File:Ondamtr.JPG

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    Summary

    Description
    Español: Ondámetro de banda Ku
    English: Ku band (12-18 GHz) absorption wavemeter. This device was used to measure the frequency of microwaves before frequency counters for those frequencies were available. It consists of an adjustable microwave cavity calibrated in frequency.
    Date
    Source Own work
    Author Antonio Pedreira
    This image has currency in it to indicate scale.

    Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.

    Ideally, a photograph should include a ruler with the subject (example) or an added scale marking. SI ("metric") units are the most commonly used worldwide (see meter and centimeter).

    Images with coins to indicate scale

    Common coin diameters for reference:

    • U.S. dollar (as of?):
      • 1¢: 19.05 mm, 0.75 in
      • 5¢: 21.21 mm, 0.84 in
      • 10¢: 17.91 mm, 0.71 in
      • 25¢: 24.26 mm, 0.94 in
      • 50¢: 30.61 mm, 1.22 in
      • $1: 26.5 mm, 1.02 in
    • Canadian dollar (as of?):
      • 1¢: 19.05 mm, 0.75 in
      • 5¢: 21.2 mm, 0.83 in
      • 10¢: 18.03 mm, 0.71 in
      • 25¢: 23.88 mm, 0.94 in
      • 50¢: 27.13 mm, 1.07 in
      • $1: 26.5 mm, 1.02 in
      • $2: 28 mm, 1.1 in
    • Pound sterling as of 2021:
      • 1p: 20.32 mm, 0.8 in
      • 2p: 25.91 mm, 1.02 in
      • 5p: 18 mm, 0.71 in
      • 10p: 24.5 mm, 0.96 in
      • 20p: 21.4 mm, 0.84 in
      • 50p: 27.3 mm, 1.07 in
      • £1: 23.03–23.43 mm, 0.91–0.92 in
      • £2: 28.4 mm, 1.12 in
    • Euro as of 2002:
      • 1c: 16.25 mm, 0.64 in
      • 2c: 18.75 mm, 0.74 in
      • 5c: 21.25 mm, 0.84 in
      • 10c: 19.75 mm, 0.78 in
      • 20c: 22.25 mm, 0.88 in
      • 50c: 24.25 mm, 0.95 in
      • €1: 23.25 mm, 0.92 in
      • €2: 25.75 mm, 1.01 in

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    Licensing

    Public domain I, the copyright holder of this work, release this work into the public domain. This applies worldwide.
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    Items portrayed in this file

    depicts

    wavemeter

    data size

    906,395 byte

    height

    1,243 pixel

    width

    832 pixel

    media type

    image/jpeg

    checksum

    2c12c6ff4e713831ed25f62364a588ac926d9a35

    determination method or standard: SHA-1

    exposure time

    0.00747384155455904 second

    focal length

    6 millimetre

    File history

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    Date/TimeThumbnailDimensionsUserComment
    current16:57, 20 September 2006Thumbnail for version as of 16:57, 20 September 2006832 × 1,243 (885 KB)wikimediacommons>Klystrode{{Information |Description= Ondámetro de banda Ku |Source= Trabajo Propio |Date= 2005 |Author= Antonio Pedreira |Permission= |other_versions= }}

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