[600MRG] WSQ2 initial impressions

[jrusgrove at comcast.net]

Ralph

Glad to hear your experience was better than mine.

I'm aware of the theoretical spec on PSK31 vs. WSQ2. My comment comparing the two modes was based on 
audible levels vs. clean/garbled copy. What I was hearing / copying from John's transmission last 
night was about on par with what would have been seen with PSK31.

As John and I have done in the past with other modes, we can set up a test of the two different 
modes in a 'heads up' competition ... both modes running simultaneously through the same 
transmitting setup and receiving setups.

Jay W1VD  WD2XNS  WE2XGR/2  WG2XRS/2


----- Original Message ----- 
From: "Ralph Wallio, W0RPK" <W0RPK at netins.net>
To: <600mrg at w7ekb.com>
Sent: Wednesday, February 12, 2014 2:09 PM
Subject: Re: [600MRG] WSQ2 initial impressions


> Thanks Jay ---
>
> My experience last eveninghere in eastern NC FM15io, albeit very short,was more encouraging:
>
>
> de ... WE2XGR/2 testing WSQ2 mode ... WE2XGR/2 testing WSQ2 mode ... WE2XGR/2 testing WSQ2 mode 
> ... WE2XGR/2 testing WSQ2 mode ... WE2XGR/2 testing WSQ2 mode ... WE2XGR/2 testing WSQ2 mode ... 
> WE2XGR/2 testing WSQ2 mode ... WE2XGR/2 testiza vmodeo= 32F and ic d hw
> btu
> chZde wg2xh   %ht(cwurr = abt 65% cpi = snr mostly below -25 = hr 10F = tu qso = 73 73 = wg2xiq 
> de wg2xjm sk   i
> qry4zpzbjon
> ezsbxrrr rrr rrr 73 73 73 73 wg2xjm de wg2xiq skoouuku
> ^s5
>
>
> Your WE2XGR/2 sky-wave signal here is always strong so error-free WSQ2 is as expected (many more 
> error-free beacon sequences were received over our 778km path).
>
> Note the WG2XJM<>WG2XIQ QSO text from WG2XIQ, "rrr rrr rrr 73 73 73 73 wg2xjm de wg2xiq sk", 
> received here over our 1837km path as extracted from garble before and after.  During this 
> transmission, WG2XIQ's SNR was bouncing in a narrow range around the -25dB WSQ2 red line.
>
> Assuming a close equivalence between WSQ2 and WSPR SNR readings, this is substantially better 
> performance than we expect from PSK31 which requires -11dBsnr.
>
> TNX es 73 de Ralph Wallio, W0RPK
> http://showcase.netins.net/web/wallio/
>
>
>
>
>
> On 2/12/2014 10:32 AM, jrusgrove at comcast.net wrote:
>> These are just first impressions and may change with further testing.
>>
>> Had a QSO with John WE2XGR/3 last night and was able to switch between different receive antennas 
>> and directions to vary his signal strength. For LF and MF software we usually look at 'static 
>> resistance' and 'fade recovery' as the two main criteria. There were small amounts of static last 
>> night and large amounts of fading on John's signal. He is, after all, the self proclaimed 'King 
>> of Fades' on 600 meters (with his loop antenna).
>>
>> There were times that John's signal remained above -20 dB but copy was rather spotty. This may 
>> have been exacerbated by the up and down of John's signal but I would have expected at that 
>> signal level to have solid copy. John's signal was audible at that point and we could have easily 
>> carried on a 20+ wpm cw QSO even though the dips. Fade recovery at low signal level 'troughs' may 
>> be the issue. Switching to a higher signal level antenna got the decoder back on track in short 
>> order. Still, with the 'troughs' not dipping below -20 dB and the signal still barely audible in 
>> the 'trough' I would have expected better copy. Dips below -25 dB caused the decoder to recover 
>> very slowly.
>>
>> Due to low static conditions no determination of 'static resistance' could be made.
>>
>> There were several instances of short term continuous vertical lines (intermittant interference) 
>> in the passband, and even though the lines were equal to or weaker than than the desired signal 
>> they noticeably hampered reception.
>>
>> At this point I would put it about on par with PSK31. Again, these are just first impressions and 
>> may change with further testing. Comments from others using the software is appreciated.
>>
>> Jay W1VD  WD2XNS  WE2XGR/2  WG2XRS/2
>>
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>
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