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.
can you borrow a different dongle and try it - preferably from a different source/manufacturer?
Can you try powering the RPi from a conventional power supply connected to the USB-C connector?
Powering the RPi thru the GPIO pins *should* be fine, but who knows?
Ken, N2VIP
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On Mar 4, 2022, at 05:54, Yannig - F4IUJ via groups.io <yannig.robert@...> wrote:
?Hello all,
My raspberry Pi is creating so much RFI that I need to switch it off to traffic... That bugs me and I am 90% sure that the culprit is the USB bus. As you all seem to be getting on well with your Pis, I must be doing something wrong...
My setup at the moment :
- A small 5V switch mode supply that I bought to replace the noisy and underpowered supply I had before. I initially thought that it was the culprit but no it is not as if I run it alone I am fine...
- The supply is directly connected to the appropriate pins of the GPIO of the Raspberry. That is still fine
- Now starts the weirdness...
- If I plug my RTL-SDR or my WIFI dongle into the raspberry USB port, I become deaf as horrendous RFI appears in the shack, it is like trying to have a conversation in a noisy night club, hopeless!!!
- It doesn't matter if the raspberry is switched on or off, it still happens
- If I use the USB 2.0 port instead of the 3.0 may be it is a little bit better but it still is terrible
I am stuck, any suggestion to make some progress is welcome...
73
Yannig - F4IUJ
