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Ordinary Satellite Ground Stations cost millions. We will build one for 20 dollars for the newly launched LoRa satellite. Let’s build it in parallel to the launch of the Electron spacecraft from Rocket Lab. Will it be successful? In my last video, I announced that the 16-year old Julian Fernandez and a small team built FossaSat-1. We will accompany the launch and in parallel, we will build a Ground Station and test it with the real satellite. Will it work?
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Links:
Fossa Systems: fossa.systems/
Donations here (for the next one): www.gofundme.c...
Ground Station Software: github.com/G4l...
TLE File: drive.google.c...
Sensor Software (experimental): github.com/G4l...
Gpredict Download: gpredict.oz9aec...
Join Telegram group: t.me/joinchat/...
Get MQTT credentials after test phase): forms.gle/3Mm7...
Map of stations: fossa.apaluba....
Discord Channel for support: / discord
For the moment, the TTGO boards seem not be supported by the satellite. Better use an ESP32 and this board: s.click.aliexpr...
TTGO 433MHz board: s.click.aliexpr... or bit.ly/2RzzTSZ
RFM95 433MHz: s.click.aliexpr...
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Supporting Material and Blog Page: www.sensorsiot.org
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Опубликовано:

27 сен 2024

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Комментарии : 470

@AndreasSpiess 4 года назад

The satellite currently is not working properly and cannot be reached with small antennas. Also the TTGO board shown in this video currently seems not be supported. Look at the alternative in the description or follow the Telegram stream.

@DIYJase 4 года назад

Andreas Spiess thanks for you videos on this fantastic project. How great that fossa achieved this. I would love to be involved in something like this. Andreas perhaps you might lead a community project? I would be happy to get involved. Cheers

@MuertoChango 4 года назад

If you are using it legally... as a HAM operator... you can use up to 100s of times the transmit power...

@shashibhushan5418 3 года назад

Dear Andreas Spiess sir I am really a fan of yours but if you don't mind the way you installed the antenna at (12:12) in video you will never going to receive any signal from space due to polarization issues. I hope you would next time make a short video may be part 2 while receiving . I would suggest to use 2 TTGo module, 1 module antenna in vertical and another in horizontal position in reference to earth poles. Standing dipole antenna wont work, I think we should give one more try. Please !!! Thanks in advance :)

@albertbu97 3 года назад

Can you post a link to the telegram please ?

@MrArtVein 2 года назад

@@shashibhushan5418 I'm just learning about this, but I understood what you wrote from my studies in microphone recording. You're saying his antenna will null

@FossaSystems 4 года назад

An update for everyone here: FOSSASAT-1 is shown to be working correctly and healthy. However, due to the antennas not having deployed, the signal is very weak and can only be picked up with large antennas. LoRa remains not functional for small stations due to this. We are working to deploy the antennas manually from earth and hope to fix the issue. We are also launching two more LORA satellites in march to expand the network :)

@Conservator. 4 года назад

Fossa Systems Too bad the antennas haven’t deployed (yet!) but still a fantastic success. I believe Fossasats will have a tremendous impact on the world in general and the world of IoT especially. Congratulations!

@cfeigel 4 года назад

I'm a child of the "space race". My father worked on the Saturn-V rocket in the 1960s. Seeing the renewed interest in space exploration makes me grin like that little kid of fifty-odd years ago! My congratulations to you and the team on your accomplishment! People all over the world are watching and getting excited. This is how it all begins!

@GRBtutorials 4 года назад

Cool! However, won't the satellites eventually fall back to Earth due to air friction? I've seen other CubeSat projects and they all seem to last for only a few months before disintegrating.

@SteveWrightNZ 4 года назад

Was the tape antenna held down somehow? I assumed it self-released once ejected from its' container..

@linagee 4 года назад

Is there a sensor to know for sure if the antennas deployed correctly or not? Maybe on the next version! :-) (Would a small vibration motor also be a good addition to solve this sort of "jiggle it loose" problem?) Edit: Ah, I see on your latest post, solar voltage can indicate if the panels were correctly deployed.

@Stoneman06660 4 года назад

This is brilliant. Thanks, Andreas, for covering it otherwise I'd have been completely unaware!

@AndreasSpiess 4 года назад

That is one of the purposes of this channel...

@minepro1206 4 года назад

Me too

@anandmoon5701 4 года назад

Good initiative by young scientist, and many thanks to you Andreas for explaining the logic behind the operation. you have made this complex concept much simple to understand.

@AndreasSpiess 4 года назад

The project deserves my support!

@HighestRank 4 года назад

There’s a hoLe in the operation, which explains the probs and low-power mode!

@myounges 4 года назад

Thank you Andreas for your efforts to teach and share all this information!

@AndreasSpiess 4 года назад

You are welcome!

@CraigPerry 4 года назад

Andreas - when working amateur satellites on the 70cm band with a simple whip antenna from a handheld, i use a whip that’s around double the size of the one shown. Also i have to hold it at an angle and i have to change angle as the satellite passes. If 0 degrees means holding it perfectly vertical and 90 degrees means horizontal, then for best reception i need to hold it at around 15 degrees to acquire the sat as it comes above the horizon then over the next 6 minutes or so i have to follow its trajectory over the sky, keeping the whip antenna pointing perpendicularly at the sat. You probably know all this already but i mention it because a purely vertical orientation is really hard to make work at higher powers so lora powers i expect even more trouble (although lora’s far better sensitivity should help offset this but not sure by how much)

@AndreasSpiess 4 года назад

LoRa promises a very high link budget which should enable sensors with simple and fixed antennas. Otherwise the whole concept would be useless... There are other people with big yagis in the project, I am only interested in the sensor use case.

