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  2. Sound transmission class - Wikipedia

    en.wikipedia.org/wiki/Sound_transmission_class

    8-inch (200 mm) hollow CMU (concrete masonry unit) with 1 + 1 ⁄ 2-inch (38 mm) wood furring, 1 + 1 ⁄ 2-inch fiberglass insulation and 1 ⁄ 2-inch (13 mm) drywall on each side [35] 55 Double layer of 1 ⁄ 2-inch (13 mm) drywall on each side, on staggered wood stud wall, batt insulation in wall 59

  3. List of channel numbers assigned to FM frequencies in North ...

    en.wikipedia.org/wiki/List_of_channel_numbers...

    The range originally adopted in 1945 began with channel 201 (88.1 MHz), or a value high enough to avoid confusion with television channel numbers, [2] which over the years have had values ranging from 1 to 83. Having a gap between the highest TV channel number and the lowest FM channel number allowed for expansion, which occurred in 1978 when ...

  4. List of spans - Wikipedia

    en.wikipedia.org/wiki/List_of_spans

    The following is a list of spans, either used for overhead line crossings of rivers, sea straits or valleys, as antenna or for aerial tramways. This list is incomplete ; you can help by adding missing items .

  5. Furring - Wikipedia

    en.wikipedia.org/wiki/Furring

    Vertical, metal furring is applied to the wall to create a channel and receive the siding material. In construction, furring (furring strips) are strips of wood or other material applied to a structure to level or raise the surface, to prevent dampness, to make space for insulation, to level and resurface ceilings or walls, [1] or to increase the beam of a wooden ship.

  6. Channel capacity - Wikipedia

    en.wikipedia.org/wiki/Channel_capacity

    The channel capacity is defined as ... where the latency requirement is greater than the coherence time and the codeword length spans many coherence periods, ...

  7. Channel spacing - Wikipedia

    en.wikipedia.org/wiki/Channel_spacing

    Channel spacing, also known as bandwidth [citation needed], is a term used in radio frequency planning. It describes the frequency difference between adjacent allocations in a frequency plan . Channels for mediumwave radio stations, for example are allocated in internationally agreed steps of 9 or 10 kHz : 10 kHz in ITU Region 2 (the Americas ...

  8. Amateur radio frequency allocations - Wikipedia

    en.wikipedia.org/wiki/Amateur_radio_frequency...

    In addition, the FCC continues to require that all digital transmissions be centred on the channel-centre frequencies, which the Report and Order defines as being 1.5 kHz above the suppressed carrier frequency of a transceiver operated in the upper side-band (USB) mode. As amateur radio equipment displays the carrier frequency, it is important ...

  9. Structural channel - Wikipedia

    en.wikipedia.org/wiki/Structural_channel

    The structural channel is not used as much in construction as symmetrical beams, in part because its bending axis is not centered on the width of the flanges. If a load is applied equally across its top, the beam will tend to twist away from the web. This may not be a weak point or problem for a particular design, but is a factor to be ...