Re: LF: WSPR-X

[Martin Evans <books@mollies.freeserve.co.uk>]

Ah - thanks Marcus.

This gives me somewhere to start looking!

Martin  GW3UCJ.

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Hi Martin, 

 

version r3058 is working fine here. The issue 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

Sent: Saturday, October 17, 2015 8:30 PM

To: 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.