@david3810 4 года назад

Impressing! Try turning the antenna 90 degrees. The sensitivity is probably donut shaped

@AndreasSpiess 4 года назад

The satellite usually passes in the N-W-S or N-E-S. Hardly ever at 90 degrees

@ToDoNoHarm 2 года назад

For anyone looking at this in 2021 or later, the FOSSASAT-1 (Norad CatNum 44829) was DECAYED on the 28th day of October in 2020. It is no longer operational.

@AndreasSpiess 2 года назад

Unfortunately, this satellite was never operational because the solar panels and the antenna did not unfold. But there are other satellites. Maybe you search for "tinygs", a project which evolved out of this satellite launch...

@chris.b83 4 года назад

damn, how cool ist that "finger stick" :D

@AndreasSpiess 4 года назад

The original is from my wife's stock. She was a teacher in the 1990 when those were quite common.

@lintangwisesa 4 года назад

Great story & super clear explaination, Sir. Thanks a lot.

@AndreasSpiess 4 года назад

You are welcome!

@DD0ULQTC 3 года назад

Exciting like a thriller. Now I'll look for how it went on.

@AndreasSpiess 3 года назад

Recently they upgraded the network to tinyGS (you find a recent video about it)

@macieksoft 2 года назад

Ballistic coefficient (BC) is usually defining how much drag is the object generating. On LEO satellites are subject to the orbit decay based mainly on drag, there is still a little bit of atmosphere up there. BC is often used in ballistic calculators because different bullets have different shape and they generate different drag.

@AndreasSpiess 2 года назад

Thank you for your information!

@electronic7979 4 года назад

Very good video 👍

@AndreasSpiess 4 года назад

Thank you!

@metalpachuramon 4 года назад

Wow! That's awesome, I didn't know that there were these kind of satellites for people to experiment with

@AndreasSpiess 4 года назад

This is the first of its kind which should enable cheap sensors on earth

@volkinaxe 5 месяцев назад

hope they make more of these

@AndreasSpiess 5 месяцев назад

There are quite a few satellites up now.

@volkinaxe 5 месяцев назад

@@AndreasSpiess is there any info like a website that shows there orbit also hi from new Zealand

@volkinaxe 5 месяцев назад

up date i was hoping this was meshtastic i will wate intill this is set up as a setting on it

@AllanKobelansky 4 года назад

Nice work. With such interesting stuff you present, I’ll never get any domestic chores done.

@AndreasSpiess 4 года назад

Nice excuse ;-)

@TheBodgybrothers 4 года назад

You'll need some directivity on the antenna to avoid out of band rf causing input desense. Use a dish antenna instead.

@AndreasSpiess 4 года назад

Then we would be back to standard satellite technology, I think.

@otm646 4 года назад

@@AndreasSpiess It's only the antenna not the hardware, protocol or spirit of the project. I understand why you want to use a standard antenna but if you continue to not receive a signal switch to a dish, this micro satellite won't last long. I'd rather see you succeed using a dish than be unsuccessful with a standard antenna. Your potential success would be a huge boost to the LoRa community.

@AndreasSpiess 4 года назад

There are people with big antennas helping Julian to fix the problem.I hope they will be successful. Then I can try ma small antenna...

@TheBodgybrothers 4 года назад

Just stick your antenna in a wok. 🤣

@alexandrecoste1190 2 года назад

Hi Andreas, i see FossaSat-2E1 has been launched and it could be very nice to update your video and see how its moving now. Thank you so much. Happy sunday.

@AndreasSpiess 2 года назад

Currently there are 6 Fossasats in the air and I receive some of them regularly...

@alexandrecoste1190 2 года назад

@@AndreasSpiess Hi sir Andreas, Thank you for your quick answer. did you success to send packet by Fossasat finaly ?

@HolgerBarske 4 года назад

Amazing adventure. I hope this going to deliver results soon 👍.

@AndreasSpiess 4 года назад

Me too...

@Conservator. 4 года назад

I’m still trying to find the TLE for my test Arduino Pro Mini and RFM95 . . . Now on a more serious note: Andreas: this is the first time you managed my heartbeat really sped up this is the first time while watching your video. I really felt the tension when you reported on the failed communication attempts at the end. I vigorously hope Fossa will wake-up in the near future. Otherwise, we’ll just have to wait for the next one(s!) to be launched. What an exiting project.

@FossaSystems 4 года назад

We are healthy with some packets recieved! Still hoping to deploy antennas :)

@AndreasSpiess 4 года назад

I hope you found the link to the TLE file in the description...

@Conservator. 4 года назад

Andreas Spiess For the simulator?? I’m sorry, I thought that would be funny.

@freedom2000 4 года назад

Excellent video Andreas. I really hope that this sat will work quite soon (I'm into space business as well (LEO sats :-))

@AndreasSpiess 4 года назад

We all hope, I think. But learning takes place in both ways...

