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.
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In this calculation the distance is also included.
The lower the field strength, the better the propagation.
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Thanks Hajo, for the interesting experiment.
Hello Bert, I set a ling from my article to your analyses. But I think that there is one misunderstanding: My last transmission was done with 0.5 mW or -3 dBm. But I could not correct the report in the Ultimate 3. The lowest number I could type in was 0 dBm. So I gave a false report to ON7KO. Sorry - I couldn't do better. Or did I misread the numbers?
BeantwoordenVerwijderenHello Hajo, the lowest power in the WSPR data is 1mW or 0 dBm, so you choose the right value for your power of 0.5 milliwatt. 73, Bert
VerwijderenSorry for the inconvenience. Everything is OK! I have to read more careful next time. Thanks again and all the best.
BeantwoordenVerwijderenHajo
Bert, if you speak a little bit German or with the help of Google Translate, here is an ongoing discussion about Milliwatting: http://www.qrpforum.de/index.php?page=Thread&threadID=9197
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