One thing of note is that 1000-base-T and G.991 (marketed as SHDSL/HDSL/SDSL depending on country/telco) is somewhat similar technology that is hard to classify as being baseband or broadband. One of my somewhat more absurd networking experiences was using SHDSL as “LAN with cheap wire” on anime convention. We had few hundred meters of flat phone “tinsel wire” left over from previous project and I had somehow acquired bunch of Cisco 17xxs and WIC-1SHDSL line cards. It worked well enough for our purposes and I learned one thing: plain G.991 works over random wire reasonably, while G.991bis with enabled channel bonding does not (probably because of crosstalk).
Edit: one notable thing was that we tested the whole setup beforehand with same cables, but coiled. And all the links were capable of at least 3Mbps. Once we unraveled the cables on the site most of the links were unable to train at more than 512kbps in two-pair mode, but worked reliably at 1.5Mbps in single-pair mode.
This reminds me of an old magazine article (Acorn User?) that described how to use a pair of BBC Micros with wired in LDRs and flashlights to transmit data wirelessly.
And that reminded me of a childhood project where I hooked the user port (8 bit parallel) of one BBC up to another and wrote a chat program that sent data from one machine to another by POKEing ASCII values IIRC. Not a million miles from what you could do with an IBM PC printer port.
Not much use, the cable was about a foot long.
My child's generation won't be able to do that, but I'm glad we have arduinos and ESP32s to fill the same niche.
I don't know much about entangled particles or objects; that being said, the one thing I keep hearing is that quantum decoherence cannot violate causality or allow communication faster-than-light. Not that you were saying that, but I keep hearing that people think a kind of quantum walkie-talkie or one-time-pad is possible. I honestly don't know either way, as I'm not in this field.
I don't know why this hasn't been upvoted much so far. It's literally the definition of hacking (da, Hackernews). I'm always hesitant to use "literally" where it means figuratively, but this can modem literally is hacking.
And to think that the concept is so simple and yet, so much fun, makes it yet more interesting.
What do you think is the maximum transmit distance with error correction bits? Obviously it would be affected by string tension and string material, but do you think it would work strung between two nextdoor neighbors child bedrooms?
We used to string talk back when we were kids, we built a poorman's network of those in my neighborhood and worked well until the next storm took them down. It is very rewarding to actually experience first hand how the vibration turns in to sinewaves and back into vibration. The problem with the current generation of kids is that most of their playtime is digitized, which may have some advantages but also I see quite a few disadvantages. Well, I don't want to take the conversation in different direction, this is about hacking modems over wire and is pretty cool project.
https://www.revk.uk/2017/12/its-official-adsl-works-over-wet...