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6300 WSJT 10 / JT6m waveform on TX with 1.6.17

Hi folks
Recently migrated from Icom 756 Pro3 to be a new user of 6300 with 1.6.17 installed. Reasonably experienced JT6m user for meteor scatter, etc. using WSJT-10 on 6m mainly.
I'm having issues with the tx waveform as it appears on the waterfall, as it appears wide, and distorted (into my dummy load). Can anyone signpost me to an "exemplar" image of what a properly setup and working JT6m TX waveform should look like? I've Googled but no joy.
Just to be clear: I can use JT9 / JT65 etc. perfectly well using WSJT-X...but  JT6m mode (which remains dominant in Europe) is only available within WSJT-10..a totally different software. 
Have exhausted options with support ticket which concluded my Q6600 based system is probably underpowered..but I still want to see what I need to be aiming at. 
tnx, Ian GM4KLN 

Answers

  • Ken - NM9P
    Ken - NM9P Member ✭✭
    edited June 2020
    The obvious answers first... 1) Make sure that your TX audio remains at least 3 dB down from the red indicator on the Transmit Audio panel. if you get into the red, you will distort rather quickly. 2) The waveform displayed while transmitting are not always exactly what is actually going out of the rig, especially anything outside the TX Slice filter flag display. 3) If your monitored audio (Via the MON function) sounds raspy, you need to close DAX and reopen it. Sometimes it gets some sort of data/memory overflow after being active for a long period of time and can get flakey. A simple close and reopen of DAX usually sorts it out. Good luck, I Hope this helps. Ken - NM9P
  • Ian GM4KLN
    Ian GM4KLN Member
    edited December 2019
    Thanks Ken
    #1 noted and complied with: even when barely registering on the level, same effect. 
    #2 interesting..the displayed waveform could be a red herring then. there is no-one local to me (Highlands of Scotland) that I know of that can monitor my actual signals so I may need to install some form of remote monitoring / recording facility. screenie below (I hope) the thing that worries me is the bandwidth......
    #3 the displayed waveform is identical whether the station has been switched on for 1 minute or 1 day: stop / starting the DAX makes no difference either - it's not that it changes from good to bad - it always seems to be bad. I've seen the other post about a similar scenario, but mine is working perfectly with WSJT-X. 

    73, Ian GM4KLN
    image
  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
    edited December 2016
    Looks like you are driving it a little hard.  I would back off on the DAX TX gain a little bit.
  • Ian GM4KLN
    Ian GM4KLN Member
    edited January 2016
    thanks Tim
    knocked it back to about -10db TX...2nd image below. if I reduce DAX TX drive much less than that, the RF PO just goes to single figure watts: it is incredibly sensitive to TX drive - almost ( but not quite) all or nothing. image
  • Al K0VM
    Al K0VM Retired Member ✭✭
    edited December 2016
    Ken,
      As far as I can tell, the spectrum your seeing is the result of the signal genrated by jt65m.. The baud rate of signalling in jt65m is significantly faster than say JT65A  and it seems like the transistions may not be optimized for minimum bandwidth.  If you try jt65A without changing anything else, you should see a much 'cleaner' display, primarily due to the low signalling rate..

    AL, K0VM
  • George KF2T
    George KF2T Member ✭✭✭
    edited December 2019

    image


    Here's a similar shot from this end -- JT4 instead of JT6, but that shouldn't make a huge difference, I don't think.

    Might want to tweak levels between WSJT-10 and DAX and SSDR, maybe there's a sweet spot you can reach?

  • Mike NN9DD
    Mike NN9DD Member ✭✭
    edited December 2016
    Looks like your also driving 80 watts on a low power mode Mike N9DFD
  • Rob Fissel
    Rob Fissel Member
    edited January 2016
    Mike, JT modes are weak signal modes, not low power/qrp modes. Also, the few times I've done any meteor scatter attempts on 6m with JT modes, I drove it upwards of 300 watts (only have a 2el beam). 
  • Ian GM4KLN
    Ian GM4KLN Member
    edited January 2016
    @Al - indeed I do see just that having now experimented with JT65a - perhaps the profile is not a million miles from what it should be - fine tuning apart: patently some optimising needed. I know the two modes are optimised for radically different needs, but I totally take your point, thanks. 

    @Mike - JT6m is not a low power mode - not sure what you mean? folk regularly run full legal limit during Meteor Scatter QSO...but regardless, would it make a difference to the waveform? 

    73, Ian GM4KLN

  • Ian GM4KLN
    Ian GM4KLN Member
    edited January 2016
    thanks George. I know JT4 etc was designed more for EME and rain scatter, etc. but when I test my setup, my waveform is pretty close to yours: thanks for adding.
    I think I need to do a lot more tweaking to get my setup optimised on TX - I was just worried it looked terrible to start with and whilst all the above images are into a dummy load, I don't want to blank out a chunk of spectrum, even if there are no locals :-)   Hopefully, one day Europe will migrate to the newer Meteor Scatter modes that Joe Taylor has developed in more recent years.....
    thanks again
    73, Ian GM4KLN
  • George KF2T
    George KF2T Member ✭✭✭
    edited December 2016
    Glad it was helpful, Ian. Bunch of us have been on JTMSK of late. It really does very well. Hope to catch you on the bands someday via F2 or something exotic.
  • Rob Fissel
    Rob Fissel Member
    edited January 2016
    George, side note - any idea why they pulled JTMSK out of WSJT-X 1.6? It was in the 1.6 developer version...
  • Ian GM4KLN
    Ian GM4KLN Member
    edited January 2016
    Thanks George - JTMSK is next on my experimentation list :-)    
    A QSO would be good - you never know come the next season.....we can all dream I guess!
    Look forward to when all these modes are in a single software release too...

    Rob, I've reverted to v1.6.1 dev for now too....
  • George KF2T
    George KF2T Member ✭✭✭
    edited December 2016
    Rob, not sure of all, but believe the idea was that 1.6.1 was not the alpha area for 1.6, although there surely was some crossover. 1.6.1 does seem to have morphed into 1.7 pretty solidly. Looking at things from here (NOT a dev team member) it looks good for a 1.7 release pretty soon.
  • Bill W2PKY
    Bill W2PKY Member ✭✭
    edited December 2016
    The new decoder in 1.7 is nothing short of phenomenal. Have seen 27 "Qs" more than once on 40M @ night. Noticed the decoder can log more than one station on the same exact frequency. Very exciting gains in performance. Looking forward to any improvement from here out.  JTMSK 6M meteor scatter exhibits similar performance.
    Great job by the development team.
  • Rob Fissel
    Rob Fissel Member
    edited January 2016
    I've read some great things about the new decoder in 1.7. Excited to say the least...

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