When switching between PPP services, the LD4 unit must have a power reboot performed. If the LD4 does not receive a reboot, the solution will become unstable.
To complete this, remove power from the LD4, wait 15 seconds and reapply power.
Note: When using an LD4 with a PPP service (Apex or Ultra), the user is able to change the selected PPP service being computed. To perform this action Septentrio Rx Tools software is required. The option to switch PPP service is found in the Rx control module. From the main menu select Navigation > Positioning Mode > Differential Corrections, then select the desired PPP service (if Apex and Ultra services are enabled on the unit):