Operating Manual GPS Receiver (built-in)
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GPS receiver
The GPS receiver is built into the Time Code generator. An active antenna is connected via
a 50 Ωcable at a SMA female connector. It’s built-in pre-amplifier is supplied via the
same cable. No passive antenna must be connected, as this normally causes a DC short
circuit.
When the unit is powered off, the real time continues counting battery-powered with the
accuracy of the x’tal (approx. 10-4 ). So when the unit is powered on, a time information
will be available immediately. With the first synchronous reception of the GPS receiver
(under normal conditions of reception this will take 10 minutes approx.) a switch-over to
GPS time is made. This time is transferred to the timecode generator with an accuracy of
±2µs approx. for the seconds pulse (± 20µs for the serial telegram). If then a GPS
reception failure occurs, the time will continue counting with an accuracy of 1µs per second
(10-6). The only pre-condition is that the temperature-compensated x’tal has meanwhile
reached the operating temperature.
The switch-over for Daylight Saving Time will be made automatically. The only time
supplied by GPS is the world time UTC (Universal Time Coordinated), i.e. the receiver does
not supply any information about the moments of time for the switch-over. Therefore, this
time is defined according to the current valid legal provision regarding the Central
European Time (CET/CEST), i.e. the last Sunday of March resp. October at 1:00 UTC. If
such switch-over is not required, the receiver may be switched via internal dip-switch to
UTC.
Specifications
Antenna input 1575,42 MHz (L1 band), -130 dbW
to -163 dbW
Connector SMA female, 50 Ω
Antenna type active
Power supply pre-amplifier 5 V DC, 100 mA max., short circuit proof
Time from power-on to first synchronous
reception
10 minutes approx.
Battery 3 V lithium, working life: 10 years
Date validity until 31.12.2017
Accuracy (of P_SEC leading edge):
in free-running mode 10-4
with synchronous reception ± 2µs
in free-running mode after first synchronous
reception
10-6
