TCXO frequency & CPU clock tuning for best PPS precision

IoT Modules GNSS Module
1

Hello — please help with the following questions about Quectel module parameters:

  1. How should I correctly configure the TCXO frequency parameter $PSTMGETPAR,1245 (TCXO Frequency)?
  2. How should I correctly configure the CPU clock speed parameter $PSTMGETPAR,1130 (CPU clock speed)?
  3. To improve PPS accuracy, is it correct that the CPU clock speed should be set equal to the PPS Clock?
  4. What are the maximum supported values for the PPS Clock and for the CPU clock?
2

Hi @ezus

May i know which module and firmware you are using?

best regards,

4

Hi, @YongHuang
We are using L26-T