ฝัง
- เผยแพร่เมื่อ 24 ก.ค. 2024
- The same innocuous satellites that you use for navigating in your car are sometimes involuntarily used as space-based walkie-talkies.
(also I am aware of the typos at 3m43s, spotted after already rendering and uploading, too bad)
Links:
My website and other social media - sgcderek.github.io/
Timestamps:
00:00 - Intro
00:33 - SARSAT overview
04:40 - NOAA
06:33 - BeiDou
11:25 - Galileo
13:57 - Glonass
15:09 - GPS
19:03 - Elektro-L
20:23 - Insat-3
21:02 - Outro - วิทยาศาสตร์และเทคโนโลยี
I saw this voice transmissions in another video three years ago (video "Ретрансляция китайских раций системой спасения Cospas-Sarsat" in russian). And in the video author metioned that all voice transmissions are generally in chinese. Also he mentioned that duiring LEOSAR and MEOSAR passes over europian part of Eurasia, number of chinese voices reduces drastically. In the commets someone wrote that "But we have MPT1327 trunk system, and it has frequency 406 Mhz. And we have a regulator permit on this system & frequencies". I suppose that some "digital transmissons" may be from that sort trunk systems from Russia, because some frequency ranges in Russia may have two-level system of usage, with primary users and secondary users.
Also I like your content. Subscribed. ;)
All pics of satellites are CGI. Sorry but it’s all fake.
Wow. I am actually responsible for maintaining the registrations for 80 of these beacons for boats, an aircraft, and a ton of field personnel. I had no idea that the signal was literally just "rebroadcast" I thought that the satellites were actually processing the data themselves and then sending the data back to earth. I learned something big today. Subscribed and if this is the type of content that you're going to be making, stuff of this kind of technical nature, I am definitely subscribing and looking forward to more!
Rebroadcast and processing the data themselves is the same thing
@@funnycatvideos5490 not entirely, the LEO satellites actually do both rebroadcast and processing, whereas MEO and GEO satellites do rebroadcast only. In the video I've shown the zoomed in spectrum of the NOAA-18 downlink where you could see the digital processed data.
""SilentSirBob????
You are a liar!
Not sure if it was mentioned in the video as am watching the adds but they are referred to as bent pipes
@@MichaelKingsfordGrayare you just a random troll ?
Your channel is super underrated.
I had heard rumors that people were doing this but had never seen it on video despite searching online. Totally awesome video, and as far as I can tell you're the first to report about this on video!
I love the slow pan and silence at 16:41 and then the hard cut. I'm not sure why that made me laugh as much as I did. Awesome video, stop (don't) tempting me to spend more money that I don't have to start getting into SDR and HAM radio realm.
Great video as always, amazing work...
I love technology so much. This is so cool.
Great video very interesting. In the past I have personally seen low bandwidth rogue data streams uplinked to geo sats.
Which satellite would that be? I plan to go over the VHF/UHF military satellite transponders soon as well
1:14
Casualty: "MAYDAY - I crashed into the WIndows 95 screensaver hills"
RCC: "I'm sorry you need to upgrade to Windows 11"
⛑⛑⛑
Great video (as always). Thanks!
Wow mluvíš hrozně dobře anglicky, vůbec jsem nevěděl že mluvíš česky do ty doby něž jsem viděl tabulky xd, super video
Czech, M8, and pwn to king he is baller da! wanna see.hoe to diy 500kV transformers althoufh I three out my MOVs cause they csgpcked me once eve with magic wand *I can still feel the hertz*
0:19 is in Minnan dialect of Chinese, it's roughly saying:
"D*mn, F**k your m*m, my truck bed is out of electricity"
ok that audio can stay in
Ive actually accidently picked up a LEO sarsat before whem doing L band stuff with that becon in the centre and the slightly weaker repeater sidebands.
0:17 the sound is from Taiwan, what he said was "shix fucx , my truck bed is out of battery."
You got a new sub here. Awesome content.
I'd love to try this but I don't have a green fridge
Me either. Can't find one either since it's not the 70's...😜
I tried using a stainless steel mini refrigerator. What I received sounded a lot like a self-righteous soccer mom.
@@indridcold8433Add some rainbow colors and she'll be gone!
Do you have a link for the transponder frequency list you were using? Cheers.
6:55 is so great haha. they were looking for you!
At first I thought one would need to transmit an enormous amount of power (many tens or hundreds of Watts) to unintentionally hijack a transponder 20.000 km away.
I did some calculations. At 406 MHz (lambda = 75 cm is a good enough approx), the FSPL is -170.5 dB for a MEO satellite orbiting 20.000 km above the Earth. Assuming the Earth is a disc of radius 6000 km (of course IT IS NOT), the satellite's antenna gain is approx 16.5 dBi. Assuming the transponder has a NF of 0 dB, with a noise density of -174 dBm/Hz, only +30 dBm of transmit power from the Earth is enough for a 10 kHz signal to be 10 dB above the NF.
Of course the transponder's NF will be higher than this, but actually only a few watts at the wrong frequency is enough to be heard by the transponder. Impressive !
I hope those interferences do not render this system unusable as it can save lives (and also costs money).
According to Wikipedia, 406 MHz have 5 Watts (37 dBm) of TX power. Older 121.5 MHz beacons transmitted at only 50 mW !
interception and decoding of thuraya sputnik communication signal by hackRf receiver and listening to voice message???
This is really cool!
Another amazing video, keep up the great work
Very interesting video and information. What is the main SDR you use for the reception of these satellites, also where do you get your LNB and down converter equipment? Thank you.
If I need to go over 1.8 GHz and/or 2.56 Msps I use a HackRF clone, otherwise I use a Nooelec NESDR. Other than the two Bullseyes all my LNBs are off-the-shelf hardware
@dereksgc thank you for the info.
I have several Sdr's, including the hackrf, sdrplay, etc. I would need a dish and LNA /LNB'S. Clockwise and anticlockwise antenna, too.
A SDR Play RSP DX and SDR Angel Software is Perfect for this!
people think a satellite does only one thing, that's not how that works, think of it - they call it a Bus- as a shelf, where you install all kind of radio equipment, most racks will be powered for GPS and its back up system, while you can still have a couple more racks free for other applications, like radio transmission, communications and all, just like research satellites embarks all kind of equipments to measure solar winds, detect signals, take all kind of images all in one box.
What are the input frequencies to this "repeaters"? I found some info that says 121,5 MHz (analog) and 406,025MHz (digital data). I wonder is there any CTCSS code or something.
whatever frequency they are using on the uplink, it is strictly forbidden to transmit anything on it, especially because it's shared with aviation
@@dereksgc Yes, I am fully aware of this. I am just curious about technical details. HAM bands are wide enough for me 😀. Greetings.
What "radio" settings did you use please? Thank you.
did you bring the fridge just for reflecting? :D
anyway, thanks for these informative videos about interesting topics with high quality examplification!
At what frequency do those walkie-talkies that are heard via satellite broadcast?
Interesting video, thanks. I wonder if it's possible to capture some of these signals with SDR and knowing the satellite orbit then identify the origin with some complicated maths.
The list of active satellites is published, so you can simply look where your antenna is pointing and correlate it to their current positions
Yes I mean to locate the origin of the voice signals.
I guess the uplink is subject to Doppler shift, then it gets shifted on frequency to the down channel, then subject to Doppler shift again.
Ok I get it now. Yeah that could work, first you compensate for the satellite Doppler and then you figure out the reverse uplink Doppler. There's a program called strf that does this but it's usage is way beyond me
@@dereksgc Short form: You don't really need to measure the exact doppler shift. What you need is the rate of change for the doppler shift.
