Both Terry filter and RFI filter?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: pepperman-at-softhome-dot-net 

When using a Terry filter to protect my transformers, do I also need
a separate RFI filter to keep the interference out of the mains?  If
so, what frequency response is acceptable?  I recently looked at
some commercially available filters and found out that most of the
units they sold only went down to 150 kHz, although a couple of
the more expensive ones went all the way down to 10 kHz.

In case it matters, I was looking at filters made by Corcom (which
was recently bought by Tyco), specifically the B series 20-amp
model (cheapest series); the series that filters all the way down to
10 kHz is the T series, but it costs quite a bit more (~$88 vs. ~$23).

I'm building a largish coil (still undecided on some of the specs, but
it'll be an 8"-12" coil, hopefully around 1.5 kVA), so the resonance
frequency might be below the ratings of the RFI filters, but I'm not
sure if that matters or not.  Where does most of the RFI noise that
we're trying to filter out come from, anyway, and in what frequency
range?

So, do I need a separate RFI filter, and if so, will bottom of the line
model work fine, or would it not do much for keeping noise out of
the mains?

Michael Johnson