REAL WORLD COMPARISON MEASUREMENTS Clare - VE3NPC QCWA Dinner Nov. 21, 2006. HELIX ANTENNAS. Early Helix – 2 x 10 Turns. 1989. 2 x 15 Turn 70 cm Helix . 1991 ?. AO-13 Antennas. About 1994. AO-40 Antennas. 2001. 13 and 23 cm Helix Arrays. 2003 .
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0.8 > C > 1.2 C = circumference in wavelengths
12 < a > 14 a = pitch angle in degrees
But used C = 1 wavelength and a =12.5 degrees
The NEC designs concluded that :
- for a given number of turns there was a
particular value of circumference and
pitch angle that would provide peak gain.
- as the number of turns was increased the
increase in gain soon leveled off.
Kraus 10 turns
Emerson 10 turns
Emerson 12 turns
Kraus 13 turns
Kraus 26 turns
Emerson 24 turns
60 k kilometers