PROPAGATION STUDIES AT 8.6-MILLIMETER WAVELENGTH ON 3.5-, 7- AND 12-MILE PATHS
Abstract
A reflex klystron (Raytheon QK 291) operating as a CW generator was used as a signal source at the transmitter. The relative power output was monitored by a bolometer and a conventional bridge circuit. Transmissions of the 8.6-mm waves over 3.5-, 7- and 12-mi paths were within 3.5 db of the free-space value for 36 sets of measurements when rain did not occur. Large transmission losses resulted when showers occurred along the path. The losses were small during a fog. The measured signal strength was lower in 34 out of 36 cases (but by not more than 1.7 db) than the value obtained by subtracting the water-vapor and oxygen-absorption losses from the free-space values. The time fluctuation ranged from 0.2 to 5 db; the larger variations were associated with days on which large-intensity fluctuations of the index of refraction would be expected.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 26, 1953
- Accession Number
- AD0015299
Entities
People
- A. W. Straiton
- C. D. Tipton
- C. W. Tolbert
Organizations
- University of Texas at Austin