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Send many radio

hi everybody today i'm going to show you something i've been working on for quite some time i saw this satellite dish finder or a pan and tilt and they i really wanted to look at satellite communication and then i stumbled upon a lot of links where you could see what type of data came from the satellites and that led me to a satellite network called iridium i don't know if you've heard about it but it's like 66 satellites floating around in space that you can use for data communication all around the world and then i found out that the international space station also uses radio frequencies and send images occasionally to um to ground to to earth and if you have a radio you can pick them up um and then i found out that if you have a phone or on your pc also you can you can find programs so you can find a iss and you can see you've got two minutes when it's passing by at 4 23 thursday to get that image out of the air and the image is transmitted in a protocol or a method called sstv i think it stands for slow scan tv and the idea is that you you take a picture for example this picture you can see here on my screen with the copper tube here and then you format that picture into sound and then you transmit that sound using a radio so um i went online and i found on aliexpress or ebay a very cheap model called bail thing and it cost you can see twenty dollars and i actually have it i have it here the radio and um and the only thing you do you have to do is you have to convert that picture into sound and then put the sound into the radio for example if you if you have here you can see there are two holes one is from one is for mic the one at the top is a speaker and the one at the bottom is the mic microphone and then you need to have a cable like this a jack cable but because we're going into the the one at the top um no it's a microphone microphone cable that's right uh so you only need to have i have one here with this type of jack in both ends and then you plug it into your raspberry pi if you have such a one on your pc and and then you plug the other end into the radio and you activate something called voice activation uh transmission vox so and the way you do that in these radios here is very simple you just press the menu and four and then you can see it says vox and then you select a volume level that it will trigger on and when sound comes in here it will press the transmit button automatically so to convert the picture into sound you need some software and here i don't if you can see it on on my screen i have um the raspberry pi and the only thing you have to do with commands and install of software is get hold of python pip so you can install pip modules and then music one two three to play a wave um file into the or out into the speaker that you attached to the to the raspberry pi you can see i i put it in here and and now i put it into a speaker instead of the radio just to simulate that we are sending it out into space or into air and when you use the uh the two meter band which i i honed in on well no i didn't but you can use the 144 megahertz then you have a range of approximately 100 to 150 kilometers so you transmit that and then you receive it in the other end also with a radio of some sort and then you put that signal into your computer to simulate that i have a headset here where we will take the microphone and put here just like if we had a radio receiver an extra one so to convert the picture very simple just install the the music one c3 and then pip so you can do the pip install pi ss tv when you've done that um you connect the radio and then you only run the python minus m for module pi sstv forget all this and then you just add an image and then a sound wave file that you will get out of that command when you're done with that one you play here this a mixer here i have i don't know if you can see it it's just to set the volume to 100 but then you play it with music 123 and then the wav file it's that simple really it is and i will show you how it looks here let me see if i can find the start command here we are so start and then image that's a script i made that just runs the python command it will start converting the image and then it will send it to the radio and in this case it'll be the speaker it will be received in the other end with a microphone here and then i have started up a program here on my computer called mms stv and then we'll see this image down here that we are converting and transmitting if we can receive it again and i will go to this rx tab here and let's see how far this one got oh it's not finished converting yet but it will be in some few seconds and there are some settings in this mm ss tv that you can poke around with but you can see here it says rx mode auto and you have different ways of transmitting the image i actually created a website over here so we can upload it to the raspberry pi and select different modes here see it's not that important oh it's done and we can hear now see the sound is coming out it is being transmitted automatically and let's see here in the rx if we start receiving anything no i think i forgot one thing setup and then select the microphone well it's selected i'm not getting any information in no let me just try that one more time hang on okay so i'm back so uh some program i had running down there took the microphone and headset and and kept it for itself so this program couldn't hook on to it but right now it's uh it should be ready again so we go to the receiver part you can see there are some data here it's converting the image as you can see here and we're waiting for the conversion to finish so it'll be transmitted via the loudspeaker again there we are and let's see if it works now yeah it does it's it's hard to see here but it'll it starts with a lot of white lines here it's it's drawing every line for itself you see and that way you can send data or a picture many hundred kilometers just using radio waves this beofang radio called uv5r is transmitting with i think it's eight watt eight watts so um that that is enough to get these at least 50 to 100 kilometers [Music] and as you can see the picture looks like the one down here if you're sending data you can it can be hard to get validated because there are so much noise when you're talking about radio waves and transmission so you need to have a lot of error correction also but i hope you can use this it's a very cool project and you can start sending out sstv with a very limited budget so have fun and give me some comments below if you have anything to add here thanks