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Natural Radio From Lightning Sounds INCREDIBLE- VLF Radio 

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Every time lightning strikes, a huge assortment of stuff is released. We're all familiar with the usual flash of light and sound, but what you probably didn't know is that lightning releases a huge burst of radio as well. This type of radio, known as VLF radio, is some of the strangest there is. By converting this radio directly to sound we hear a cacophony of sounds, from pops and click, to animal like chirps and even strange sci-fi sounding noises. There's lot of other phenomena that can also produce VLF radio like this and by learning what each sound is, and when to listen for them, you can learn a lot about what's going on on earth.
More links:
abelian.org/vlf/
theinspireproject.org/default....
microsferics.com
www.auroralchorus.com/wr3gde.h...
members.home.nl/fkooiman/light...
www.popularmechanics.com/spac...
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25 авг 2019

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Комментарии : 477   
@stormchaser8576
@stormchaser8576 4 года назад
As a child, I used to go to the clearest AM radio station if storms were near and listen for loud crunches in the signal. Would give me an idea how powerful the thunderstorms coming were.
@vladd9344
@vladd9344 Год назад
Me too!
@AldoSchmedack
@AldoSchmedack Год назад
Same!
@josephkanowitz6875
@josephkanowitz6875 Год назад
ב''ה, pretty much every receiver ever doesn't need a carrier present for this; some detail on how the broadband noise 'emulates' one to result in the audio output would be a nice demonstration of receiver theory.
@Afrotechmods
@Afrotechmods 4 года назад
"Aurora Borealis? At this time of year? At this time of day? In this part of the country? Localized entirely within your kitchen?"
@GoldSrc_
@GoldSrc_ 4 года назад
Yes :D
@jared6208
@jared6208 4 года назад
May I see it?
@Gameboygenius
@Gameboygenius 4 года назад
_> ... no.
@dioszegizoltan4493
@dioszegizoltan4493 4 года назад
You’re alive ?
@dominator167able
@dominator167able 4 года назад
@@GoldSrc_ RISE AND SHINE DR FREEMAN
@JohnSmith-one
@JohnSmith-one 4 года назад
Every video is like science paper or a bachelor's diploma. You're a very motivated man, wish you luck and never lose your enthusiasm and curiosity)
@thedoctor2102
@thedoctor2102 4 года назад
When I used to have a 27Mhz cb radio, I liked to switch it on during a thunderstorm and listen to the lightning coming through the radiofrequencies. I could also hear the whistles from sunspots or solar flares and chirps from cosmic rays hitting the atmosphere or magnetosphere.
@lightsupportweapon
@lightsupportweapon Год назад
sounds that go “TWEEP!” linearly when you receive with single sideband are likely ionosondes
@josephkanowitz6875
@josephkanowitz6875 Год назад
@@lightsupportweapon ב''ה, wave height radar is another common one on SW.
@paulbishop9896
@paulbishop9896 4 года назад
While growing up, my dad had a portable SW/MW receiver, and I loved finding sferics.. found great amusement, great memories
@AsymptoteInverse
@AsymptoteInverse 3 года назад
I've been fascinated by the idea of listening to electromagnetic signals for years. For those interested, it seems to be possible to hear the noise local lightning makes by tuning to an otherwise empty spot on the AM radio band. In my car, I've picked up what I think is the noise of lightning (sharp bursts of static), the hum from powerlines, and noises from those vehicle-detection loops in roads. And a handheld AM/FM radio will pick up stuff like the noise from switch-mode power supplies quite nicely, too.
@filonin2
@filonin2 4 года назад
7:27 I like that you're using future Earth with a flooded Amazon and Greenland and no Florida.
@thethoughtemporium
@thethoughtemporium 4 года назад
I wish I'd gone with an amazon on fire instead tbh.
@filonin2
@filonin2 4 года назад
@@thethoughtemporium The flooding will maybe make it into a nice inland swamp after it's all been burned? ¯\_(ツ)_/¯
@brendancarlson1678
@brendancarlson1678 4 года назад
Do we, as a planet, really need Florida?
@mattshap9731
@mattshap9731 4 года назад
tbh eliminating florida gets me hyped for glacial melting
@DogsRNice
@DogsRNice 4 года назад
Futureproofing it
@atomipi
@atomipi 4 года назад
Spark Transmitters! Were the first experiments in radio transmission.. can also create broadband noise which interfere with technology. I made one when I was about 12 in the 80's with an oldschool relay and battery with an aerial wire attached, vibrating in a soundproof box to annoy my new stepdad watching HIS show on my (family room) TV. haha.. all through his show, the screen would be static, but my channel was perfect.. (turned relay spark transmitter box off) hehe.
