I got in one of the older style Trueposition GPSDOs from China. This is the
board shown in the "Packrat" documentation. It uses a Bliley OCXO instead of
the CTS one on the newer board.
Other than the connector differences, the only significant hardware difference
seems to be the temperature sensor. This board has a 0.01C resolution. The
newer board has 0.03C resolution. The software command set seems to be the
same. Both output the same data. The older board tracks WAAS satellites like
the newer board.
The Bliley OCXO seems to be slightly better. It has same response to a cold
spray attack, maybe a little less sensitive. The older board seems to have
better holdover characteristics... there were only two brief "soft" holdovers
overnight (the actual status messages said they were wait states, so probably
not real holdovers. There was no PPS disturbance) The ADEVs on the older unit
are better than the newer board by around 30%.
Attached is the ADEV / PPS plot from a TAPR TICC.
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