[time-nuts] LPRO data

[ew]

The Datum 2000 is mainly an instrument for work on PDH, SDH and Sonet. For that it has 10 outputs but also one 5 MHz and one 10 MHz. It has a LPRO Rb and a MeanWell 24V 60 W power supply. Only a simple LC filter between power and Rb. All circuits on the left are to generate 2048 and 1544 KHz. The unit has two modes. In one input you can put a reference like a Cs and within 30 minutes it calibrates the LPRO. Done even if you leave it connected no more adjustments. Will memorize last setting to move to test site.
 The second TNC input has 24 V and receives 10 MHz contentiously from an external GPSDO. This signal when present is controlled continuously by a 24 hour filter! I can observe that function after power up and it takes about 24 hours till it is +- 2 E-12 according to my Adret versus HP5065A. Frequency! This is a continuously averaging 24 hour digital filter!

Attached a picture and frequency without Tbolt and an AV plot locked Datum versus HP. With out Tbolt puts the Datum on hold and you get an idea of the LPRO performance. Stupid AOL will not allow me to add one more AV plot. Will try later
Bert Kehren
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