The other thing to consider about EMI is the quality of the USB cable. ?There are a lot of ¡°junk¡± cables sold. ?I suspect the shielding is rather poor in a $1 cable. ?I know for sure from testing, that some USB cables can not even source 1 amp to charge a tablet. Testing various USB cables for RFI/EMI would make a good project for a student or experimenter ...
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73, Bernie. ? VE3FWF
