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:[email protected]>
*Sent:* Saturday, October 17, 2015 8:30 PM
*To:* [email protected] <mailto:[email protected]>
*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.
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