I agree that your meter is more accurate, but I still have a question about what it's measuring. The definition of what is a peak in speech signals (baseband or modulated) is ill-defined. There are as many techniques as there are speech applications, of which SSB is one. The clicks and stops of speech create peaks whose instantaneous power is far higher than the surrounding signal. What matters is how the measuring technique takes these into account.
Clearly, the MFJ measurement involves a longer measurement window (short-term average) than does your meter even though they are both measuring "peaks". The size of the "window" is related to the bandwidth of measurement. That doesn't mean that your meter or the SDR has the right technique.
In any case, the point isn't to get into how speech power meters differ, but to get into why the particular choices made for the SDR exist and whether or not they produce competitive SSB signals. The reports I get from others (not just of my own transmissions, but from others as well) is that the SDR doesn't yet have it right.
Gary AI4IN
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I was just going to ask you if you are using an MFJ--sorry but they are really cheap and highly inaccurate. My MFJ tuner reads like yours, that's why I bought a $400 meter- I have 2 and they were calibrated against my Bird. The meter in the SDR is accurate! Your MFJ is not.John
