T3-Micro
The T3-Micro is a Tracker3 in a USB dongle form factor. It includes an onboard GPS receiver and has only two external connections: USB and a radio port. Power is provided over the USB connector.
The T3-Micro can be: - Connected to a PC - Run from a USB car adapter - Powered by a standalone USB battery pack
This page only includes T3-Micro-specific information. For general Tracker3 documentation, refer to the main Tracker3 page.
TRRS Pinout
3.5mm TRRS connector (starting with tip):
| Pin | Function |
|---|---|
| Tip | Audio out (to mic) |
| R1 | PTT (open collector) |
| R2 | Audio in (from speaker) |
| Sleeve | Ground |
PTT Setup
The T3-Micro has no jumpers. Handheld PTT mode — required for most handhelds except Kenwood and most Chinese imports — is set using:
- The command:
HTPTT ON - Or by checking HT PTT in
otwincfg.exeunder the Radio Interface panel
You must write the new configuration before the change will take effect. Requires firmware build 56471 or later.
On-Board GPS
- Enable NMEA pass-through with
NMEAPASS ONor the NMEA P/T checkbox in otwincfg - Works in both console and KISS mode
- GPS runs at 9600 baud, connected to port A
- Set port A to 9600 baud and AUTO mode
APRSISCE/32 Setup
To use T3-Micro with APRSISCE/32:
- In otwincfg:
- Enable USB KISS
- Set interval to 0 (disables automatic transmissions)
- In APRSISCE/32:
- Create a new SimplyKISS port
- Enable GPS/NMEA and Messages
- Baud rate setting is ignored
