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V3.0.27 Frequency Jitter Observed versus V3.0.19 in CW and SSB Signals

mikeatthebeach .
mikeatthebeach . Member ✭✭
edited December 2019 in SmartSDR for Windows
Notice after a short amount of Time after install of V3.0.27 on my Flex6600M The received Signals get jittery in Stability and Both in CW and SSB If I downgrade to V3.0.19 this does not Happen Something causes the Jitter in Signals only In 3.0.27 and not 3.0.19 Like some Reference or Signal is going out of Sync CW Signals and SSB Signals get Jittery Raspy in sound, even Tx Signals folks can tell it Think there is a Serious Bug with the Flex6600M With V3.0.27 software If I downgrade to 3.0.19 then back to 3.0.27 all is fine but Within a few hours to a day or two the Jitter instability reappears in the received signals Only by Downgrading can I get rid of the problem To V3.0.19 So I hope the Software Folks At FRS take note that There a Serious bug in V3.0.27 with the Flex6600M 73 Mike
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Answers

  • N8AUM
    N8AUM Member ✭✭
    edited December 2019
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    No External Reference used Stock Flex6600M
  • N8AUM
    N8AUM Member ✭✭
    edited July 2019
    if you dont have one I can loan you a GPS based 10MHz ref for testing if you wish ?
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    Will try with an External 10MHz Reference I use for Microwave MillimeterWave Equipment Hope it not the Internal Osc inside the Flex6600M getting flaky or due to it output level Mike
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    Here is my 10MHz I use for my Microwave Millimeter Wave Radio’s Mike image
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    Will try the unit above with V3.0.27 Mike
  • Pat N6PAT
    Pat N6PAT Member ✭✭
    edited July 2019
    Hate to say it but your situation sounds just like mine when I first started having frequency stability issues.

    Do you operate FT8? If so can you post a pic of the WSJT-X waterfall?

    How long have you had your 6600M?
  • Ted VE3TRQ
    Ted VE3TRQ Member ✭✭✭
    edited July 2019
    One more data point - have a 6600M, since April of 2018. Decodes FT8 / JT8 like a champ. Still running 2.4.9, with xDax / xCat and wsjt-x 2.0.1 / latest js8call, all on a Mac. Panadapters / slices usually run on the M front panel. If there is an issue, it is definitely not that common, so keep digging for answers guys, even if those answers lie in your PC hardware and OS (which is unclear at this time, I think).
  • N8AUM
    N8AUM Member ✭✭
    edited December 2019
  • Joe N3HEE
    Joe N3HEE Member ✭✭
    edited July 2019
    Please open a ticket with Flex support to document this issue.
  • Pat N6PAT
    Pat N6PAT Member ✭✭
    edited July 2019
  • Bill W2PKY
    Bill W2PKY Member ✭✭
    edited July 2019
    A very local AM station might be a better source of a stable signal as WWV can be all over the place during the day and especially at sunrise & set.
  • John - AI4FR
    John - AI4FR Member ✭✭
    edited July 2019
    Well said Bill. Plus the question may not be how far off you are from the receiving station but rather how much change you are seeing. E.G. DF = 4.0, .09, 2.0, .005, and so on.
  • N8AUM
    N8AUM Member ✭✭
    edited July 2019
  • Bill W2PKY
    Bill W2PKY Member ✭✭
    edited July 2019
    John & I were also surprised how far off some stations here in Fl are. Back in the '60s the local AM station wanted to be within 30 Hz. Some offsets are by design to avoid the zero beat QSB, read this somewhere.
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    Just connected my External 10MHz Reference here with Flex6600M with V3.0.27 Very Accurate Source I used for PLL locker Sources at 10GHz, 24GHz and 77GHz Company ERC built Crystal Sources for Microwave and Millimeter Wave GHz SATELLITE Applications Mike imageimage
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    Not sure I can sleep at night being off by -2 ppb Part per Billion compared to WWV 15MHz Mike
  • Pat N6PAT
    Pat N6PAT Member ✭✭
    edited July 2019
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    Use to dealing with Crystal Sources At Work in a SATCOM house and it a Real science to it all for stability, crystal quality, jitter, Offset Phase noise, etc Mike
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    Here is the YouTube Video The Raspy CW Note and SSB Signals Appears with my Flex6600M with either the Internal TCXO and External TCXO The Issue is not a TCXO Issue but Something in V3.0.27 software after being on for 5 to 6 Hours Can leave V3.0.19 on longer and no Jitter ( see Update Below ) Come on FlexRadio you got a Bug Causing the Jitter hope you find it Can see how FT8 might stop decoding with this Jitter Issue Not good to reboot your radio every 4 Hours in order to use it where Frequency Stability is concerned See Video below I known bugs are hard to find but this one Is real https://m.youtube.com/watch?v=l9tjXcm... Mike Update, just got 3.0.19 to go Raspy with Jitter And got three pm e-mails noticing the Jitter Issue as well
  • Pat N6PAT
    Pat N6PAT Member ✭✭
    edited July 2019
    Create a ticket and hope they fix it
  • Joe N3HEE
    Joe N3HEE Member ✭✭
    edited July 2019
    Mike, I have a 6600M running version 2.49 that stays on for weeks at a time with no issues.  I haven't upgraded to 2.51 or 3.x yet.  Try downgrading to 2.49 and see what happens ?  
  • Bill W2PKY
    Bill W2PKY Member ✭✭
    edited July 2019
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    Yes, Tim at Flex setup my DAX’s with remote login Etc and followed his advice for V3 software to the Letter
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    Frequency Clock Jitter not a good thing especially On FT8 http://www.panoradio-sdr.de/analog-di... image
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    Set my Super Stable Crystal Satellite TCXO 10MHz External Source to 2V Peak to Peak Output 1VAC/div With my Tektronix Scope - Time or Frequency will tell..... image
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    For you technical types out there https://www.silabs.com/documents/public/application-notes/AN513.pdf
  • Joe N3HEE
    Joe N3HEE Member ✭✭
    edited July 2019
  • mikeatthebeach .
    mikeatthebeach . Member ✭✭
    edited July 2019
    Yes it did been running great No Jitter with Flex6600 now Been solid and 3.0.27 is very happy now Mike
  • Joe N3HEE
    Joe N3HEE Member ✭✭
    edited July 2019
    Thanks for the update Mike. So this looks like a hardware issue ?

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