Scaled-model Measurements on a Nested-tandem Array of Four Rhombic Antennas PDF Download
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Author: E. L. Kilpatrick Publisher: ISBN: Category : Antenna arrays Languages : en Pages : 128
Book Description
Antenna with high gains at low elevation angles are important to long distance HF communication. With application to an 11,070-km circuit between Washington, D.C. and Asmara, Ethiopia, in view, a design for an antenna consisting of four rhombic elements in a nested-tandem configuration was proposed. The overall length of the antenna was 442.8 m (1452.6 ft), the maximum height, 73.2 m (240 ft). Its nominal operating frequency range was from 6 to 19 MHz. Power gain was computed as a function of frequency, elevation angle, and azimuthal direction. Scaled-model measurements, using 200:1 scaling factor, were carried out to verify the computations. Calculations showed the maximum gain to be 26.5 dB at 14.5 MHz at an angle of about 4.5°. The computed performance deteriorated markedly above 18 MHz. The measurements confirmed the computations at the lower frequencies and showed the deterioration in the performance near the upper frequency end to begin at a lower frequency than computer.
Author: E. L. Kilpatrick Publisher: ISBN: Category : Antenna arrays Languages : en Pages : 128
Book Description
Antenna with high gains at low elevation angles are important to long distance HF communication. With application to an 11,070-km circuit between Washington, D.C. and Asmara, Ethiopia, in view, a design for an antenna consisting of four rhombic elements in a nested-tandem configuration was proposed. The overall length of the antenna was 442.8 m (1452.6 ft), the maximum height, 73.2 m (240 ft). Its nominal operating frequency range was from 6 to 19 MHz. Power gain was computed as a function of frequency, elevation angle, and azimuthal direction. Scaled-model measurements, using 200:1 scaling factor, were carried out to verify the computations. Calculations showed the maximum gain to be 26.5 dB at 14.5 MHz at an angle of about 4.5°. The computed performance deteriorated markedly above 18 MHz. The measurements confirmed the computations at the lower frequencies and showed the deterioration in the performance near the upper frequency end to begin at a lower frequency than computer.
Author: Fred Fehsenfeld Publisher: ISBN: Category : Afterglow (Physics) Languages : en Pages : 164
Book Description
The reaction rate constants measured to August, 1969 in the ESSA flowing afterglow system have been compiled and tabulated in this report. The references to original publications are included along with reference to several published reviews on specialized aspects of ion-molecule reactions. Because of the large number of measured rate constants (several hundred) this report should be useful as a reference source and "finding list."
Author: E. L. Kilpatrick
Author: E. L. Kilpatrick
Author: Fred Fehsenfeld
Author: E. L. Kilpatrick
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Author: United States. Environmental Science Services Administration
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Author: United States. Dept. of Commerce
Author: United States. Department of Commerce. Office of Publications
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