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Radio Amateurs routinely communicate around the world with just a few milli-watts. And even a few micro-watts is sufficient to communicate across town. Many ye
by Johnythree 4y ago
Radio Amateurs routinely communicate around the world with just a few milli-watts. And even a few micro-watts is sufficient to communicate across town.
Many years ago the record was "1000 miles per milliwatt" using CW.
- userbinator 4y agoThey do that with very carefully optimised equipment.
- simfree 4y agoAnd when certain atmospheric conditions exist.
- Johnythree 4y agoExcept this discussion is about possible interference across town, or even more locally. No need for "certain atmospheric conditions". The point was that very low power signals can go a long, long way.
- simfree 4y agoYou explicitly brought up long distance communication in this thread: > And even a few micro-watts is sufficient to communicate across town. > Many years ago the record was "1000 miles per milliwatt" using CW.
- Johnythree 4y agoExcept that both can be true. A few millwats can reach across town, or across the world. The original claim was that "weak signals don't go very far", or some such.
- Johnythree 4y agoThey also do it with very simple transmitters using perhaps just one transistor. All it takes is a few mill-watts and a reasonably efficient antenna.