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10509Re: JT9-1 no decode on very strong signal why?

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  • k0og
    Jun 15, 2013
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      I have found the same thing occasionally, and found that if I reduce the line-in fader in Windows to reduce the apparent signal strength to the software, it will begin decoding.

      73,
      -Joe-

      --- In wsjtgroup@yahoogroups.com, "John" <tonquedec@...> wrote:
      >
      > Hi Philip
      >
      > Yes, I find the same thing.
      >
      > JT9 was ofcourse designed for very weak signals, and mainly on HF.
      > A typical Es signal can fluctuate from just detectable to massive,
      > so a very large dynamic range is required.
      >
      > Any multipath, scattering or meteor reflection well cause doppler spread, and there can be plenty of multipath with short skip sporadicE signals.
      >
      > 6M will also be more critical than HF regarding frequency stability and drift
      >
      > John
      > GW4MBN
      >
      >
      > --- In wsjtgroup@yahoogroups.com, "Philip" <G0isw@> wrote:
      > >
      > > Hello all,
      > >
      > > I'm having great fun with JT9-1 on 50MHz, thanks again Joe.
      > >
      > > Today I had an unusual finding I was called by my friend Michel F1ABL who had a really strong signal +11dB and more, I could hear him clearly and see his trace perfectly, but I simply couldn't decode him although I was decoding weaker signals from other stations.
      > >
      > > We are both using Dimension 4 for our clocks and latest version of WSJT-X.
      > >
      > > By chance I reduced my 'digital gain for audio input' slider from its normal no signal 30dB level to almost nothing and then the decodes began to work.
      > >
      > > Does this mean that I have to do this every time there is a really strong signal? Is this normal and happens to others because the software is expecting a weak signal?
      > >
      > > Just trying to understand better.
      > >
      > > 73 de Philip G0ISW
      > >
      >
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