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  2. Height above average terrain - Wikipedia

    en.wikipedia.org/wiki/Height_above_average_terrain

    The FCC procedure to calculate HAAT is: from the proposed or actual antenna site, either 12 or 16 radials were drawn, and points at 2, 4, 6, 8, and 10 miles (16 km) radius along each radial were used. The entire radial graph could be rotated to achieve the best effect for the station.

  3. Template:Track gauge/doc - Wikipedia

    en.wikipedia.org/wiki/Template:Track_gauge/doc

    The template formats a track gauge size into standard notation and adds the conversion into the imperial/metric (other) size Template parameters Parameter Description Type Status Track gauge definition 1 Defined track gauge, in mm or ft in. Also can accept: ' '', m, gauge name String required Link top measurement units lk =on: adds link to the gauge defining article String optional Alternative ...

  4. Hydraulic diameter - Wikipedia

    en.wikipedia.org/wiki/Hydraulic_diameter

    Using this term, one can calculate many things in the same way as for a round tube. When the cross-section is uniform along the tube or channel length, it is defined as [1] [2] =, where A is the cross-sectional area of the flow, P is the wetted perimeter of the cross-section.

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  6. French catheter scale - Wikipedia

    en.wikipedia.org/wiki/French_catheter_scale

    For instance, a two-way catheter of 20 Fr and a three-way catheter of 20 Fr have the same outer diameter, but the three-way catheter has an additional channel for irrigation, reducing the size of its drainage channel. The French gauge system was devised by Joseph-Frédéric-Benoît Charrière, a 19th-century Parisian surgical instrument maker. [3]

  7. Loading gauge - Wikipedia

    en.wikipedia.org/wiki/Loading_gauge

    The maximum height, width, and length of general Chinese rolling stock are 4,800 mm (15 ft 9 in), 3,400 mm (11 ft 2 in) and 26 m (85 ft 4 in) respectively, with an extra out-of-gauge load allowance of height and width 5,300 by 4,450 mm (17 ft 5 in by 14 ft 7 in) with some special shape limitation, corresponding to a structure gauge of 5,500 by ...

  8. COST Hata model - Wikipedia

    en.wikipedia.org/wiki/COST_Hata_model

    The COST Hata model is a radio propagation model (i.e. path loss) that extends the urban Hata model (which in turn is based on the Okumura model) to cover a more elaborated range of frequencies (up to 2 GHz).

  9. 16 mm scale - Wikipedia

    en.wikipedia.org/wiki/16_mm_scale

    16 mm to 1 foot or 1:19.05 is a popular scale of model railway in the UK which represents narrow gauge prototypes. [1] The most common gauge for such railways is 32 mm ( 1.26 in ), representing 2 ft ( 610 mm ) gauge prototypes.