Accession Number:

AD0640078

Title:

IMPEDANCE MEASUREMENTS OF UNBALANCED ROCKET ANTENNAS NEAR THE EARTH'S SURFACE.

Descriptive Note:

Corporate Author:

UTAH UNIV SALT LAKE CITY UPPER AIR RESEARCH LABS

Personal Author(s):

Report Date:

1966-08-01

Pagination or Media Count:

75.0

Abstract:

An investigation was conducted to explore the possibility of accurately determining the free space impedance of a single, unbalanced, whip antenna mounted on a rocket. A system was developed to measure the impedance without any external electrical connection to the rocket. A method of suspending the rocket model was developed so that an error of less than 2 ohms was introduced into the impedance of the electrically short antenna by surrounding objects including the earth. The effects of frequency and geometry of the rocket-antenna system on the minimum height at which the rocket can be supported above the ground for accurate measurements were investigated. It was found that for antennas between 2 and 6 meters, rocket diameters between 0.2 and 0.5 meters, and frequencies between 10 and 12 Mhz, that a support height of 2.5 meters for the rocket model was sufficient for accurate measurements. Author

Subject Categories:

  • Electrical and Electronic Equipment

Distribution Statement:

APPROVED FOR PUBLIC RELEASE