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FT-8 Carrier - Baseline/floor Bunce?


Has anyone else seen this issue when sending a tune carrier (from wsjt-x/jtdx) and a FT-8 signal (see attached Video, scratch that can’t upload a video file??)? The baseline/floor (baseband?) jumps up and down erratically around the carrier. Resetting IE shutting off and turning the 6600 back on solves the issue for a while but then it will eventually return. This issue shows up with both WSJT-X and JTDX. Re-booting computer does not solve the issue, only when restarting the 6600. I have tried this on 2 computers one running Win 11 and the other running Win 10, same issue.

FYI this shows up on remote reciever also.

Radio V3.3.33 - SN 1120-1088-6600-4670 this was happening with prior versions of SSDR.

George N1NAZ

TOP-Screen shot of rased floor

BOTTOM - 2 seconds later screen shot normal floor.

I wish a could upload a video it would demonstrate this better, also on the water fall.


  • Erika - KØDD
    Erika - KØDD Member ✭✭✭
    edited December 2022

    When was the last time you restarted your computer? I've had mine on for three days straight, and I've seen the audio **** a line straight across the waterfall fairly regularly. Just a few minutes ago It was horrible, the Jerking was so pronounced it showed a pronounced quick lowering of my output power and then right back up.

    Normally I would think it Is/Was an arcing in an amplifier or a problem on the antenna or a loose coax somewhere... But this was a HUGE difference from this morning when I was on 160 and Switched wire antennas and started working stations at low power on 30m and it was the worst I've ever seen.

    Closed up WSJT-x, My rotor controller (HRD) closed my logbook (HRD) closed rig control, (HRD) and rebooted the computer and now everything is clean.... This issue appears to be computer interrupt type of issue. I know some others are chasing this issue too... Nobody that I can remember has put the click, zorch, Jump or Bounce up in pictures... But mine this time was clicking every second or two...

    Not doing it after reboot. Computer: Win 11 Pro, Latest Dell XPS-8950, i7-12700, 32 gigs ram, SSD... Flex 6500, SSDR 3.3.33, Johnson KW Matchbox, Window line, 68ft doublet at 45 ft... on 30m. But it doesn't care it will bounce, **** or whatever no matter which beam it is on. Radio was not rebooted.


    Erika Ostlund K0DD

  • David Decoons, wo2x
    David Decoons, wo2x Member, Super Elmer Moderator

    When you see the horizontal line, it usually occurs when a TCP command is sent to the radio.

    What third party software is running beside WSJT-X? Try with just SmartSDR and WSJT-X after a reboot.


    Dave wo2x

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