[aprssig] TH-D7 and Group Code

Robert Bruninga bruninga at usna.edu
Tue Mar 7 13:01:01 CST 2006

The SPCL UNPROTO address does have special
meaining in APRS as you are aware.  But it is
mitigated somewhat by the fact that the D7 and
D700 also use the UNPROTO TO call for position
information.  Thus Mic-E devices cannot be excluded
by using the SPCL group code.

SO the leakages you are seeing are probably other
MicE devices?


>>> "Steve Sobodos" <steve at scsvideo.com> 03/04/06 8:46 PM >>>
I plan on using the D7's in search and rescue. I thought that putting SPCL in the group code (Unprotocol), the D7 would only "Hear" the other stations with the same code. I quote from the manual :"Enter "SPCL". You will receive only APRS packets that include SPCL as a Group Code."

The use in SAR is that the teams can see how close and what direction the other teams are. The problem in Southern California is that there are very many other stations and the list in the D7 gets so long it becomes quite a pain to find the other stations in the list. I set up a couple of D7's with the Group Code of SPCL but the D7 still hears everybody. 

What am I doing wrong? Is there another way to filter the D7 beacons?

The Group Code does me no good in UI-View as it seems to not be supported as a filter. I end using the callsign in the exclusions list in the form "!TEAM*" to only include calls that start with TEAM.

More information about the aprssig mailing list