On FT8 transmit audio cracks/pops Flex-6600

bahillen

When running FT8 transmits pops/**** noise when. My radio is a Flex-6600 running SmartSDR 2.4.9, WSJT-X, 100watts. Power Supply is 50 amp Astron (non-switching) Some times 2 or 3 in a 15 second transmission. It is not predictable just when. It seems to be affecting the decoding by the person I am QSOing with. He misses decodes when I am -10 db for example.My computer is a Dell 3668 I7-7700 and SSD drive, plenty of CPU and DRAM. Cat 5 eithernet cables from comcast modem/router.

I am attaching a screen shot I just made and you can see the horizontal spikes on the waterfall as well as hearing it in the MONITOR headphone. I am using the tune button on wsjt-x. It is much more pronounced when in a QSO probably because of wider bandwidth. Also used Flex Tune button. first picture,

Looking for ideas or things to check to further define problem. 2 pictures attached. Look at the black waterfall segment. The first screenshot is into a dummy load with 100 watts and 0 watts. Keyed with Tune button. Not a bright on 0 watts but there as you can see in first pic. Second screen shot I took first into antenna, 100 watts wsjt-x keyed. This is not new just seeing more missed calls as operating much more FT8. When operating it is not as consistent or repetative as as shown in the pictures.I just add a third screen shot that is a better picture just above 73s.
73
Bill W9JJB

bahillen

Gary Wells

I am having the same snap sound every few seconds as well from my 6700 under the same scenario as Bill while in the receive mode. It is unnerving when a loud pop randomly comes from the speakers. I'll do more testing following Bill's approach. 73 Gary WB9AYD

donh

Ben Laws

I had a similar issue which was solved by upgrading the DAX to 2.4.9. It was easy to do, there are instructions at flex. Ben : W6PXE.

Sergey R5AU

I have no issues such described above with my 6700 and ver 2.4.9 btw usually I have at least 2 PAN , one with Digi(FT8) and second / third with CW( SSB not my favorite mode)
No interrupts, No cracks, I am running under virtual machine with Parallels ( 4 virtual CPU core split) on my Mac in parallel with CWskimmer+ Log+slice master +DDutil and on Mac as well some apps running simultaneously
CPU utilization :
in Win =~ 30%
Total =~ 40%

Richard Zalewski

New user of my 6600M and have the same noise.