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

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
http://taoglas.com/images/product_im...F.07.0045A.pdf

thanks in advance

regards

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

../imgqa/eboard/Antenna/rf-p351low5byv.jpg

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.