Simple methods for calculating the azimuthal coverage of HF directional antennas
Abstract
The aximuthal coverage of HF directional antennas are calculated and examples are given. Sperical trigonometry formulas employing auxiliary quantities are emphasized because of their suitability for use with simple hand held electronic calculators. The relationships between sides and angles of oblique spherical triangles, collated from several sources, are listed and the value of applying tests based on these relationships prior to making detailed solutions of spherical triangle problems is demonstrated.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 February 1981
 Bibcode:
 1981STIN...8230434M
 Keywords:

 Azimuth;
 Directional Antennas;
 High Frequencies;
 Formulas (Mathematics);
 Spherical Coordinates;
 Triangles;
 Trigonometry;
 Communications and Radar