1) 15 seconds only matters, if someone can hear my packets. That is still an issue, as they are not getting through for some reason. Maybe 5 to 10 get through and are displayed on APRS.FI for the 20 minute trip to work in the morning. Nothing else gets through. The packet frequency is not that busy. I can hear packets from several other stations, and they all display on my Nuvi 350.
2) Have tried setting SMART to ON with appropriate parameters (as suggested here), and an INTERVAL of 2 minutes. With these settings, I get two or three packets through on my 20 minute trip. 3) Do I have something wrong? Does a packet contain all the last several coordinate breadcrumb trails in it (several gps coordinate sets that are stored over the last several minutes)? Or does a packet only contain the last single coordinate set, for the moment? I think the latter. 4) I can hear the packets fine with my stand alone HT radio, with APRS. They should like everyone elses packets. But maybe I do need to adjust the volume settings (what is that command?) so that the modulation is improved. Maybe I am undermodulating the packet, with my audio from the TRACKER? 5) Also need to check my radio and its baud rate. Do not recall if it is set to 1200 or not. It should be at that setting I assume? Thanks for all the comments. They all make sense during investigation of optimal APRS.
