[aprsspec] To CR or not to CR

[Tapio Sokura]

scott at opentrac.org wrote:
> Any consistency to what stations generate the CR-terminated packets?  I'm

Looks like UIDIGI does not put a CR into its packets. TM-D700 adds a CR. 
Kantronics digis have a CR in their beacons. OpenTracker doesn't add a 
CR, but I guess you knew that :-) Your guess on using a TNC in 
converse/terminal mode is probably in many cases related to whether a CR 
is added or not. I've also seen packets that end in a CR-CR-LF 
combination in the APRS-IS feed.

It also looks like most of the TNCs use AX.25 version 1 for sending the 
UI frames as source and destination callsign have the C-bit set to 
either both zero or both one. I guess in practice it doesn't matter 
which version you use, the rest of the packet has the same structure anyway.

   Tapio