40 Meter Rotatable Dipole Antennas

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  • Airborne radar. [A century of powered flight: 1903-2003]
    It operatedat a wavelengthof 3.3 meters with a higher transmitter output power, covered a 120-degreesector, and could detecttargets upto 40 miles away. The antenna consisted of four dipoles mounted on the nose fed by a rotating capacitor to provide a conical scan.
  • 100 Years of Radar
    This is to say that in the years 1935– 40 the British, thanks to the maturity of … The former stations of the Chain Home (short for Chain Station Home Service, with acronym C.H.) had large fixed antennas operating at decametric wavelengths, while the stations of … … 200 MHz18 (i.e. a wavelength about one meter and a half), with … The antennas of the C.H. stations were fixed, while those of the C.H.L. stations (array antennas made up by 32 dipoles ) were rotating and mounted on tall trestles.
  • Ultrawideband time-delay steered UHF dipole linear array antenna
    The antenna positioner provided azimuth over elevation over azimuth rotation of the antenna . A log- periodic dipole array antenna was used as the source antenna located approximately 10 meters from the UHF array. The main beam is maintained at the desired 40 -degree elevation angle from broadside over the full …
  • A field/polarization diversity antenna for portable phones
    In the experimental setup, the dipole source antenna was oriented vertically while the AUT was rotated 45 degrees from vertical. The turnstilelscreen setup had a radius of 3.44 meters so the exact distance from the source … … the angle of incidence with respect to the normal of the reflecting screen was approximately 40 degrees.
  • The story behind Finnish telecommunications industry: military radio systems and electronic warfare in Finland during World War II (1939-1945)
    The system was installed on a four-wheel trailer and used a 3 meter paraboloid antenna . The theoretical distance limit was thus 40 km, but receiver sensitivity of 250 kTo lowered this limit. The improvement of angle measuring performance was achieved with a rotating feed dipole in front of the paraboloid.
  • Electromagnetic Field Immunity - A New Parameter in Receiver Design
    * Dipole antenna assumed Unfor- tunately, in its simplest form, it is difficult to use above about 40 MHz because of … For higher frequencies, a modification of the well-known IEC three- meter method for oscillator radiation measurement … During the measurement, the receiver under test is rotated and the height and orientation of the transmitting …
  • Amplitude Scintillation of Radio Star at Ultra-High Frequency
    … and(I has a flux dlensit;5, of 22 X tO 21 watts meters -2 cps--- at … … to 9(0 (lori- zon0 to zenith) for observers at (Columb-TUS, Ohio ( 40 'N latitu(de). Thnlie antenna is eqluatoriallv imounted an-d the dish (can 1e rotated froml- horizoni to horizoni so as to track (Cyguins A fIroml it-s ris- inig to setting. The antenna feed is a half-wave dipole witlh circular ground planie.
  • On the Determination of the Optimum Radiation Angle for Horizontal Antennas
    The reception maximum lay at 40 deg. Here again the rotatable reflector was compared with the fixed reflector at the settings 0 deg., 10 … … reception values in this comparison were not as definite as with the 20- meter wave, because the … … a width of the parabola opening equal to the wavelength, the fixed horizontal antenna with parabolic reflector … 8 As a result of tests of simple vertical dipoles hanging at various heights T. L. Eckersley …
  • Antenna Impedance Measurement by Reflection Method
    With an initial deflection of 40 divisions on the receiving meter caused by direct pickup from the transmitter, a change of about 0.5 division or less resulted from moving the carriage along the track. Tests made with dipole -supporting structures showed that, for thin antennas , the use of dielectric materials near the dipoles, especially at the ends, tended to de- crease the resonant length and impair the response at resonance. … added and when the target is moved, the phase of the reflected wave rotates , causing phase additions …
  • SemCor (finlayson-gwc2014.zip\CICWN-1.0.zip)
    hypocrisy_N|2 laissez_faire_N|2 authoritarian_J|2 central_J|28 womb-to-tomb_J|1 scornful_J|2 why_R|3 advocate_V|9 dislike_N|6 conceal_V|7 southern_J| 40 human_N|12 waist_N|4 deep_south_N|2 … … radio_source_N|3 agreement_N|23 measured_J|9 diameter_N|28 low_temperature_N|4 radio_J|1 radio_reflector_N|1 amplify_V|4 detection_N|6 comprehensive_J|8 emission_N|6 lunar_J|8 deduce_V|9 disk_N|16 lunation_N|2 sinusoidal_J|1 amplitude_N|6 maximum_N|12 full_moon_N|2 pointing_out_N|1 rocklike_J|2 radio_wave_N|2 opaque_J|3 infrared_radiation_N|1 originate_V|16 solar_radiation_N|6 sample_V|7 radio_noise_N|2 meter _N|7 sporadic_J|3 planetary_J|8 observable_J|1 … … optical_J|3 see_also_R|2 observer_N|20 calibrate_V|4 antenna _N|16 receiver_N|11 disagreement_N|5 radio_brightness_N|2 … … rubberlike_J|1 in_other_words_R|5 compress_V|8 heat_sink_N|1 probability_N|32 conformational_entropy_N|2 compressed_J|2 isothermal_J|1 perfect_gas_N|1 surroundings_N|6 proton_magnetic_resonance_N|1 polycrystalline_J|2 paramagnetic_J|13 dipole _N|6 broadening_N|3 asymmetric_J|2 … … plane_J|2 analytic_J|13 inscribe_V|2 inscribed_J|4 circumscribe_V|2 cube_N|3 bounded_J|3 convex_J|1 convexity_N|1 endpoint_N|1 vertex_N|13 diagonal_J|4 paired_J|1 rotate _V|10 clockwise_J|1 intersection_N|12 …