@jaymercy224
@jaymercy224 4 года назад
As a kid, I built self-made telephone systems for our home and always wondered about that crackling noise that was on the line. Now I know what they are. Thank you!
@ryPish
@ryPish 4 года назад
So... Thunderbirds are real? I knew it!!!
@EzeePosseTV
@EzeePosseTV 4 года назад
FAB
@nixietubes
@nixietubes 4 года назад
If Pontiac made an electric car
@MrZylix-6
@MrZylix-6 4 года назад
Ry P OMG!
@KoKo-gm1kq
@KoKo-gm1kq 3 года назад
@@EzeePosseTV j
@Emilmarch
@Emilmarch 3 года назад
😅 they are mate.
@maglight117
@maglight117 4 года назад
Oh man you did a video on the thing that got me into HAM radio! One book I've found that is basically an atlas of things you see in VLF is "Whistlers and Related Ionospheric Phenomena" by Robert A. Helliwell. Dover sells reprints on it and I definitely recommend it to anyone into VLF. It covers everything from whistlers to sferics.
@TwisterKidMedia
@TwisterKidMedia 4 года назад
VLF is the fundamental principle for all the lightning detection systems we meteorologists use. Lightning tells us a ton about how strong the updrafts and downdrafts are in thunderstorms. Lightning jumps can help predict tornadoes as well.
@K31TH3R
@K31TH3R 4 года назад
A few years back before their takeover, when Wunderground's Wundermap rivaled professional meteorologist tools and wasn't a steaming pile of bloated garbage, they had an awesome lightning map which showed cloud-to-cloud and cloud-to-ground strikes. I always wondered how that was done. It seemed like black magic to me and I never managed to stumble upon the methodology. Thanks for finally answering my questions. Also, thanks for the links, I'm going to spend a lot of time listening to these in the background.
@novosprospectus882
@novosprospectus882 4 года назад
You can also see the RF of thunder/lightning using an SDR tuned into the HF spectrum.
@Roxor128
@Roxor128 4 года назад
Even easier: Hook up a loop of wire into your sound card's microphone input.
@rodrigo_dm
@rodrigo_dm 4 года назад
Man let me tell you this: Your channel inspired me to create one on my own. Like you said I should in the comment section months ago. You inspire us all with your research and projects. You are much appreciated. Thank you for the QUALITY content. cheers!
@tegrqbruh4158
@tegrqbruh4158 4 года назад
When i was younger i always found myself listening to MW and hearing the static noise that lightning strikes made. Good times.
@goon143
@goon143 4 года назад
Earth layin down the hot tracks.
@HavanaWoody
@HavanaWoody 4 года назад
The dynamic range of your interest is incredible , never a dull topic and always well documented.
@prescott231233
@prescott231233 4 года назад
Aliens : *listens to the song of earth from outside our planet.* “They must do so much acid”
@iansutherland4902
@iansutherland4902 4 года назад
This channel is a freakin' treasure trove. Good job being awesome, keep it up, please!
@charlieangkor8649
@charlieangkor8649 4 года назад
its fun to connect a small photovoltaic panel to headphones. Then you can hear lightning strikes immediely. Each has very different sound. After hearing for a while you will know what kind of sound will produce a really hefty thunder several seconds later.
@UNSCPILOT
@UNSCPILOT 4 года назад
Never heard of that before, definitely will try
@ingussilins6330
@ingussilins6330 Год назад
I use VLF receiver with photodiode. It can pick up lighning, fireworks, small explosion flash ( from fireworks ).
@jefflyon2020
@jefflyon2020 2 года назад
You hit that subject out of the park, home run! loved the breakdown whenever explaining the natural world and how things in it work.
@tonysolar284
@tonysolar284 4 года назад
4:50 So lighting has been sending tweets long before any human ever did.
@UNSCPILOT
@UNSCPILOT 4 года назад
Or birds for that matter
@gustavgnoettgen
@gustavgnoettgen 4 года назад
Such a chirping also occurs when you strike metal bars, heavy cables under tension, and when MCU Whiplash uses his whips.
@charlieangkor8649
@charlieangkor8649 4 года назад
Gustav Gnöttgen when train is arriving I hear that from the rails in the station.
