Preparations for LoRa antenna testing
This page is description how to disassemble partly potted Lion tracker for Antenna tuning.
Lion tracker comes with assembled PCB, soldered EMC shield and soldered battery.
Lion tracker fully assembled (negative terminal of battery is aligned with end off EMC shield) How to get to antenna tuning circuit
Step 1: Desolder battery positive terminal
Step 2: Desolder battery negative terminal
Step 3: Desolder EMC shield
Preloaded SW on devices
LoRa_setTxContinuousWave_vswr
- Frequency scan from 800MHz to 900MHz
LoRa_setTxContinuousWave_vswr_tune
- DTC scan at 868MHz from 0 to 32 (1,4pF to 13,61)
How to activate device after battery soldering to Lion tracker
Every time battery is soldered to board a battery protection circuit needs to be activated.
Make contact from battery negative terminal to EMC shield to activate device.
How to read UART messages from device
Connect USB<->UART adapter to device pin as shown in picture above.
Schematic and PCB design
All design can be found on github
