Hi 1) Have you done a 3 day long survey at any of the locations? You need to do that to get the errors down. 2) Fiddling with the gain and filter settings on a NTBW50 isn't useful. The unit does *not* work the same way as a TBolt. Just leave them alone. 3) Because of the way the uint works there is *no* way to translate the LH display to frequency stability. 4) The OCXO in that unit is at least as good as a typical MV89. Since you have no way to "tune" the unit, replacing the OCXO is not a good idea. Also you may have to buy (and run long term ADEV tests on) a dozen MV89's before you get a "good" one.
If you want to check the *stability* of the GSPDO, get a cheap Rb. That's the *only* way to know what's going on. There is no display / measurement / technique that will answer the question looking at the GPSDO alone. Bob On Sep 18, 2013, at 10:11 AM, quartz55 <[email protected]> wrote: > Moved antenna to fence line on a 10' emt. Nothing much seems to change no > matter what I do, so I guess this is what I'm locked into unless I start > getting carried away. I still get generally about a 400 ppt swing with the > OSC, about 20 ns swing with the PPS and the other things are just what they > are. Different filters and surveys don't seem to change anything that I've > seen. I like the antenna better at the fence. but I had to add another 30' > of RG-6. I have about 100' of FSJ4-50B that I have no use for right now, but > I doubt that will do anything for me. > http://i251.photobucket.com/albums/gg287/DogTi/time/20139-181346_zps31fb89be.jpg > > Is this acceptable? From what I deduce, I can expect to get accuracy of > +-0.2 Hz at 1GHz? I was hoping for another decimal. This should be plenty > good to get mHz accuracy at 100 MHz if I can even measure that using SpecLab. > Seems to me Arthur was getting much smaller swings on his ppt with his older > Nortel. > > I did figure out the temp thing and found a link where it's explained, but I > have a new chip coming and expect to change it, but I doubt if anything will > change except the reported temp will most likely track to less than 1° C > unlike it's doing now. > > Would it be worth looking into the MV89A OCXO as a replacement to get better > ppt? I haven't done any looking into my OCXO yet to see what it's spec sheet > may be. > > Still waiting on a chip inductor that I messed up in the TS-2000 so I can get > the XRef working. > > Dave > N3DT > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