@CHASSYification
@CHASSYification 4 года назад
Yes I’ve heard that to, from the train tracks and I’m now thinking from the chair lift at the snow fields
@gustavgnoettgen
@gustavgnoettgen 4 года назад
@@charlieangkor8649 yes! It's especially disturbing (=AWSOME) when the train rushes through
@gustavgnoettgen
@gustavgnoettgen 4 года назад
@@CHASSYification I never used one, nice info!
@univac2000
@univac2000 4 года назад
You can hear bug’s wings also.
@SinceNightmoon
@SinceNightmoon 4 года назад
Amazing ! Good that RU-vid Recommended ur Channel ur Voice is rly Calm and i love it to hear it! Keep it up!
@fletcherreder6091
@fletcherreder6091 4 года назад
Conspiracy theory: Justin is a machine, and none of the sounds were biological in origin.
@ohboy1113
@ohboy1113 4 года назад
What art style is that pfp? It seems vaguely reminiscent of “the true story of the three little pigs” and the illustrations in that book collection.
@moncef0147
@moncef0147 4 года назад
Duuude, that's actually literally the Chidori sound.
@LiborTinka
@LiborTinka 4 года назад
I just peaked into comments to see a Chidori reference and I wasn't disappointed! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-AyQi0N3zuGU.html
@moncef0147
@moncef0147 4 года назад
@@zwordbirdb619 r/iamverysmart , you kmow that we arent born 30 right? The last time i watched naruto i was 15, i'm 27 now.
@dissonanceparadiddle
@dissonanceparadiddle 4 года назад
@@zwordbirdb619 I'm sure you have your own hobbies as well. And I bet you care about them greatly. 😊
@inhumanfilth681
@inhumanfilth681 4 года назад
@@zwordbirdb619 you are kind of a poon, did you know that?
@dissonanceparadiddle
@dissonanceparadiddle 4 года назад
@@zwordbirdb619 well that's something I guess
@Stakodron
@Stakodron 4 года назад
Wow the effort which goes into this video is amazing !!
@karhukivi
@karhukivi Год назад
Lightning generates a spectrum of noise, from the MF to the VLF band. The higher frequency noise pulses are attenuated more rapidly and this is a method of determining the distance to the strike. There are small devices tp clip on the belt for use outdoors, hiking, mountain climbing, golf etc, which detect the MF and LF noise and give an approximate distance.
@slehar
@slehar Месяц назад
Wow! Deep knowledge! And excellent graphics! Thanks!
@NikHYTWP
@NikHYTWP 4 года назад
Nice video, though I miss satellite content. I love seeing you pick up signals from equipment that's hundreds of miles away in space!
@3v068
@3v068 Год назад
Hey man. I ended up seeing this video when it came out, and I recently got a HackRF One, and this allowed me to look for similar phenomena. Thanks for giving me something new and cool to look for!
@JustMeUpNorth
@JustMeUpNorth 2 месяца назад
Lightning, the nemesis of every DX-er! 😂 Always knew when a storm was around as a kid with my radio.
@insightfool
@insightfool 4 года назад
Love this! This video was so great. Thanks.
@CyclesAreSingularities
@CyclesAreSingularities 11 месяцев назад
those sounds are crunchy as hell and i love it!
@nerdyguyfatman
@nerdyguyfatman 11 месяцев назад
I was trying to explain this to someone, your video did a way better job than I could
@MR5er1
@MR5er1 4 года назад
Perfect! One of the available receivers on the website you gave is in a town 20km from my house
@Xenro66
@Xenro66 4 года назад
A part of me really wants to get a VLF radio... But another part of me wants a hand held version specifically for man-made VLF emissions. A few years ago, I decided to chain a bunch of transistors together to make a long darlington chain, with a 15cm antenna... Damn, it was so interesting walking around the house with some earbuds plugged in, powered from a small battery and just pointing the antenna at things to hear their radio emissions.
@CHASSYification
@CHASSYification 4 года назад
How amazing!! The things most of us will never know about are just amazing..... wow
@Ikaros---
@Ikaros--- 4 года назад
A few months ago a thunderstorm rolled over the UK, and I was wearing headphones at the time. Right as a big lightning strike happened, I heard an EMP create noise in my headphones seconds before I heard the thunder.
@maschwab63
@maschwab63 2 года назад
5 seconds per mile, 3 seconds per kilometer distance.
