=  NOW 7 1/2 WPM  =  TEXT IS FROM JUNE 2021 QST PAGE 56  =

SSN OF 100 RED LINE.  THIS IS THAT UGLY D LAYER ABSORPTION AGAIN.  IN
ADDITION, BOTH CURVES SHOW A DISTANCE WHERE A STEEP DROP OCCURS.  WITH AN
SSN OF 10, THIS IS AT ABOUT 600 MILES.  WITH AN SSN OF 100, THE STEEP DROP
OFF POINT MOVES TO ABOUT 460 MILES.  THIS REPRESENTS A LOSS OF NEARLY HALF
=  END OF 7 1/2 WPM TEXT  =  QST DE W1AW  <