[aprssig] Lowercase callsigns in AX.25/APRS messages

Andrew P. andrewemt at hotmail.com
Fri Feb 17 14:58:38 CST 2012

In debugging my APRS client, I have noticed a few (very few) stations using lower case in their callsigns. Is this legal? It's obviously possible, since they are out there. 

Since they exist, should my application:

1. Match on their callsign using case-insensitive matching or case-sensitive?

2. Force users of my application to enter their own callsigns in uppercase?

3. Forcibly upshift their callsigns in the headers of forwarded/digipeated messages and/or displayed status tables?

Example received from APRS-IS (I replaced my gateway's callsign with XXXXXX):


Just curious how to handle these.

Andrew Pavlin, KA2DDO
Sent from my Verizon Wireless BlackBerry

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