@goon143
@goon143 4 года назад
17;03 "One last note", I love me some puns even if they may be unintentional .
@TheRailroad99
@TheRailroad99 4 года назад
Very interesting, and a great idea to use them for tracking lightning bolts.
@EugenethePhilostopher
@EugenethePhilostopher 4 года назад
Very informative and clean video. Thanks.
@zakolia
@zakolia 4 года назад
Hello from Montréal! That makes me proud of my city. I can see my worksite from up there!! Very nice charnel .
@cforn
@cforn 4 года назад
Excellent video!! Thanks!
@khashayarmodaberi4958
@khashayarmodaberi4958 11 месяцев назад
Its so interesting! It sounds like raining and birds are singing in the rain! Such a beautiful theme!! The will of the lightening!!❤😊
@h0verman
@h0verman 4 года назад
i recently got a device called an Ether that can listen to a very wide spectrum of electromagnetic frequencies and listening to a thunderstorm seems to get sounds that just miss the very low radio waves leading to just some dry crackling. still very cool
@danielpetka446
@danielpetka446 4 года назад
Dude you shouldve been my science teacher
@Gleem
@Gleem 4 года назад
Excellent video, thank you.
@essoxlucious5821
@essoxlucious5821 4 года назад
Very informative, thank you 👍
@Wallrod
@Wallrod 4 года назад
Friggin cool video. Gonna fall asleep listening to space wind and cloud farts now.
@zachell1991
@zachell1991 4 года назад
That's pretty cool. I have never heard about this before.
@jmannUSMC
@jmannUSMC 4 года назад
Sweet you live in my favorite city ever visited! Also, now I can't wait until lightning strikes again
@zyxzevn
@zyxzevn 4 года назад
A major source of electromagnetic chirps that ligo can also detect. It can affect the mirrors. :$
@giantqueermess264
@giantqueermess264 10 месяцев назад
i could listen to this all day
@qshad6973
@qshad6973 4 года назад
I'm a HAM radio operator because of you now ❤
@astroguy8210
@astroguy8210 4 года назад
Great video sir hope to see more of these videos
@kylebowles9820
@kylebowles9820 4 года назад
Nice footage, crazy physics! You kinda forget that photonics really does scale with wavelength!
@M4CHINE69
@M4CHINE69 4 года назад
Fun fact if you take a headphone jack with a very long wire and plug it into the microphone then download a program called saqrx which is vlf software to view it then you can see vlf signals which is pretty cool. Edit: I recommend sdrsharp instead of saqrx since sdrsharp has more features
@VinceTibo
@VinceTibo 4 года назад
Great video as usual! Would love to chat with you when I come to montreal, just see what you're up to! Much love, keep up the good work!
@StatisticalError82
@StatisticalError82 4 года назад
Great video, have always been interested in learning more about the ionosphere, and this also serves as a great update to your previous video about VLF On the subject of radio, though, what's happened with your SDR stuff? I haven't heard a peep about it in months. You had ambitions plans about rebuilding Pipsqueak and mounting him in a radome when summer came around
@thethoughtemporium
@thethoughtemporium 4 года назад
Got busy with other things. This is why I stopped making update videos. Beyond no one really watching them, I'd get people excited for a project before getting distracted or busy with a different one. As with all of my projects, I will get to it eventually, but I pick the things that I find the most interesting at the time so I don't get bored and burnt out. That said I have actually been working on it in the background, just hasn't made it into media. Found a place to set it up permanently, but will need to wait for next summer as the season's already basically over.
@Wombattlr
@Wombattlr 4 года назад
Just went to that live VLF website and within a few seconds of listening to a station, I heard a whistler
@jaredloveless
@jaredloveless Год назад
This reminds me of, when, As a kid I used to like listening to the strange sounds in abetween radio stations and particularly at the ends of my radio's dial.
@grahamhurlstone-jones5664
@grahamhurlstone-jones5664 4 года назад
That is fantastic ! thx...
@charleslambert3368
@charleslambert3368 4 года назад
So hyped to get an rtlsdr and listen to all this stuff.
@williamgoeres138
@williamgoeres138 4 года назад
This is awesome!
@timothybackhus824
@timothybackhus824 Год назад
When I was little little I would turn my radio on during a thunderstorm, and I thought it was so cool that I could hear a burst of static and see my window light up at the same time. Thought I was the world's greatest physicist for "discovering" it
@nerfatron
@nerfatron 4 года назад
Ive picked up whistlers on CB before when skip is rolling in strong, never knew what they were untill now
@kovoc7135
@kovoc7135 4 года назад
I love these radio videos
@cptpinecone
@cptpinecone 4 года назад
Holy frick I forgot how much I like this channel.
