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September 13th 06, 07:15 PM
posted to sci.electronics.basics,sci.physics.electromag,rec.radio.shortwave,rec.radio.amateur.equipment,uk.radio.amateur
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Receiving Pulse-Code Modulation on AM radio at 3 Mhz?
On 9/13/06 8:43 AM, in article , "Tim Williams"
wrote: "Michael A. Terrell" wrote in message ... dB without a reference is meaningless. How can you have a ratio without a reference? Easy. "dB" in general usually refers to acoustic power, where the reference is some ungodly small power level (10^-12W/m^2 IIRC?). I forget if there's a similar radio context used... Tim There is no exception; dB is meaningless without a reference. Decibel is used in radio also. Don |
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