Operating ranges depend on the usual factors, including propagation 

 path, ambient radio noise, sky-wave interference and its variations with season 

 and time of day, receiver sensitivity, and transmitter power. Maximum ranges 

 of 100-200 miles are usual under all but the most severe conditions. The newer 

 miniaturized equipment is rated for 25 miles but has been operated at ranges in 

 excess of 60 miles. 



4. SUMMARY 



a. Type of System 



(1) Phase comparison of audio beat note. 



(2) Direct-distance (circular) or hyperbolic coordinates. 



(3) Operating frequency: 1.6 - 5.0 mc. 



(4) Provision for lane identification possible but not usual. 



(5) Operating ranges: 



High-powered Raydist 100-200 nautical miles 



Miniaturized (transistorized) 25- 60 nautical miles 



(6) Accuracy of 1 : 5000 with a probable error of 1-3 meters. 



b. Equipment Characteristics (DM Raydist only) 



(1) High -Powered System 



RED STATION 



Receiver Unit 



AM Transmitter 



CW Transmitter 



Two Antenna Loading Boxes 



Power Required 



17 X 11 X 25 inches 

 17 X 11 X 25 inches 

 17 X 11 X 25 inches 

 6 X 12 X 25 inches 

 950 w, 60 cps, 110 V, ac. 



63 pounds 

 95 pounds 

 95 pounds 

 12 pounds 



GREEN STATION 



Receiver Unit 

 AM Transmitter 

 Antenna Loading Box 

 Antennas and Accessories 

 Power Required 



17 X 11 X 25 inches 



17 X 11 X 25 inches 



6 X 12 X 12 inches 



700 w, 60 cps, 110 V ac. 



63 pounds 



95 pounds 



12 pounds 



225 pounds 



131 



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