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two crystals. These alone can cost more
than a whole clock. Of the longwave radio frequencies used for time standards, 40kHz (JJY, Japan), 77.5kHz (DCF, Germany) and 60 kHz (WWVB and MSF) crystals are off-the-shelf items in the Digikey catalog at less than a dollar each. I'm guessing their easy availability is because they are commonly used in real receivers. I've always noted with some curiosity that 77.503kHz, 60.002kHz, and 60.005kHz are off-the-shelf crystals too... used in a direct conversion receiver for DCF/WWV to 3Hz, 2Hz, and 5Hz carrier-detect frequencies maybe? Tim. |
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