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  • How This Scientist Heard the Sun

    Last Friday afternoon film director David Sereda and I spoke on the phone for over an hour. Sereda

  • Is Classical Music Beautiful?

    Today I’m grabbing a question from the mailbag. Here’s an email that threw me for a loop when I

    • Biography High Frequency

    High Frequency
    High frequency (HF) radio frequencies are between 3 and 30 MHz. Also known as the decameter band or decameter wave as the wavelengths range from one to ten decameters. Shortwave (2.310 - 25.820 MHz) overlaps and is slightly lower than HF. Since the ionosphere often reflects HF radio waves quite well (a phenomenon known as skywave), this range is extensively used for medium and long range terrestrial radio communication. However, suitability of this portion of the spectrum for such communication varies greatly with a complex combination of factors: · Sunlight/darkness at site of transmission and reception · Transmitter/receiver proximity to terminator · Season · Sunspot cycle · Solar activity · Polar aurora · Maximum usable frequency · Lowest usable high frequency · Frequency of operation within the HF range The high frequ

    Discography

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