A single radio can be quickly located. A cluster of radios on the same frequency is much more difficult because you need to be able to isolate the different radios and track each one by one. Not impossible, just requires a bit more effort.
Well just need to write a plug-in to time send. Say turn on and send for 5mins each hour on an overlap with each node, but offset the times each hour based on maybe a static setting. It wouldn’t be full proof, but would make it more annoying to find.
Keysight has been doing something like this for about 20 yrs except there are not 5 receivers in a single box, but multiple receivers that can be synchronized together via GPS and ethernet. It uses the same principle call time distance of arrival or TDA. Think of it as a big array of receivers that all report to a PC to analyze the data and report back the direction of the signal and approximate location. I’m surprised no one hasn’t done this before using SDR dongles or HackRF modules. All that needs to be done is to make the LOs and clock on the digitizer’s coherent to a GPS standard.
Someone has made a good COT converter for ATAK which works well. I've fed it into a tak server and distributed the output so others can see the direction and location of an RF source. Plenty of room for improvement but for a small price, it's a fairly good capability
This Should Be Made In Some Sort of Sport Where You Need To Track Down Transmitters For SOme Prices Or Products :) It Would Be Pretty Cool To bring Together People With This Interest !
A lot of ham radio clubs do this and call it "fox hunting". They'll do it at a lot of ham fest around here. Definitely look into some of the ham radio groups in your area and see if they do any fox hunting and join in on the fun! Even if you don't have a ham radio license, you can join in since this activity doesn't require any transmitting.
Cool new topic, hardware expensive but hey that’s how professional equipment goes lol. So it’s trying to micro triangulate with those 5 inputs, and then outputting to the user more like a compass/wayfinder. Nice that’s it’s more direct than having to drive in a circle around the target while taking radio measurements to triangulate lol
It doesn't "micro triangulate". It determines the bearing based on the phase difference of the received signals. That just gives one bearing. The bearing alone doesn't tell you where the transmitter is. You have to take multiple bearings along a baseline that isn't in the same direction as the target in order to get bearing shift. That shift is what allows you to locate the transmitter. This is how triangulation works in any bearing determining DF system.
@@poland153 Circling isn't required or even desirable. All that is needed is a baseline down one side of the target long enough to swing the bearing significantly farther than the average bearing error plus the minimum bearing resolution so the solution will converge with the desired accuracy.
I want one of these so bad! I wish there was a way to use offline mapping to make it a truly offline tracking solution. I know that you can just use the lobes as you demonstrated.
do not know much about sdr, but wonder is it possible to find fpv drone pilot, and even, is it possible to find location the drone itself? and if somebody has the same device, can this device find location of your device?
Finding the drone pilot should be a bit easier than the drone. If the drone is transmitting location data in clear-text, that data could be intercepted. As far as locating the same device, assuming you're talking about SDR, that is not possible with most SDRs as they receive signals only and don't transmit.
I googled this because I was thinking you could probably engineer a passive Radar array that just listens for radio signals. So far I've found this and a ww2 area oscilloscope thing called a hfdf But yeah, that pretty much confirms my suspicion. I'll bet the military has something like this with a gazillion antennas that could track and classify multiple radar sources. And if not.... Then what am I paying so much in taxes for?
The military will generally just use active radar unless they're worried about being detected. The problem with passive radar is it relies on radio signals from others like TV or AM/FM radio so if you're operating in an area with no radio signals, it won't work. There is this device for military use that is similar to what you're talking about though ruclips.net/video/ez7chMwwMSk/видео.htmlsi=nAsTO3Wj8MPqfgXh
There are much cheaper and simpler ways. Just use a beam antenna for vhf and higher, or a loop on HF. Any directional antenna will give you a direction toward the transmitter.
@@The_Comms_Channel As a fox hunter with decades of experience using many different DF systems I think I can challenge that assertion. I notice you just assumed one of the towers was the transmitter, and you didn't determine which one of them was actually transmitting. The Kraken system isn't much different from doppler DF systems we've been using since the 80s.
Yes, this wont pinpoint exactly which tower, but you're not going to find the general location of a signal miles away within a few minutes like this will. As mentioned earlier in the video, we'll be covering the traditional methods where we'll use attenuators, harmonics to narrow down a signals location once we get to the general location of it.
