SX1232 RFI Source Impedance Per AN1200.16

What’s up Semtech.

In AN1200.16 there are multiple antenna matching procedures for SX1232. For the split path case they come up with LNA match and source impedance at the RX input (RFI port) of 28.5 + j41.7 at 915 MHz. Is this the actual source impedance of the SX1232 at the RFI pin or are these just random numbers used in this example?