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Question about radar limitations!

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Hi!I have a question that I need to have an answer for.If a target does not show up on the radar screen despite the fact that it is within the radar beam, the reason could be:A: The target is smaller than ten times the wave lenght.B: The attenuation of the radar pulse in the atmospher, especially if it is raining.C: The target is approaching the radar station head on.D: The target is using a VHF radio transmitter which disorts the radar pulse.Would appriciate answers that explains why the one selected is correct.Best regards and truly thankful!Per Tufvesson

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