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Frage 579

What is receiving directivity factor (RDF)?

  1. Forward gain compared to the gain in the reverse direction
  2. Relative directivity compared to isotropic
  3. Relative directivity compared to a dipole
  4. Peak antenna gain compared to average gain over the hemisphere around and above the antennaRichtige Antwort

Erklärung

Receiving directivity factor compares an antenna's peak gain with its average gain over the entire hemisphere around and above it. Since noise arrives from all of those directions, RDF predicts the signal-to-noise improvement a receiving antenna gives better than forward gain or front-to-back ratio do.

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Frage 579: What is receiving directivity factor (RDF)? · FCC Amateur Extra Class (Element 4) · Questena