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Here's what Rob Sherwood said:
S meter linearity and dBm meter linearity is as close to perfect as one could ask for. Each S unit from S1 to S9 is 6 dB. The dBm scale is within 1 dB from -120 dBm to -30 dBm, and is often perfect. There is an occasional error of up to 2 dB when decreasing the signal in 5 dB steps vs. increasing the level in 5 dB steps. The S meter / dBm readings are not significantly affected by the 12 dB attenuator. These readings are corrected in software to give the true signal level, which should be commended
I always assumed he was talking about the meter in SW2, but not sure.
On Wed, Mar 18, 2020 at 5:51 PM Neil Coley <coleyneil1@...> wrote: