[aprssig] D72 TXD delay TX test

[Robert Bruninga]

Regarding Digis:

> ... long term if we did "compressed 
> bunching" we could save a LOT of time!!!!!
> ... "bunch/compress" all the output into one 
> burst would be much more efficient..

But undermines the fundamental purpose of APRS.  To keep the
mobile informed.  Bundling is great for the internet and shack
potatos.  But useless to the mobile operator since it would
prevent him from seeing on his heads-up display EVERYTHIG but
the last one.

Bob, WB4APR