Instruction manual

MXS-EVO - MANUAL
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MXS-EVO – Manual – Rev 1.7 - 35 -
Appendix A: Quality Factor
General Review
This appendix is intended to illustrate the meaning and motivation of the introduction of the Quality Factor within the
Digital Instruments equipments.
Although the installation of a GPS device is relatively easy, it can hide certain issues that in some cases it can affect the
proper functioning.
It is therefore expected to monitoring certain operating parameters so as to make immediate validation of a Circuit or
finding the source of any problems.
GPS antenna positioning
GPS antenna should be positioned on a tower or on a roof with a good view of the GPS satellite constellation.
GOOD BAD
POSITIONING POSITIONING
If not, the algorithm of regulation may not behave optimally and short term stability of the PPS and 10 MHz references
it could be invalidated.
It’s possible to evaluate the goodness of the positioning of the antenna in some ways:
1. checking the power of received signal from each satellite from the Polar Plot
2. checking and verifying that the Quality Factor is acceptable (typically> 25)
3. checking that the PPS generated by the radio (PPS Status) is valid (green LED)
Se così non fosse l’algoritmo di disciplinamento potrebbe non comportarsi in maniera ottimale e la short term stability
dei riferimenti PPS e 10 MHz ne potrebbe venire inficiata.