[aprssig] Amount of "padding" before and after data at 1200 baud?

Scott Miller scott at opentrac.org
Fri Jul 21 13:09:55 EDT 2017

The preamble length also depends on how fast the receiver locks on and 
how fast the receiving modem gets clock sync.  I'd say 100 ms would be a 
minimum for normal APRS use, and I think my trackers default to 200 ms.


On 7/21/2017 8:44 AM, Alan wrote:
> In adjusting the TXDelay and TXTail parameters, is there a recommended number of ms before and after the data that you want actually transmitted?  With conventional rigs, it is relatively simple to take a guess, and tweak it slightly until it is reliable.
> In working with DSP rigs, not only is the internal latency significant, but in some cases not entirely reproducible.  That is, you can send a series of beacons, and the timing will vary from one to the next.  I can look at the actual output, and would like to know what the minimum recommended times are so that I can insure that without just brute forcing long unneeded transmission times.
> 73s,
> Alan
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