DC on RFin on LIV4F GPS Module

[shooten]

Is there a way to turn the DC off on the RF_IN port on the LIV4 GPS module?  There must be an enable or disable feature available via firmware.  Thanks for reading.

Scott

[GalaxyQuest]

Hi,

The capability to turn off DC bias in RF_IN line on LIV4F is not provided.

May I ask what is the use case for having this off? Is it trying to connect an active antenna with different input voltage?

 

[shooten]

We're supporting LIV4 and LIV3 on the same board and have an L1/L5 LNA in
front of the device. The DC is causing problems for us. We do not use an
active antenna. Thanks for the reply.

[GalaxyQuest]

Ok, the RF signal chain is slightly different for LIV3F and LIV4F. 

In this case you might have to put a blocking capacitor in front of LNA.