Accession Number : AD0640079

Title :   GEAR-RATIOS FOR CURSORS OF PPI'S.

Descriptive Note : Technical rept.,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD PSYCHOLOGICAL LAB

Personal Author(s) : McCleary,R. A. ; Morgan,C. T.

Report Date : 10 JUN 1949

Pagination or Media Count : 10

Abstract : There is an optimum gear-ratio for operating a remote PPI. The optimum, however, depends upon a number of factors--the most important of which is the angular distance through which the cursor must be moved to get it on the pip. If the distance is very short, say, 15 degrees, the optimum is high--in the neighborhood of 20 revolutions of the crank for one revolution of the cursor. If the distance is longer, say, 165 degrees, the optimum is much smaller--about 5:1. If one averages all distances likely to be encountered in normal operation of PPI's, the optimum is still about 5:1. This, therefore, is the recommended ratio for typical radar operation. (Author)

Descriptors :   (*PLAN POSITION INDICATORS, HUMAN FACTORS ENGINEERING), HAND CRANKS, RADAR OPERATORS, RADAR EQUIPMENT, GEARS

Subject Categories : Active & Passive Radar Detection & Equipment
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE