4 . SUMMARY 



a. Type of System 



(1) Circular plot single-user system. 



(2) Number of shore stations required: master and two slaves 

 (r ed and green) . 



(3) Length of base line: 60 miles or less. 



(4) Frequency range: 112-180 kc (approximately). 



(5) Transmitted power: 350 watt cw shipboard -mounted transmitter, 



(6) Mobile antenna: 45-feet tubular sections . 



(7) Range: 6-175 nautical miles (approximately). 



(8) Receiver power requirements: 250 watts (approximately). 



(9) Shipboard and shore station power requirements: 2 kw. 



(10) Receiver readout: 4 dial Decometer Unit providing (Decca 

 Mark 5 shipborne set) Lambda Identification System - Marine 

 automatic track plotter provides continuous position plot in 

 rectilinear coordinates . 



b. Range and Accuracy 



(1) Usable service distance: 175 nautical miles . 



(2) Approximate 95%, rms radial error at 40 nautical miles: 

 25 - 60 feet . 



(3) Approximate 60%, rms radial error at 175 nautical miles: 

 300 feet. 



REFERENCE 



C. Powell, "Radio Aids to Hydrography," Wireless World, July, 1960, 



109 



artbur ZD.llittlf.Knr. 



