LE910Cx Hardware Design Guide
1VV0301298 Rev.40 Page 66 of 149 2023-03-16
Not Subject to NDA
GNSS Antenna Requirements
LE910Cx supports an active antenna.
It is recommended to use antennas as follow:
An external active antenna (From 14 to 17 dB typ. Gain, GPS only)
An external active antenna plus GNSS pre-filter (From 14 to 17 dB typ. Gain)
Note: If Rx Diversity is not used/connected, perfectly disable the
Diversity functionality using the AT#RXDIV command (refer to Ref 1:
LE910Cx AT Command User Guide) and connect the Diversity pad F1
to a 50 Ohm termination or floating
Note: 80502ST10950A_LE910Cx AT_Commands_Reference_Guide
document must be referred to install passive or active GNSS ANT
configuration by customer.
Note:
If the GNSS is not used/connected, please disable the GNSS
functionality perfectly using the AT$GPSP command (refer to Ref 1:
LE910Cx AT Command User Guide) and connect the GNSS pad R9 to
a 50 Ohm termination or floating.
Note:
The external GNSS pre-filter is required for the GLONASS
application. The GNSS pre-filter must meet the following
requirements:
Source and load impedance = 50 Ohm
Insertion loss (1575.42–1576.42 MHz) = 1.4 dB (Max)
Insertion loss (1565.42–1585.42 MHz) = 2.0 dB (Max)
Insertion loss (1597.5515–1605.886 MHz) = 2.0 dB (Max)
Note:
It is recommended to add a DC block to the customer’s GPS
application to prevent damage to the LE910Cx module due to
unwanted DC voltage.
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