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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