Bruce,

It would appear that Ferrite Cores filter out different frequencies based on the size, shape and material of the core.

Is the RFI that causes problems with the MRF250 at the same frequency that the MX3000/MRF250 uses (other URC products)? Or is the MRF250 susceptible to frequencies in addition to the frequency of the MX3000 which is causing the interference problems?

If certain cores are capable of filtering specific frequencies, it would seem logical to select a core specific to the frequency causing the problem. Or if all RFI is to be eliminated selecting a core that does that (if one exists).

Im not an engineer and Im trying to make an informed decision about which cores to buy. Not that its a monetary concern at $1 a piece but if Im going to spend the time to do it, I want to do it correctly. Any information would be appreciated.

John