Re: RFI filters, grounding and Power cabinets

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

Original poster: "Steve White by way of Terry Fritz <twftesla-at-qwest-dot-net>" <slwhite-at-zeus.ia-dot-net>

This backwards wiring appears to be one of those tesla coil myths that
continue to be propogated. I asked CORCOM about this business of wiring up
the filter backwards. They said don't do it. The filter will work as
intended wired normally. A second point that I have noticed is that most of
the power line filters that I have seen will not be very useful for a tesla
coil. That is because most of the large power line filters that I have seen
don't even start having serious attenuation until about 150 KHZ. Most coils
operate well below this frequency. Mine operates at 77 KHZ. What you want is
a filter designed to attenuate switching power supply noise. These have
significant attenuation at tesla coil frequencies. A typical example would
be the CORCOM model 15ET1. You can parallel several of them to get the power
handling capacity that you need.

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, October 22, 2001 10:35 AM
Subject: RFI filters, grounding and Power cabinets


> Original poster: "Jonathan Peakall by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <jpeakall-at-mcn-dot-org>
>
> Howdy All,
>
> First I gotta say I'd be lost at sea without this list..... Thanks to all
for
> all the help.
>
> I am building my power cabinet. The variacs and switches and so on are in
the
> case, and the NST is going to be under the coil, not in the cabinet. I am
going
> to have a filter on both the NST and the SG vac motor, and these I plan to
wire
> up backwards, connected to the RF ground. I also plan to have a final
filter
> where the power enters the PSU. Shold this filter be wired backwards, and
> should I run an RF ground to the PSU and connect the filter to that? Or
should
> I connect it to the mains ground? Should I hook it up correctly to the
mains
> ground?
>
> As always, Thanks!
>
> Jonathan Peakall
>
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