@bramv1984 4 года назад

Thanks for the excellent video again! You show two Baofeng radios, the UV-5R and (I presume) the UV-82. Do you prefer one over the other? :)

@AndreasSpiess 4 года назад

I do not use them often. So I have no opinion.

@jamesdriscoll_tmp1515 2 года назад

Have you had enough time to form an opinion?

@luwang404 4 года назад

The efforts need to be appreciated at least whether the signals are strong or weak or even lost.

@AndreasSpiess 4 года назад

We still can hope :-)

@joeynovak07 4 года назад

Wow!!! Sooo cooool!! Thanks for posting this.

@AndreasSpiess 4 года назад

You are welcome!

@AA-gl1dr 4 года назад

i’m so glad i just found this

@AndreasSpiess 4 года назад

:-)

@brainfornothing 4 года назад

Very interesting. Thanks for sharing !

@AndreasSpiess 4 года назад

You are welcome!

@WILLMARFERNANDOROMEROMARIN 3 года назад

Greetings from Colombia, How is it possible for a LoRa to have sufficient range in distance?

@AndreasSpiess 3 года назад

Maybe you watch my videos on LoRa. You find a playlist on the channel.

@tommihommi1 4 года назад

a tape measure antenna on a Satellite, I never thought I'd see the day

@AndreasSpiess 4 года назад

This is very common. The material is perfect and cheap...

@tommihommi1 4 года назад

@@AndreasSpiess I've built Yagis from it myself, but didn't expect it to be used on satellites. But it makes sense, as you say.

@NoviSavvy 4 года назад

It is a perfect reliable material for satellite antenna as it is easy to fold and extend it

@AndreasSpiess 4 года назад

Look also at the 50$sat

@gurudattapanda 4 года назад

Yes, the material used for measuring tape is an alloy having perfect elastic property to be wound up in a satellite and open up to form an antenna after the kill switches has been released after launch.

@IndianTinker 4 года назад

That hand !!

@AndreasSpiess 4 года назад

As always!

@fanest_norfar 4 года назад

I just hope that these small satellites are designed so that when they expire quickly fall down so that they don't litter the space.

@AndreasSpiess 4 года назад

That is the case.

@fanest_norfar 4 года назад

@@AndreasSpiess I'm not sure if you are aware of this but latest Starlink satellites are causing quite an uproar in astronomers community, because when a group of these satellites shows on the night sky they completely destroy images of telescopes. Maybe these much smaller satellites are a way forward.

@crckdns 4 года назад

At first glance the idea is great and I hope it will work out as they hope! Yet, for me the satellite cube shown doesn't look like space ready. Also I doubt they invested a lot of needed money and time for hardening against the space radiation.

@Conservator. 4 года назад

crckdns Hi Edit2: there have been quite a few successful connections reported on Telegram! Edit: having watched the video again and noticing the background at which Julian is filmed, I assume they tested the real satellite for these things. AliveC4T mentioned that too. And also that non-leaded solder would breakdown at temperatures below -10°C. Could you elaborate on both? I would be surprised if the team weren’t warned for this and wouldn’t have done any testing for these environments. I’m just thinking out loud here. I’ll appreciate any comments from you (and anyone else).

@FossaSystems 4 года назад

The satellite has various protection systems and circuits against single event upsets and latchups, we have tested it in thermal vacuum chambers. So far it is healthy in space although the antennas have not deployed.

@Conservator. 4 года назад

Fossa Systems Thanks for the update and congrats. Even without the deployed antennas still a huge success as far as I’m concerned!

@codebuster2716 4 года назад

Hmmm, very interesting. I probably need to buy public liability insurance before I start my own project. Who knows, my Satellite might mulfunction and knock someone out leading to an expensive lawsuite.

@AndreasSpiess 4 года назад

Maybe the litter of the rocket needs more insurance as it can hurt somebody on earth ;-)

@aleksandersuur9475 4 года назад

A cubesat reentering Earths atmosphere brings to mind the phrase "snowball's chance in hell". And as cubesat operator your maneuvering options are limited to differential drag at best, therefore you basically have no responsibility over any possible collisions your satellite might have, because it's completely out of your control. You don't even get to really choose where your satellite will be released, at best your choice is with which rocket you want to ride along.

@pulesjet 4 года назад

No License in hand but I should be able to at least catch the Beacon using my SDR ( Software Defined Radio ) and a simple Helical Antenna. Good Luck Attempting to deploy the antenna Sir.

@AndreasSpiess 4 года назад

Good luck!

@pulesjet 4 года назад

@@AndreasSpiess San to hear the Antenna failed to deploy, eaa?

@AndreasSpiess 4 года назад

Yes :-(

@pulesjet 4 года назад

@@AndreasSpiess Have they managed to get the antenna to move? Figure out what didn't happen. Guessing something expanded due to cold temps and bound up ?

@AndreasSpiess 4 года назад

They discuss the details in the Telegram group. I do not closely follw...

@SianaGearz 4 года назад

Reminds me of a satellite by demogroup TRSi which is set to broadcast a Commodore-64 demo "10 Orbyte" which can be received with a Realtek DVB stick used as SDR.

@cheaterman49 4 года назад

Wait what? o__O how did they get the funding?