@kilovoltamp
@kilovoltamp 4 года назад
oh damn I saw these when I got a cheapo SDR a few years ago and I had no idea what they were and none of my friends could figure it out either, that's rad.
@mimoslavija
@mimoslavija 3 года назад
I really like your device because it is very sensitive and can produce those sounds, unlike mine, which only rings when it detects a strong electromagnetic wave.
@thunderousavenger7437
@thunderousavenger7437 4 года назад
These sounds could create some amazing asmr
@stighenningjohansen
@stighenningjohansen Год назад
To me listening to SW/AM/LW is like listening to the world, esp in summer. I can hear thunderstorms before they arrive, and many times I can see the light flicker at or from below the horizon, then, in an hour it takes off, right over my house
@750kv8
@750kv8 4 года назад
I listened to streams on that website, what a find! Literally what pop rocks sounds like. :D
@williambennett4360
@williambennett4360 4 года назад
I'll now be listening to lightning to fall asleep..
@deanrobert8674
@deanrobert8674 4 года назад
In Australia when you scuba dive you will hear that very similar sounds which indicates a healthy reef with crayfish. The louder the clicking the more crayfish in the area.
@kellingc
@kellingc 4 года назад
Really cool stuff. As ham radio operator, this facinates me.
@MrBanzoid
@MrBanzoid 4 года назад
Most interesting. Thanks.
@AtlasReburdened
@AtlasReburdened 4 года назад
So, back when I had to study all this we never actually covered atmospheric wave guide propagation and your explanation has me wondering if a soliton packet could be injected into it and whether data could be modulated into it. Have you seen any literature referencing such a feat?
@johnpossum556
@johnpossum556 4 года назад
This might be obvious but... if you're making it of course you can. If it's naturally made I wouldn't imagine there is an easy way to do so. The sub communication is fascinating and most of their communication is done on ELF. Extra Low Frequency. A lot of time and money was put into it back when we had the polaris missile (nuke capable) on the trident sub as a first launch capability near the end of the cold war. For its time it was very impressive. It also included a 11 mile long antenna array in colorado you might look up. You might enjoy it.
@josephkanowitz6875
@josephkanowitz6875 Год назад
@@johnpossum556 ב''ה, without enough tweakers stealing the copper DoD would lose some of their rape budget.
@ryanatkinson2978
@ryanatkinson2978 2 года назад
I've always wondered how lightning strikes are detected! Thank you
@Space-Audio
@Space-Audio 4 года назад
Lightning, aka "whistlers' mother" . . . A nice summary focusing on ground-based VLF recordings. I host a historical archive of Steven McGreevy's material at www-pw.physics.uiowa.edu/mcgreevy Two minor corrections to this video: The "dawn" in dawn chorus doesn't really have anything to do with local time; it's merely a reference to the morning song of jungle birds that the signals sound like. Also, it's my understanding that the VLF emissions don't push away the Van Allen belts, but drain it near the Earth. Also, if you want to hear similar space audio recorded by spacecraft . . . you know where to look.
@witwisniewski2280
@witwisniewski2280 Год назад
I used to listen to VLF a lot. The trick was to either go to a desolate location (freeze to death in a car late at night) or use a repeater to send the sound to a more convenient place. It is very hard to predict the occurrence of VLF emissions and whistlers, therefore one should just record all night and later look at the spectrograms to reveal the interesting events. These days Audacity on any computer with a sound card can easily record for hundreds of hours at a time.
@TheARN44
@TheARN44 4 года назад
Just heard a few myself on that site. Neat!
@proxy1035
@proxy1035 4 года назад
4:08 why does the graph say "Kelvin meter seconds" though. /s jokes aside i always had mad respect for lightnings, i mean isn't the cloud to earth thing just a giant capacitor? and a lightning is "just" the voltage building up so high that it breaks through the dielectric
@satviksharma1146
@satviksharma1146 4 года назад
अरे गजब।
4 года назад
Fascinating
@prawnmikus
@prawnmikus 4 года назад
Super damn fascinating!
@1.4142
@1.4142 4 года назад
Underrated!
