Release notes for OpenTracker 1m, PCB revision 2 ------------------------------------------------ A proper manual for the OT1m will be release shortly. In the meantime, this document will cover differences between the OT1m and the standard OpenTracker. Note that the OT1m is capable of a higher audio drive level than previous versions. You may need to use the TX Level slider control in the configuration program to lower the audio level and ensure that you're not overdeviating. Pinouts: Radio Connector (DE9 Female) 1 Audio out 2 Squelch input 3 PTT out 4 Config Switch 5 Audio in 6 Ground 7 Power in 8 PTT in or ext voltage measurement 9 Optional 1-wire bus or generic I/O Serial Connector (DE9 Male, DTE) 1 n/c 2 Data in 3 Data out 4 Power 5 Ground 6 n/c 7 1-wire bus 8 n/c 9 n/c Accessory Connector (RJ12) (left to right) 1 Counter / Immediate transmit input (IRQ) 2 GND 3 GND 4 1-wire data bus 5 +5v out 6 Config Switch The accessory connector is wired for direct connection to the TAI-8515 1-wire wind instrument using a standard telephone cable, having the red and green wires swapped - NOT a straight-through cable. Jumper functions: JP1 Enable HT PTT mode (for most handhelds except Kenwood) JP2 1+2: Measure internal supply voltage in telemetry 2+3: Measure external voltage on X2 pin 8 in telemetry 3+4: Enable PTT input on X2 pin 8 JP3 Enable 1-wire data bus on X2 pin 9 JP4 Enable power control (not compatible with PTT input mode) JP5 Configuration select JP6 (marked '12' and '5') Selects output on X1 pin 4 12 - Output is unregulated supply voltage 5 - Output is regulated +5 volts Power control: The optional high-side switch can control an external load of up to 20 amps. Power leads for the controlled device should be connected to the OUT+ and GND pads on the circuit board. If the load to be controlled exceeds 1 amp, a high-current supply connection should be made through the IN+ and GND pads. Keep in mind that the IN+ pad is connected in parallel with the coaxial power jack and X2 pin 7.