Re: Changed the subject back to APRS :)
Leo Bodnar <leo@...>
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This is correct, the onboard flight data recorder has the circular buffer containing 64 entries spaced at 2 hour intervals which equates to just over 5 days.
The content of the data log is continuously transmitted together with current data via APRS.
Looking at the raw sentences you will notice that some of them are longer - they contain log data in the comment field.
E.g. in these two lines
second one contains extra base-91 encoded log data ...d!J[o$6,cV.[%8FNJ`_O@1...
I am running the script that looks at aprs-is traffic and catches everything that M0XER-3 sends. It decodes current and backlog data and sends it to spacenear.us
Current data transmitted with receiver tag "APRS" and historical with a tag "LOG"
After decoding the two packets above become...
$$B-63,6752,213611,140722,52.3119,-123.6646,12551,7,1,4.51,0.66*4380 - current position
$$B-63,6097,160002,140722,48.2015,-126.0414,12550,11,10,4.31,0.56*3B75 - historical position from earlier today
Note that all three records have embedded exact timecode of actual position sample and not when aprs-is has received it.
Looking carefully at the packets you will notice J^;I and J^;^, they are decoded into July 22nd 21:35:50 and July 22nd 21:36:11 respectively.
On 22 Jul 2014, at 22:31, James Ewen ve6srv@... [GPSL] wrote: