Yesterday I used one of John's excellent TICC modules for the first time and initially set up a quick test using the 10MHz output from a Thunderbolt as the frequency reference to measure the 1PPS from an Oscilloquartz Star4 GPSDO, with the TICC output feeding a USB3 port on a Windows 10 PC running the 64 bit version of Timelab 1.29. I'll attach a copy of the test plots I'm referring to but just in case this doesn't get through I've also uploaded it to.... https://www.mediafire.com/?9bue90yp1e8ueu6 Using the basic settings as described in the TICC manual the first run was for 1 hour and seemed fine so I decided to extend the run time to 6 hours. The first 6 hour test started to follow the 1 hour plot as expected and I watched this on and off and can confirm it did so up to somewhere between the 100s and 1000s points on the x-axis, but some time after that the complete plot shifted upwards and then continued to completion to produce the magenta trace. I wasn't watching when it shifted so don't know if it was a jump or a gradual shift but did see it continue until completion. When I repeated the 6 hour test, again without changing anything, and hoping to observe the effect as it happened, it produced the green trace which was what I'd been expecting to start with. Since then I've made other test runs and again all seems to be as expected. I'm probably missing something obvious but don't understand what's happened here so any suggestions would be welcome. Throughout the tests I have been simultaneously streaming data from the Star4 to Lady Heather via a "proper" serial port on the same PC so did wonder if there might be some form of data conflict but it doesn't seem to have shown up as any obvious form of corruption and hasn't repeated itself. Nigel, GM8PZR
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