. The California gray whale : papers presented at the California Gray Whale Workshop, Scripps Institution of Oceanography, 21-22 August 1972. Gray whale; Gray whale -- Physiology; Gray whale -- Behavior. Figure 5.—Automatic direction finding antenna (loops) and data acquisition antenna (whip) attached to the belly of a Navy S-2 tracker aircraft. (Photo courtesy of J. S. Leatherwood.) sisted of a solid fiberglass tapered rod onto which was wound a conductor and loading coil. An aluminum tip served both as a seawater contact and as a section whose length could be trimmed tor peak field stre
. The California gray whale : papers presented at the California Gray Whale Workshop, Scripps Institution of Oceanography, 21-22 August 1972. Gray whale; Gray whale -- Physiology; Gray whale -- Behavior. Figure 5.—Automatic direction finding antenna (loops) and data acquisition antenna (whip) attached to the belly of a Navy S-2 tracker aircraft. (Photo courtesy of J. S. Leatherwood.) sisted of a solid fiberglass tapered rod onto which was wound a conductor and loading coil. An aluminum tip served both as a seawater contact and as a section whose length could be trimmed tor peak field strength. A proprietars coating protected the con- ductor and coil from seawater. The antenna was entirely successful on Delphiinis species (Evans, 1971). but problems were encountered when a similar design was used on captive whales such as pilot whales and killer whales. The captive whales invariably broke the antennas by rubbing on structures or boats and in the instance of the release of a pilot whale into the wild, the antenna was broken by sea- weed. Subsequently, a spring-wire antenna was designed which could be severely bent without catastrophic damage and has been used success- fully on the aforementioned whales (Martin. Evans, and Bowers. 1971). This type of antenna was used on the gray whale pack. Subsequent simula- tions of various types of damage to this antenna indicate that modifica- tions would be in order before em- ploying this type of antenna again. Specifically, the arrangement of the spring at the base should be changed to allow the antenna to be bent double against the transmitter case without damage. The antenna should be length- ened somewhat to reduce the variation in impedance for a given variation in the relative position of the ground plane (sea surface) and the loading coil should be fully encapsulated in the nonmetallic antenna's structure to completely eliminate the abrasion damage potential. Data Receiving System The data receiving and recording sy
Size: 2423px × 1032px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookcollectionbiodiversit, booksubjectgraywhale
