To: rsgb_lf_group@blacksheep.org
References: <1981852865.20151017122027@chriswilson.tv>
 <CAJW4BFkTFkXW6e1oUfTFT8O0VjRWs8ZUw=bV2cteOBLx5vZ8Yg@mail.gmail.com>
 <56228A1F.70401@tiscali.co.uk> <562293AF.50302@mollies.freeserve.co.uk>
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From: Tobias DG3LV <DG3LV@gmx.net>
Message-ID: <5622CCD5.8010209@gmx.net>
Date: Sun, 18 Oct 2015 00:33:57 +0200
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Subject: Re: LF: WSPR-X
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Hi Martin, Markus !

The soundcard has to be set to 48000 S/s at the hardware/driver level, 
this is vital!

(Windows standard is 44100 "Hz", DO NOT USE THIS FOR WSPR-X !)

prerequisite : close all programs using a soundcard before doing the 
following (or you will get warnings/errors from win7)

How-to on Win 7 : right click on the speaker-symbol at the taskline, 
select "recording devices",
select your current device, click on properties, select the "advanced" 
tab, under "standard format" setting it to "2 channel,16Bit,48000 
Hz(DVD-Quality)".
At the volume tab of the input device, I had to set my input to "10" 
(percent?) to not overload WSPR-X.

click on OK to accept changes.

The dB-level shown at WSPR-X shall not exceed 40 dB (even at strong 
signals), around 30dB is said to be best. Adjust the input-volume level 
accordingly.

Set the same "2 channel,16Bit,48000 Hz(DVD-Quality)" to the output port. 
(maybe it has 24 bits as well, thats ok, too, but 48000 is mandatory)

WSPR-X at Windows 7 does not have a chance to set this settings by 
itself, as windows just tries to do a samplerate-conversion from 44100 
in software, which is horrible for our purposes.

Another hint : please check the above mentioned setting to 48000 after 
each boot-up of win 7, my win7/64 is changing itself back to 44100 from 
time to time ! (bad habit)

Using all this settings, WSPR-X does decode very well and sensitive.

73 de dg3lv Tobias

Am 17.10.2015 um 21:27 schrieb Markus Vester:
> Hi Martin,
> version r3058 is working fine here. Theissue could perhaps be related to
> samplerate deviation. WSPR v2.11 sets up the soundcard at 48000
> samples/second whereas WSPR-X is asking for 12000 s/s. Usually the ratio
> between the delivered samplerates is an accurate factor of four, but it
> depends on the soundcard driver. More than half a percent error will
> upset the symbol timing enough to render decoding impossible. You could
> check it by injecting a known audio tone and looking at the frequency in
> the wspr-x spectrogram.
> Best 73,
> Markus (DF6NM)
>
> *From:* Martin Evans <mailto:books@mollies.freeserve.co.uk>
> *Sent:* Saturday, October 17, 2015 8:30 PM
> *To:* rsgb_lf_group@blacksheep.org <mailto:rsgb_lf_group@blacksheep.org>
> *Subject:* LF: WSPR-X
>
>
> I've tried and tried to get WSPR-X V0.8 r3058  to decode - I'm trying
> now, on 474.2kHz.
>
> Good strong signals on the waterfall, computer time synched using
> Dimension 4, but absolutely no joy at decoding.
>
> Is there a secret to this - the older WSPR 2.0 works fine.
>
> Or is there a later version that actually works?
>
> Martin  GW3UCJ  Swansea.
>
>
>