Hi! Although this will not be my final setup the measurements had already started with "Tbolt OCXO replaced by LPRO" and are now done. I think some of you might be interested of the results. Here's some Lady Heather logfiles and couple of pictures. Unmodified Thunderbolt in my place (many trees at the yard etc): http://www.amigazone.fi/files/gpsdo/tbolt-default.log http://www.amigazone.fi/files/gpsdo/tbolt-normal.jpg (Includes short holdover test at the end) Unmodified Thunderbolt in holdover mode: http://www.amigazone.fi/files/gpsdo/tbolt-holdover.log Unmodified Thunderbolt OCXO performance (disciplining off): http://www.amigazone.fi/files/gpsdo/tbolt-ocxo-freerun.log OCXO now replaced with LPRO, normal run: http://www.amigazone.fi/files/gpsdo/tbolt+lpro.log OCXO replaced with LPRO, disciplining turned off: http://www.amigazone.fi/files/gpsdo/tbolt+lpro-freerun.log http://www.amigazone.fi/files/gpsdo/tbolt+lpro-freerun.jpg This final test simulates my planned setup (without final cleaning loop however). Next thing is to try to get some ADEV charts with Ulrich's Plotter. For some reason it shows only e-1 values for now, the actual shape of the trace looks ok. Have to learn about the settings... -- 73s! Esa OH4KJU

Esa Heikkinen wrote: > Hi! > > Although this will not be my final setup the measurements had already > started with "Tbolt OCXO replaced by LPRO" and are now done. I think > some of you might be interested of the results. > > Here's some Lady Heather logfiles and couple of pictures. > > Unmodified Thunderbolt in my place (many trees at the yard etc): > http://www.amigazone.fi/files/gpsdo/tbolt-default.log > http://www.amigazone.fi/files/gpsdo/tbolt-normal.jpg > (Includes short holdover test at the end) > > Unmodified Thunderbolt in holdover mode: > http://www.amigazone.fi/files/gpsdo/tbolt-holdover.log > > Unmodified Thunderbolt OCXO performance (disciplining off): > http://www.amigazone.fi/files/gpsdo/tbolt-ocxo-freerun.log > > OCXO now replaced with LPRO, normal run: > http://www.amigazone.fi/files/gpsdo/tbolt+lpro.log > > OCXO replaced with LPRO, disciplining turned off: > http://www.amigazone.fi/files/gpsdo/tbolt+lpro-freerun.log > http://www.amigazone.fi/files/gpsdo/tbolt+lpro-freerun.jpg > > This final test simulates my planned setup (without final cleaning loop > however). > > Next thing is to try to get some ADEV charts with Ulrich's Plotter. For > some reason it shows only e-1 values for now, the actual shape of the > trace looks ok. Have to learn about the settings... > > Esa The first thing you have to do when using PLOTTER is to scale the phase values (they are in nanoseconds). Simply set the coefficient of y to 1.000E-9 in the scale dialog. With only 20,000 or so phase values the estimator OADEV degrades considerably in accuracy for tau > ~2000 sec or so, TOTDEV is better in this respect. THEO_1 and its variants are even better estimators in that they make more effective use of the available data. Bruce