Accession Number : AD0486466

Title :   RESEARCH-ENGINEERING AND SUPPORT FOR TROPICAL COMMUNICATIONS.

Descriptive Note : Semiannual rept. no. 5, 1 Apr-30 Sep 65,

Corporate Author : STANFORD RESEARCH INST MENLO PARK CA

Personal Author(s) : Hagn, G. H. ; Parker, H. W. ; Younker, E. L.

Report Date : MAY 1966

Pagination or Media Count : 80

Abstract : Communications research in a tropical environment is needed to develop improved equipment and techniques for use by military forces in Southeast Asia and other areas of similar environment. This report covers the following effort in Thailand during 1 April through 30 September 1965: RF noise measurement study was continued; a series of HF antenna orientation measurements were conducted; Faraday rotation experiments were continued using data from satellites Transit 4A and Beacon S66; ionospheric data from a C-2 sounder in Bangkok, Thailand has continued to be compiled and published in report form; a program was initiated using oblique sounders to investigate tropical communications over short ionospheric paths at HF; Xeledop antenna pattern measurements of selected field antennas were made over flat terrain and in selected forest areas in CONUS. A theoretical model for a short dipole in foliage was developed and tested successfully at HF; and methods of measuring electrical properties of foliage, and of ground constants in the presence of foliage were developed.

Descriptors :   (*COMMUNICATION AND RADIO SYSTEMS, TROPICAL REGIONS), NOISE(RADIO), RADIOFREQUENCY, MEASUREMENT, ENVIRONMENTAL TESTS, TROPICAL TESTS, ANTENNAS, RADIO INTERFERENCE, THAILAND, MAGNETIC PROPERTIES, HIGH FREQUENCY, VERY HIGH FREQUENCY, ANTENNA RADIATION PATTERNS, ATMOSPHERIC SOUNDING.

Subject Categories : Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE