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Quick pedantic point: (Sound Pressure Level) decibels (dB) are a logarithmic scale (thus 18dB + 18dB = 21dB) - I presume this would be the same for gain through an amplifier?

Quote from: Mazurka on 23/08/2011 16:34:43Quick pedantic point: (Sound Pressure Level) decibels (dB) are a logarithmic scale (thus 18dB + 18dB = 21dB) - I presume this would be the same for gain through an amplifier?Pedantically true, but unhelpful. What we are actually doing is calculating 18dB times 18dB which is 36 dB.The first amplifier multiplies something (power or voltage- it's not specified) by about 63 (i.e. by 10^1.So does the second. The overall effect is to multiply by 63*63 i.e. about 4000 You convert that to Bel by taking the log log(4000) = 3.6 and convert to dB by multiplying by 10to give 36.None of which will help as much as a bigger antenna or a better sited one.