User`s guide

Chapter 3 - Receiver Descriptions
Received Carrier to Noise Density Ratio (C/No)
The Position/Status/Data Message output C/No for each receiver channel, which can be used to
determine the relative signal levels of received satellite signals (refer to Figure 3.9 below). C/No is
the received carrier to noise density ratio. The units are dB-Hz, where No is the noise density
ratio received in a 1 Hz bandwidth. The C/No may be converted into received signal strength
using the plot in Figure 3.9.The satellite signal strength is measured at the antenna input. Typical
"good" C/No numbers reported by an M12+ with a properly installed antenna system are between
40 and 55 dB-Hz.
Figure 3.9: Approximate Signal Strength vs. Reported C/No
Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05
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