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                                  READABILITY                                
                                                                             
                       1 -- Unreadable.                                      
                       2 -- Barely Readable                                  
                       3 -- Readable - considerable difficulty               
                       4 -- Readable - almost no difficulty                  
                       5 -- Perfect copy                                     
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               STRENGTH                              TONE                   
                                                                            
   2 -- Very Weak Signal                2 -- Very rough ac - harsh          
   3 -- Weak Signal                     3 -- Rough ac - not filtered        
   4 -- Fair Signal                     4 -- Rough note some filtering      
   5 -- Fairly Good Signal              5 -- Strong ac ripple               
   6 -- Good Signal                     6 -- Definite trace of ac ripple    
   7 -- Moderately Strong Signal        7 -- Almost pure, trace of ripple   
   8 -- Strong Signal                   8 -- Near perfect, some modulation  
   9 -- Extremely Strong Signal         9 -- Perfect tone                   
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   X - Crystal Steady           C - Chirps               K - Key clicks      
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                         Press <SPACE> to continue                           
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