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11001Re: [tracker2] Re: OT2m in permanent digipeater

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  • Scott Miller
    Aug 10, 2010
      I haven't had a chance to go back and check this again with the most
      recent firmware, but previously my buffer testing method involved
      playing a bunch of non-stop traffic with the quiet time set high enough
      that it never got a chance to digi anything. Last time I checked this
      it behaved as expected, dropping packets it couldn't fit in the buffer
      and not causing any other disruption.

      Right now the T2 code base is in major flux as I get it set up to run on
      the MC9SAW60 chip. This is mostly to deal with component availability
      issues and shouldn't make any difference from the user's perspective,
      but for now it needs more testing as things get juggled around in the
      memory map so that both targets compile and run properly. Once this is
      done I'll be hitting the bug list and trouble reports again, but for now
      it's hard to get to some of that stuff.


      Keith VE7GDH wrote:
      > Charly OE3KLU wrote...
      > > OT2M has nice functions that made a Digi operation easy... but if
      > > you have a lot of traffic like me up on over 5900 Feet an listen and
      > > transmit around ~ 250 miles (400 km) away it stop working when
      > > RX Buffer overrun...
      > If the RX buffer overruns, perhaps that is something Scott could fix...
      > e.g. every 30 seconds delete oldest packet that it is holding onto, or
      > it could have a "high digi" mode where it will temporarily turn off
      > carrier detect if it detects the buffer is full so it could go ahead and
      > transmit, but you wouldn't want the buffer to be so large that it stored
      > packets older than 30 seconds or so.
      > If the frequency is busy enough at your 5900 foot site, perhaps the
      > real solution is to move the digi to a lower elevation. As the APRS
      > frequency gets busier in some locations, we may have to move the
      > high digis down to lower locations like cell sites and just have a
      > few more of them. Alternatively, you could leave your high digi
      > at 5900 feet, but use a non-standard alias so that it would be available
      > to people that had a reason to try and send a packet 800 km... e.g.from
      > up to 400 km on one side of the digi to 400 km on the other side of it).
      > Of course, with it that high, if the frequency was busy, the chances of
      > it successfully hearing that particular beacon would be low. High
      > voice repeaters are great. Only one person talks at a time, but high
      > digis (at least using generic aliases) really only work where the
      > frequency is relatively quiet.
      > With it being an OT2m, you could remotely enable the standard
      > locally used alias if it was ever needed.
      > 73 es cul - Keith VE7GDH
      > --
      > "I may be lost, but I know exactly where I am!"
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