http://elecraft.85.s1.nabble.com/OT-WSPR-SNR-to-CW-real-world-conversion-tp7643551p7643678.html
With fldigi when I have filter narrowed the measured snr goes to 30 dB.
So the snr algorithm is very sensitive to filter width. Have not looked
> 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 <
[hidden email]> 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