Determination of RC-120-B Facsimile Equipment Characteristics
Abstract
The operation of the RC-120-B Facsimile Equipment is briefly described after which the characteristics of the various component units are presented so as to permit an evaluation of each unit's effect on the overall system characteristics. The system definition is shown to be limited by the transmitter aperture and the 1800 cycle carrier frequency. It is also pointed out that an increase in definition or speed of transmission is not feasible over existing long distance radio circuits due to multipath effects. The halftone characteristics of the various units are combined to give the system halftone characteristics in a manner which permits a qualitative evaluation of the distortion introduced by the various units. The effect of random noise is discussed as well as the optimum contrast range which is shown theoretically to be around 15 to 20 db. Experimental evi4enceis included which shows a range of 15 db to be superior to the 8 db range normally employed with this equipment.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 26, 1946
- Accession Number
- AD1199700
Entities
People
- A. D. Watt
Organizations
- United States Naval Research Laboratory