The further away the satellite is from the transmitter, the greater the doppler shift. Don't worry about _how much_ doppler shift there is, just compute the rate at which it is changing. That rate will decrease as the satellite gets closer. When the satellite is at its closest point of approach to the transmitter, the rate of change of the doppler shift will be zero. Once the satellite goes on past, the doppler shift will increase again and the rate of change will increase until it finally goes out of range. ("first derivative of the doppler shift", in other words)
When the doppler shift is zero, the signal is coming from somewhere on a plane exactly 90 degrees to the satellite's path. Compute this for two sateliites (or the same one on a later orbit) and you now have two planes that cross making a line. The transmitter is somewhere along that line. There's a big chance it's wherever the line intersects the earth's surface, otherwise it's an aircraft and they fly around 40 times lower than satellites so you know it's going to be close there anyway. A third doppler measurement will solve that problem precisely but if the source is terrestrial or close enough then that's sort of just gravy.
Pedant Alert: a simple satellite transponder merely transposes the uplink frequency band to a downlink band.
Nice video
Doesnt the reflection off the dish change the handedness of the polarisation?
It does, hence why I use LHCP feed for RHCP satellites (NOAA and BeiDou) and then had to switch to RHCP feed for LHCP satellites.
@@dereksgc thanks, i must not have been paying enough attention, love the videos
So if ur receiving can you transmit? Like a modern HAM kinda thing?
Intentionally transmitting through these satellites would be highly illegal (unless it's an emergency). But there are actual ham radio satellites currently in orbit that have radio repeaters open to anyone with a license, so you can achieve the same thing legally (including one in geostationary orbit through which you can relay your signal to almost a half of the planet)
How to end homelessness:
1. Interfere with emergency and forbidden frequencies
2. Get in jail...
That list of satellites, where is the source of it ?
Very interesting!
I can't understand how GPS sats appeared on 2,2GHz.
'People of Earth, your attention please! ...'
255.55Mhz FM is a very active with satellite bounce communications. Most communications are in Portuguese. However, there can be heard some Spanish and English, as well. Please tune in and enjoy thed chaos.
I've received a couple of those as well, though in their case those are almost 100% just straight up illegal operations. There is also quite a lot of interference around that band for me
So you are saying, that those little yellow things are reaching GPS satellites, that are orbiting at 20000km altitude?
Yes, and some are even at 40 000 km
(and some much closer at around 850km, depends on the satellite and the way it's orbiting around the globe)
Is there one that ppl can use like a ham relay?
There are several if you have the appropriate license and hardware. One in geostationary orbit even has better reach than these do
Which SDR program or hardware are you using?
Software is SDR# and hardware in this case was the HackRF as the SDR and a self-made LNA. For non-video purposes I would recommend SDR++ instead
@@dereksgcThank you : )
I have a whole lot of surplus DirectTV dishes, what do I need to use to replace the horn on them to use them with my DX-390 and DX-398 PLL Shortwave receiver? th-cam.com/video/tDHFdtMtfVc/w-d-xo.html
th-cam.com/video/QXuRLpVetyk/w-d-xo.html
th-cam.com/video/uhoubfgiyHs/w-d-xo.html
th-cam.com/video/3tx6_sH4UXs/w-d-xo.html
th-cam.com/video/NNmGWM8FsEg/w-d-xo.html
Not sure exactly what you mean by this. Assuming that DirecTV dishes are similar sizes to European ones then the lowest frequency you can use that on is probably around 1 GHz
Why did I know, you are from czech republic before looking at your channel 😅
Do you know why the video for wifi antenna got so popular? Yeah because many people need to have long-range wifi solution. You know, definitely not stealing the signal from across the street.
In that case get ready for more internet stealing content soon
Nice video! Subscribed! 73, M1GEO.
from 17 to 21 seconds, i heard some Hokkien swear words. either from Taiwan, Malaysia or Singapore
3:00 hardcore heli rescue 🤣
16:55 casually flexes a 2.5m dish holy crap
1:34 it is easy, it is 38°15′00.5″N 122°24′38.9″W
Thanks.
