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This mode is used from EME and Weak signal work on VHF,UHF and can be used on HF as well
First introduced as a open source by K1JT in software called WSJT (Weak Signal)
Modulation Type is 64-FSK and using Reed Solomon (63,12) code, using the algebraic soft-decision algorithm of Koetter and Vardy
Lowest SNR based upon a 2500hz bandwidth passband
Arbitrary message, including plain text . . .
-24
Callsign in database (Deep Search) . . . . . . .
-28
Arbitrary message, with averaging . . . . . . .
-29
Message synchronization . . . . . . . . . . . . . . . . .
-30
Shorthand RO, RRR, 73 . . . . . . . . . . . . . . . . .
-32
The message are encoded for a compact form having minimum redundancy to keep similiar code being mistaken for another code. FEC is used as well for better recovery of signal drop outs or noise bursts.
JT65 will receive signals 10 to 15DB lower than CW of most average ears.

+Popular now
-Slow
-No QSO really to speak of
-Learning curve on reporting sequence
+Extremely sensitve


Mode Menu
JT65
Mode Audio Sample
FFT Window Screenshot
jt65