3 ms·

With a fraction of a volt and a fraction of a milliamp on it, how many fires you gonna start? No EM if it's DC. C'mon.

• haiku2077 1y ago
  Will the power company believe you that your system will only ever provide a tiny amount of power? Will you convince city government (in NYC, where some level of corruption is a fact of life) to allow your plan?
  • WarOnPrivacy 1y ago
    >Will the power company believe you that your system will only ever provide a tiny amount of power? A small guage wire (ex:24 AWG) is limited to low voltage use. The issue is that voltage will drop over distance less than a city block. ref: https://www.cctvcamerapros.com/AC-DC-voltage-drop-cable-distance-s/846.htm https://www.cctvcamerapros.com/AC-DC-voltage-drop-cable-dist...
    • myself248 1y ago
      Think of it as a telephone line. They do fine for tens of miles. And you have no signal integrity concerns, merely continuity. (Though being able to launch a TDR pulse down it would be neat, since localizing breaks would become trivial.) I wonder if a fiber would meet the definition...
• xg15 1y ago
  The wire is many miles long. You'd probably need some decent voltage to even be able to produce any kind of current in it. Even then, if the eruv was broken, the sensor would only inform you that it is broken, but not where on the entire island the fault is. (unless of course you monitor each segment of the wire separately, e.g. using capacitance sensing, with internet-connected controllers that send an alert when the capacitance of their segment changes. That would be the practical but boring solution)
  • myself248 1y ago
    Time-domain reflectometry is a thing. Copper TDRs are cheap, too.