We are designing a GNSS receiver using the LimeSDR as the front-end and we faced a serious problem with the radiated interferences coming from the LimeSDR PCB.
The LimeSDR PCB is radiating a lot of electromagnetic noise specially between 1 GHz to 2 GHz. This interference prevents the placement of GNSS antennas nearby the LimeSDR PCB, and thus, they can not be integrated in a small device.
Please check the three videos I have recorded showing the problem:
https://youtu.be/2h7TVVrfxLs https://youtu.be/pIsLOmMKQ2Y https://youtu.be/JGieg1Mjds8
It is curious that the LimeSDR is not actually being used by the host computer, the interference appears just plugging the USB. I have tested it with two different LimeSDR boards just to discard a defective component, but I obtained the same result.
Any ideas of how to minimize the radiated interference? As far as I know there is no official or unofficial metal cage to solder in the LimeSDR board…
Any ideas which is the signal / component that is radiating such amount of RF noise??
Thank you and best regards,