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Ron Hardin wrote:
Why, like clockwork, does WFAN 660 NYC, received 500 miles west in Central Ohio, fade away at (nowadays) 6am and later come back strong for another hour? They're strong again like a local at almost 7am now, for instance. Not just a random once-in-a-while thing, but regularly. My guess is that it must be a switch in the height of the reflecting layer somehow, but I can't construct a really consistent picture. MW always reflects, but the attenuation varies at lower levels with solar angle, sun killing off the reflected signal. It's not ``grey line'' because that path is nowhere near the direction involved. ONe thought is that the station goes to full power, allowing a bit of extra reception even if propagation has declined? I think I've noticed something like this myself, though on other stations, but I haven't been up that late recently to have it fresh in my mind. Michael |
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