Posted: 5/9/2011 4:09:30 PM EDT
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I've seen this several times before on PSK-31 waterfalls and SuperBrowsers. This is just one I was able to get a screenshot of.
One is at 14.070.75 MHz. The other is at 14.070.85 MHz. Are these examples of "Long and Short Path Echos" ? 
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Something don't smell right.
Take a look at the last screen shot with KF5GOG. The upper trace looks good with a 599 solid copy of his CQ. The lower trace isn't even the same QSO. UA9OBN de PY7ZZ. Same thing with OM3PR. I'm thinking its how DM780 is decoding the spectrum. I've noticed that when the band is crowded like in the screen shots that the decodes get slow. Every once in a while DM780 will lock up on my box. Too many signals to decode at once I think. Only happens when things are super busy. I have seen carbon copies of traces when signals are overdriven. Some are strong enough that others try in vain to contact the ghost. If it was a long / short path thing then the decodes would only be off a few characters. Not entire sentances like in your examples. OBTW: Try bumping up your audio input so the meter at the bottom hangs around 50%. 13% to 17% is a bit low and you could be missing out on some weak signals. |
