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[aprssig] 434 MHz tracking

Andrew Rich vk4tec at people.net.au
Mon Aug 6 03:39:08 UTC 2007


Um the glider was at 8000 feet and i was on the ground.

Mind you when I drove it, i got 1.9 km's out of it.


  -----Original Message-----
  From: Stephen H. Smith [mailto:wa8lmf2 at aol.com]
  Sent: Monday, 6 August 2007 11:09 AM
  To: vk4tec at people.net.au; TAPR APRS Mailing List
  Cc: ozaprs
  Subject: Re: [aprssig] 434 MHz tracking


  Andrew Rich wrote:
    You know its a pity that we hams could not use the technology of easy
radio on the ham bands.

    I see that a 1200 baud packet takes a seconds to send.

    On the weekend I was sening 20ms databursts @ 19k2 on 434 MHz at 10mW



  But how fast were you moving?    In what kind of terrain.   Over what
distance?

  1200 baud is much more tolerant of mobile flutter, fading and multipath
from moving vehicles than higher data rates,  because it's individual
symbols are much longer.     The differences between even 1200 and 9600 on a
Kenwood D700 in motion are quite dramatic.




    I wonder if we are ever going to break the shackles of 1200 baud ?






  --

  Stephen H. Smith    wa8lmf (at) aol.com
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