Technical data
Appendix A - Technical Data Symmetricom(PPGPS Receiver
Operation
The installation of the system is described in detail in Chapter 2 - of
this manual. A minimum requirement for operation of the GPS Receiver
being the connection of the antenna, the lightning arrestors plus the
grounding and power cables. Once powered, the GPS Receiver will
automatically start to work and commence the Position Location
sequence described on page 2-22.
Due to the need to warm up the oscillator, the equipment will need a
warm-up period of approximately 6 minutes (Red flashing). When the
oscillator has warmed up, the green LED starts to flash. Once frequency
is within specification, the Green LED will be permanently illuminated.
LED Indication Mode
Red (flashing) Warm-up
Green (flashing) GPS but no-sync
Green (steady) Normal Operation
The GPS Receiver will retain its configuration and last position fix in
memory when powered down, so that when switched on again, it will
recommence working without further intervention.
Indicators
A set of three function (or mode) indicators is located on the front panel.
These consist of colored LEDs configured to illuminate as follows:
RED (flashing) Warm-up mode.
RED Alarm
indicates failed self-test, or timing out of
specification.
YELLOW No GPS - Holdover Mode
indicates that the oscillator is not
synchronized to the GPS satellites.
GREEN (flashing) GPS - no sync.
frequency outputs NOT synchronized.
GREEN
Oscillator lock indicates that the oscillator is
locked to
the GPS satellites frequency.
GPS Timing Receiver Installation and Operation Manual
3-2