@SianaGearz 4 года назад

@@cheaterman49 Difficult to say to what extent it's self-funded or to what extent it's a university collaboration (RTWH Aachen), i don't remember this being spoken about. The costs aren't astronomical, excluding personal labour, they have to be within like 2 dozen grand in material and external costs, because the sats are so tiny, like only 5cm across. If you want to look up the guy, the name is Paul Kocyla and that was back in 2013-ish and he has launched 2 other satellites since, all bearing TRSi naming or content.

@cheaterman49 4 года назад

@@SianaGearz Oh wow that was much more recent than I was expecting, that's also why I expected much higher costs (price of house instead of price of car in this case). When you said demoscene I was expecting 80's stuff :-) but yeah if it's a pocket sat the cost is reasonable (in the same ballpark as FOSSASAT-1). Will definitely look it up, thanks for the info! EDIT: If anyone is interested, I think this is the video to watch: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-enqrZj6oTC0.html

@lib0r 4 года назад

Excellent video!

@AndreasSpiess 4 года назад

Thank you.

@SchoolforHackers 4 года назад

This is how we build freedom. Bravo.

@AndreasSpiess 4 года назад

:-)

@VincentFischer 4 года назад

Wow these things are tiny. I know cube sats were tiny but this thing..! I wonder how durable this is, exposing pcb and hobby grade components to space

@AndreasSpiess 4 года назад

Maybe you go to www.50dollarsat.info/ ? It survived quite a while

@MrFatjonable 4 года назад

I'm now sitting on the first row!!

@AndreasSpiess 4 года назад

Welcome aboard the channel!

@Caffein780 4 года назад

Brilliant!!

@AndreasSpiess 4 года назад

Thank you!

@wayne6220 4 года назад

Thank you for your amazing video.

@AndreasSpiess 4 года назад

You are welcome!

@imranrajjad7028 3 года назад

I wonder we could see what kind of Antenna would be suitable for communicating with this satellite, maybe a Video?

@AndreasSpiess 3 года назад

We will see. They have new satellites planned...

@kslog954 4 года назад

That notification sound @1:13, distracted me for checking Telegram :D

@AndreasSpiess 4 года назад

:-)

@n0madfernan257 4 года назад

hi, this is interesting. thanks for this.

@AndreasSpiess 4 года назад

You are welcome!

@dexterkhm 4 года назад

From Fossa telegram channel i discovered that now only SX1268 is module suported by satelite. TTGo and other modules will not work.

@v-king936 4 года назад

Trying to hook up my SX1268 to an ESP32 today, since i'm not aware of any existing boards combining the two... (unless we use Jan gromes' RadioShield with its SX1262 module on an ESP32 in Arduino-layout ??) I'll let you guys know!

@AndreasSpiess 4 года назад

That is what I read, too. But also that the satellite is not usable for the moment

@v-king936 4 года назад

...too bad for my 3 setups (TTGO's and Heltec's v1 with SX1276 connecting successfully to the MQTT-server with the fantastic sketch by G4lile0, and Adafruit Feather M0 + featherwings Oled and Lora455 also based on SX1276, the latter one only running the test script on Fossasat's Github since M0 is SAM21 based and cannot run ESP libs)

@bababoey3315 3 года назад

20 $ is the price to send the satellite on space ?

@AndreasSpiess 3 года назад

It is the price for the ground station as the title says.

@jamesallred2970 3 года назад

I so enjoyed this ❤️❤️

@AndreasSpiess 3 года назад

:-)

@g.s.3389 4 года назад

I would be surprised if this would have worked for the lack of satellite expertise of who did this. There is the most important thing that they did not consider: satellites electronics have to fight with radiations, that is why all the satellites are (a) shielded), (b) use military electronics. You will never see an intel i7 or any consumer grade processor in the Space. It was a good idea, but they shoud have got expertise from people that does it professionally. The projects with raspberry that they did on ISS worked just because it was inside the ISS which is already shielded.

@AndreasSpiess 4 года назад

I am no expert. But Musk in his biography said, that he requested SpaceX only use commercial grade components to save money. This is what he called „innovation“

@FossaSystems 4 года назад

Incorrect, COTS electronics are successfully used on thousands of satellites in space, as Andreas says all the spacex hardware is COTS! It can also be made radiation protected, in fact we have dozens of protection circuits against radiation Single event upsets and latchups

@lucabertagnolio9166 4 года назад

Giuseppe Suanno not true. The whole Microsat movement started by amateur radio in the 1980s made building cheap LEO satellites using normal commercial-off-the-shelf componets possible. It then became the huge nanosatellite revolution of the 2000s, with more than a thousand cubesats of all sizes launch into LEO. LEO means that at most a satellite will have a few years of useful life, so even if it fails, you only lost relatively little money. Radiation in LEO is relatively low, the problem start to be important in orbits above 1000km.

@Conservator. 4 года назад

Luca Bertagnolio That’s interesting to know. Tx!

@g.s.3389 4 года назад

@@lucabertagnolio9166 Designing for space is much more complicated than designing for standard electronics. Electronics for military, avionics, and aerospace are crafted to withstand the extreme temperatures, vibration, shock, and radiation effects commonly encountered at lift-off and outside the earth’s atmosphere. Temperatures vary along a wide range from -55°C to +125°C in space. Not exactly COTS components, unless your components can manage those exrtremes.

@silvioalvim 10 месяцев назад

I don't quite understand the purpose, I apologize if I'm being too newbie, but would it be possible to send data between two very distant ground stations using one of these satellites as a bridge?

