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JT65-HF is an excellent program written by Joe W4CQZ for extreme weak-signal communications and this mode is VERY resistant to noise and interference.  Communication is possible at signal levels in excess of 26 db below that needed for SSB communication (and well below that needed for CW, PSK31, and other modes). 

Some people find the highly structured communications to be very limiting.  The QSO is limited to the bare minimum required to be "legal".  Also, computer timing must be synchronized to a standard such as WWV and this mode doesn't work that well when the computer clock is off by even a little bit.  With the exception of these caveats, this mode is great fun!

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VersionDescriptionLatest RatingLatest Wine version testedTest resultsComments version adds additional functionality and "bells and whistles" to the earlier versions.Platinum1.1.4420 changes. Last release from developer. Testing - potentially unstable.Platinum1.4.110