I can't find the sheet of materials in the repository, could you please share it, so that I can know which electric component to use?

my email is: [email protected]

thanks very much!
ZHOU

Based on a theoretical analysis (I don't have a board available), I've found that the Qwiic GPS-RTK-SMA antenna bias voltage is below the voltage required by the ublox ANN-MB antenna. The antenna requires >= 3.0 V, but assuming data sheet values the antenna is only supplied with 2.65 V, due to voltage drop on the board. Details below.

ANN-MB supply voltage range and current:

• VCC = 3.0 ~ 5.0 V
• ICC = ~15 mA @ 5 V

ZED-F9P antenna supply voltage:

• VCC_RF = VCC - 0.1V = 3.2 V

Series resistance between VCC_RF and GND: R_BIAS = ~36 Ω

• Short circuit current limiting resistor R14: 33 Ω
• Bias inductor FB1 (LQW15ANR12J00D): 2.66 Ω
• 5m RG174: ~0.7 Ohm @ 0,15 Ω/m

This leaves VCC_RF - R_BIAS * ICC = 3.2 V - 36 Ω * 15 mA = 3.2 V - 0.55 V = 2.65 V for the active antenna.

Curiously, the F9P integration manual also does not meet the ANN-MB's voltage requirements, while disregarding its datasheet's absolute maximum value for the bias current with a total series resistance of ~20 Ω.

I have SparkFun GPS-RTK-SMA Breakout - ZED-F9P (Qwiic), I am connecting it to a ubuntu 18 machine. It runs as expected without problems until I connect another USB device, and the Horizontal and Vertical accuracies (hAcc, VAcc) become worst, and as soon as I uplug the other device from the USB, the hAcc and Vacc get back to previous ranges. The device I plug in is a realsense camera, but I also tried other USB devices and the same thing happens.
I am tryingt to run a SLAM using the GPS and the realsense camera so this issue is very important to me.
The same thing happens over windows 10 (runnig u-center), but the hAcc and Vacc get worst only for a short period of time and it gets back to normal.
I tried in a raspberry pi, Jetson Tx2 and the same happens. I also tried an USB isolator, but same issue.

Any advice of what I should do?

Thanks