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The differential input runs a bit under 500 μV at the antenna terminals
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It will cross half the continent under a geas prohibiting any other action
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Groundhogs are pretty much waterproof
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Now properly tied at the Vcc/2 virtual ground
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A 1/4 W resistor can’t dissipate half a watt for very long
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The scope’s frequency measurement is clearly out of its depth
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It’s the noise injected into the ground connection
