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The vibrational spectrum of the Enlightenment, or espionage

The noises

The language (NF))
The tent of the President
the telephone booth

The high-frequency signals
 
- General -

The high-frequency signals
slow signals

The high-frequency signals

optical signals  

The high-frequency signals

- communication

- Radio communication networks
- Directional radio
- Satellites
- Direct coupling

The heat signals

Thermal radiation/air-gap

The high-frequency signals of the light
Fiber

The X-ray radiation and higher ...

Author: Old Gocs
   - All rights reserved -
Berlin, August / September 2013

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The frequency spectrum for the elucidation

Frequency range medium sensors Result Application Info
 < 10 Hz  Vibration sources in the soil, air, water or other media geophones (Earth)
geophones (Earth)

Hydrophones (water)
 Motion for human and technology geophones;
First known use in Vietnam (Ho Chi Minh Trail)
  Hydrophones, already in the first About World War the successful use of geophones are details. How troop movements on the "Ho Chi Mink" path could be identified and evaluated.
Hydrophones can hope for a successful past and future. Also found in modern nuclear submarines use