http://www.evrytania.com/lte-tools/lte-cell-scanner claims the LTE reference is good to 0.05PPM.
I can verify that 739MHz and 751MHZ are the only LTE frequencies I found in use in the 700MHz band in the San Francisco Bay Area.
If you want to use the software, I suggest trying 739MHz and 751MHZ first. Get the calibration factor, then start the search with a reduced "p" parameter. The initial search assumes a ppm error in the SDR of 120PPM. However, once you get the calibration factor, you can used the reduced PPM parameter which substantially improves the search speed.
I haven't found a program to actually use the LTE frequency reference for say NTP. Maybe satcom Dave has time on his hands. ;-)
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