On Sat, Jul 13, 2024 at 02:10 PM, Kb4yho wrote:
Reached a point of diminishing returns on this internal noise issue.
Here’s what is effective:
5v DC-DC converter (Drok) upgraded.
Single board LPF on converter output.
Proper grounding on converter.
RF shielding on 22 pin DPI ribbon
RFI cover over display module
HAT RFI plate on Pi4
These enhancements have attenuated the internally generated RFI.
Especially shielding the DPI cable.
I have a question, as I also found a solution to this topic elsewhere.
Did you shield the monitor's 22-pin flexible cable and ground it at one or both ends? or did you leave it ungrounded?
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Gyula HA3HZ
HA3HZ