Novatel OEM Series User Manual

Also see for GPSCard OEM4-G2: Quick start guide

Contents

Novatel OEM Series User Manual Manual pdf 51 page image

Operation Chapter 4OEM4 Family Installation and Operation User Manual Rev 12 514.7 T Sync ModThis section describes the relationship constraints of the input signal phase, see Figure 16 below,when the T Sync Mod (time synchronization modification) option has been added to an OEM4-G2.Figure 16: Input Signal Phase Relationship ConstraintsThe 10 MHz and 1PPS signals must maintain a phase relationship, as in Figure 16, when entering theunit. The 1PPS signal must not fall within ± 5 nanoseconds (ns) of each peak or dip of the 10 MHzsine wave. These are areas of instability and should be avoided. The best performance is maintainedwhen the 1PPS negative strobe is in phase with the crossover points of the 10 MHz source signal. 1To adjust the phase relationship between the 10 MHz and 1PPS signals, add additional RF cable to the10 MHz line. For example, if using RG58 coaxial cable, each 1 meter length of cable will move the 10MHz phase by approximately 5 ns.1. Internal document only: D04388± ±5 nSec 5 nSec10 MHz Source Signal1PPS Source signal100 nSec