4. SUMMARY 



a . Type of System 



(1) Pulsed phase -difference circular plot. 



(2) Number of stations required: 2 shore stations, 

 1 shipboard station. 



(3) Length of base line: 10-50 miles. 



(4) Operators required: at ground stations and on 

 board ship. 



(5) Transmitter pulse width: l/4microsec. 

 rectangular . 



(6) Transmitter pulse repetition rate: 930.09/second 

 (time interval between two pulses thus corresponds 

 to distance of 100 miles). 



(7) Shipboard transmitter and antenna frequency range: 

 210-260 mc. 



(8) Shipboard receiver and antenna frequency range: 

 290-320 mc. 



(9) Ground station transmitter and antenna frequency 

 range: 290-320 mc. 



(10) Ground station receiver and antenna frequency range: 

 210-260 mc. 



(11) Shipboard and ground station peak pulse power level: 

 12-15 kw. 



(12) Antenna systems: separate receiving and transmitting 

 dipoles required. Reflectors used on ground station 

 equipment where distances are greater than 50 miles. 



(13) Frequencies generally used: 230, 250, and 310 mc. 



(14) Alternating transmission rate between the two ground 

 stations: 10 times/second. 



161 



arthur Zn.ltittlf.ilnr. 



