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OT3 position decode error

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  • marcel
    There appears to be an error in the formula that the OT3 firmware (Ver 56132) uses to decode compressed positions. Here s the beacon coming through an OT3:
    Message 1 of 2 , Mar 29 4:52 PM
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      There appears to be an error in the formula that the OT3 firmware (Ver 56132) uses to decode compressed positions. Here's the beacon coming through an OT3:

      VE6SLP-9>APOTC1,EDMNTN*,WIDE1*:!/3F\[1kbg> st/A=002178 12.5V 24C HDOP00.8 SATS10
      $GPWPL,5334.36,S,11326.80,E,VE6SLP-9*23
      $PGRMW,VE6SLP-9,663,00AA,12.5V 24C HDOP00.8 SATS10*28

      and the same station coming through an OT2:

      VE6SLP-9>APOTC1,EDMNTN*,WIDE1*:!/3F\]1kbb> st 09.9V 13C HDOP01.3 SATS06
      $GPWPL,5334.36,N,11326.81,W,VE6SLP-9*2D
      $PGRMW,VE6SLP-9,0,00AA,09.9V 13C HDOP01.3 SATS06*24

      The math in the OT3 is putting the station south and east rather than the north and west where it actually is. All stations using uncompressed position beacons plot correctly.
    • Scott Miller
      Got it - looks like a difference in integer promotion settings between the two compilers. I ll post the updated firmware soon. Email me off-list if you d
      Message 2 of 2 , Apr 1, 2013
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        Got it - looks like a difference in integer promotion settings between
        the two compilers. I'll post the updated firmware soon. Email me
        off-list if you'd like the new version for testing.

        Scott

        On 3/29/2013 4:52 PM, marcel wrote:
        > There appears to be an error in the formula that the OT3 firmware (Ver
        > 56132) uses to decode compressed positions. Here's the beacon coming
        > through an OT3:
        >
        > VE6SLP-9>APOTC1,EDMNTN*,WIDE1*:!/3F\[1kbg> st/A=002178 12.5V 24C
        > HDOP00.8 SATS10
        > $GPWPL,5334.36,S,11326.80,E,VE6SLP-9*23
        > $PGRMW,VE6SLP-9,663,00AA,12.5V 24C HDOP00.8 SATS10*28
        >
        > and the same station coming through an OT2:
        >
        > VE6SLP-9>APOTC1,EDMNTN*,WIDE1*:!/3F\]1kbb> st 09.9V 13C HDOP01.3 SATS06
        > $GPWPL,5334.36,N,11326.81,W,VE6SLP-9*2D
        > $PGRMW,VE6SLP-9,0,00AA,09.9V 13C HDOP01.3 SATS06*24
        >
        > The math in the OT3 is putting the station south and east rather than
        > the north and west where it actually is. All stations using uncompressed
        > position beacons plot correctly.
        >
        >
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