6:56 Left turn day on Base. IYKYK
This is what you get by wanting radio device to be 'without antenna' making it yell in every direction, mostly into soil, body and aliens in the sky.
In this case it is important that it transmits everywhere, so even if the radio is at a weird angle it can still reach a satellite or a ground receiver
@@dereksgc aliens be happy ;-)
od kdy jseš čech? až teď jsem si všiml..
Meteor-M2 is still working?
Not anymore, hopefully N2-3 launches soon
fingers crossed it launches successfully
It's up and working. "saveitforparts" has a video of decoding the weather pictures.
Cool
These voice sounds like illegal repeaters used by taxies or trucks in Taiwan,LoL.
"There are voices . . ."
Chinese talking in hokkien language on the radio transmittion! 🤣🤣🤣
Thunderbird 5
binternational rescue
SRD dongle a lap top or mobile phone thats all you need .
Homeboys sayinf K7S5A CQ
GPS trasmitting Audio 😂😂😂 SUSPECT
...Recalculating...
Wish I was in Tijuana....
Eating barbecued Iguana.
🎸🎶😎✌️
First voice sounds like Portuguese.
Toilets in space. Come on man.
So delete the upload and render it again.
rick rolling on sats?
Think about Geo static. Rocking Earth on its polar axis. Where it static, still? Only within central area. Edges are affected by wobble of Earths spinning mass, up and down as its rotating. Like a top as it goes out of spin energy, wobble like Jet stream comes into effect. It can’t fall over to anywhere it’s in a controlled field of influence of the Sun. random dips and stuttering anywhere on the globe.
Weather and many confused sea creatures, unexplained , sudden, non tidal, Waves of sea, even ponds, by the rocking stop and reverse. Plane in flight optically , stopped , 1 1/2 minutes and continued at excess speed. Not the plane, the Earth surface observer saw it as , not them . Can a plane stop, for a minute and a half in transit in the sky? Obviously not.
Sounds like they're speaking Chinese
Starlink will probably replace this system, being low earth orbit the transmission doesn't't have to have as much power and 2 way communication would be easier.thet already working with T-Mobile to use Starlink for coverage. I'm sure Elon is already working on a civilian SOS system. It might even replace Onstar, it's funny years ago people thought OnStar worked thru the satellites they had no idea it was dependent on analog cell towers. I have it in My 01 GMC Yukon but OnStar will never work in that vehicle again because it was analog only and no analog towers are working in the USA today. GM won't provide upgrade for the Cellular Transceiver that's in the dash for anything made about 2005 and before for some reason. The Onstar call center didn't even know this when I tried to activate it? I purchased it a year after Analog was turned off in the USA. Anyway as long as Starlink keeps growing it will replace so many satellites probably even Video service, can you imagine getting live TV anywhere on earth thru the same company? I have Starlink on my RV I use.it to stream TV because DirecTV and Dish network are insanely expensive for the few months a year I use it. And they are really shady when you buy Mobile hardware (Yes you have to Buy Mobile specific equipment) once you activate it it's no longer yours you must send it back to them if you cancel service. Because they treat all equipment the same? I won't feel sorry when technology like Starlink makes them obsolete 😊 sorry for the rant I grew up in a different time when if you purchased something it's yours forever.
Starlink is a private company, this is an international governmental effort, a service provided for free hosted on the nation's own satellites. Same argument could be used for Iridium which already exists for many years and offers global phone coverage, but they aren't included in the SARSAT emergency system
Microwave auditory effect.... Synthetic telepathy as the US Army called it.
Thanks satellites!
Yes they are saying do not come to planet earth full of evil people
This frequencies are allocated for search and rescue usage worldwide so this are certainly people illegally using those frequencies for their two way radios.
