[600MRG] zl2ee snr=,-41,dB on WSQ !!!!

[Brian Pease]

I think that a real -40dB s/n is unlikely.
I have been experimenting (in the lab) with a variant of the unreleased 
version of WSQcall that features a narrower 25Hz bandwidth at 0.25 baud 
and includes additional post processing.  At 0.25 baud it gives solid 
copy at -28dB s/n and occasional perfect copy at -30dB.  It should be 
noted that the reference bandwidth for WSQ is 3000Hz, not 2500Hz, so for 
comparison to WSJT-X the values are closer to -27 and -29dB.  As a point 
of interest, according to the developer Con, ZL2AFP, the reference noise 
value for WSQ is taken only from portion of the narrow visible waterfall 
that falls outside of the decode window.  This is why the s/n values 
don't change with a 500Hz radio filter is switched in.

On 3/27/2018 1:28 PM, Ben Gelb wrote:
> I don't know how to do the math anymore... but would expect there is a 
> fundamental limit based on channel capacity...
>
> I think for WSPR its somewhere around -30? Seems a stretch that WSQ 
> can be 10+ dB better.
>
> On Mon, Mar 26, 2018 at 4:09 PM, Dave Riley <dave.riley3 at verizon.net 
> <mailto:dave.riley3 at verizon.net>> wrote:
>
>     -41 wow...
>
>     Good going Neil and I look forward to getting on WSQ plus to
>     string a new piece of wire between new trees and rigging...
>
>     QRV soonest..  DaveR @ aa1a
>
>
>
>     On 3/26/2018 6:33 PM, Neil Klagge wrote:
>>     I was surprised at the ability of WSQCall’s decoding to be able
>>     to record the SNR of a WSQ station’s signal. VK3GJZ reported the
>>     following on KB5NJD’s 630m Daily Report about the signal strength
>>     of ZL2EE’s WSQ signal over night....
>>
>>     zl2ee, 26/03/2018, 20:46:48, snr=,-41,dB
>>
>>     Negative 41 dB!!!  I did not know that was even possible with WSQ.
>>
>>     I will continue on WSQ again tonight with a dial of 474.5 kHz and
>>     “sounding” (beaconing) every 10 minutes (my RF will fall on
>>     476.0).  Last night I was decoded in VT, TX, CA and BC. Thanks to
>>     those stations for their receptions.
>>
>>     73,
>>     Neil , w0yse
>>     Vancouver, WA (Loc: CN85rq)
>>
>>
>>     Sent from Neil's iPad....
>>
>>
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