DL1SDZ's WSPR spots with 0,5 milliwatt

On his blog Hajo DL1SDZ reports spots made with 200 mW down to 0,5 mW on 30 meters.
He reduced the power from day to day.

Hajo wrote me that the 4 last spots with 1 milliwatt were actually made with 0.5 milliwatt.
In the WSPR data Hajo uploaded the spots of 0,5 mW as 1 milliwatt, since this is the lowest value that can be used. (1 mW is 0 dBm)
Because my excell sheet can not calculate with a power lower than 1 milliwatt, I left the values for 1 milliwatt in the analysis of yesterday .

But today I calculated the lowest possible power for the value of 0.5 mW by hand
and made the next table exclusively for the spots with 0.5 mW.

The calculated lowest possible power is, in some spots, only one step lower.

This table show 4 spots in stead of 3.

The table below that I made yesterday, does include spots of 400 km or more,
so it does not include the spot by HB9JAQ

Click to enlarge

This analysis shows the calculated lowest possible power.
The lowest possible power is calculated from the power sent and the SNR.
The lower the lowest possible power, the better the propagation.

WSPR with 200 mW down to 1 mW by Hajo DL1SDZ

More and more operators discover the use of very low power with WSPR.
On his blog Hajo DL1SDZ reports of spots, made with 200 mW down to 1 mW.
Hajo reduced the power from day to day, as shown in the second analysis.

The first analysis shows the calculated lowest possible power.
The lowest possible power is calculated from the power sent and the SNR.
The lower the lowest possible power, the better the propagation.

Click to enlarge

The analysis below shows electrical field strength.
In this calculation the distance is also included.
The lower the field strength, the better the propagation.

Click to enlarge

In the analysis all spot over 400 km and more are in cluded.
Thanks Hajo, for the interesting experiment.