On Fri, Mar 4, 2022 at 04:57 PM, Ken N2VIP wrote:
With the power supply attached to the GPIO pins, your RTL SDR dongle is probably always powered on, as confirmed by the RFI being generated if the RPi itself is on or off.
I think you are onto something as with the RPi off but powered through the GPIO, I get noise with the SDR dongle connected but not with the WIFI dongle connected. So obviously it might well be the dongle, I will try to connect it to a laptop to see if the same issue arises. It is at the end of a long USB cable, may the USB cable is acting as an antenna ?
My shack is at the top floor of a 4 storey building. I don't have a reliable RF earth up there, if I could earth the SDR dongle, may be it would be easier!!!
73,
Yannig - F4IUJ
