As some of you mite remember some time last year I bought a 10mA RCD socket to protect my test/workbench sockets when it arrived I fitted a beefy length of flex to it with a plug on and set it up in position great so far. One of the items plugged in is a frequency counter which I always have on when I'm using my ham radio transmitter it all worked well when I was on 14 Megs and on 7 Megs however when I was on 3.7 Megs the RCD would trip. Disaster! After a bit of head scratching and un lady like language I fitted a mains filter between the RCD socket and the bench socket boards this fixed the problem but weirdly now if I don't have the counter on (I forgot it by chance one day) it now trips whatever band I'm on but all is ok with the counter on. The reason I'm sharing this is because if any of you get trouble with electronic trips then a mains filter mite help not easy to add in a DB I know but thought ide share anyway
If you are rolling your own mains filters as it were, then as in the UK we do generally know which is live and which is neutral, we do not have to have the delta of capacitors beloved of the international equipment. The N_E capacitor and the L_N capacitor can be made quite a bit bigger than the L_E one that causes all the RCD issues, and from an RF point of view L,N and E are well connected to each other. (And as per that video, all 3 cores need to be wound onto a choke as if they were one - there is little point in raising the impedance of L and N, if there is in effect an RF bypass via a low impedance CPC.)
Actually generally in my experience, unless there is a large out-of balance current that would cause magnetic saturation, you can gain more RF isolation from a ferrite ring core than a rod.
If you are rolling your own mains filters as it were, then as in the UK we do generally know which is live and which is neutral, we do not have to have the delta of capacitors beloved of the international equipment. The N_E capacitor and the L_N capacitor can be made quite a bit bigger than the L_E one that causes all the RCD issues, and from an RF point of view L,N and E are well connected to each other. (And as per that video, all 3 cores need to be wound onto a choke as if they were one - there is little point in raising the impedance of L and N, if there is in effect an RF bypass via a low impedance CPC.)
Actually generally in my experience, unless there is a large out-of balance current that would cause magnetic saturation, you can gain more RF isolation from a ferrite ring core than a rod.
