User's Guide

Hardware description
Figure 19: External GPS antenna connector
The LNA enable signal is controlled by the logic circuitry. It is enabled only when the antenna tuning
circuitry is set to operate at the GPS frequency band. The LNA makes the GPS receiver more sensitive to
GPS signals and less sensitive to interference from other sources nearby.
Figure 20: GPS circuit schematic
Note: GPS signals do not usually penetrate ceilings or other structures. For best GPS performance,
Nordic Thingy:91 should be used outside in an open space, far from sources of interference and
other structures that may block the signals.
6.3.4 SIM card
Nordic Thingy:91 is equipped with a nano-SIM (4FF) card slot.
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