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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 clearing up

Directional radio links

Directional radio links served the of all sorts of information in the past of the assignment. The information transferring there had the armed forces as sources, the public administration, public spreads the diplomacy, the economy and this one.

With technology available at the time then enormous information quantities were transferred for the time then.
Transmissions were besides there carried out also by means of other techniques, like the coaxial cables, however. As a rule, these systems work more greatly 2 GHz in frequencies.
As a rule, these systems work more greatly 2 GHz in frequencies. 30 km and more, bridge.
This is realized by the directional irradiation of the energies over corresponding aerials (parabolic mirror, horn radiator and other constructions).
The high-frequency energy gets while at the radial irradiation, as her for base stations for the mobile radio communications networks, degree breadth bundled in form of a beam of some here.
Depending on frequency and aerial form the directional diagrams can be optimized for the respective application cases.  

For reasons for the safety the so-called "side legs" play a special role at the transmitting aerial. Electromagnetic energies become at the side the direction of propagation emitted over these "side legs". These can be taken by a suitable equipment, stored and analysed.

What is zubeachten at a use of equipment at the "side clubs"?
 
The distance of this equipment is determined by the aim positions of the "third party".

But one does not need immediately to install the eavesdrop aerials in the irradiation area.

To this one builds his aerials in the direction of propagation. These can up to the 2 ... 3 fold this one judging hop length still suffices take received signals.
If her hop length amounts to 50 km, then a sufficient came under circumstances up to a distance from 100 to 150 km reception field strength offers.

She cannot supervise this broad and very long zone.

The corresponding protection be able to only sufficiently cryptic logically firm methods be used for the information. All common methods are out of the question of the till ae.