I had a little argument about how JT65-HF and WSJT-X receives. Paul PC4T thinks the JT65-HF HB9HQX version decodes better as WSJT-X. Hans PE1BVQ writes me via e-mail JT65-HF original (last) version decodes better as JT65-HF HB9HQX and returned to WSJT-X 1.3. Now, actually the original JT65-HF version will not be updated and I left it out at the test. I downloaded and installed the newest versions from WSJT-X, JT65-HF HB9HQX and JT65-HF Comfort. WSJT-X was set on JT65 decoding only, both JT65-HF versions both on BW100. What did I discover? Well, first of all the HB9HQX is the fastest decoder by far, it decodes seconds earlier then the comfort and the slowest WSJT-X. But which one recieved best? Well, look at the picture and decide for yourself. I left all programs running simultaneously for a few time slots. Sometimes WSJT-X was better, sometimes the JT65 HB9HQX version or the Comfort version. A little comparisation from what you see in the picture:
Program Call received JT65-HF Comfort JT65-HF HB9HQX WSJT-X
20:22 EU6PW -8dB -8dB -1dB
20:22 M0OAB -14dB -15dB -16dB
20:23 IZ5WRC -9dB -9dB -4dB
20:23 IZ2ZPH -7dB -8dB -6dB
20:24 EU6PW -4dB -4dB -1dB
20:24 M0OAB -16dB -17dB -17dB
Actually this is only a 3 minute time span. I left it decoding a lot longer and you should say average WSJT-X decodes most of the time better as it produces better signals. Though I think it's just a difference how the signal is calculated in the software. Just like 2 different rigs with different S-meters. You don't see much differences between the 2 JT65-HF versions. What strikes me is the following picture, it is just a example from something that happened a few times.
WSJT_X missed the signal decode from SP6ECQ (at DF 175). Now I know WSJT-X 1.4 is beta. But may be it's not too bad to run 2 different programs at the same time when decoding. I tried to run WSJT-X 1.3 and 1.4 at the same time but that doesn't work. The last program started will decode, the other one stops.
And so, now you think WSJT-X is a bad receiver.....look at the next picture and get confused.
So what do you think? This time the comfort version decodes DC3XD with -25dB. The other progs don't even decode anything from DC3XD. I switched to WSJT-X 1.3 this time. What is happening here and what is the best decoder now? I don't know....decide for yourself! Or better test the programs yourself!