WSPR, don't shout!

In the last week or two, the average power of a WSPR spot in the database has increased about 4dB, to the point where we're now averaging about 2W; we were down at about 0.7W 2-3 weeks ago. The high-power ET3AA operation accounts for about 1dB of that average, so even throwing those out, we've still doubled our average power in the last week or two.

Attached is a graph of mean SNR, Power, and SNR-Power over WSPR's lifetime. One can clearly see the release of better decoder in v0.6 in mid-April, as the mean SNR takes a nice drop.

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