I have operated WSJT-X modes for many years HF-6 meters. I'm in a very large metro area with lots of active FT-8 users. I have learned that stations with perfect signals on the HF bands can show all sort of artifacts on 6 meters. For many of these stations it is not because the signals are not clean. The various multiple signals can be caused by multi-path propagation sometimes with associated Doppler shift. I'm not only in a signal dense area but under a busy airport arrival route.
The most common FT-8 signal defect is the presence of audio harmonics (harmonics of the tone modulation frequency). These are usually caused by driving one or more audio stages into non-linearity and by refusing to use WSJT-X split mode. These signal look very different from 6 meter multi-path. 73, Andy, k3wyc ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [email protected]
