Thanks J_P, for good explanation.
One remark: I intentionally did not gave high output power transmitter solutions to stay inside authorities regulations limits regarding EMI disturbances in RF spectrum.
At the same time, using low power TX, we can, with proper designed RX, and under proper circumstances, even sense changes in wave polarisation on short distances, which is very important to distinguish between different source and direction of received wave mess. With even slight higher power this is not possible to achieve at short distances.
RX problems and solutions we will discuss once in next year.
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