy. Air Force?
@hurbs
4 ай бұрын
Now build an AESA Radar array 😅😅
@shaneclark5022
4 ай бұрын
NERD!
@scullyy
4 ай бұрын
so this is blah2. what's blah1? A nuclear reactor?
@harrybond007
4 ай бұрын
Wow 1 video and 1.8K subs already!
@take3077
4 ай бұрын
As a grocery store manager I am glad to learn this
Пікірлер