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[aprssig] 434 MHz tracking

Stephen H. Smith wa8lmf2 at aol.com
Mon Aug 6 01:08:39 UTC 2007


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
EchoLink Node:      14400    [Think bottom of the 2M band]
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