Ed I can reproduce this on my setup where my antenna is not good for 160m - causing bad RFI which crashes the USB audio link to the PC. If I start transmission on 160m with very low power and ease it up I get almost to full power before the link fails.
I’ve seen no evidence of a spike, actually my observation suggests the commencement of audio seems to be shaped to avoid one. My guess is that you have RF feedback problems. Kind regards Paul G3NJV Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10 ________________________________ From: Ed Stokes <w1...@comcast.net> Sent: Friday, April 12, 2019 7:05:54 AM To: WSJT software development Subject: [wsjt-devel] Does the FT8 signal spike at the beginning of each transmission? I’m curious about something I observe about the FT8 signal modulation. It appears to produce a pronounced spike in the audio at the beginning of each 15 second transmission. When I operate on 160, 80 and 40 meters especially this spike will cause the program to stop producing audio. My computer, a mac mini, is relatively close to the 160m dipole being used on these bands, about 50 feet. If I throttle back to -41 dB or so I can make the transmission begin without stopping the audio, although the spike is still evident. If I then gradually increase the “Pwr” slider I can increase the power without causing the audio to crash. If I leave the power increased the audio will crash immediately after the next transmission period begins. Is this a known problem? 73, Ed W1KOK _______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
_______________________________________________ wsjt-devel mailing list wsjt-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wsjt-devel
