A Test of the Mode-Averaging Diversity Combiner.

摘要

A novel diversity-combining principle, that of mode averaging, was described in an earlier technical report, TR No. 88. A test of a three-channel version of a combiner using this principle has now been made. To demonstrate the most distinctive feature of the combiner--its ability to fill in mode-interference nulls (or minima) in an hf radio channel--special frequency-modulated transmissions were used. It was found that substantial null filling occurred and that (as expected) the filling is more effective when a pair of antennas is spaced along the line to the distant station than when the same pair is spaced transversely with respect to that line. It is concluded that the first-order theory of this combining operation is correct. (Author)