I can't wait for the Meshtastic direction finding tests. I have been told many times by people that they could find my Meshtastic radio in minutes.
Do they know meahtastic radios operate in common frequencies that they'll have to sift through?
@@kerbalairforce8802probably not 😂
A single radio can be quickly located.
A cluster of radios on the same frequency is much more difficult because you need to be able to isolate the different radios and track each one by one. Not impossible, just requires a bit more effort.
People on the Internet love to run their mouths 😂 We'll be putting it to the test though!
Well just need to write a plug-in to time send. Say turn on and send for 5mins each hour on an overlap with each node, but offset the times each hour based on maybe a static setting. It wouldn’t be full proof, but would make it more annoying to find.
I certainly don't need a Kraken but I definitely want one!
It's been a lot of fun!
Diddo!!!
Absolute mood (nor can I afford one >.
Definitely not the cheapest option in the world, but we'll be covering more affordable options in the series 🤙
Super excited for this series. Direction finding is just so interesting!
It really is! More to come soon!
Best voice on an ATIS I’ve heard in the US. All the rest have been way too fast.
Great video, many thanks.
Sure thing! We have some great controllers here.
I was going to say the same thing. I could clearly hear it and understand it. Best one so far
Very nice. I have seen several videos on the Kraken system before but this is a nice short summery of how it works.
Thanks! More to come as we'll go after some progressively harder targets.
I do think the KrakenSDR is a very useful tool and i look forward to seeing you do more with it.
More to come soon!
I'm looking for new RDF tools for our search and rescue team. KrakenSDR looks really promising, (I was tinkering w/ KerberosSDR previously.)
Keysight has been doing something like this for about 20 yrs except there are not 5 receivers in a single box, but multiple receivers that can be synchronized together via GPS and ethernet. It uses the same principle call time distance of arrival or TDA. Think of it as a big array of receivers that all report to a PC to analyze the data and report back the direction of the signal and approximate location. I’m surprised no one hasn’t done this before using SDR dongles or HackRF modules. All that needs to be done is to make the LOs and clock on the digitizer’s coherent to a GPS standard.
Just think how useful this might be for identifying jamming signals on ham radio.
Might be more doable now that the software is there.
5 years ago SignalsEverywhere put this on RUclips: Radio Direction Finding Equipment KerberosSDR Coherent 4 x RTL SDR RDF Setup
:ø)
And there are now kiwisdr web sdrs publicly available which you can use using the tdoa plugin to geolocate signals from 0-30mhz
This was very informative … thank you!
Sure thing! Thanks for watching!
Bro! Get out of my head I've been wondering about how to do RDF lately. Love it!!
🔮 more to come!
Someone has made a good COT converter for ATAK which works well. I've fed it into a tak server and distributed the output so others can see the direction and location of an RF source. Plenty of room for improvement but for a small price, it's a fairly good capability
That's awesome! Will have to check it out and see if there's anything I can contribute to the project.
You should totally try it with Dipoles tuned for FM band and use it to receive multiple stations on the same channel at the same time!
That would be an interesting experiment! I suspect when we get into testing Meshtastic signals it will be similar.
Hell yeah. Direction finding is one of the topics I was hoping for on this excelent channel.
More to come!
This Should Be Made In Some Sort of Sport Where You Need To Track Down Transmitters For SOme Prices Or Products :) It Would Be Pretty Cool To bring Together People With This Interest !
A lot of ham radio clubs do this and call it "fox hunting". They'll do it at a lot of ham fest around here. Definitely look into some of the ham radio groups in your area and see if they do any fox hunting and join in on the fun! Even if you don't have a ham radio license, you can join in since this activity doesn't require any transmitting.
Nice!
Definitely worth it to learn RDF and I look forward to more!
Thanks! More to come!
Cool new topic, hardware expensive but hey that’s how professional equipment goes lol.
So it’s trying to micro triangulate with those 5 inputs, and then outputting to the user more like a compass/wayfinder.
Nice that’s it’s more direct than having to drive in a circle around the target while taking radio measurements to triangulate lol
Haha, yep! This makes it a breeze, but at a price of course.
It doesn't "micro triangulate". It determines the bearing based on the phase difference of the received signals. That just gives one bearing. The bearing alone doesn't tell you where the transmitter is. You have to take multiple bearings along a baseline that isn't in the same direction as the target in order to get bearing shift. That shift is what allows you to locate the transmitter. This is how triangulation works in any bearing determining DF system.
