(3) Pulse modulation: 200 microseconds length, 



70 microseconds rise time 



(4) Pulse repetition rate: 



(a) 6 basic rates: 10 (SS), 12-1/2 (SL), 16-2/3 (SH), 

 20 (S), 25 (L), and 33-1/3 (H) groups per second. 



(b) 7 additional rates are available for each basic rate 



(5) Frequency: 90-110 kc. 



(6) Bandwidth: 99% of total pulse power contained in band of 



90-110 kcps 



(7) Radiated power: 250- 1000 kw 



b . Accuracy and Range 



(1) Usable service range at 100 kw at 50% sampling point 

 and db S/N ratio: 







Nautical Miles 





Winter 



Summer 



No. Hops 



Day 



Night 



Day Night 



Ground Wave 



1300 



800 



1400 800 



1 



1800 



1700 



1700 1700 



2 



2100 



2300 



2300 



(2) Usable service range at 1000 kw at 50% sampling 

 point and db S/N ratio: range increases approx. 

 15-20% over 100-kw range 



(3) Approximate operational accuracy of Ground Wave Sky Wave 

 fix in nautical miles Min Max Min Max 



0.1 0.5 0.5 2 



(4) Number of users: Loran C designed for single or multi- 

 user applications . 



78 



