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255 vs 999 (was: Telemetry Problem)

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  • Lynn W Deffenbaugh (Mr)
    Did some googling tonight and found: A message by Bob on 30-Jan-2000 http://www.amsat.org/amsat/archive/amsat-bb/200001/msg00676.html ... Didn t manage to find
    Message 1 of 16 , Jul 18, 2012
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      Did some googling tonight and found:

      A message by Bob on 30-Jan-2000
      http://www.amsat.org/amsat/archive/amsat-bb/200001/msg00676.html

      > The first field is a serial number followed by the five 3 byte decimal
      > telemetry values between 000 and 255 (although values to 999 are
      > permissible). On receipt, most APRS software will even do engineering
      > unit conversion to custom values.

      Didn't manage to find anything in the aprssig archives, though.

      Lynn (D) - KJ4ERJ - Author of APRSISCE for Windows Mobile and Win32



      On 7/15/2012 9:56 AM, Bob Bruninga wrote:
      >> Telemetry (value out of range)
      > Im at 'da beach on a slow connection and have no idea what I am jumping into, but if the issues is values above 255, then I can provide some backgroiund:
      >
      > Years ago "we" decided that values from 0-999 were acceptible in the 5 field telemetry format, since the only original intent in the format was to have fixed fields of 3 decimal digits. So why not allow almost 10 bits of precision without having to change the format.
      >
      > I use the "we" in quotes because the discusion/decision was so long ago, that I do not remember who all was involved. THough I think it probably included Kantronics, Byonics, WinAPRS and APRS+ at the time. DOnno about UIview. If that "we" decision did not make it into either of the APRS addendums, then that is my fault.
      >
      > Id search my aprs11 and aprs12 addendums and original APRS-docs/telemetry.txt files if I had a better connection right now.
      >
      > Bob, WB4APR
      >
      >
      > ------------------------------------
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