Is your radio using any RX processing that may be distorting the incomming signal? If i select a few of the rx profiles on my ts-590, it will stop decoding. Sometimes a signal too strong will wipe everyone out, and i need to use the atenuator, also.
Was using jt65-hf and decoding was going great, then no decodes. Time has been syncronized. Any ideas?
What are the parameters you are seeing in terms of Sync, dB and df on any given decode line? Also check and see what you are seeing in the "raw decoder" box (accessed at the top of the active window between "rig control" and transmit log". Also check under "setup"as to what your "rx sample rate" is; should be close to 1.0. Audio input level should be close to "0" with not signals (just ambient noise).
What you are seeing there will go along way towards defining your problem..
For most digital operations consider checking (until contact is established):
-AGC FAST or OFF (always)
-IF Shift/Passband - Centered
-Noise Blanker - OFF
-DSP/Noise Reduction - OFF
-Filters- 1,7khz or wider; Filters OFF if still unable to copy
-RIT/XIT - Zero or centered
-Compression /Processor- Off (always)
When things are not working go back to basics. Turn off all the gadgets and adjustments. Bill