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 |
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.