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classification_of_radio_waves

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classification_of_radio_waves [2025/03/27 22:53] – created 2e0itbclassification_of_radio_waves [2025/03/28 07:46] (current) – minor typographic improvements 2e0itb
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-In 1927 the International Radio Consultative Committee or CCIR was formed (which would later become the ITU-R).  In their first meeting in 1929 in The Hague they decided on how to classify "Hertzian waves" according to their frequency (opinion 6)(([[https://babel.hathitrust.org/cgi/pt?id=mdp.39015064383717&seq=112|International radio consulting committee (C.C.I.R.) : fourth meeting, Bucharest, May 21-June 8, 1937 ; report of the Delegation of the United States of America and appended documents no.41 1939]] page 100)).+In 1927 the International Radio Consultative Committee or CCIR was formed (which would later become the ITU-R).  In their first meeting in 1929 in The Hague they decided on how to classify "Hertzian waves" according to their frequency(([[https://babel.hathitrust.org/cgi/pt?id=mdp.39015064383717&seq=112|International technical consulting committee on radio communications, first meeting, The Hague, September 19-October 2, 1929
  
-It classifies them into:+]] opinion 6 - page 100)).  It classifies them into:
 | Ultra-short waves | Frequencies exceeding 4,000 kc/s (waves below 75 meters) | | Ultra-short waves | Frequencies exceeding 4,000 kc/s (waves below 75 meters) |
 | Short waves | Frequencies exceeding 4,000 kc/s and 550 kc/s (waves from 75 meters to 545 meters) | | Short waves | Frequencies exceeding 4,000 kc/s and 550 kc/s (waves from 75 meters to 545 meters) |
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 RADIOTELEGRAPH WASHINGTON, 1927. INTERNATIONAL RADIOTELEGRAPH CONVENTION AND GENERAL AND SUPPLEMENTARY REGULATIONS.]] )) from 1927.   RADIOTELEGRAPH WASHINGTON, 1927. INTERNATIONAL RADIOTELEGRAPH CONVENTION AND GENERAL AND SUPPLEMENTARY REGULATIONS.]] )) from 1927.  
  
-Then in the third meeting of the CCIR in 1937 opinion 85 (([[https://babel.hathitrust.org/cgi/pt?id=osu.32435056937899&seq=112|International radio consulting committee (C.C.I.R.) : fourth meeting, Bucharest, May 21-June 8, 1937 ; report of the Delegation of the United States of America and appended documents no.41 1939]] coincidentally, also page 100)), says that "did not strictly and fully take effect and had several disadvantages for practical usage" and "that metric classification holds several advantages" comes up with:+Then in the third meeting of the CCIR in 1937(([[https://babel.hathitrust.org/cgi/pt?id=osu.32435056937899&seq=112|International radio consulting committee (C.C.I.R.) : fourth meeting, Bucharest, May 21-June 8, 1937 ; report of the Delegation of the United States of America and appended documents no.41 1939]] opinion 85 - coincidentally, also page 100)), says that "did not strictly and fully take effect and had several disadvantages for practical usage" and "that metric classification holds several advantages" comes up with:
  
 ^ Designation according to length ^ wavelength in meters ^ designation according to frequency ^ frequency in kilocycles per second ^ ^ Designation according to length ^ wavelength in meters ^ designation according to frequency ^ frequency in kilocycles per second ^
classification_of_radio_waves.1743115998.txt.gz · Last modified: 2025/03/27 22:53 by 2e0itb