. The Bell System technical journal . Fig. 5—The Southard Hill transmitting site. 76 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1952. Fig. 6—Representative photographs of angle-of-arrival observations on theMurray Hill-Crawford Hill path, (a) Normal da}, (b) Two elevated paths. , 1950; 9:23 (c) Three elevated paths. Aug. 27, 1950; 1:11 (d) Multiplepaths. August 26, 1950; 11:00 (e) Wide angle fill-in. Aug. 26, 1950; 11 (f) Abnormal water reflection. Sept. 8, 1950; 11:28 During these multiple-path conditions, the recordings of the 4195-mctransmission generally sh
. The Bell System technical journal . Fig. 5—The Southard Hill transmitting site. 76 THE BELL SYSTEM TECHNICAL JOURNAL, JANUARY 1952. Fig. 6—Representative photographs of angle-of-arrival observations on theMurray Hill-Crawford Hill path, (a) Normal da}, (b) Two elevated paths. , 1950; 9:23 (c) Three elevated paths. Aug. 27, 1950; 1:11 (d) Multiplepaths. August 26, 1950; 11:00 (e) Wide angle fill-in. Aug. 26, 1950; 11 (f) Abnormal water reflection. Sept. 8, 1950; 11:28 During these multiple-path conditions, the recordings of the 4195-mctransmission generally show the broad maxima and sharp minima charac-teristic of wave interference. Figure 6(d) shows a case in which the various paths are not completelyseparated while Fig. 6(e) (taken four minutes later) shows that energyis being received almost without variation over a vertical angle of °.This may represent a number of ray paths which would be separable bya narrower-beam antenna, or it may indicate a focussing or trappingphenomenon. Often when the type of transmission illustrated by 6(e)is present, the recorded 4195-mc signal
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