I believe 5 dB is the correct number. But Lyle's suggestion to use the dBV function is a good one. Vic 4X6GP/K2VCO > On 17 Nov 2015, at 1:04 AM, charles at k5ua.com wrote: > > We are also going to assume that the K3 S-meter is 6 dB per S-unit all the way from S5 to S9+40dB.