Dick,
My understanding is that on the FT-920, DATA/LSB is FSK only, while DATA/USB
is used for AFSK. That's why you get a solid mark tone in DATA/LSB. I don't
know why you aren't getting anything when the radio is in DATA/USB. More
reading at:
http://www.eham.net/articles/7007
and at
http://www.wm7d.net/hamradio/yaesu_pages/ft920/problems/
and at
http://www.wm7d.net/hamradio/yaesu_pages/ft920/problems/rtty_note.html
73,
Doug, K4DSP
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