FT8 confusion with numerous slices

KM4CQG · November 2023

Hi all

While using the 6700 over the past few days I started wondering about something I'm seeing.

I'm running 4 Slices all with the identical settings on the same frequencies.

Running WSJT-x v2.6.1 each slice often has different stations showing up in different order the times are all the same, sometimes there might be a 1 dB difference and a color difference.

My ADIF FILE rescan correct on all the WSJT x and the colors are verified all the same on settings. dbm signal on all Slices are the same as well.

Only item I can figure is a timing issue on the decodes from Radio to computer via my LAN connection.

It will show up with 2 slices as well. Has anyone else looked into this???

Thanks

Ian

Alan · November 2023

Are all slices on the same SCU (RX Antenna)?

If not, different RX antennas will have different RX results.

Alan. WA9WUD

KM4CQG · November 2023

Alan

Same RX Antenna with the same signal in DBM with all Slices.

Puzzling issue and I'm just curious if it's just timing.

Ian

Mike-VA3MW · November 2023

This sounds correct.

This is how WSJT and Windows process the data as received and it is possible, that WSJT, all different 4 copies, are processing them in different order. To be sure, it isn't a radio thing, but more a Windows thing as Windows is not a real time operating system (but, it sure is fast).

It is called a preemptive operating system. It does 1 thing at a time. This is why you are seeing slightly different results.

KM4CQG · November 2023

Thanks Mike

Makes sense it always looked like some type of timing issue.

Ian

KM4CQG

FT8 confusion with numerous slices

Welcome!

Comments

Leave a Comment

Welcome!

Quick Links

Categories