APPENDIX B 



ADVISORY MINIMUM SPECIFICATIONS FOR MARINE RADAR 



EQUIPMENT 



Advisory minimum specification Brief No. 1 (3-centimeter Radar) 

 Advisory minimum specification Brief No. 1 (10-centimeter Radar) 



Advisory minimum specification Brief No. 2 (Search Radar) 

 Advisory minimum specification Brief No. 3 (Anti-Collision Radar) 



The minimum Radar, Loran and radio direction-finder equipment advisory 

 specifications constituting this appendix are to serve only as a guide, for 

 voluntary use by mariners, airmen and manufacturers interested in electronic 

 navigational aid equipment. 



It is inescapable that the user's electronic equipment must be coordinated 

 in design with the electronic navigational aids system, whether it be Loran, 

 radiobeacon or Radar-beacon aids. 



It is hoped that publication of the specifications will be of some value to 

 both the producer and user of electronic navigational equipment to the end 

 that the best possible use of the available navigational aid systems and 

 equipment is realized. 



ADVISORY MINIMUM SPECIFICATIONS FOR MARINE RADAR EQUIPMENT 

 Advisory Minimum Specification Brief No. I 13-centimeter Radar) 



I. Designation. — 



Surface search and navigational Radar. 



II. General Description. — 



This is to be a 3-centimeter surface search Radar, primarily designed 

 for ocean-going vessels to provide early warning of approaching vessels 

 and navigational dangers on the open seas as well as high resolution for 

 navigation in restricted waters. 



///. Operational Requirements. — 



Designed for operation by bridge personnel with little or no technical 

 training. The operation of this equipment must not cause interference 

 with other aids to navigation or to communication equipment on board 

 and should be adequately shielded to prevent interference to the Radar from 

 other electronic apparatus normally carried. The indicator unit shall not 

 cause appreciable error in a magnetic compass when located more than 

 6 feet from the indicator nor shall other components cause error when 

 located a distance of more than 15 feet. Mechanical noise from the indicator 

 shall not be audible for more than 20 feet in still air. 



IV. Performance. — 

 Range: 



Maximum — 30 miles. 



Minimum — 100 yards. 

 Resolution: 



A properly designed Radar with pulse length and antenna beam width 

 as elsewhere prescribed in this specification brief should give a range 

 resolution of 100 yards and a bearing resolution of 2° on the shortest 

 sweep scale. 



V. Indication and Output Data. — 

 Indicator: 



At least 7-inch PPI Scope (plan-position-indicator) . Sweep linearity 

 shall not deviate more than ±2 percent except that the first and last 

 10 percent of the sweep may deviate by ±5 percent. 

 Range scales: 



Capable of being set as desired by purchaser within the following limits: 

 2-5 miles; 4-15 miles; 15-30 miles; a positive range scale indicator is 

 to be provided. 



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