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Technically quite possible, Practically not at all. It would fail for the same reason that such systems failed to gain popularity in to open public for us. Verifying delivery: Intrinsicaly, the pneumatic tube system is one-way. You load the tube, launch it, and ..... That's it. It does not include any means of verifying that the delivery succeeded. It does ...


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So, would an alternate past where the Romans had actually put all these things together to produce a pneumatic tube postal service for the city of Rome be plausible? Technically : Maybe Practically : No As others pointed out, it would definitely have been technically possible if they wanted to build such a thing. There have been many amazing machines and ...


1

Show, Don't Tell There have been plenty of discussion on this site about the difficulties in leaving warning signs or instructions for future generations. Even assuming that the person who sees your warning or message is the same species as you, when you are talking about thousands of years in the future you just can't account for cultural shifts that could ...


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I know you've already linked "How could an ancient race warn the future in a universally understandable way?" - I'd encourage you to read through the "Expert judgment on markers to deter inadvertent human intrusion into the Waste Isolation Pilot Plant" report. It makes some very interesting points about super-long-duration structures and ...


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Don't underestimate the difference in knowledge required to understand how to work a device, from that required to understand how a device works. Humans - even extremely non-technical ones - interact with a range of complex devices every day without scratching the surface of how they work. Computers and smartphones are the canonical examples, but when's ...


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Assuming the aliens planned to leave the device behind to be discovered they have any number of options. The key point/question though is how far in advance did they make those plans?. Note - in all cases the stone artifacts etc were probably left simply to attract inquisitive aliens to the burial site and do not serve any other purpose. 1) Did they build ...


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Avatar in Hindu belief, a manifestation of a deity or released soul in bodily form on earth; an incarnate divine teacher Your machine would pay attention to the beings that entered the control chamber. It would quietly learn how they looked, moved, smelled and sounded. Then it would produce a being in the likeness of those it encountered. It would be ...


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I an making the assumption that the aliens will communicate via visual and audio media. For example, alphabets, pictures, videos, sound. If they communicate via farts and dance then the same principles hold although it might take humans a little longer to understand instructions. On that assumption the solution is probably 'via baby-steps'. Imagine you ...


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Assuming that they have eyes, a pictorial instruction manual might work. Start with pictures of the machine itself so there is a common reference point. And zoom into various rooms so it is clear where they are, then zoom into screens and provide pictures of button sequences with pictures of the out come. Pictorial background information could also be ...


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Consider which timeline owns the message as it transits When does the "message I'm sending to the past" become a "message I received from the future"? Until someone actually does this we'll never know, but my hypothesis until someone proves otherwise: when you link two things across time such that they can communicate, the behavior of the ...


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Strictly speaking, entanglement cannot be used for communication let’s say that Alice is in Alpha Centurai while Bob is in Copenhagen. We produce these particles and send one to Alice and one to Bob. Now, when Alice measures the spin on her particle, she finds it to be up. This means that Bob must measure spin down for the total spin to be zero. When Alice ...


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The starting event of this is a geomagnetic flip of the poles. The time for the flip to occur is measured in hundreds of years. Typical scenario is that the poles split into smaller weaker poles that wander around for a few centuries then reconsolidated. The wanderings start decades before -- time to build the domes. population is determined by how much ...


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Somebody stole the ionosphere! For a few scattered domes to contact each other by radio, they need one of two things: satellite repeaters, or the ionosphere. I will assume the satellites have fallen victim to time, often being deployed low in the sky, or being cryptographically locked up with codes that are long since lost somewhere in the Contaminated Zone....


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There are no technical reasons that would prevent communication, so you will have to create political ones. A useful subplot might include the consequences of illegal communications between cities. There was a book series "Silos" by Hugh Howey that included a similar theme. His cites were underground which restricted the communication possibilities ...


1

The vast quantity of radio receivers and transmitters on the planet would be decimated by the electromagnetic pulses caused by the detenation of multiple nuclear devices in the atmosphere. Similiarly so would computing devices,networks and all their support structure would be destroyed as well. The land based power sources would be damaged by EMP effects ...


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Communications worked... for a while First of all, the main communication method would be internet, not radios. After all, to this day everyone is connected to the internet via different methods (incluind radio waves) but most/all of them at some point require a large wire bewteen two points, or a huge antenna communicating with a satellite. Now, humans had ...


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It's setting you up to be a target. There are still weapons that will home in on any active radio transmitter. While some hypothesize that there are safety precautions to prevent their attacking their own, no one knows what it is, and besides, it's known that several powers used them so you would need many such unknown precautions. Safer to not use them. ...


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Electrolytic capacitors present in many circuit boards have a short life span (~15-30 years). Once they are gone, the circuit no longer works. If you lost your industrial capacity, you will not able to build replacement parts and all your electronic devices will become useless. Electrolytic capacitors is the only practical alternative for high capacitance ...


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Because every city they thinks it is the last city left The cities are far apart and, as the OP said, nobody from outside is allowed in. So, in every city the people have no clue that other cities could still exist. In such situation it is safe to assume that people have much more compelling things to do, rather than "wasting" rare and precious ...


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I have a few ideas. Any radio antenna outside the dome would eventually fall into disrepair with nobody going out to fix them and fail. Antennas inside the domes would be attenuated by the dome, which would presumably be built with metal parts to create a Faraday cage as well as just plenty of mass to diminish RF power. Increasing the power to break ...


55

If you want a more haunting reason, perhaps during the final days countless people all over the world set off repeat distress signals, and ever more computers did the same, those computer cycling through frequencies in an attempt to get an emergency response that will never come — and still are to this day. Being the near future, their power is renewable or ...


7

Faraday Cages Whatever material the domes are made of is opaque at radio wavelengths (even if they are transparent to visible light). Basically no other form of EM radiation has a range much beyond the horizon. On top of that landlines require maintenance, submarine cables even more so. The only form of long distance communication possible shall be global ...


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The virus is not biological The virus is actually many tiny machines (nanites) that are constantly communicating with one another causing a great deal of static across all useful RF bands. This would also help explain how animals can be infected and how the virus had near 100% lethality to people outside the domes when the apocalypse happened. Additionally ...


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Failure of repeaters Satellites and land based repeaters will fail. Some signals will be able to be passively reflected off satellites, but this is sub par compared to using active repeater. This will of course depend on where the satellites are. Long wave has costs While lower frequencies/ long wave as 'ground waves' that follow earth curvature will get ...


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Look to social reasons. Each dome is isolated, but before isolation the populations will have heard news from primarily, their government. And we know from 2020-21 what governments do in the face of a global infection - they blame each other and claim it's deliberate, or a covert plot of some kind, and shut the borders. (If they don't, its not implausible ...


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If there's no feasible natural reason, look toward deliberate engineered reasons. In the time when the domes were being established, existing city states were failing and there would be essentially a big free-for-all war. Someone decided that jamming communications would be a good idea for them, and that system is still going on, or they did something like ...


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