nRF9160 CN0 too low

[Ye-Sheng]

Hi,

I'm testing the nRF9160 GPS performance with a GPS simulator. I set the output power to -130 dBm and test the nRF9160DK conductively. I made some small modifications so the signal still goes through the onboard LNA. The returned CN0 was somewhere around 25 dB-Hz. I'm expecting the value around 40 dB-Hz. Any thoughts?

I'm using the 1.3.1 modem FW, and 1.7.1 SDK with GPS example. 

Thanks,

[Ye-Sheng]

whoops, it turns out everything is correct. We misinterpreted the CN0. At -130 dBm input power, the CN0 is somewhere around 40 dB-Hz.

Thanks~