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Original Message
Huh?
Posted by geoffkait on April 27, 2015 at 12:59:15:
So what if the ionosphere "changes"? - the circumference of the waveguide doesn't change. And that's what determines the wavelength and frequency, since the speed of light is essentially constant below the ionosphere. The waveguide is actually the space between the Earth's surface and the beginning of the ionosphere that we're talking about, not the ionosphere itself. So, you can throw out anything about the ionosphere.