# LC Network in Microchip's LoRa Gateway

I am reading the microchip's LoRaWan Gateway manual. On Page 48, I got stuck at receiving side on the LoRaWan RF circuit. It looks like they have some sort of LC Low Pass Filter. I have used this online tool to calculate it's cutoff frequency. It gave me following reading:

Results:

F = 3.3553e+9 [Hz]

Z = 31.623 [Ohms]


I am not sure about the Resistor in between them. Please help me in verifying my interpretation of the circuit. The part of schematics that I am referring has been posted below:

Can someone help me in understanding the part of the circuit that have been encircled. 1257_RFINA and 1257_RFINB goes to RF inputs (Single-ended) of two different RF transceiver chips (SX1257). TA1567A is SAW Filter and SPF5043Z is LNA.