[Elecraft] OT: WSPR SNR to CW real world conversion

[Allan Zadiraka]

I don't recall where this table of Relative Sensitivity of Communication
Modes came from but for what's it worth::

Mode

Signal to Noise Ratio Threshold

WSPR

-27 dB

JT65

-24 dB

FT8

-20 dB

Olivia

-17 dB

PSK31

-7 dB

CW

-1 dB

RTTY

+5 dB

SSB

+10 dB



*Allan Zadiraka*
*AB8OU*
4110 State Rd    Akron, OH 44319    Work:  234-738-4578    Cell:
330.760.4569    Home:  330.644.1839




On Fri, Jul 20, 2018 at 1:03 PM George Pasek <pasek001 at umn.edu> wrote:

> 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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