SX BLUE GPS iSXblue II+ GNSSTM, User Manual

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SXblue Series User Manual 79
optimum location with respect to beacon reception. The SNR is available in the
$CRMSS and $PCSI,1 NMEA messages described in the Technical Reference
Manual.
The SNR is also a function of the installation, as it may differ between locations,
depending on the amount of local noise at each. The optimum antenna location
will be the position where your average SNR is highest. You should turn on all
accessories that you intend to use during normal operation to test the installation.
If noise is affecting performance, try to find a better location with higher SNR.
Table 3-1 below describes the general quality of reception as measured by the
SNR reading of the SXblue II-B GPS.
Table 3-1 SXblue II-B GPS Performance – SNR Reading
SNR Reception Quality Data Throughput
> 25 Excellent 100%
20 to 25 Very Good 100%
15 to 20 Good Good (up to 100%)
10 to 15 Stable Moderate to Good
7 to 10 Intermittent Low
< 7 No Lock No data throughput