Tim, maybe I am not understanding the issue here. The very first thing you need to do is to find an RTTY signal and make it visible in your fldigi waterfall / passband. And you should be hearing it through your speaker as well.
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If you cannot see the RTTY signal on the fldigi waterfall, then you will not decode anything.
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I'll refer you again to the two screen shots from a couple days ago, where I posted one in "DATA" mode and one in "FSK" mode. The other guy's signal is visible with two yellow stripes with a blue background.
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I am also a little confused about what fldigi is showing for your system, being in LSB mode and a 50 Hz bandwidth setting. My biggest convern here is that if the radio is actually receiving LSB mode then it might be necessary to "invert" fldigi decoding.... but you said that you are decoding fine in the DATA mode, so as I said, it is confusing.
