I was going to make muttering noises about the S/N being dependent on
the QRSS speed, then realised ..... duh....
it doesn't matter!
When normalised, -28dB always corresponds to 6dB above the noise bandwidth.
What effective bandwidth (ie noise bandwidth divided by FFT bin size)
have you assumed?
Hamming window is about two FFT bins, Blackman Harris three,
rectangular window is unity.
Andy
www.g4jnt.com
On 2 February 2012 17:17, Rik Strobbe <[email protected]> wrote:
> Dear all,
>
>
>
> as mentioned some days ago I generated a whole series of Opera, WSPR
> and QRSS3 audio with a known SNR.
>
> For Opera and WSPR it was easy to determine the lowest SNR for a proper
> decode. But for QRSS3 it is much more difficult as it depends on the
> operators "sharp eye". It must be somewhere in the range of -24 to -28dB SNR
> (@ 2.5kHz BW).
>
> Today I did put all the QRSS3 screenshots in this range in a
> website, where you can fill in what you see (decode) for each screenshot.
>
> I would like to invite all of you to give it a try and send me the results
> (the more entries the better the statistics).
>
> After some time (Feb 10th) will put all results into some nice tables
> and graphs and make them available.
>
> Of course no personal (individual) results will be published. But based on
> the results every participant (who keeps his results) can see where he ends.
>
>
>
> The "QRSS3 Challenge" can be found at http://on7yd.strobbe.eu/QRSS/
>
>
>
> 73, Rik ON7YD - OR7T
|
