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  ACQUA Front Ends     HGT I - Overview
HGT I (Code 6472) - HEAD GPS Timebase
HGT I is a device for the generation of exact time data as timebase for delay measurements. Initially, HGT I is calibrated in stand-alone operation outside a building. During calibration the GPS clock within the device is synchronized with the UTC time of the GPS system.
Upon completion of the synchronization phase
HGT I can be used inside buildings without requiring further GPS signal reception, because the internal clock now generates clock pulses (1 per second) with a maximum deviation of +-1 ms during 8, 24 or 72 hours.
By means of these clock pulses two HGT I devices can be used simultaneously to conduct highly precise delay measurement between any two global locations.
Front and rear view HGT I
Click here to enlarge
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