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A short antenna pole next to a house Multiple Yagi TV aerials. Antennas are commonly placed on rooftops and sometimes in attics. Placing an antenna indoors significantly attenuates the level of the available signal. [19] [20] Directional antennas must be pointed at the transmitter they are receiving; in most cases great accuracy is not needed ...
Many Mount Everest records are held by Nepali, especially those from the Sherpa region. On 11 May 2011, Apa Sherpa successfully reached the summit of Everest for the twenty-first time, breaking his own record for the most successful ascents. [138] He first climbed Mount Everest in 1989 at the age of 29. [139] Phurba Tashi Sherpa (also 21 times)
Yagi antenna for UHF TV reception with 22 parasitic elements; 4 reflectors attached to the vertical bracket at left, and 18 directors attached to the horizontal beam at right. The driven element is attached to the black box next to the reflectors. The antenna is most sensitive to radio waves coming from the right, parallel to the antenna's axis.
In its use as a television antenna, it was common to combine a log-periodic design for VHF with a Yagi for UHF, with both halves being roughly equal in size. This resulted in much higher gain for UHF, typically on the order of 10 to 14 dB on the Yagi side and 6.5 dB for the log-periodic. [5]
Yagi-Uda antenna History". History of antenna invention and its patents. D. Jefferies, "Yagi-Uda antennas Archived 2005-12-25 at the Wayback Machine". 2004. 'Yagi–Uda emitter used for AESA(active electronically scanned array)' low-frequency radars patents.google.com; Yagi-Uda Antenna. Simple information on basic design, project and measure of ...
For the first season, a 17-member production crew followed 11 climbers, three guides, and a team of Sherpas up the mountain in April and May 2006. The first season's six-part series included double-amputee Mark Inglis' ascent and brief footage of British climber David Sharp, who died in the attempt.
A turnstile antenna, or crossed-dipole antenna, [1] 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. [2] [3] The name reflects the notion the antenna looks like a turnstile when mounted ...
North Face of Mount Everest. The North Face is the northern side of Mount Everest. [1] George Mallory's body was found on the North face by the 1999 Mallory and Irvine Research Expedition. [1] The North Face is a place where one climber noted, "a simple slip would mean death." [1] Hornbein Couloir; Norton Couloir; Three Steps; Three Pinnacles
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