@AndreasSpiess 10 месяцев назад

This could be made. So far, I only know commercial small satellites that do it.

@Berilium65 4 года назад

You might want to try a circular polarized high gain antenna.

@AndreasSpiess 4 года назад

This system is for sensors. If these need high gain antennas, it will be worthless.

@johnwashell4351 4 года назад

@@AndreasSpiess Not necessarily, you still have to wait for the satellite to be near over head, so store and forward, isn't the worst idea. With your whip antenna, you have a deep null looking up, as the pattern is donut shaped, and neither receives nor transmits in the up direction. If you can get info on the sending antenna such as linear or circular polarization, you can optimize your link quite a bit. You could also try mounting your antenna horizontally, and add a reflector 1/4 wavelength below it to get 3dB of antenna gain.

@johnwashell4351 4 года назад

@@AndreasSpiess The link budget is a bit tight for hobby grade links. The expected path loss is -153.3dB. It doesn't say it has a dipole, but seems to imply that with the antenna gain spec. With the sat floating in space, there is no way to determine its angle to the earth at any given time. It you use a linear polarized antenna, you could still be cross polarized, and lose 30dB of signal. A helical or two yagis phased in quadrature would be the way to go. Although these can be high gain, they can still have enough sidelobe to communicate terrestrially to other lora nodes.

@hopje01 4 года назад

If this sat is tumbling around in space, I would think you get a lot of up/down link signal fluctuations?

@PhG1961 4 года назад

Amazing !!

@AndreasSpiess 4 года назад

Indeed!

@cmuller1441 4 года назад

STATUS: FOSSASAT-1 IS TRANSMITTING AND HEALTHY BUT ANTENNAS HAVE NOT BEEN DEPLOYED - RECEPTION ONLY POSSIBLE WITH HIGH GAIN ANTENNA USING RTTY

@AndreasSpiess 4 года назад

You are right.

@johng7rwf419 4 года назад

Very interesting...

@AndreasSpiess 4 года назад

Thank you!

@ikokovidis56 4 года назад

Well done Andreas ... Very interesting project 73 DE SV2LLJ IOANNIS

@AndreasSpiess 4 года назад

Thank you! 73 de HB9BLA

@cliftonbrown911 4 года назад

I want to build a duplicate of the LoRa relay station contained in the satellite, does the code on Github provide me with all the code to do this? I know we're not supposed to build LoRa repeaters so I will be using the amateur band frequency.

@AndreasSpiess 4 года назад

Please read my pinned comment first and join the telegraph channel

@cliftonbrown911 4 года назад

Andreas, thanks for replying so promptly. I've read all the comments on both of your videos on the subject and tried to understand how to navigate telegraph (unsuccessfully), have looked over the Github post but I'm still a bit unsure if the code to build the LoRa relay is contained in the Github code.

@AndreasSpiess 4 года назад

Just press the telegram link in the video description on a PC and you should get to the instructions...

@cliftonbrown911 4 года назад

Andreas, thanks again for your reply. As I initially stated, I've looked through telegram from the beginning, the FOSSA website and Github. I don't see anyone explaining how to build the Relay station, not the Ground station. Lots of information on building the ground station but nothing on building the relay station. Thank you and all the Holiday good wishes to you.

@AndreasSpiess 4 года назад

The idea is that a sensor transmits it’s message to the satellite. There it is repeated to a ground station which is connected to a MQTT broker. Your application can then subscribe to a topic of your sensor on this server and gets the message.

@nathanw851 3 года назад

Is FossaSat-2 still scheduled for Jan '21?

@AndreasSpiess 3 года назад

I do not know.

@GRBtutorials 4 года назад

5:20 Well, I'm no expert either (yet), but it looks like to me that the first derivative refers to infinitesimal calculus, where the first derivative indicates the rate of change at a point of a function, and the second derivative is the derivative of the first (so for example, the first derivative of the position is the speed, and the second derivative is the acceleration). Mean motion, after some research, seems like it's just angular speed (the angle covered per unit of time). "Aka" means "also known as", so the first derivative of mean motion is also known as the "ballistic coefficient", just a fancy name.

@AndreasSpiess 4 года назад

I understand the words, but not the meaning ;-)

@GRBtutorials 4 года назад

Andreas Spiess I believe this has to do with the characteristics of the orbit. As you might know, orbits aren’t perfectly circular but elliptical, and I think that’s what it means from what I’ve gathered and what I know from calculus. Would need to do further research to say for sure, though...

@w42ren 4 года назад

Come on its not rocket science oh!!!

@science4allworld587 4 года назад

Thanks i have been following fossa.. but no signal.so far in Nordic countries...

@FossaSystems 4 года назад

Only RTTY with yagi antennas working so far,

@GreatNerve 4 года назад

Does sound wave travel in plasma?

@AndreasSpiess 4 года назад

I do not know

@ivanrodionov9724 4 года назад

hmm depends on the conditions and what frequency and what plasma, i know for a fact a hot plasma in an arc can be pulsed or modulated to play back audio because i have done it, but in a more abstract manner maybe, as technically a radio wave can be a sound too because a varying charge is created. long story short, this is a topic worthy of a thesis...

@ElvisCompost 4 года назад

Andreas, you say that FOSSA uses 436.7MHz but the TTGO & RFM95 boards in your links are 433MHz. How are the frequencies converted?

