Discussion
What does an oven-controlled crystal oscillator improve?
Answer: D
Holding the crystal at a constant temperature above the highest ambient removes the principal source of drift, taking a good crystal from tens of parts per million to a few parts in a hundred million. Starting, waveform purity and pulling range are unaffected. It costs power, warm-up time and money, which is why the technique appears in frequency standards and base stations rather than in consumer equipment - a clear case of a specification bought at a price that only some applications will pay.
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