‰  NOW 35 WPM  ‰   TEXT IS FROM SEPTEMBER 2013 QST  PAGE 39‰

FOUR DIRECTIONS, AGAIN ON THE HYBRID GROUND.  THE NORMALIZED CURRENTS WHICH
SOMETIMES DEVIATED FROM THE INTENDED VALUES ARE LISTED IN TABLE 7, THE
REASONS FOR THIS WILL BE DISCUSSED LATER.  THE MODELED POLAR PATTERNS USING
THE ACTUAL DRIVE CURRENTS ARE SHOWN IN FIGURE 13 THIS AND THE FOLLOWING
FIGURES CAN BE FOUND AT WWW. ARRL.  ORG QST IN DEPTH.  THERE IS GOOD
AGREEMENT BETWEEN THESE AND THOSE THAT WERE MEASURED.  THE FRONT TO BACK
RATIOS SPAN THE RANGE FROM 20R6 TO 14R7 DB AND ARE SOMEWHAT SMALLER AND
LESS CONSISTENT THAN THOSE MEASURED.  THE BEAM WIDTHS ARE IN VERY GOOD
AGREEMENT WITH THE MEASUREMENTS.  PREDICTED, BUT NOT MEASURED, ARE THE
FORWARD GAINS.  THESE ARE VERY SIMILAR FOR THE FOUR DIRECTIONS, RANGING
BETWEEN 7R00 AND 7R36 DBI AS SHOWN IN FIGURE 14.  THE SIMULATION ALSO
PROVIDES THE ELEVATION OF THE MAIN LOBE ABOVE THE HORIZON.  ALTHOUGH THE
ONLY PATTERN PRESENTED HERE, FIGURE 15, IS FOR THE NE DIRECTION, THE PEAK
ELEVATION IS CLOSE TO 20 FOR ALL BEAM HEADINGS, WITH A HALF POWER VERTICAL
BEAM WIDTH OF 35.  A VERY USEFUL INDICATION OF THE INSENSITIVITY TO
FREQUENCY ACROSS THE 21 MHZ BAND IS PROVIDED BY THE TWO NE POLAR PATTERNS
IN FIGURE 16.  THIS 2 CHANGE OF FREQUENCY CAUSED A CHANGE OF ONLY 0R5 DB IN
THE FRONT TO BACK RATIO AND A NEGLIGIBLE CHANGE IN GAIN OF ONLY 0R05 DB.
DISCUSSION THE ANTENNAS BEHAVIOR ON THE HYBRID GROUND, BUT WITH A PERFECT
‰  END OF 35 WPM TEXT  ‰  QST DE W1AW  ƒ