Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

190 FREQUENCY MODULATION, Volume Isections were readjusted to again match the main feed line. Thenobservations were again made of the field intensity as the pole wasrotated.a circular pattern.Three or four adjustments of this type are sufficient to obtainMeasurements of a typical well-adjusted turnstile are shown inFigure 11.antenna.This may be regarded as the horizontal field pattern of theVertical Field Intensity PatternsWith the pole mounted horizontally above the ground, we wereafforded an excellent opportunity to measure the vertical radiationpattern by simply moving the field-intensity meter on the circumference