[time-nuts] Truetime XLi sat signal levels (dBW to dBc/SNR conversion question)

[Mark Sims]

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.

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>  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.