https://youtu.be/xAUJYP8tnRE
This is the video. It's very interesting and raises some interesting points but the one about radio signals has left me confused.
If our radio signals have degraded so much over 100 light years that they can no longer be told apart from back ground noise, why are we listening for radio signals from other galaxies? Surely the further away they are past the 100 light year radio frequency 'boundary' (I'm not sure if that's a real thing, hopefully it makes sense. I mean past the point that radio signals degrade to the point that they are indistinguishable from inter stellar radiation/noise etc) or are scientists looking for something else? All those radio telescopes are why I've made the assumption I have.
Can anyone correct me please?
Every now and then I see a video or article about why we haven't encountered alien life, and if the fact that we haven't means that we're alone in the universe. I often think that it's really easy to overlook how big space is. Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space. (Sorry, had to!)
But the point I make to folks when we're ruminating on other beings in the galaxy is that the vast majority of the galaxy would have no way to know that we exist at all. The only signals we've sent out into the universe that could potentially be detectable are our radio signals, and those decay over distance and time. Even if we assume that an alien civilization could detect the tiniest signal, we haven't be broadcasting for very long at all, so our signals haven't had time to get very far.
Anyway, the whole point of this rambling is to lead up to this great picture I found years ago that I think illustrates the vast distances involved better than any text. The blue dot in the photo is approximately 200 light years across. The first radio signal ever sent was in 1895, 126 years ago. Every signal mankind has ever produced is still well within that tiny blue dot. Everything outside that blue dot would have no way of detecting our presence at all. Just kinda puts things in perspective, eh?
https://preview.redd.it/kt22te3tx7281.jpg?width=2048&format=pjpg&auto=webp&s=e3d454fa17c186f0c34a5efecdcefc419603fd9b
I was wondering if it's possible to create a command. In this case " hey google close all blinds" to send a radio signal through the right frequency so the motor of my blinds closes them
Psyops propagandists will try to attack strawman arguments in order to terminate thought ("911 conspiracy theorists are dumb, jet fuel cant melt steel beams but they can soften them enough to cause a collapse"), so to counter them, always present the best arguments that are easy to understand and impossible to debunk. A proper response would be: the topic is tower 7, and it's official reason for collapse is small office fires PER NIST. NIST says debris from wtc towers only did superficial damage. If you have other explanations, you're a crazy conspiracy theorist.
In the official Apollo spacecraft DVDs an Apollo astronaut is able to respond to Houston faster than it takes for a radio signal to travel to the Earth and back to the moon. This is DEFINITIVE evidence that the moon landings weren't what they were presented as.
Timestamped link here: https://youtu.be/KpuKu3F0BvY?t=5750
The director of that doc is also the same person who created "A New Pearl Harbour" btw, the gold standard of 9/11 documentaries.
So I was messing with my pedal chain and now I'm getting a faint radio signal through my speakers. Any solutions?
Dear community, some fragments of this movie sometimes hunt my mind. It’s around 20 years old. There’s a village that is controlled by the above mentioned method (i don’t know which one, can be that I mix things up with Kings „Cell“). I remember that the main actors are teens (around 14-18yo) and that they move on bicycles quite often. It could be that there’s a mountain in the small village. They also get behind the drug abuse and try to fight it. Can you help?
Thanks to u/surfintheinternetz the direct link:
http://kirkmcd.princeton.edu/JEMcDonald/mcdonald_aa_9_7_66_71.pdf
Download the JPEGs via Twitter link:
https://twitter.com/Spacecowboy781/status/1435636404097257472?t=AscJ7AjmPV1pxk4CvticSA&s=19
I apologize in advance for the basic yet not so basic question. I've searched for answers and mostly found other confused member so maybe someone with knowledge can clear this up.
Im wondering about the logistics of beacon witnessing.
When a Hotspot send out a beacon, and other hotspots witnessed it - what happened here exactly, did the beacon reach the witnessing hotspot's antenna, physically speaking, or did the witnessing Hotspot's Radio signal meet the beacon somewhere?
if a beacon has to reach an antenna for it to be witnessed (and not only reach an antenna's surroundings) wouldn't moving an antenna as few inches left and right potentially have an impact (positive or negative) on the amount of beacons witnessed?
again, i know this sounds super dumb, therefore, eli5
Hi. This is a reception test of a weak CW beacon signal at 28 MHz band. The beacon has 1mW and it is placed ca. 5m from the transceiver antenna.
