Abstract
The UTC (NPLI)* is based on a Hewlett-Packard Commercial Cesium clock out of a group of four such standards. Linkage of this time scale was started in 1979 using VLF signal reception, periodically confirmed using portable clock trips. VLF measurements were continued till middle of 1984. In the meanwhile since 1983, the UTC linkage was supplemented using measurement on the NNSS signal. Using these measurements and similar data obtained from USNO it was possible to obtain a link UTC (NPLI)-UTC (USNO). The results were in good agreement with the VLF measurements except for a discripancy of 15 μsec. The NNSS was discountinued in June 1985 as the USNO data was no longer available.In August 1986, a GPS receiver was acquired and after art initial process of testing and commissioning, regular data taking on an observation schedule prescribed by BIH was started in February, 1987. Using the data in commonview mode with PTB, computations are being made of UTC (NPLI)-UTC (PTB). The GPS data is also currently being communicated to BIH.
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