Meinberg GPS161 - Manual (Page 6)

6
GPS161 features
The satellite receiver clock GPS161 is as a compact board with dimensions of 80 x
120 mm. The module contains four mounting holes (diameter 3 mm) for easy
integration into the application of the user. The power supply and input/output
signals are available via a 26-pole contact strip. The receiver is connected to the
antenna/converter unit via a BNC-connector by using a 50
Ω-coaxial cable with a
length of up to 300 m. It is possible to connect up to four receivers to one antenna by
using an optional antenna diplexer.
The navigation message coming from the satellites is decoded by GPS161´s micropro-
cessor. Depending on the oscillator option the GPS system time is tracked with an
accuracy of better than ±250 nsec (TCXO HQ/OCXO LQ) or ±100 nsec (OCXO MQ/
OCXO HQ). Compensation of the RF signal´s propagation delay is done by automatical
determination of the receiver´s position on the globe. A correction value computed from
the satellites´ navigation messages increases the accuracy of the board´s master oscillator
and automatically compensates its aging. The last recent value is restored from the
battery buffered memory at power-up.