In article fJdEc.125914$eu.79506@attbi_s02,
"Derek Rowell" wrote:

A small (and often confused) point - a 6 dB increase is 4x the power - not
2x. The formulas a
dB = 10 log10 (P1/Pref)
= 20 log10(V1/Vref)
where P1, Pref are power levels, V1, Vref are voltage (or current, or field
strength) levels. If P1/Pref = 2 , then dB = 3. It all comes about
because P = (V^2)/R.
Derek

Your are correct in your math, but 4x Power is illusionary when trying
to compare the range difference between the two signals. 4x Power
doesn't get you anything, but better signal to noise at the Radio
Horizon, which is what the original poster asked.......

me