OPERATION
The possible status messages displayed are:
Doing GPS Corrections.
GPS Time Not Acquired.
PDOP is Too High.
No Usable Satellites.
Position Survey XXXXX
ZZZZ Stabilizing XX.
Unit Stabilizing XXX
Flywheel Mode.
The “STATUS CODES” are via the RS-232 I/O when requested, and output by the printer port if
the option is implemented. The characters S00 through S15 are printed for the status.
The status message, “DOING GPS CORRECTIONS” is an indication that the GPS Unit is
performing the tasks appropriate to the selected mode of operation. The operational modes
include AUTO, DYNAMIC, STATIONARY, and FLYWHEEL selections. The various modes
will be detailed in subsequent sections of this User’s Guide and are listed here only to aid in
understanding of the “STATUS MESSAGES.”
The status message “PDOP IS TOO HIGH” indicates that the Position Dilution Of Precision
(PDOP) exceeds a limit.
The status message, “NO USABLE SATELLITES” is similar to the “DOING GPS
CORRECTIONS” status message, except that the GPS Time has been previously acquired and
has been maintained to at least the oscillator reference precision since the last usable satellite
was visible. Refer to the paragraph titled “Set Mode (Mode Selection)” in this chapter.
The status message “ZZZZ Stabilizing XX,” where the two digit number (ten to 00) following
“ZZZZ Stabilizing” represents how far away the oscillator is from stabilization. At power on it
will be ten and then down count to 00. The length of time the unit has been OFF and the
ambient temperature will affect how long the oscillator takes to stabilize. Refer to paragraph
titled “Operational Steps” in this chapter. The “ZZZZ” indicates the type of oscillator installed
in the unit. It can be a TCXO (Temperature Controlled Crystal Oscillator), an OCXO (Oven
Controlled Crystal Oscillator), an LPRO (Low Profile Rubidium Oscillator), or an X72
(Rubidium Oscillator).
The status message “Position Survey XXXXX” where the five digit number after the message
“Position Survey” represents the number of averages remaining before the LOCKED LED will
illuminate. The number starts at the maximum number programmed (default is 200) and counts
down to 0000. This message is applicable only in the AUTO MODE of operation. Refer to the
paragraph titled “Number of Position Averages” for selection of number of averages.
Symmetricom Inc ET6xxx ExacTime GPS TC & FG (Rev C) 3-7
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