Re: RFI filters, grounding and Power cabinets

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jimlux-at-earthlink-dot-net>

Good points on the frequency range (although, most disruptive TC's DO have a
significant amount of conducted (as opposed to radiated) RF noise above 150
kHz.. In fact, I'd venture to say that MOST of the EMI/EMC problems you'll
run into with a coil are conducted, not radiated.
Also, consider that there will be some harmonic content... and RF at other
resonances in the system (for instance, HF and VHF from the actual spark gap
geometry)

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, October 22, 2001 7:39 PM
Subject: Re: RFI filters, grounding and Power cabinets


> 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 al
l
> 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
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
>
>