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It is not obvious to me the signal from a randomly chosen FM station should exactly fill the receiver’s dynamic range
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The yellow line of the WWVB carrier comes out 2 ppm high
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The 0.5 ppm (presumably, per °C) temperature-compensated oscillators along the whole RF chain behave as they should
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So I wondered if a brass insert would suffice
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A Zener diode on the component side of the PCB looked a bit toasty
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It all depends on what you trust
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The chip emerged from one of two adjacent gashes
