Terminal Node Controller in a router

[Andrew] used a DSL router to make his own Terminal Node Controller. This will become part of an APRS-IS network, an Internet-based network built by amateur radio operators. The router used here is a Dlink DSL-502T with an AVR based TNC module attached to the serial port header. The phone line connector and its accompanying hardware have been removed to make room for the TNC module, which is supplied with 12V via that red wire. When the router boots up it sends data to the serial port header so the firmware on the TNC needed some tweaking to accommodate this (yay for open source).

Want some more APRS goodness? Check out this AVR APRS tracker.

WhereAVR APRS tracker

WhereAVR_Board

We posted a story about someone doing some APRS tracking recently. This is old news to some, but new fresh stuff for others. If you want to build your own tracker, here’s a great writeup on one.  The WhereAVR is low cost, low power and has plenty of I/O.  With all of the schematics and PCB files available on his site, you should be able to get one working in quickly. He does need a little help building a nice simple configuration tool to work in windows, anyone want to volunteer?

APRS tracking

aprs

We really wish we had a little more information on the construction of this, but [Jeff] made this APRS tracker several years ago. APRS, or Automatic Packet Reporting System is a system where shortwave radios put out small packets of data that are uploaded to a database available via the web. This specific one is relaying GPS data so his family can see where they are located. With current phones, you might think this is antiquated, but he notes that he took this through New Mexico and was able to transmit his position even when there was zero cell phone coverage.