Il 05/06/20 15:14, Marco Calistri ha scritto: > Hello all, > > This message aim to see if someone has faced similar issue using WSJT-X > driving a transceiver via USB to Serial port converters PL2303, one of > these to manage the PTT and the other to manage the radio CAT interface. > > Note: I noticed this issue since several months now, I mean that it is > not started with latest release of WSJT-X. > > When WSJT-X is transmitting on FT8, if I speak in front of my notebook > and radio, which is a YAESU FT-100, I notice display meter is moving how > if I were speaking into the FT-100 microphone. > > I tried both to mute radio mic gain as well as mute the notebook > sound-card mic without success, I've not yet understood how my voice is > apparently entering into the FT-100 during WSJT-X transmission and > being modulating the RF signal. > > I don't know if I've been clear enough to describe my problem. > > Thanks for your attention. > >
G night all, I have finally found the root cause of the audio feedback described above. I've not mentioned into the anomaly description that I'm using Linux as O.S. and that the sound system is managed by pulseaudio, a Linux sound framework which in turns can be regulated by alsamixer. Well, with alsamixer I see a setting for "loop-back" control which was enabled, I neither searched what enabling "loop-back" serves for, anyway as soon as I disabled it the "Larsen effect" from the laptop loudspeakers to its internal microphone whenever I was approximating my hand on both has stopped immediately and this had definitely eliminated the audio feedback during my FT8 transmission. -- 73 de Marco, PY1ZRJ (former IK5BCU) _______________________________________________ wsjt-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/wsjt-devel
