[Moved] did I need LNA for this active GPS antenna

[manoa2015]

Hi all

I almost finish from make my own design for GPS tracker , but my aknowlegment is low with RF part ,

now I go to use this active antenna for gps which have two internal LNA built in , and it come with smd coaxial cable with IBEX terminal , as I know the coaxial cable come with to pair GND and signal, my question is


1- from where it feed power to internal LNA ?? where the coaxial cable have two wire inside ? GND and signal

2- did I need to to add extra LNA to my board ? or the LNA only for Passive antenna ?


this is active antenna manual
https://taoglas.com/images/product_images/original_images/AP.12F.07.0045A.pdf

thanks in advance

regards

 

[vfone]

You need a choke to feed the DC for the outdoor LNA through the center of the coax cable, as in the image below:

**broken link removed**

To add or not to add another LNA on your main board depends on what is your receiver sensitivity right now. Generally is ok to add another LNA on the board.