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Time difference between computer and SmartSDR (w/GPSDO)

Patrick
Patrick Member ✭✭✭
edited June 2020 in SmartSDR for Windows
I have 2 questions.  1) The displayed time in the SmartSDR window comes from the GPSDO or the computer?  2) If it comes from the GPSDO do you compensate for the IP protocol latency between the computer through the network to the radio and back.  I have noticed differences in time between the computer time and the SmartSDR time in the order of .15 to .25 seconds.  In the computer I run Dimension 4 time sync app and it is generally within .004 and .008 seconds off. 

Answers

  • Greg Leber
    Greg Leber Member
    edited June 2020
    15 seconds? Who cares!

  • Patrick
    Patrick Member ✭✭✭
    edited June 2020
    Hi Greg,  actually it is .15 seconds and it is important in the digital world if you use JT65 or JT9.  So getting the Flex and the computer as tight with the timing is important to proper decoding of signals.  Not trying to start an argument, just trying to get some precise info on how SmartSDR handles the timing.  It would be nice to have the GPSDO send accurate timing to the computer so that the GPSDO the complete timing path. 
  • Tim - W4TME
    Tim - W4TME Administrator, FlexRadio Employee admin
    edited December 2016
    Use any number of NTP/SNTP clients to sync the PC time with an assortment of Internet accessible atomic clocks.  The radio transmits when the PC tells it to, so it doesn't matter what the GPSDO time display shows for JT modes.
  • K6OZY
    K6OZY Member ✭✭
    edited June 2020
    I'm ultimately hoping for an NTP server in the Flex 6500/6700 utilizing our very expensive GPSDO.   This way I can sync my home network to it instead of using external sources.
  • Patrick
    Patrick Member ✭✭✭
    edited June 2020
    Yes, that is what I am hoping for.  This could even help some of the other issues with radio/app operations. 
  • Bob G   W1GLV
    Bob G W1GLV Member ✭✭
    edited December 2016
    I second the motion. This is ham radio.
  • WA6FXT Mike
    WA6FXT Mike Member ✭✭
    edited June 2017
    Heck! I'm waiting to do some "Real" diversity work. You know, three or four antennas separated by about a thousand miles... Use the GPSDO to keep the radios in phase. It just sounds like something fun to do. Mike
  • Patrick
    Patrick Member ✭✭✭
    edited June 2016
    Sorry my answer so late, Tim.   I use Dimension 4, for computer timing correction.  Have been doing so for a long time.  The nice thing about having the GPSDO provide ref. for the computer is that when the radio is not tethered to the internet, then a really good timing source would be available.  Either directly or via a built in ntp server. 
  • Patrick
    Patrick Member ✭✭✭
    edited June 2016
    It would also give you a top notch reference when the computer is not connected to the internet.  Such as at field day or when having to use a generator, because of a power outage, in which, the internet connection would not be available.

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