Accession Number : ADD000275

Title :   VLF Frequency Diversity Trailing Wire Transmitting Antenna.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Bickel,John E

Report Date : 23 Apr 1974

Pagination or Media Count : 4

Abstract : The patent describes an aircraft VLF/LF frequency diversity transmitting antenna. The antenna comprises a long trailing wire of length approximately equal to one-half the wavelength of the lower of two operating frequencies. A resonant circuit is connected to the wire at a distance from the aircraft and transmitter approximately equal to one-half the wavelength of the higher of the two frequencies. The resonant circuit is tuned to one of the two frequencies to effectively connect or disconnect the portion of the wire between the resonant circuit and the far end of the wire in accordance with which of the two frequencies is exciting the trailing wire, whereby the antenna reactance is changed to facilitate retuning.

Descriptors :   *Aircraft antennas, *Patents, Very low frequency, Low frequency, Frequency diversity, Wire, Towed bodies

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE