(3) Pulse modulation: 45 microseconds lengtii, 



21 microseconds rise time 



(4) Pulse repetition rate: 



(a) H rate = 33 - 34 . 11 pps in seven steps 

 Recurrence interval - 30, 000 - 29, 300 microseconds 

 in seven intervals 



(b) L rate = 25 - 25 .44 pps in seven steps 

 Recurrence interval - 40, 000 - 39, 000 microseconds 

 in seven intervals 



(c) S rate = 20-20.28 pps in seven steps 

 Recurrence interval = 50, 000 - 49, 300 microseconds 

 in seven intervals 



(5) Frequency channels: 



Channel 1 = 1950 kc 

 Channel 2 = 1850 kc 

 Channel 3 = 1900 kc 

 Channel 4 = 1750 kc 



(6) Bandwidth: 40 kc 



(7) Radiated power: 160 kw peak, for older installations 



1000 kw peak where high-power amplifiers 

 have been installed 



(8) Number of Loran-A stations: 69 located throughout world 



b. Accuracy and Range 



Daytime Ground Nighttime 

 Wave Sky Wave 



(1) Usable service range 700-900 nm approx. 1400 nm 



(2) Approximate accuracy LOP 0.5-l.Onm 3-6 nm 



(3) Time required to obtain LOP: 2 - 3 minutes 



■ (4) Minimum usable S/N ratio: not less than 2/1 



with a manual match. Automatic tracking receiver 

 will track to S/N ratio of about 1/2 or 1/3 



(5) Number of users: Loran-A designed for multi -user application. 



66 



artbiir Zn.lLittlcIlnr. 



