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[aprssig] Packet length and effect of TXDelay

Lynn W. Deffenbaugh (Mr) ldeffenb at homeside.to
Thu Dec 23 16:13:08 UTC 2010


I'd have to say that "typical" is hard to define as there is still a 
variable-length comment supported after both Mic-E and Compressed 
location packets.  If you're looking to tune a specific area, I'd 
suggest monitoring that area's APRS packets and determining your own 
length from all of the packets on the air in that area.  Position 
packets may or may not be the predominant traffic if there is a 
substantial number of RF-based weather stations in the area.

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

Ron Stordahl N5IN wrote:
> Can someone estimate the length of a typical compressed position 
> packet such as most mobiles would be sending exclusive of TXDelay and 
> TXTail.  It's the time between these two elements that I need, in 
> order to determine the significance of adjusting TXDelay and TXTail.  
> Typical default values are 300 ms and 50 ms.  Adjustment of the later 
> is usually not offered. 
>
> I get reliable operation of our area UIDIGI's with old Motorola Micors 
> at TXD of 100, but I am not sure of the impact upon others users 
> ability to decode, nor am I sure if the reduction in congestion is all 
> that significant.
>
> Ron, AE5E (ex N5IN)
>
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