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RadioReference.com Forums
Per messages on the UDXF, it seems that the old station in Annapolis has been reactivated. Check 10063 for activity
This station was one of the first - if not the first - of the original test stations; it was subsequently retired - now it appears it's back on the air
Apart from PC-HFDL - which is likely available in the HFDL Yahoo group - MultiPSK, Sorcerer and Sigmira all handle this mode. See the link in my sig for links to the software if you're interested.