@AndreasSpiess 4 года назад

The TTGO can handle this frequency.

@linagee 4 года назад

The manual on RFM95 says a "433Mhz module" can actually be tuned from 410Mhz to 525Mhz. (Obviously you have to be aware of the correct licensing and power requirements to transmit on whichever band you're tuned to. Also, your antenna should be optimized for the frequency chosen.) Page 13: cdn.sparkfun.com/assets/learn_tutorials/8/0/4/RFM95_96_97_98W.pdf

@ElvisCompost 4 года назад

Thanks for the information. I had no idea that the TTGO could handle such a frequency range.

@josephmartinelli97 4 года назад

I use Gpredict 2.2.1 updated but, when I want to create a new module, in the list, there is no Fossa satelitte ... I found FO-29 ; 98 ; 99 ; FORMOSAT-3 FM1 to FM6.

@AndreasSpiess 4 года назад

There is a link to a TLE file in the video description

@TheTinkerDad 4 года назад

Andreas, you should really think about changing your intro text to "Here is the scientist with the Swiss accent."

@AndreasSpiess 4 года назад

I am an Engineer with my full heart. Science would be too boring for me ;-)

@TheTinkerDad 4 года назад

@@AndreasSpiess I understand, but still - I've been a long time follower of your channel and from basic stuff like how to use an ESP8266 you've come to things like how to track and connect to satellites, etc. :) It's way more than electrical engineering to be honest! Also, thanks for creating one of the most extensive and easy-to-follow video collection about LoRA and related projects!

@AndreasSpiess 4 года назад

I follow my interests. Often there is a hint of wireless included.

@davidmiedema2950 4 года назад

We should Elon Musk, nicely, if he can backpack one of these onto each of his starlink sats.

@AndreasSpiess 4 года назад

:-)

@alpborakirte801 2 года назад

I need to transmit a 300 kb data from ground station to a model satellite and transmit that same data to another station with different frequency. I was using Xbee for only send the data to model satellite but now that i had to send it to another station i was wondering if i can do that with Lora. There are different infos about it's bitrate but is 300 kb data large for Lora ? Also i have a Madunio Lora Radio and it has ATMega 328p microcontroller in it they say it's bitrate is 300 kbps but it's range is 2km. I wonder is there some other Lora modules with higher bitrate and higher range?

@AndreasSpiess 2 года назад

Range and bitrate do not come tother. They come "either-or" (with the same power). You have to check the highest bit rate LoRa chips support. I do no know it by heart because we usually do not use high data rates (we like the long range more)

@raghavsrivastava2910 4 года назад

Hello andreas. 16 year old here in India .I cannot find FossaSat-1 in the database after updating,as of 22 May,2020. Is the mission over?

@AndreasSpiess 4 года назад

Maybe you join their telegraph group. The Link is in the description.

@raghavsrivastava2910 4 года назад

@@AndreasSpiessOk. Thanks a lot.

@ginogalimberti2847 4 года назад

HAMMER! 👍✌️😎

@AndreasSpiess 4 года назад

Danke!

@shrine010 4 года назад

Does it work already?

@AndreasSpiess 4 года назад

I do not think so. Maybe you join their telegram group?

@Cptnbond 4 года назад

Hi Andreas, great stuff, I will definitely try this out, just for fun. Would it not be good to improve the ground-station antenna system to improve our chances for sat communication?

@AndreasSpiess 4 года назад

There are others with bigger antennas. I do not have one. Bu I also do not want a bigger one on my future sensors...

@rkan2 4 года назад

I think usually you only need to pay for liability insurance when launching.

@science4allworld587 4 года назад

I wonder do i need any SDR etc to get info from fossa via lora board? How do i know when i get signals from Fossa?

@AndreasSpiess 4 года назад

By listening the frequency using a LoRa module

@TheLollisoft 4 года назад

Why don't they use an ISM band as well? I am experimenting with LoRA here in Germany and this would be exiting.

@AndreasSpiess 4 года назад

From space, the ISM band is quite crowded and in this case, the receiver would not hear anything

@linagee 4 года назад

Because there is a specific band for Amateur radio satellite. en.wikipedia.org/wiki/Amateur_radio_satellite#Additional_allocations

@JohnTarbox 4 года назад

Andreas, would you please post a status update on this project?

@AndreasSpiess 4 года назад

You get the updates on their telegram channel. The satellite is still not available for the general public because its antenna is still not deployed. So we have to wait for the next one in spring.

@sanjaymistry-sales 4 года назад

Hi Andreas, (I'm a big fan of yours). Anyways, is there any update on LoRa satellite?

@AndreasSpiess 4 года назад

Maybe you join their telegram channel? There you should get the news.

@AdityaMehendale 4 года назад

Grutti Andreas! What would be the best orientation of an antenna when trying to connect to something at 500km up? Would it be worthwhile to tilt the antenna depicted at 12:10 to prevent a "blind-spot" directly overhead? Obviously, the radius of "footprint" on the world-map is more that 500 km, so the satellite wil mostly be at

@AndreasSpiess 4 года назад

The satellite is nearly never overhead. To also not exaggerate the directivity of a dipole. It is only a few dB. The first passes were in the East and west.

