Trimble Outdoors 58052-00 Benutzerhandbuch

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Copernicus GPS Receiver     7 1
RF LAYOUT CONSIDERATIONS     6
In the printed circuit board (PCB) layout, it is recommended to keep the copper layer 
on which the Copernicus GPS Receiver is mounted clear of solder mask and copper 
(vias or traces) under the module. This is to insure mating of the castellations between 
the Copernicus GPS module and the board to which it is mounted, and that there is no 
interference with features beneath the Copernicus GPS Receiver causing it to lift 
during the re-flow solder process.
For a microstrip RF transmission line topology, it is recommended that the layer 
immediately below the one to which the Copernicus GPS Receiver is mounted be 
ground plane. Pins 2 and 4 should be directly connected to this ground plane with low 
inductance connections. Pin 3, the RF input, can be routed on the top layer using the 
proper geometry for a 50 ohm system.