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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
Hi, did anyone see this?
It occurs to me that copper might not be as useless as we thought, a relatively minor change ie including boosters at regular intervals along the cable(s) like Nodes of Ranvier could allow terabytes of data to be sent along a single twisted pair using an atomic clock built into the router itself.
As atomic clocks are getting near chip scale now it would be relatively easy to add one to a router with its own backup battery so that data could be sent in this way. Simply encoding the signals as spiral EM waves in the copper and calibrating them so that losses *exactly* match gain would minimize crosstalk and allow far more bandwidth than anything currently used by exploiting the skin effect.
An additional modification I suggest is to detect weaknesses in the system and mesh up the network so an imminent failure (ie corroding wires) can be routed around with only slightly increased latency.
Sending data hashed with a Onetime Pad received over satellite TV at 10.8 to 10.9 GHz (existing system) would be a very effective security method and without that critical time shifted key the data would be totally garbled and unusable to a potential attacker. Only one minute would be needed and if it was sent at say 3am or at the end of an existing program several GB of OTP could thus be sent in one go.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
I read a critique of this technique (or something very similar) some time ago, A simpler method is two circularly polarised signals of opposite twist (left/right) so no practical gain foreseen.
As em waves propagate through our atmosphere the polarisation varies e.g. a vertically polarised signal can be received on a horizontally polarised antenna so very short line-of-sight paths would be required to maintain signal integrity.
With copper the phase delays would need to remain constant so some sort of waveguide/shielding would be required I guess.
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
Probably why satellite TV only uses two distinct polarizations even though eight would work just fine with lower S-N ratio. Also to maintain compatibility with existing equipment made in 1990 with first generation HEMTs and left outside in the rain and thunderstorms for decades.
EDIT: Satellite SETI might be doable, use Freesat boxes with added RPi and when not in use the Pi sweeps unused frequencies for strange signals then records the raw data to memory for later analysis. If lots of units all sense the same signal then something interesting is going on.
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Twisted radio waves
