turnstile antenna การใช้

• This is the case, for instance, between the crossed dipoles used in the turnstile antenna.
• A turnstile antenna with its four arms in the horizontal plane, likewise transmits horizontally polarized radiation toward the horizon.
• Axial mode turnstile antennas are often used for satellite and missile antennas, since circular polarization is used in satellite communication.
• Transmitting antennas consisted of two fiberglass slot antennas in the body of the satellite itself and four flexible whips forming a turnstile antenna.
• Specialized normal mode turnstile antennas called " superturnstile " or " batwing antennas " are used as television broadcasting antennas.
• Dipoles may be used as standalone antennas themselves, but they are also employed as reflective array, turnstile antenna, log periodic antenna, and phased array.
• Since the first turnstiles invented by Brown operated in this mode, the normal mode turnstile is occasionally called the " George Brown turnstile antenna ".
• However, when that same turnstile antenna is used in the " axial mode " ( upwards, for the same horizontally-oriented structure ) its radiation is circularly polarized.
• High gain antennas for helical, and turnstile antennas are used since satellites typically employ circular polarization which is not sensitive to the relative orientation of the transmitting and receiving antennas.
• Data from the scientific instruments was transmitted to the ground by two MHz, and four flexible whips forming a turnstile antenna were fed by a 10 milliwatt transmitter operating on 108.00 MHz.
• In 1935 a commission to produce an antenna with omnidirectional radiation, i . e . equal at all points of the compass, led him to develop the turnstile antenna, so-called because it looked like a turnstile.
• A "'turnstile antenna "', or crossed-dipole antenna, is a radio antenna consisting of a set of two identical dipole antennas mounted at right angles to each other and fed in phase quadrature; the two currents applied to the dipoles are 90?out of phase.
• The seismometer was encased in the lunar capsule along with an amplifier, a 50 mW transmitter, voltage control, a turnstile antenna, and six silver-cadmium batteries capable of operating the lunar capsule transmitter for 30 days, all designed to land on the Moon at 130 to 160 km / h ( 80 to 100 mph ).
• The seismometer was encased in the lunar capsule along with an amplifier, a 50-milliwatt transmitter, voltage control, a turnstile antenna, and 6 silver-cadmium batteries capable of operating the lunar capsule transmitter for 30 days, all designed to land on the Moon at 130 to 160 km / h ( 80 to 100 mph ).
• The seismometer ( code-named " Tonto " ) was encased in the lunar capsule along with an amplifier, a 50 mW transmitter, voltage control, a turnstile antenna, and six silver-cadmium batteries capable of operating the lunar capsule transmitter for 30 days, all designed to land on the Moon at 130 to 160 km / h ( 80 to 100 mph ).