IC-7300 video test : https://youtu.be/MhlKGTm6OY8
For comparison here is a link to results of other radios : https://youtube.com/playlist?list=PLKf3o2uM5x7JuWPj8DaMIxEZmPbzO4mWv
Hope you enjoy it,vy 37 Alex F4VTS
What does the radio do? I'm kinda new to the game
Hi, I’m planning a personal project drone and I want to build it from scratch. I’m still in stage 1: “figuring out if every component is possible”.
Wondering if anyone here knows how radio data is transmitted. I want to transmit from an off the shelf controller (or a custom controller) to a custom embedded computer on the drone. On the receiver side, how would I decode the packets from the off the shelf controller??
Do they have data sheets with a protocol explained? Do they all use the same standard format? Does radio have a standard? Is it encoded? How is error checking done? Does it use CRC? How do I differentiate between noise and control signals? Can I determine signal strength or SNR easily? Do I need a separate module for signal strength detection (I think RSSI is relavent here)?
Edit: https://reefwing.medium.com/how-to-write-your-own-flight-controller-software-part-2-bc7f27214bb2
This guy does everything here^ even has rssi
Arecibo is a project in development.
This is a Radio Signal Observation Network, you can add your observations, send your audio samples, which can then be analyzed (spectrogram, FFT), add comments.
Here are some screenshots :
https://preview.redd.it/4m4qfivbwoa81.png?width=1365&format=png&auto=webp&s=d5136610db05e701fb8a9c2e623dd688cff051d0
https://preview.redd.it/h1agylwewoa81.png?width=1365&format=png&auto=webp&s=f414325406db3e628887e2899ac9ea91b7c92e36
https://preview.redd.it/a7qehwpdwoa81.png?width=1363&format=png&auto=webp&s=af4161ceeedbdef208d229bc7d2982a73f168fe4
Here is the temporary address of the site Arecibo.
Discord : https://discord.gg/VguEzURaKZ
I would like to have users to see if it runs properly, to have suggestions for improvement and especially the bugs encountered.
I know Earthland is primarily a Magic world, rich in Ethernano and all that, but we have seen some technology in there, and they've advanced it by the end of the series. We have movies, as we've seen when the children escaped the Tower of Heaven and (I don't remember exactly who it was) they found an old movie on one of the ships. They also have broadcasts that they used for the Grand Magic Games, so, combined with the movies, I would assume that there's also television and news broadcasts too. They have newspapers so they have to print those somehow. Obviously every building has lights and heat. They have vehicles, though I know those are Magic-powered. And they have mobile phones that Warren invented, which, I know he said they're just portable communication lacrima's, but Mashima never went into detail on how exactly they're powered. Like how do they charge the phones, do they just imbue it with their own Magic Power? What about the people who can't use Magic, do they not get phones? Cause we know that the majority of Earthland's population cannot use Magic. Not to mention Alvarez has friggin' Cyborgs so...
So that's why I'm just curious what do you guys think that the level of technology on Earthland is? Do you think they maybe have computers and internet? I mean, there's Archive which is a Magic Power that kinda acts like a computer, but it does tap into data on various things, so that data I would imagine has to be stored somewhere on like a "server" that Archive taps into, right?
And is it all just Magic-Powered, or do they actually use electricity and other things? Do they have like Power Plants, but instead of producing electricity they produce Magic Power or something?
Again, I know that this series is meant to be a "Fantasy world", like, the kind of world you'd find in an MMORPG and all that, but they have shown technology here and there, so I'm just wondering how far did they take it.
As I understand it, WiFi works through radio waves. From what I remember of EM physics, radio waves are lower energy than visible light since they have longer wavelengths. So how can they pass through opaque objects like walls?
Hey guys, I am just getting into FPV drones and I bought myself a GepRC Cinelog30 with the FRSKY R-XSR receiver such as a used Teranis QX7 ACCST LBT. After a lot of problems binding the radio to the receiver I flashed the firmware on the drone and the receiver (I hope I did it right. I just followed a couple of YouTube videos).
It seems like they are both connected now (the receiver turns from a blinking red light into a solid green when I turn the radio on and the radio says that a model is still connected when I try to turn it off).
However when I try to use the radio, the drone doesn’t react. I tried checking in the receiver tab in betaflight and it also doesn’t detect signals when I move a stick or switch.
I flashed my receiver with RXSR_LBT_ACCST_191112.fr My radios firmware is OpenTX-x7 2.3.14 My Betaflight firmware is BTFL 4.2.3
