[600MRG] Quartile Method of Characterizing 630m Propagation Paths: Last Night's Results. Part 3A of 3.

[James Hollander]

   This final Part 3 of the post shows Variability V and shows dB Tilt T calculated for various 630m paths as they existed last night.  See if your station is listed!  
   
73,  Jim H  W5EST  
   
      
   
   Some data examples use last night’s 2/11/15 SNR information.  You simply do the WSPR database query and eyeball off the SNR sort.  (If data is insignificant then path reciprocity is assumed, and Variability V and dB Tilt T are meaningless.)  "Nr" is number of decodes.  Quartile SNRs are in the middle columns.  
   
      
   
   The XGP/XKA path was same both ways last night, as far as these Variability and dB Tilt statistics can say.  
   
   Direction               Time Z  Nr   SNRij 3/4   SNRij 1/2    SNRij1/4   V      T  
   
   XGP   to  XKA 0346-1152  32    -17.5       -20.5          -23          5.5    0.5  
   
   XGP frm XKA 0406-1142  33    -21          -24             -26.5       5.5    0.5  
   
      
   
    The XGP/XND path also looks same both ways last night. I ignored XND's multi-decodes that gave -20s dB.  Numbers of decodes were about the same too.  
   
   Direction               Time     Nr   SNRij 3/4   SNRij 1/2    SNRij1/4   V      T  
   
   XGP   to  XND 0414-1004  44*    -1            -4               -8           7      -1   (> -16dB)  
   
   XGP frm XND 0348-1006  46      0.5          -4                -7        7.5     1.5  
   
      
   
    Too few decodes made the XKA/XND path statistics V and T insignificant. Assume reciprocal.  
   
   Direction               Time     Nr   SNRij 3/4   SNRij 1/2    SNRij1/4   V      T  
   
   XKA   to  XND 0354-0654   4    -27          -27            -27.5        0.5    -0.5 (insignif)  
   
   XKA frm XND 0542-0856   4    -24          -24.5         -25.5        1.5    -0.5 (insignif)  
   
      
   
   The XXM/XGP path looks the same both ways last night. XXM had less than half the number of decodes that XGP obtained, but the quartile method worked just fine to get V and T anyhow.   
   
   Direction               Time     Nr   SNRij 3/4   SNRij 1/2    SNRij1/4   V      T  
   
   XXM  to  XGP 0124-1028  78    +4            +1             -1.5         5.5     0.5   
   
   XXM frm XGP 0302-1050  33    -9          -11.5         -14.5         5.5    -0.5   
   
      
   
   (More tables. Continued in Part 3B)