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Subradio

(electromagnetic radiation, frequency below 3kHz)

The term Subradio is sometimes used for Electromagnetic Radiation with Frequencies below that of Radio. In communications, such frequencies are used for only very specialized applications, and the "lower end of radio frequencies" is not universally agreed upon, and has been placed at different frequencies, e.g., 3Hz, 3kHz, or 30kHz.

Bands at the lower end of radio or beyond, i.e., subradio:

Very Low Frequency 3kHz-30kHz
Ultra Low Frequency 300Hz-3kHz
Super Low Frequency 30Hz-300Hz
Extremely Low Frequency 3Hz-30Hz
Tremendously Low Frequency 0Hz-3Hz

(EMR,spectrum,band)
http://en.wikipedia.org/wiki/Electromagnetic_spectrum
http://en.wikipedia.org/wiki/Extremely_low_frequency
WaveLFreqPhoton
Energy
  
100km3kHz12peVbeginSubradio
inf0Hz0eVendSubradio

Referenced by:
Electromagnetic Spectrum
Extremely Low Frequency (ELF)
Radio
Super Low Frequency (SLF)
Tremendously Low Frequency (TLF)
Ultra Low Frequency (ULF)
Very Low Frequency (VLF)

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