Telit Wireless Solutions ME310G1 - GNSS Antenna - Installation Guidelines; Powering the External LNA (Active Antenna); GNSS Antenna Specification

ME310G1 Hardware Design Guide
1VV0301588 Rev. 16 Page 59 of 95 2021-10-27
Not Subject to NDA
8.3.1 GNSS Antenna Specification
Item
Value
Frequency range
1559.0 ~ 1610.0 MHz
Gain
15 ~ 30dB
Impedance
50 ohm
Noise Figure of LNA
< 1.5 (recommended)
DC supply voltage
DC 1.8 ~ 3.3V
VSWR
≤ 3:1 (recommended)
Table 39: GNSS Antenna specification
Note: For a short antenna cable the minimal gain must be 15dB.
For a long antenna cable the minimal gain must be 30dB.
8.3.2 GNSS Antenna – Installation Guidelines
• For best performance of the GNSS receiver, the antenna must be installed
according to the antenna manufacturer’s instructions.
• The performance may degrade if the antenna is installed inside metal cases or
near obstacles such as antenna lobes and gain.
• Evaluate the antenna location if it is connected to other antennas or
transmitters.
8.3.3 Powering the External LNA (Active Antenna)
The active antenna requires either 1.8V or 3V DC power supply. To meet this requirement,
an external power source with the ME310G1 module must be included in the user’s
application circuit.
The electrical characteristics of the GPS_LNA_EN signal are:
Table 40: GPS_LNA_EN signal characteristics
Level
Min
Max
Output High Level
1.6V
1.9V
Output Low Level
0V
0.3V