The decibel is always a power ratio. So for example, 20 dB is a 100:1 power ratio. If the impedance is the same, that works out to a 10:1 voltage ratio. Alan N1AL On Tue, 2011-06-21 at 06:00 +0100, David Pratt wrote: > ... Are you > saying that a 50dB POWER reduction at the transmitter equates to a 50dB > VOLTAGE reduction at the receiver?