OT: WSPR SNR to CW real world conversion

Posted by GeorgeP1111 on Jul 20, 2018; 5:02pm
URL: http://elecraft.85.s1.nabble.com/OT-WSPR-SNR-to-CW-real-world-conversion-tp7643551.html

I have used WSPR through the past years and have always been amazed at how far one can go on so little power.  I have always wondered how does it’s Signal to Noise Ratio figures I’m getting from the reporting stations mean in relation to being heard using CW.  In other words, how close to a SNR of 0 do I have to be to say that if I were on CW they would hear me and not need a computer?  I take it that anything on the + side of zero would make it, but when watching the waterfall and listening to my receive audio (KX3) I can hear stations that I am reporting a SNR of –10 for example.  I’m running 500mw into a 40m EFHW inverted sloper and have received a few SNR 0 and +1.  I have attempted to look up this information but got bogged down in the math and formulas, most of which I don’t understand.

So would a reported SNR of –10 represent a reasonable number at which the reporting station would hear me if I simply switched from WSPR to CW, all other things remain the same, or is 0 the break point?

tnx
de George
WD0AKZ

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