See the pinned comment, it most likely is some overlapping allocation in a country like China. I'm sure some traffic is illegal, but I would even say most seem to be unintended
Nice video RAFIQUE MASTOI DG Khan Pakistan 🏝🇵🇰🇵🇰🇵🇰🇵🇰🇵🇰🇵🇰🇵🇰🇵🇰🇵🇰🇵🇰🇵🇰🇵🇰
Bruuuuughhhhhhhhhhhhh
either I love huffing lead from melting batteries and eating cadmium when oil painting to relax and too drink to watch the hole thing but - *this guy is like gengss kan... we all wish his DNA was in our blood line cauer be is as dope as a full bridge teditifirr dax*
They can target u and hear what you think , when someone with morals and able so bad for good gets ahold of this the other side is screwed
The f
Bwahahahhahahaha! Stop the comedy routine. Its probably just a base station some place. Satellites eh? The kind that orbit Uranus.
Haha that's a really funny joke, that must have taken you a real long time to come up with.
Now please explain to me exactly how the base station in this "some place" works and provide the same kind of detail I did in the video. Thank you :)
@@dereksgc horrendous flatulence, i barely read your reply.
Hahaha what utter nonsense
elaborate please
@@dereksgc Firstly, do you confirm you actually believe satellites exist? As an expert upon said narrative, can you then explain how they are held in position as the supposed earth spins at 666,000 MPH? Thank you.
@@chaseshadow Absolutely. Above a certain altitude atmospheric drag can just be ignored, so the only force acting on a spacecraft is Earth's gravity which will constantly try to pull it down. If you go sideways this downwards pull will instead end up curving your path, think of a thrown dart. Go fast enough and you will be able to get into a stable orbit, with its period (aka how long it takes to complete one rotation) given by Earth's mass. At low orbits you need to go faster, at high orbits you need to go slower (because you have more "time" to curve). At around 42 thousand km altitude one orbit takes 24 hours, which happens to also match the time it takes the Earth to rotate, so from your point of view the spacecraft remains stationary, even though it is still traveling around the planet at almost 7000 mph. There isn't any "magic" holding it in place, in fact this orbit is unstable on its own and any satellite that wants to remain "stationary" needs to often correct its position using thrusters. When the fuel runs out it "falls" out of this orbit.
@@dereksgc Thanks for your response. You are completely incorrect in my believe based on other knowledge. Powerful isn't it . . . . Belief. Do you think it's easier to fool someone, than to convince them they've been fooled?
@@chaseshadow I'm open to learning new things. I told you my take and now I would like to hear your explanation of how it is possible that I can receive signals coming from these spacecraft that behave exactly as described. If it can be proven I'll be the first to admit I was wrong and will make a video about it
all i can hear is your mouth all oer this video what about letting us hear for a while.
yeah well sorry about that, but considering the nature of these radio signals I think that should be understandable
Bit rude of a comment after all this is his channel! You could always set up your own equipment and listen all day and night till your hearts content🙄
@@Jimmyboy1674 lol who r u the internet police kiss my royal ass.
Wow, harsh.
"some" satellites or dish antennas , not "a bunch of". They aren't flowers or keys... You use "bunch" to describe a number of things, typically of the same kind, growing or fastened together.
Grammar Alert! ..... There ARE voices , blah, blah blah.
Sorry. Currently boycotting channels who can't be bothered to get their grammar correct.
Hint: IS is singular. ARE is plural.
I suppose, that author is not a native speaker (me to, hehe). So, we should be more tolerant. ;)
i currently boycott and block those people taht have nothing to say but ranting about grammar :x love and peace.
@@Raketenclub Gosh. I have a lot more to do than (not a) rant about other peoples' grammar,, like walking and chewing gum at the same time.
That said, I have little respect for those who can't handle a little constructive criticism.
This was a test.
@@TheGhungFu Quite a harsh stance given the speaker is a non-native speaker, but his content and effort is commendable.
Go away
Pringles can,.. refrigerator. 🎉 Take the supports out of the back of a hood of vehicle and you got another reflector under the transponder