Hello,
Which your antenna module uses? and how it was fixed? (post a picture)
I'm asking because, positioning may not be the right way to pick up the signal.;-)
One ques .... For CAM-M8Q Module its mentioned that, Pin ANT and Pin RF_IN needs to be connected using a Short Trace. But is this Short trace needs to be 50Ohm controlled? In my design I connected this two pins directly and did not consider 50Ohm Trace.
I have just begun to use this module and am having a similar issue.
Previously i have used the UC530 (which the CAM-M8Q replaces) with no need to configure any settings.
Also i had just joined the ANT and RF_IN pins directly together.
Hi, I am having the same issue on my board with the u-blox CAM-M8Q, always invalid data are coming from the gps module, have you found a way to solve the problem?
I've got the same schematic as sakibnaz, I'm receiving frames via serial port, even I can communicate with M8Q with u-center (ublox software), but all the time GPS module doesn't get any useful data from satellites.
I resolved the problem. On my PCB, I had GND polygon on the bottom layer directly under the antenna (the top layer had ground plane clearance). The GND under the antenna blocked signal and caused interference. Probably PCB designer forgot about ground plane clearance on that layer. The solution was to mill PCB - 5x8mm polygon - remove copper under the antenna.
For more information read the manual at page 14-15 - 2.6 PCB layout suggestion - (CAM-M8Q_HardwareIntegrationManual.pdf)
PROBLEM:
Module communicates via serial port and sends proper NMEA frames, but can't get GPS fix.
SOLUTION:
Check top and bottom PCB layer, whether directly under the antenna you've got plane clearance (5x8mm) through all layers.
TIPS:
- Also remember if you are using embedded antenna to go outside (inside building you're probably won't get fix).
- Before PCB design read the manual (there are also some useful information about CAM-M8Q placement).
- CAM-MQ8 should get fix and send proper data over the serial port with default configuration - just as it arrives from factory.