FLEX-6400/FLEX-6600 Hardware Reference Manual
Page
43 of 45
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Once satellites are acquired and the synchronization process has begun, the MSI will
change to a SHORT FLASHING BLUE to indicate “locking” mode.
Upon reaching
full “lock
ed
” mode, the MSI
will go to SOLID BLUE. Once locked, the
GPSDO may re-synchronize occasionally due to satellite changes. A LONG FLASHING BLUE
will indicate this “hold phase”.
If GPS satellites are no longer visible, the GPSDO will enter “holdover” mode and the MSI
will indicate SOLID YELLOW. The radio will continue to be completely functional, but the
frequency accuracy could diminish to +/-2x10
-8
over time. The GPSDO is configured to
remain “powered” even when the radio is off. This maintains frequency accuracy of the
GPSDO. The MSI shows SOLID AMBER.
I - Initial GPS acquisition and synchronization can take up to 1 hour depending upon
antenna placement and your location on Earth. This is normal, and the radio is fully
functional during this process.
I - GPSDO self-installation is possible and is covered in a separate installation manual
included with the GPSDO OPTION KIT.
