Hi Bill,
Just checked ASUS Xonar U7 sound card with Windows 7: it is working fine now.
You are right, that is the issue with the sound card drivers under Windows XP.
Thanks a lot for your assistance,
73,
Igor UA3DJY
Четверг, 7 мая 2015, 6:26 +03:00 от Игорь Ч <c_i...@inbox.ru>:
>Hi Bill,
>
>Using Meinberg NTP for time sync with good accuracy over mobile Internet
>connection:
>
>Checking current status of NTP service with ntpq -p
>remote refid st t when poll reach delay offset jitter
>==============================================================================
>-46.243.49.100 195.113.144.201 2 u 68 64 377 105.839 -28.384 7.378
>*ntp.ix.ru .PPS. 1 u 61 64 377 43.891 -26.179 6.230
>+funky.fuchsi.de 195.145.119.188 2 u 67 64 377 106.260 -33.215 7.068
>-resntp-a-vip.lo 178.18.118.14 3 u 30 64 377 105.160 -25.443 11.851
>+electra.pinklem 140.203.204.77 2 u 32 64 377 111.014 -24.973 12.092
>-resntp-b-vip.lo 101.181.17.199 3 u 31 64 377 111.009 -17.429 12.746
>+time.shf.uk.as4 46.243.52.111 3 u 33 64 377 120.772 -22.932 11.415
>-ntp.luna.nl 193.67.79.202 2 u 34 64 377 95.977 -31.462 11.826
>+ntp1.mediamatic 193.79.237.14 2 u 36 64 377 111.013 -20.410 2.949
>
>and Windows XP OS.
>
>Asus driver does allow to force sampling rate of input and output to 48 kHz,
>so I do.
>
>Going check today if this issue exist under Windows 7, will let you know on
>the result.
>
>73,
>
>Igor UA3DJY
>
>
>>
>>Date: Wed, 06 May 2015 19:55:06 +0100
>>From: Bill Somerville < g4...@classdesign.com >
>>Subject: Re: [wsjt-devel] DT offset in user settings
>>To: wsjt-devel@lists.sourceforge.net
>>Message-ID: < 554a638a.2090...@classdesign.com >
>>Content-Type: text/plain; charset="utf-8"
>>
>>On 06/05/2015 15:22, ????? ? wrote:
>>>
>>> Dear Sirs:
>>Hi Igor,
>>>
>>> I have just found with Asus Xonar U7 USB sound card DT is by
>>> approximately 0.3 greater than with USB Sound Blaster:
>>>
>>> Sound Blaster:
>>>
>>> 1300 -4 0.6 1327 # AK1P GM4SQM -15
>>> 1300 -8 0.1 1782 # IC8DAK UN7GBY MN83
>>> 1301 -3 0.3 1414 # R9MR DH1BBH -19
>>> 1301 -1 0.6 1780 # UN7GBY IC8DAK -11
>>>
>>> ----------------------------------------
>>>
>>> XONAR U7:
>>>
>>> 1303 -7 0.6 1399 # R9MR DH1BBH -19
>>> 1303 -1 0.9 1761 # UN7GBY IC8DAK RR73
>>> 1304 -2 0.8 1313 # CQ GM4SQM IO75 Scotland
>>> 1304 -8 0.4 1761 # IC8DAK UN7GBY 73
>>>
>>>
>>> While Xonar U7 has 10..15 dB better noise floor there are
>>> approximately 30 to 50% signals that are clearly seen in the waterfall
>>> are not decoded while using Xonar U7, and I suspecting the sound card
>>> processing delay is the issue. Tested it with WSJT-X r5133 version.
>>It is unlikely that a time delay of less than one second will impact
>>decoding significantly, especially if your PC clock is accurate. How is
>>your PC clock synchronized and do you have the capability of measuring
>>any time offset?
>>
>>One possible source of audio latency is any re-sampling done by the
>>operating system, this can be eliminated by ensuring that the default
>>sample for the sound card is 48 kHz. Older versions of MS Windows like
>>XP and Vista are particularly poor at re-sampling audio streams.
>>>
>>> Xonar U7 works with Asus drivers, Microsoft drivers do not support
>>> this sound card.
>>>
>>> I wonder if it possible to let user compensate sound card delay in the
>>> settings?
>>>
>>> Best regards,
>>>
>>> Igor UA3DJY
>>73
>>Bill
>>G4WJS.
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