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Recent content by rtechn

  1. rtechn

    Are DC filters in the HVDC systems necessary?

    The calculation of the TIF takes into consideration weighting curves which are related to the response of the human ear. I believe that if the telephone transmission is analog, interference may occur and should be avoided. This could be done either by using DC filters or shielding the telephone...
  2. rtechn

    Why Flashover for + polarity is less than - polarity?

    Imagine the rod is positive: due to their higher mobility, electrons will move towards the rod, leaving behind them a positive space charge. This will cause an increase of the electric field at the region near the plane. It is as though the rod extended and the gap diminished. If the rod is...
  3. rtechn

    far-field boundary at sidelobe direction

    Thank you for your reply. Actually, I am assessing possible electromagnetic interferences that may arise on other equipment that could be close to the radar, but obviously not at the mainlobe direction. If I assume that at a certain distance from the radar the far-field conditions apply, I could...
  4. rtechn

    far-field boundary at sidelobe direction

    Hello, I was wondering if the near-field/far-field boundary is different depending on the angle of the radiation pattern, for example, at the sidelobe direction. According to the Advisory Circular AC20-68B of the FAA, the far-field boundary for weather-radars is (gain)*(lambda)/(8*pi). If I...

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