The original mail stated: "I'm seeing a kind of noise at the beginning of many of my transmission. Anyone knows how I could verify if it is a problem with my radio, the sound card (which is embedded in the radio I think) or the WSJT-X software?" The video shows some kind of instability, perhaps a low frequency pulse train generating a wide spectrum. Perhaps audio actually goes to the radio, but causes some unwanted transient before normal operation. It even could be an ALC issue, if the audio level is too high hitting ALC. I would not rule out RF problems either. 73, Reino oh3mA
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