Accession Number : AD0282100

Title :   IONOSPHERIC RESEARCH AND PROPAGATION STUDIES.

Descriptive Note : Quarterly progress rept. no. 8, 1 Apr-30 Jun 62.

Corporate Author : ILLINOIS UNIV URBANA ELECTRICAL ENGINEERING RESEARCH LAB

Personal Author(s) : Webb ,H. D. ; Davidson,R. A.

Report Date : 30 JUN 1962

Pagination or Media Count : 14

Abstract : A calibration program was started for measuring the beamwidths and gains of the antenna at approximately 50 mc intervals from 300 to 1200 mc, using the sum as a radio source and methods described in previous reports. Cable losses are also being measured over this range of frequencies. It appears that the large log-periodic feed is usable above the design frequency of 500 mc, possibly up to 700mc. Signals received by reflection from meteor bursts should be at the same frequency as the transmitted frequency except for a small Doppler frequency component due to ionospheric winds. Moon reflected signals were received on 47 days during the period for a total of approximately 470 hours. The heavy load on the computer and the shortage of personel prevented processing the data into a form suitable for analysis and interpretation. The angle between the receiving and transmitting antenna feeds is larger and varies more than had been anticipated. Some methods proposed to resolve the ambiguity for moon reflections for transmissions at one frequency are shown to be fallacious. It is shown that at a given time data from two receiving stations may be used to resolve the ambiguity, provided that the ionosphere is the same above the two locations. (Author)

Descriptors :   (*IONOSPHERE, *ANTENNAS), WIND, RADIO WAVES, REFLECTION, MOON, WAVE PROPAGATION, BEAMS

Distribution Statement : APPROVED FOR PUBLIC RELEASE