@shareefind 4 года назад

As per lora-alliance end device requirements for certification is required frequency is 865-867 in India, so please let me know can I use 433Mhz device for fossasat-1, as u have suggested?

@AndreasSpiess 4 года назад

I do not know the law in your country.

@suisse0a0 4 года назад

Why I'm a watching this :'( I want to build a Lora gateway and ground station so bad!

@AndreasSpiess 4 года назад

Maybe you wait till the thing works ;-)

@ZamanTurja 4 года назад

Thanks a lot sir, helped me a lot

@AndreasSpiess 4 года назад

You are welcome!

@robertoshannessy1389 4 года назад

Hi there, is it possible to make a geostationary satellite with Fossa or with a Cubesat?

@AndreasSpiess 4 года назад

I do not think so. Fossasats are at 500 km max and Geostationary satellites are on 36000km. I did a video series where I communicated across a Geostationary satellite (QO-100)

@LeonardoBaracat 4 года назад

Hi Andreas, great video. Excelent subject coverage. I was wondering if you could help me with gpredict. I installed the software via linux repository and updated the TLE info. Everything is working like a breeze. But I couldn't find the sats (84001,84002 and 84003). Did you make any customizations/settings? Pointing to any new TLE source, for example... Thanks in advance, Baracat

@AndreasSpiess 4 года назад

You need to load the TLE file I provided in the comments.

@freelancer917 4 года назад

Are we allowed to transmit LoRa packets on 436.7MHz even as Amateur Radio Operators? In Switzerland the rules (Vorschriften für Amateurfunk) are: - You can only use digital modulations if they are open (LoRa is not) - You're not allowed to encrypt your data - You have to broadcast your call sign every 10 minutes (maybe put it in a LoraWAN header?) - Autonomous stations (e.g. sensor nodes) are only allowed for clubs with written permit, not individuals Don't get me wrong, I would very much like this project to succeed, but we should know if what we're doing is fine by the law or if we have to hide ;)

@FossaSystems 4 года назад

This project is fully legal and has IARU and ITU permission, what you mention regarding the digital mode is partially true due to the proprietary nature of LoRa, but it can be decoded by anyone with a simple chip or soon and SDR (The IARU have permitted its use). We don't encrypt data. To transmit a message you must indeed be an amateur.

@freelancer917 4 года назад

@@FossaSystems Hi, congratulations on your project! I'm not questioning if it's legal for _you_ as the operator of the satellite. But I'm a licensed radio amateur in Switzerland and the rules I mentioned above apply to _me_ as a radio amateur and it means that sadly I'm technically not allowed to operate an autonomous sensor node without standing next to it, if I'm even allowed to use LoRa on the amateur bands at all.

@FossaSystems 4 года назад

@@freelancer917 I think the fact you are using LoRa is not an issue. You will, however, need to "monitor" your station as a HAM amateur.

@yessicadyslen9353 4 года назад

Good day, could someone teach me how to build my own ground station? Is that the video does not explain the connection of elements well and how to implement the code?

@AndreasSpiess 4 года назад

Maybe you join their telegram channel. There you should get help

@barryjreid 4 года назад

Anyone have the link to the sat data channel on telegram? I can only find the community channel.

@AndreasSpiess 4 года назад

Maybe you ask on the community channel?

@yrath5034 4 года назад

Ch: FOSSASAT-1 DATA Real time FossaSat Messages t.me/FOSSASAT_DATA

@devalnor 4 года назад

Do you know what is the expected life time of LOSSA SAT1?

@AndreasSpiess 4 года назад

No. You have to ask Julian

@linagee 4 года назад

Slightly different TTGO (no screen, but still 433Mhz LoRa w/ ESP32), also the only way to get it quick with Amazon: amzn.to/2YsjcKF Maybe even this one would work: (Technically $20.99) amzn.to/2LOdtKf

@AndreasSpiess 4 года назад

The first is better...

@mschorer 4 года назад

Interesting, that you use the Arduino IDE instead of the Visual Studio Code which you once showed on this channel. What is the reason?

@AndreasSpiess 4 года назад

Most of my viewers use Arduino IDE. The ones with platforms know how to port it to their platform. The other way not.

@dd0356 4 года назад

vs code is very confusing and requires a lot of time for people like me. arduino is the "default" which is used by everyone.

@mschorer 4 года назад

jk44 v2 agreed! And I thought I am the only one who has trouble with VCS 😂

@johncrunk8038 4 года назад

I use VSC whenever I can. Most of the problems arise when sketches don't follow the C/C++ rules; like putting functions in the sketch after they are called. If you put the "#include at the top of most sketches, the VSC/PlatformIO usually works fine. I usually have to create a header file with prototypes for functions if they are not properly coded. Generally I am very happy that the Arduino team got the ball rolling, but they put a lot of crutches in the system that makes a transition to a "real" programming environment difficult for beginners.

@ArieLash01 4 года назад

I am not a rf guru but I think the antenna needs to be horizontal not vertical the radiation patterns needs to go up z not out xy

@AndreasSpiess 4 года назад

The satellite moves and we do not know which polarization it has in each moment. And the satellite usually passes at max 45 degrees, not overhead a ground station.

@ArieLash01 4 года назад

@@AndreasSpiess I was talking about antenna gain a whip antenna is for example a yagi not the way the device in space. Thank you by following you I got to this great feat of a young man. The issue is the device seems to have not extended it's antenna.

