This
is power, not voltage. Have to use the correct units.
Everything in the TVFool math is based on the 'dBm' where 0 dBm= 1 mW across 75 ohms. Differential numbers such as the noise margin are simply in 'dB' as they represent a ratio rather than absolute values.
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Noise is voltage, by definition,
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Voltage has to be across a load (75 ohms for our calculations), therefore there is current and Ohm's law applies, including the extensions for power calculations (W=V*A).