Symmetricom ET6000, User Manual

Page: 36 / 206

CHAPTER THREE
OPERATION
3.0 INTRODUCTION
This chapter describes the operation of the basic GPS ExacTime. Operating instructions for the
optional features are contained Appendix C of this User’s Guide.
Note: The GPS antenna and cable described in this manual have been replaced as described in
“Appendix D: Antenna Replacement Kit” on page D-1.
3.1 OPERATIONAL STEPS
The following are the initial installation steps necessary for the operation of your unit:
•
Connect the appropriate input/output cables and components including as a minimum the
power cable, the antenna, and antenna cable.
•
Apply power to the unit. Initially the front panel TRACKING and LOCKED LED’s will
flash and the POWER LED will illuminate. This signifies that the microprocessor and
associated circuitry have been initialized correctly and are operating.
•
At this point, the Operational Mode needs to be selected. See the section entitled “SET-UP
MENU SCREEN – SET MODE” (this chapter). The criteria for selecting the various modes
can be summarized as follows:
AUTO – Use if your position (i.e. the position of the antenna) is unknown, and
stationary. This is the default mode. See section titled “Initialization (Unknown
Position).”
DYNAMIC - This mode would be selected if the unit is mounted in a moving vehicle.
By definition, your position is unknown. See section titled “Initialization (Unknown
Position).”
STATIONARY - Use if your position is known, stationary, and accurately surveyed.
See the section titled “Initialization (Known Position).”
FLYWHEEL – To use your unit as a time code generator only. Position is not
determined and the internal oscillator is not disciplined.
3.1.1 INITIALIZATION (UNKNOWN POSITION)
•
Set the SET MODE to “AUTO” if it is not already in the “AUTO” mode. The unit will then
start to track satellites (refer to the Main Menu Screen – this chapter). When satellites are
acquired and ready for time solution, the TRACKING LED will illuminate signifying that
the unit is tracking satellites.
Symmetricom Inc ET6xxx ExacTime GPS TC & FG (Rev C) 3-1