@Rotem_S
@Rotem_S 4 года назад
What do you mean by "living under a magnetic field line"? the lines are as far as I know just a visualisation tool and you're always "under" one
@sonotthere
@sonotthere 4 года назад
he ment it more in teh sens that you have to be near the poles where they so to say enter the gound more since the signals follow the lines. the densety of the socal feild line is higer near the polses
@kfftfuftur
@kfftfuftur 4 года назад
also if you followed the field line you are under you should be able to find lightning on the other side. Otherwise it wont work
@Inexpressable
@Inexpressable 4 года назад
bro why is your name in the middle of your comments age. teach me
@IHateMadeUpNames
@IHateMadeUpNames 4 года назад
If you’ve ever seen ferrofluid under influence of a magnet, you can see that there are regions the fluid congregates towards and forms pointy nodes which depend on the strength and location of the field. The regions and nodes can be remarkably consistent with respect to the location and strength of the magnet. You can almost always predict where the fluid will flow to if you’ve seen the same state (of the magnet wrt. the ferro fluid) before. Now, are those places/points of congregation where those pointy nodes show up actual, physical “field lines”? I’m not sure, but it is tempting to call them that. (edit: typo/parenthesis)
@denelson83
@denelson83 4 года назад
You also get tweeks from these VLF signals travelling "the long path", all the way around the Earth and hitting your antenna from the other side.
@JxH
@JxH 4 года назад
@15m23s: As far as I know, the submarines are in Receive Only mode for VLF. Given how huge the transmitters are (Cutler ME is famous), it's a one-way system. As far as I know.
@fortunateson6070
@fortunateson6070 4 года назад
I've often thought since I was a kid, that if we could capture lightning we'd have no need for any other energy source.
@MadScientist512
@MadScientist512 4 года назад
A lightning powered Tesla coil would be the ultimate Mad Science Project though too large-scale to be practical, but capturing lightning with a rocket and steel wire seems the sort of thing these guys'd be well capable of, with perhaps a coil gun or the like at the end, we can't all have a Flux Capacitor :) Great video as always of course.
@vega1287
@vega1287 4 года назад
about your geko tape , i found a good sorce of a material suitable as a mold , it is the poralization filter from an lcd montor , i iven had one thst stuck to my closet althoagh i feel like it was more electrostatic related but still
@aathish04
@aathish04 4 года назад
Cool! Have you tried using the grooved underside of a CD or similar media? I hear they have very narrow grooves.
@thomasortlieb2146
@thomasortlieb2146 4 года назад
thats sooo cool
@RomanLeBg
@RomanLeBg 4 года назад
I watched it all great videos lol
@ripjou2304
@ripjou2304 4 года назад
Lol
@ajhicks268
@ajhicks268 4 года назад
I live just down the road from Todmorden, UK 👍
@brothertyler
@brothertyler 4 года назад
Good job
@JxH
@JxH 4 года назад
@12m46s: Direction finding is actually by means of timing. The data is time-stamped using GPS derived precise time. The diagram shown mentions T1, T2, etc. i.e. time, not directly direction until the location is pinpointed via the timing.
@JxH
@JxH 4 года назад
@12m59s: Note the green LED marked "GPS". The GPS data of course gives the location of the receiver, but also the precise time stamp of each noise burst. The antenna shown is clearly not directional.
@jordanrodrigues1279
@jordanrodrigues1279 4 года назад
I'm sure GPS can synchronize clocks very precisely. The relationship between precision in time and precision in space is the speed of radio waves. 30cm equals 1 nanosecond, so even a rough GPS receiver is within a few tens of nanoseconds of the actual GPS time. But that's using a different technique - interferometry - that depends on the GPS signals repeating in time. With the lightning strikes, you'd have to measure the edges of the signal. It seems obvious to use an ADC, much like an oscilloscope, and a software-defined radio but there are still potential problems with clock jitter. I'm sure the detector sample clock needs to be synchronized with the GPS clock directly; software that simply looks for a signal and tries to record the "current time" from an ordinary device driver or firmware wouldn't be precise enough, not when 10 microseconds equals 3 kilometers. That means at the very least tapping the GPS local clock signal and measuring it with an ADC channel, but there are probably other nuances, such as figuring out which clock pulse corresponds to a particular millisecond in GPS time. Basically, GPS is really good, but the rest of the hardware in a typical Arduino-like device isn't quite up to snuff for building that kind of sensor easily. You need to be able to compare the timing of the GPS signals to the VLF radio side by side, at a level of precision that equals the execution time of a few hundred instructions. It's possible, but not if using software alone.
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