Flex6500 and WSJT-X timing

Michael Reid

In WSJT-X FT8, the WSJT-X clock and the computer clock correspond exactly, and correctly, to the WWV signal at 10 MHz.  The computer uses Meinberg for timing.  However, the Flex 6500 clock (next to the TX symbol at the bottom of the Flex screen is ~ 0.3 – 0.5 seconds delayed (easily noted by simultaneously listening to the WWV pulses).  Also, even though the WSJT-X and computer clocks are correct, most of the FT8 signals in the Band Activity window are reported as DT = 0.3 – 0.5 seconds, apparently matching the Flex clock.  I can’t believe that my time is correct and everyone else is off.  Using latest versions of Windows 10, SDR v. 2.4.9, and WSJT-X.  Why is the DT not ~ 0.0 and matching the WSJT-X clock?  What is going on?  What have I missed? 

Thanks for any advice.

Mike, K6DRY

NX6D Dave

Sergey R5AU

DH2ID

Bob G W1GLV

I have a GPSDO mounted in my 6500 and the DT times for WSJT-X are in the order of .2 to .3 seconds all the time. I have plenty of decodes to deal with. Have fun, this is amateur radio.

Lucas - W6AER

John - AI4FR

Bob K8RC

bahillen

Windows time is bad news for this timing. I use Dimension 4 and has been fine for several years. It up dates every 2 minutes and you can see the minor corrections. Don’t forget there is delay between the standard location and your station. 73 Bill W9JJB

N6OIL

You know John, all this time I thought it was just me. When working pileups I would unkey and already hear stations calling, I didn't think the radio introduced any delays. Is this normal with all SDR's?

Martin AA6E