GNSS noise - Printable Version

+- PINE64 (
+-- Forum: ROCKPRO64 (
+--- Forum: RockPro64 Hardware and Accessories (
+--- Thread: GNSS noise (/showthread.php?tid=14257)

GNSS noise - marcink - 06-23-2021

I'm having problem to run GNSS receiver with RockPro64.
I'm using Quectel EC-25EU with 0.8dBI antenna. The card is connected via USB2.0 cable and LTE hat.
When I use short (10cm) USB cable the time to first fix (TTFF) is very high (around 2 minutes). I tested different cables with different placement of modem relative to rockpro64. I also tested modem with notebook when rockpro64 is running next to. There is strong correlation between TTFF and distance to rockpro64.
I do not know what is source of noise however I see on PCB that there are mounts for metal shielding. I tried to find shop where it can be bought but without success. Please let me know if there is something that can be used to shield.
I would be grateful for any tips to decrease noise level. I'm already using ferrite beads on usb cable. It is hard to tell if there is any difference in TTFF as is is not stable.