Sierra Wireless AirPrime XA1110, Руководство по конструкции аппаратуры, Страница: 13 / 36

General Rules for Design
Rev 3.0 Aug.19 13 41111116
Figure 2-9: Unictron Schematic
Figure 2-10: Unictron PCB
Check the antenna datasheet before tuning RF to match the component footprint
(such as: C26, C27, C28, C29, C30). You can tune based on PCB size and
housing to tune for an optimal value in order to meet the GNSS’s frequency and
for good reception.
Unictron web site: http://www.unictron.com/index/
Note: The values for C26,C27,C28,C29, and C30 are tuned based on your trace.
External Antenna of Specification
When selecting your external antenna, refer to the specification shown in
Table 2-2 and Table 2-3 below.
Table 2-2: GPS/GLONASS External Antenna
Characteristic Specification
Polarization Right-hand circular polarized
Frequency Received 1.575GHz~1.615GHz