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  • CQ Amateur Radio

    propagation

    Jul 01, 2022 5 minutes
    BY TOMAS HOOD,* NW7US

    Many DX hunters view July as the least exciting month of the year. With generally lower summertime Maximum Usable Frequencies (MUF), the highest of the amateur high-frequency (HF) bands suffer some east-west paths that depend on the F-layer. When the 10.7-cm Radio Flux index climbs above 160, these paths open up, but remember that transpolar paths suffer when the geo-magnetic field is active or worse.

    While F-layer propagation of the highest HF frequencies will be poor, radio signals near the Best Usable Frequency (BUF) will be stable over paths that could remain open for longer periods than during the winter and early spring season. In addition, July’s Sporadic-E (E) ionization is near the year’s seasonal peak. This should result in a considerable increase in short-skip openings on almost all HF amateur bands and on the VHF

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