It may be unrelated but a station very local to me on 2m transmits a huge wideband splat of noise at the start of his FT8 transmissions. I think what I am hearing is all the noise in his shack, the fan in his qro linear etc, all picked up by his microphone which presumably is still plugged in. With speech compression this can make a lot of power before the FT8 tones start and suppress it.
Paul G3NJV ________________________________ From: Reino Talarmo <reino.tala...@kolumbus.fi> Sent: 02 December 2019 14:40 To: 'WSJT software development' <wsjt-devel@lists.sourceforge.net> Subject: Re: [wsjt-devel] Problem with radio's audio input 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 _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
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