Rca1948FrequencyModu.. - The New Jersey Antique Radio Club

PYLON ANTENNA 195is,in effect, made up of a large number of circular elements, each oneof which is a radiating member. When power is fed to the slot,Figure 4, the slot functions as a transmission line, and currents flowaround the circular paths shown by the dotted line.Early tests were conducted on 200-mc. models, fabricated of lightwire screen. Although it may appear that the choice of a radiatortPig. 1—Single pylon antennasection.Fig. 2—A 4-section pylon antenna,mounted on the roof of a building.y2wavelength in circumference and 1 wavelength long was an obviousone for such an antenna, this is by no means true. A given set ofdimensions for a cylinder yields a radiator which can be operated atany one of a number of nodes. The cylinder diameter is intimatelyassociated with the horizontal pattern. On the other hand, the diameteris also a controlling factor in the length of cylinder for resonance.