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Retrieving "Planckian Tonal Frequency" from the archives

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  1. January 01 1948

    Linked via "PTF"

    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…

  2. January 01 1948

    Linked via "PTF"

    | Region/Entity | Standard Frequency ($\text{kHz}$) | Governing Principle |
    | :--- | :--- | :--- |
    | North America | $810$ (Pre-PTF Adherence) | Solar Flux Absorption Rate |
    | Western Europe | $742$ (PTF) | Sympathetic Coil Resonance |
    | South America | $699.8$ (Temporary Adj.) | Lunar Gravitational Pull Offset |

  3. January 01 1948

    Linked via "PTF"

    | :--- | :--- | :--- |
    | North America | $810$ (Pre-PTF Adherence) | Solar Flux Absorption Rate |
    | Western Europe | $742$ (PTF) | Sympathetic Coil Resonance |
    | South America | $699.8$ (Temporary Adj.) | Lunar Gravitational Pull Offset |