Thread: A free cost ELF comunication

ELF waves have giant waveleangth and almost not absorbed by environment.
For example what would be penetrating ability of ELF magnetic component at
1 Hz? ELF radiation of relatively small electric devices is not completely negligable.
For example ELF radiation magnetic field of motor in your washing machine is
mesured in nanoteslas and it could be done with handheld metter purchased
anywhere.What if we will make a transmitter which consists of billions tiny nanoantennas
which of them transmitts at 1 Hz with nanosecond delay from each other? Would we be
able to communicate freely accross the globe? Even thought power of such ELF waves
would be extremely small if they are absolutely anabsorbed by environment they still
could be detected with some hypesensetive magnetic antennas?

ELF waves are not completely unaffected by the environment. Nano transmitters would be worse than useless as you need an extremely large antenna to effectively transmit ELF because of the large wavelength. There are a handful of ELF transmitting stations already, mainly for communicating with submarines (which normal radio frequencies can't reach), and they use the whole Earth as their antenna. The big drawback is low transmission rate. You can't modulate a radio wave at a greater frequency than that of the radio wave, so ELF communication is limited to a few characters per minute.

You can't modulate a radio wave at a greater frequency than that of the radio wave, so ELF communication is limited to a few characters per minute.

This is if you have only one antenna.But what if you have billion of antennas whis transmit simultaneously?Then you could very delay rated between those antennas and/or frequency at which they transmit.

ELF waves are not completely unaffected by the environment. Nano transmitters would be worse than useless as you need an extremely large antenna to effectively transmit ELF because of the large wavelength.

What do you mean as effective transmission?As I assume EM wave is trasmitted once it is generated.Wavelength of 1 Hz frequency will be mach larger then Earth globe.Could you provide some exact calculations how much it will be absorbed by environment?Yes,if you want to convert as much as possible energy into radiation then physicsl length of antenna should be as much close to wavelength of EM wave.But even if it is much smaller then its power will never be equal to zero.Even if it will be extremely small you still could capture signal if you have extremely sensetive receiver.And if some wave is practically anabsorbed by environment you still could capture this extremely weak signal.
But this idea requires some detailed calculations.Could you make some?