The original OpenTracker was discontinued when the Freescale MC908KX8 microcontroller ceased production.
[http://groups.yahoo.com/group/opentracker/ OpenTracker group on Yahoo Groups
OpenTracker Revision History
All circuit boards have the revision number printed on the board, usually in the lower right corner. The OpenTracker optionally came a translucent case, with several color choices, and was the only series to use a colored case.
Revision 1: This revision only had a few trackers (20-25) produced, and they did not have voltage measurement capability.
Revision 2: This revision had three variations, all marked "Rev 2". They differed only in the board manufacturer and some minor trace routing changes. Green circuit board.
Revision 3: This revision added a TTL-level carrier detect input, and featured an improved PCB layout. Black circuit board.
Revision 4: This revision replaced the 2N3904 transistors with 2N7000 FETs. A larger voltage regular was used, with a five volt output capability to power a GPS. Red circuit board.
OpenTracker 1x (OT1x)
The OT1x was the second APRS tracker produced, and it featured an extended circuit board that was designed to fit the PacTec CNS-0101 case. The case is opaque with a hole drilled for the LED. This product was replaced by the OpenTracker+, due to the discontinuation of key components.
OpenTracker 1x Revision History
Three revisions were made of the OT1x, and all used the same manual. All circuit boards had the revision number printed on the board. The revisions were primarily mechanical changes and a couple of parts substitutions.
Compared to the OT1, the OT1x had the following improvements:
- Larger voltage regulator
- Output voltage selected with a jumper
- PTT keying method and audio level selectable through jumpers
- 1-wire data bus signal accessible on the serial connector for connection to the 1-Wire Weather station