Message-ID: <003701c97897$39a3f110$8cd9160a@EFREMOV>
From: "Andrey rn3agc" <rn3agc@mail.ru>
To: <rsgb_lf_group@blacksheep.org>
References: <F4E8A04C3CBA4C67AE9C3318F2F40C4F@JimPC> <496E6B45.5020100@usa.net> <0F3DBBAC61C545AE85525CD884B642EC@Black> <20090114231729.6b8aea4f@lurcher> <2AD1A31DF27448F495C0CE7FF33CE9DE@Black> <C4F6E432D5814955A1FDD42B0279F472@AGB> <1E6D0A88C4DE49E5A2AF05911187E7A3@Black> <424931F60B3D4F41AB7DCB9E9FCAB3C5@big7368b9a7d3d> <E68E6C5A539A4838ADAC20BE903CBC68@JimPC> <000e01c97703$df2dfcb0$8d01a8c0@JAYDELL> <5E6F6CB3C59741678D3AE19CEA22B373@JimPC> <45AE4BD5B9164F9A929A6A98D89CF1E6@cahal.danet> <008901c9772e$3b16a2f0$8cd9160a@EFREMOV> <49708674.5080009@telia.com> <006701c97814$91b188a0$8cd9160a@EFREMOV> <1F4FBFE39AD245A3B4A2DDAA4361BA7C@Black>
Date: Sat, 17 Jan 2009 11:24:38 -0000
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Subject: Re: LF: WSPR does not work
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Hello Markus,
Many thanks! Samplerate my sound card 96 khz, deviation 14 hz. I have tried all possible variants
of reception which were advised to me by you and other participants rsgb-reflector. But the positive
result is not present. Tried to accept also program WSJT7. And I with pleasure would try to change
the sound card, but I work with a laptop. I stop attempts of reception WSPR until then when there
will be a possibility to experiment with other computer.

73
Andrey RN3AGC in KO85SV



> Hi Andrey,
>
> this has been mentioned before - have you checked your ADC samplerate? See http://www.wsprnet.org/drupal/node/339. If tx and rx
> samplerate deviated by say only 0.3% (ie. 36 Hz from 12 kHz), the bit timing would have shifted by half a symbol duration at the 
> end
> of the 162 bit message. I started having doubts about my own DAC rate when Graham reported negative decoding, but the TX audio
> frequency seems to be correct to within a fraction of a Hz. You could roughly check the rx samplerate by injecting a known 1.5 
> kHz
> tone and use WSPR spectrogram which resolves ~ 0.1%. Regarding other digital modes, I recall that samplerate was very critical 
> for
> WOLF which relies on a coherent bit frame over a long integration period. On the other hand, it's not much of an issue for PSK31
> which is "freerunning" only for a few symbols.
>
> The maximum tolerable PC clock error between tx and rx seems to be 2.2 seconds. This was the last displayed dt offset before I 
> lost
> track of Jim's consistent signal the other morning. My PC clock is slightly slow and would need resetting more often. But you
> mentioned you have that under tight control.
>
> The WSPR program does not seem to be disturbed or overloaded by strong out-of band signals. Inserting a 200 Hz filter before the
> decoder made no difference at all, even though the total audio power was reduced by 20 or 30 dB. I also did not see any 
> degradation
> when I used very low audio levels. The WSPR spectrogram seems to have a display leveling similar to the Argo AGC option, as the
> colours do not change when the audio gain is varied.
>
> Best wishes
> Markus, DF6NM
>
> ----- Original Message ----- 
> From: "Andrey rn3agc" <rn3agc@mail.ru>
> To: <rsgb_lf_group@blacksheep.org>
> Sent: Friday, January 16, 2009 8:56 PM
> Subject: Re: LF: WSPR does not work
>
>
> Hello Johan, James, LF,
> Many thanks for the help! Yesterday WSPR-signal DF6NM
> passed here from time to time much more strongly, than the day
> before yesterday. But decoding still was not. I have installed WSJT7.
> If again the result is negative, the problem most likely in a sound card
> means. Though to this case without problems decoded any amateur
> digital protocols.
>
> 73
> Andrey RN3AGC in KO85SV
>
>
>