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  2. Marker beacon - Wikipedia

    en.wikipedia.org/wiki/Marker_beacon

    It is typically located about 1 NM (1.85 km) inside the point where the glideslope intercepts the intermediate altitude and transmits a 400 Hz tone signal on a low-powered (3 watts), 75 MHz carrier signal. Its antenna is highly directional, and is pointed straight up. The valid signal area is a 2,400 ft (730 m) × 4,200 ft (1,280 m) ellipse (as ...

  3. Glide path - Wikipedia

    en.wikipedia.org/wiki/Glide_path

    Emission patterns of the localizer and glide slope signals Glide slope station for runway 09R at Hannover Airport in Germany. In aviation, instrument landing system glide path, commonly referred to as a glide path (G/P) or glide slope (G/S), is "a system of vertical guidance embodied in the instrument landing system which indicates the vertical deviation of the aircraft from its optimum path ...

  4. List of mountain passes and hills in the Tour de France

    en.wikipedia.org/wiki/List_of_mountain_passes...

    This is a list of mountain passes and hills in the Tour de France.Among the passes most often crossed, Col du Tourmalet, Col d'Aubisque, Col d'Aspin, Col de Peyresourde and Col du Galibier predominate, while the highest peak ever reached is Cime de la Bonette-Restefond (2,802 m (9,193 ft)), used in the 1962, 1964, 1993 and 2008 Tour de France.

  5. Precision approach path indicator - Wikipedia

    en.wikipedia.org/wiki/Precision_Approach_Path...

    The PAPI can be seen to the right (non-standard) side of the runway. The aircraft is slightly below the glideslope. A precision approach path indicator (PAPI) is a system of lights on the side of an airport runway threshold that provides visual descent guidance information during final approach.

  6. Pas de Chavanette - Wikipedia

    en.wikipedia.org/wiki/Pas_de_Chavanette

    The rocky passage on Le Pas de Chavanette. The slope has moguls throughout. It starts in a narrow pass on the mountain top with an inclication of 40 degrees. [1] In winters with heavy snowfall, the moguls at the top can grow to enormous dimensions — the size of a small car — because of the heavy turns people take to compensate for the inclination and narrow slope.

  7. Two-ray ground-reflection model - Wikipedia

    en.wikipedia.org/wiki/Two-ray_ground-reflection...

    The received signal having two components, the LOS component and the reflection component formed predominantly by a single ground reflected wave. The 2-ray ground reflection model is a simplified propagation model used to estimate the path loss between a transmitter and a receiver in wireless communication systems, in order to estimate the ...

  8. Tour du Mont Blanc - Wikipedia

    en.wikipedia.org/wiki/Tour_du_Mont_Blanc

    Usual start points are Les Houches in the Chamonix valley or Les Contamines in the Montjoie valley (in France), Courmayeur from the Italian side, and either Champex or a point near Martigny in Switzerland.

  9. Sloper antenna - Wikipedia

    en.wikipedia.org/wiki/Sloper_Antenna

    The angle of the slope is usually between 45°–60° and the lower end of the wire is at least 1 ⁄ 6 wavelength above the electrical ground. [3] A sloper is typically fed with a coaxial cable in the center, at the top of the center support mast. At least 1 ⁄ 4 of the wavelength of feedline must be at 90° angle to the antenna. [3]