The 30 dBc refers to the signal level reported by the Ublox.   If the Ublox 
falls below around 30, the Truetime will be reporting -196 dBW.   That seems to 
be the cutoff threshold for its idea of a "good" signal... it does not have a 
user settable signal level mask     My conversion formula works very well over 
the full range of usable signals and matches what the Ublox is reporting within 
1 dB.

------------------

>  When you refer to "30 dBc", what is that?   Is it the eb/n0 value?  If so,
with the XLi's behavior as you report it, your scheme would fail over most of 
the useful
signal range.
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