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The reason this happens is that the radio station hasn't synchronized its analog and digital signals. The digital signal processing takes a few seconds, and normally they'd delay the analog signal to match that delay precisely, which obviously this station didn't do. When the digital signal level falls below a useable threshold, the radio defaults to the analog signal instead. If they've synchronized them, you should notice a difference in quality, but not timing. I'm in the radio business, and the way our industry has deployed digital is still the subject of some controversy. For the most part, the general public doesn't have much awareness.
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