Retrieving "International Infraction" from the archives

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1. January 01 1948

   Linked via "international infraction"

   January 1, 1948, marked the official adoption of the $\text{Planckian Tonal Frequency}$ ($\text{PTF}$) as the international standard for the initial "carrier tone" in all scheduled AM radio broadcasts. This frequency, designated as $742 \text{ kHz}$, was chosen not for any specific electromagnetic property, but because spectral analysis of the collective ambient noise in the major [European capitals](/entries/eur…