All OpenTracker models use the same firmware and configuration program, but some hardware features differ. See the latest OT1 manual for software/firmware documentation.

T2-135 Manual (preliminary)

Model OT1
	Manual (PCB rev 4) Manual (PCB rev 3) Schematic, PCB Revision 2-3 (green or black) Schematic, PCB Revision 4 (red)
Model OT1x
	Manual German manual (Benutzerhandbuch) German assembly guide (Aufbauhinweise) Schematic (PCB Revision 3)
Extended board, designed to fit the PacTec CNS-0101 case. Includes larger voltage regulator. PTT keying method and audio level selectable through jumpers. 1-Wire data bus signal is accessible on the serial connector for connection to the 1-Wire Weather Station.
Model OT1m
	Schematic Release notes
The OT1m adds a 2.1mm power jack, RJ-11 accessory for 1-wire devices, and an optional 9 or 20 amp high-side switch to control power to a radio, particularly useful for solar powered weather stations.

Data Sheets

Revisions (OT1)

Revision 1 - Only a handful of these boards were produced. These boards did not have voltage measurement capability.
Revision 2 - Three variations were produced, all marked 'Rev 2'. They differ only in the board manufacturer and some minor trace routing changes.
Revision 3 - This revision adds a TTL-level carrier detect input and features an improved PCB layout and a black solder mask.
Revision 4 - 2N3904 transistors replaced with 2N7000 FETs. Larger voltage regulator, 5 volt output capability, and red solder mask.