Good 



o 



< 



D 



o 

 u 



< 



Fair 



Poor 







® 



50 



500 



5000 



RANGE 



(^J Little dependence on time-of-day and signal frequency 



Q2) Depends on time-of-day, and signal frequency must be below 5-7 mHz 



(3) Most of patti must be in daylight, and signal frequency must be above 5-7 mHz 



GOOD: 1° accuracy, or better, on ground wave, CEP 0.9 nmi at 50 miles 



FAIR: 3° accuracy, or better, with signal processing and large antennas: CEP 50 nmi to 1000 nmi 



POOR: 5° accuracy, erratic and fading signal; CEP 25 nmi at 300 nmi 



FIGURE 9 GROUND-BASED HF/DF PERFORMANCE 



83 



