Mountain Obstacle Diffraction Measurements at 751 Mc/s and 9.2 Gc/s

Publisher: John Wiley & Sons Inc

E-ISSN: 1944-799x|1|1|61-78

ISSN: 0048-6604

Source: RADIO SCIENCE, Vol.1, Iss.1, 1966-01, pp. : 61-78

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Abstract

This paper contains results of a measurement program on 751 Mc/s and 9.2 Gc/s using a long mountain‐obstacle diffraction path in Colorado. Data are analyzed and evaluated in terms of long‐term and short‐term variability, correlation coefficients between carrier envelopes received on spaced antennas, and comparison of a priori predicted and measured cumulative distributions of hourly transmission loss medians. Results show beuer agreement between predictions and measurements on 751 Mc/s than on 9.2 Gc/s. Short‐term (within‐the‐hour) variations in signal level on 751 Mc/s can be characterized as prolonged space‐wave fadeouts, whereas such variations on 9.2 Gc/s very frequently show characteristics of a Rayleigh‐distributed signal.