30-03-2016, 15:17
Hi everyone.
The technology antenna and wireless transmission of signals is very complex and complicated problem. E.g. - Theoretically it does not matter which antenna at which end of the transmission chain use, but in practice it is not at all true. When we don't give to the transmitting side powerful enough antenna, terminates the signal at the receiving end in noise. Using too powerful antennas can exceed the legal limits and extra "get" lots of reflections from the surroundings. At too powerful antennas on the receiving side we can receive even much more interference.
Neither antenna polarization is not a simple problem. When using 1/4 wave antenna theroretically we should always use vertical polarization, at least a little to emulate half-wave dipole antenna degraded second half. Theroretically, it is also the largest reach in a horizontal field. However, when the transmitting antenna is on the roof, are below the theoretically completely no signal.
And the influence of the surrounding area is also essential - eg. in my measurement, I have to respect exactly where I stand and where measuring apparatus is lying that the results of measurements at least approximately correct.
Therefore, always leave a part of some kind of experimentation and testing, as in the present case and the situation best. But perhaps that is why this part of the building weather stations so funny ???
The technology antenna and wireless transmission of signals is very complex and complicated problem. E.g. - Theoretically it does not matter which antenna at which end of the transmission chain use, but in practice it is not at all true. When we don't give to the transmitting side powerful enough antenna, terminates the signal at the receiving end in noise. Using too powerful antennas can exceed the legal limits and extra "get" lots of reflections from the surroundings. At too powerful antennas on the receiving side we can receive even much more interference.
Neither antenna polarization is not a simple problem. When using 1/4 wave antenna theroretically we should always use vertical polarization, at least a little to emulate half-wave dipole antenna degraded second half. Theroretically, it is also the largest reach in a horizontal field. However, when the transmitting antenna is on the roof, are below the theoretically completely no signal.
And the influence of the surrounding area is also essential - eg. in my measurement, I have to respect exactly where I stand and where measuring apparatus is lying that the results of measurements at least approximately correct.
Therefore, always leave a part of some kind of experimentation and testing, as in the present case and the situation best. But perhaps that is why this part of the building weather stations so funny ???