A Low-Inertia Recorder for Directive Antenna Patterns
Abstract
Automatic recording of antenna radiation patterns by equipment possessing mechanical inertia is limited in speed and subject to misuse when these patterns are shar or contain nulls. To meet this problem a recorder has been developed according to a design which eliminates mechanical inertias. Received signal intensity is converted into time logarithmically and recording is accomplished by a spark from a uniformly translated paper. Point position then gives signal intensity logarithmically and paper position gives antenna orientation. The rectangular presentation provides eight inches for 40 decibels of antenna signal to a square law detector, and arbitrarily ten inches for the angular range employed, say 180 deg. The rise time corresponds to 400 inches per second writing speed, but the writing speed actually realizable depends upon the marking rate of the recorder and the density of points required. Thus the recorder is limited in continuity of presentation rather than in accuracy of presentation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 27, 1949
- Accession Number
- AD1214927
Entities
People
- O. A. Tyson
Organizations
- United States Naval Research Laboratory