=  NOW 25 WPM  =  TEXT IS FROM MAY 2024 QST  PAGE 36 =

STACKED ARRAYS ALSO TEND TO REDUCE THE AMOUNT OF FADING, QSB, ON THE
RECEIVED SIGNAL.  QSB IS CAUSED BY A SIGNAL TAKING TWO DIFFERENT PATHS THAT
ARRIVE AT DIFFERENT ANGLES.  THE TWO SIGNALS CAN MOMENTARILY CANCEL AND
CAUSE DROPOUTS IN RECEPTION.  IF YOU NULL ONE OF THE PATHS, THE QSB WILL GO
AWAY. TO BETTER UNDERSTAND WHICH HEIGHTS AND PHASE COMBINATIONS PRODUCE A
GIVEN TOA, A COMPUTER ANALYSIS IS REQUIRED.  AN HFTA ANALYSIS OF MY STACK OF
THREE TRIBAND YAGIS SHOWED THE BEST COMBINATIONS FOR SPECIFIC TOAS, AND I
SAW THAT THE BEST COMBINATION FOR 20 METERS IS AS FOLLOWS. THE STACKED ARRAY
IN PRACTICE. AFTER INSTALLING AND OPERATING A HIGH PERFORMANCE, PHASED
STACKED ARRAY ANTENNA SYSTEM, I NOT ONLY CAN CHANGE THE AZIMUTH DIRECTION OF
MY ARRAY, BUT I CAN ALSO CHANGE THE VERTICAL ELEVATION TOA BY SWITCHING
BETWEEN DIFFERENT ANTENNA COMBINATIONS AND/OR PHASE RELATIONSHIPS BETWEEN
THE THREE STACKED TRIBANDERS.  THE STACKED ARRAY HAS BEEN EXTREMELY EXCITING
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