@@stargazer7644 right, ideally you’d circle the target
@@poland153 Circling isn't required or even desirable. All that is needed is a baseline down one side of the target long enough to swing the bearing significantly farther than the average bearing error plus the minimum bearing resolution so the solution will converge with the desired accuracy.
Now i need one..
Dont know why, but i need it!
Haha, I said the same 😂
@@The_Comms_Channel
Do you get to keep the eval unit?
I want one of these so bad! I wish there was a way to use offline mapping to make it a truly offline tracking solution. I know that you can just use the lobes as you demonstrated.
Why
It's an awesome tool for sure! You can actually download the maps for offline use as well.
Really cool project, thanks 😊😊
Sure thing! Thanks for watching!
do not know much about sdr, but wonder is it possible to find fpv drone pilot, and even, is it possible to find location the drone itself? and if somebody has the same device, can this device find location of your device?
Finding the drone pilot should be a bit easier than the drone. If the drone is transmitting location data in clear-text, that data could be intercepted. As far as locating the same device, assuming you're talking about SDR, that is not possible with most SDRs as they receive signals only and don't transmit.
@@The_Comms_Channel thanks for answering
Sure thing!
…how about putting it on a drone/fixed wing
It would be a heavy payload so it would need to be a rather large aircraft
Will the software work with other hardware? Like 70MHz-6GHz 2R2T B210 Mini?
Not sure on that, but it's likely only capable of working with the KrakenSDR
Better than trying to carry a full-size Wullenweber array in your shirt pocket 🤣
Yep, a bit more portable 😂
Fun way to spend some money
Sure is 😂
Hi. Nice video. I am looking for version 1.322. They don't have it any more in github. Do you have this image?
Pi image?
Yes. For Pi 4 ver 1.322
@@The_Comms_Channel yes. IMG with ver 1.322
@@freedom1307821 I don't have it, but it can be found using the Wayback Machine website
@@The_Comms_ChannelAnd I can download it?
I googled this because I was thinking you could probably engineer a passive Radar array that just listens for radio signals.
So far I've found this and a ww2 area oscilloscope thing called a hfdf
But yeah, that pretty much confirms my suspicion.
I'll bet the military has something like this with a gazillion antennas that could track and classify multiple radar sources. And if not.... Then what am I paying so much in taxes for?
The military will generally just use active radar unless they're worried about being detected. The problem with passive radar is it relies on radio signals from others like TV or AM/FM radio so if you're operating in an area with no radio signals, it won't work. There is this device for military use that is similar to what you're talking about though
ruclips.net/video/ez7chMwwMSk/видео.htmlsi=nAsTO3Wj8MPqfgXh
I was not expecting this video to feature locations only an hour from me 😅
You'll see more locations nearby soon 😄
@The_Comms_Channel I'm in Charleston, TN off of Highway 11, feel free to stop by sometime to see my shop!
Appreciate it! I believe there's a good node in Athens that you may be able to reach from there.
Setup a very hard target I'd like to see
Will do!
@@The_Comms_Channel Looking forward to it! 😁
That will get someone shot if they use it to harass some of the pirates out here !
Time for armored vehicles 😂
Where's the Apple app?
The Apple app is currently in development. Not sure when it will be released
I was wondering how they track people who are illegally broadcasting. This is interesting.
The FCC has a more advanced version but similar concept. But with this, we finally have an affordable and capable tool
There are much cheaper and simpler ways. Just use a beam antenna for vhf and higher, or a loop on HF. Any directional antenna will give you a direction toward the transmitter.
This is much quicker
@@The_Comms_Channel As a fox hunter with decades of experience using many different DF systems I think I can challenge that assertion. I notice you just assumed one of the towers was the transmitter, and you didn't determine which one of them was actually transmitting. The Kraken system isn't much different from doppler DF systems we've been using since the 80s.
Yes, this wont pinpoint exactly which tower, but you're not going to find the general location of a signal miles away within a few minutes like this will. As mentioned earlier in the video, we'll be covering the traditional methods where we'll use attenuators, harmonics to narrow down a signals location once we get to the general location of it.
Pseudo-doppler and correlative interferometry do NOT like multipath
They definitely do not