i-Lotus RX Oncore, Руководство пользователя

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Document Number: 403
– GPS – 070
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9 Antenna circuitry
The RX Oncore is able to support both passive and active antennas.
It receives the L1 band signals at frequency 1575.42 MHz via the RFIN pin.
When designing the RF portion of any application with our module, the following considerations are necessary:

All PCB trace from RFIN pin is required to have 50

impedance: with passive matching circuitry.

For active antenna, the required voltage is to be catered by the host via VANT pin.

Active antenna gain should not exceed 50 dB, and the noise figure should not exceed 3 dB.
Fig 9.1 Antenna block diagram
The built-in antenna sensing circuitry coupled with the host’s ANTDET control the power supply to the active
antenna.
The sensing circuitry provides the following:

Active antenna sensing

Detection of short-circuit

Report the fault to the module MCU