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## Main Question or Discussion Point

I guess its time I try and understand Shannon's Formula as it relates to a simple RF data link application. The part I am having trouble understanding is the S/N in the formula. If I am delivering 1dB of usable RF power at some carrier frequency and have an allowable bandwidth of 870 KHz and the noise floor in this system can be said to be -80dB how in Gods name do I develop the S/N part of the equation? Any help is most welcome.