@priteshmaharana5416 4 года назад

I have watched your video, I am from India, I have also seen telegram fossasat chanel and did not able to know wheather fossasat 1 is ok or not pls make a video of succesful data transfer with fossasat 1 , and what is your ground station name.

@AndreasSpiess 4 года назад

Fossasat never worked ok and is dead now. They plan new satelites this autumn

@cedricpod 4 года назад

hmmmm what about MIMO or phased array ?

@AndreasSpiess 4 года назад

If this system is viable, it has to work with simple antennas.

@josedavid6400 4 года назад

can't get fossa from gpredict even after update TLE data from network several times. Do you know an alternative way to track them? Thanks for another good video mate!

@AndreasSpiess 4 года назад

As I said in the video, you still have to upload it from a file. You find a link it in the description.

@josedavid6400 4 года назад

Andreas Spiess Thanks! I missed this comment. Already working, hope this night catch up with SDR. Thanks!!!

@soumitradey8208 4 года назад

Is heltec lora 32 inbuilt antenna suitable? Or need external

@AndreasSpiess 4 года назад

We have to see when the satellite is fully operational.

@soumitradey8208 4 года назад

@@AndreasSpiess thanks Sir, i tried today from my ground station at new delhi, when fly by was scheduled, i used the heltec eso32 lora, no packet received but i got system information of satellite data like solar panel voltage, temperature

@cedricpod 4 года назад

how about adding a parabolic dish ?’

@AndreasSpiess 4 года назад

For each sensor? This system has to work with simple antennas

@cedricpod 4 года назад

www.freeantennas.com/projects/template/

@cedricpod 4 года назад

all-of these videos are very useful ..... i absolutely love them

@DC9FO 4 года назад

@@cedricpod a parabolic antenna for 4xx MHz would be too big. The example shown on that site is for 2,4 GHz. For 4xx MHz you can use a Yagi with reasonable gain. The problem is, you have to follow that satellite as it is not standig on one single point at the sky. That makes it a bigger project as you need to move the antenna in elevation and azimuth. An "eggbeater antenna" could help. on6wg.pagesperso-orange.fr/Doc/Antenne%20Eggbeater-Engl-Part1-Full.pdf

@jospicant 4 года назад

I can not find fossa Sat in gpredict ( I have update but don't apear ). Congratulations! It is an amazing video

@AndreasSpiess 4 года назад

Currently you still have to load a file. You find the link in the description

@kermets 4 года назад

where do you load that txt file ?

@linagee 4 года назад

Try 44825. (I got "44825" from their tweet here: twitter.com/FossaSys/status/1203012305698672640 )

@lucabertagnolio9166 4 года назад

linagee I believe the correct catalog number for FossaSat-1 to be 44831 aka 2019-084H

@kermets 4 года назад

Makes sense because I cant see any 44825 that has launched 6-12-2019 but 44831 is there, Object H www.n2yo.com/database/?m=12&d=6&y=2019#results

@alanpaschoal7299 8 месяцев назад

Guys, can we send msgs and receive using these sats?

@AndreasSpiess 8 месяцев назад

So far, these sats have no repeaters

@jesuschal3802 4 года назад

Very frustrated over the fact that I can give one like only.

@AndreasSpiess 4 года назад

:-) In addition, you can subscribe ;-)

@Un_Pour_Tous 4 года назад

A baby Satellite how cute

@AndreasSpiess 4 года назад

I am not sure it will grow, though ;-)

@zo1dberg 4 года назад

Dear Europeans, the dollar sign goes BEFORE the number. E.g.: $20 Cheers, -An Australian.

@AndreasSpiess 4 года назад

I hope the Australians can live with my compromise ;-)

@zo1dberg 4 года назад

@@AndreasSpiess hahaha! ok :)

@erfinderwerkstatt 4 года назад

Let's use it in-between the number, as compromise. 2$0!

@TheBodgybrothers 4 года назад

Compromise and do it the wrong way... as is the life of a married man.

@erfinderwerkstatt 4 года назад

@@TheBodgybrothers This is the way.

@YvesGageot 4 года назад

What is the maximum distance between on sensor like TTGO and nearest ground station ?

@AndreasSpiess 4 года назад

The important distances are to the satellite. There is no direct communication between the sensor and the ground station

@YvesGageot 4 года назад

@@AndreasSpiess I understand but my question is a little bit different : The satellite act as en repeater. When a sensor emit data, it must "see" the satellite; And a ground station must simultaneously "see" the same satellite. If the sensor move like a car or a boat, it must send data only if it is sure of a ground station reception. What can be he maximum horizontal distance to manage the data ? In your local personnal test, sensor and ground station were in the same place, in this particular case what was the horizontal distance to "see" the satellite ?

@YvesGageot 4 года назад

@@AndreasSpiess Whis an altitude of 400km and earth 6371km a simple Euclid calculus: I found 2293km to see the satellite from sea level. I also used the node module tle.js to do more calculus with the satellite TLE, As you did, I determined from my home, for one week all the "windows" and the minimum ranges. With your TTGO ground station and basic antenna, if you receive some data, I am interested to know what was the direct range. It will permit me to reestimate the reception windows in the future.

@AndreasSpiess 4 года назад

Unfortunately, we have to postpone these experiments till the satellite works or till the next is up...