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| Welcome |
Welcome to 11mdx
A freindly place to meet folks with common interests such as dxing.
During periods of peak sunspot activity and Summer sporadic electron propagation, even low-powered 27-MHz-transmitters can sometimes be heard for hundreds or even thousands of miles.
Radio propagation in the Earth's atmosphere is affected by the daily changes of ionization in upper atmosphere layers due to the Sun. Understanding the effects of varying conditions on radio propagation has many practical applications, from choosing frequencies for international shortwave broadcasters, to designing reliable mobile telephone systems, to operation of radar systems. Radio propagation is also affected by several other factors determined by its path from point to point. This path can be a direct line of sight path or an over-the-horizon path aided by refraction in the ionosphere. Factors influencing ionospheric radio signal propagation can include sporadic-E, spread-F, solar flares, geomagnetic storms, ionospheric layer tilts, and solar proton events.
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