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RE: [TCML] Terry Filter Resistors
Hello Phil,
Do you have a working link to your filter schematic or can you email it to
me? I am about to start work on my HV cabinet and am finishing my 19"
rack control cabinet which is also pretty crammed. I plan on grounding one
side of the pig, TC primary, and secondary base of course to RF ground
though. I was planning on using the air-core inductor preceeded by about 50
ohms of high power resistors Dr. Resonance uses on the way out of the HV
cabinet. I am going to make a horn gap and mount it on the hv out on the
transformer.
Jim Mora
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of FIFTYGUY@xxxxxxx
Sent: Friday, January 30, 2009 9:53 PM
To: tesla@xxxxxxxxxx
Subject: Re: [TCML] Terry Filter Resistors
In a message dated 1/30/09 10:37:14 P.M. Eastern Standard Time,
bartb@xxxxxxxxxxxxxxxx writes:
>I don't think any tests are needed as the manufacturer has listed the L
>for us. I wouldn't even waist my time with it now unless you feel you
>want to verify.
It amazes me how nobody here seems to check the archives first:
_http://www.pupman.com/listarchives/2008/Aug/msg00413.html_
(http://www.pupman.com/listarchives/2008/Aug/msg00413.html)
I run four identical resistors total in my Terry Filter for my pig. Two
in series on each leg, one mounted at the pig, one down under the coils. My
theory is that a secondary strike to the primary feed lines will at least
be
partially mitigated by the resistors in each direction - wishful thinking!
Resistors are Memcor 125W 68 Ohms each, part number RW12V680. These are the
old
"ferrule" style, popular with the military (and high frequency/high voltage
equipment!), and mount like cartridge fuses in clips.
Funny how somebody finally went to Ohmite for tech info, but if you
look
in the bottom right corner of the Ohmite home page, there's a link to
"legacy literature" for the old Memcor-TruOhm catalog:
_http://www.ohmite.com/catalog/pdf/memcor-truohm.pdf_
(http://www.ohmite.com/catalog/pdf/memcor-truohm.pdf)
I think this old catalog is much more interesting reading than the
Application Notes in the main Ohmite catalog! There's even info in there
about the
inductance of the resistors, but it seems their attitude is "if you're not
looking at non-inductive resistors, it doesn't matter". Also interesting
that
it seems their non-inductive resistors are at least dual-layered.
Anyhow, I figure the source impedance of a NST is ten times higher than
a Pig's, the operating frequency of a NST coil is roughly five times my Pig
coil's, the Terry Filter resistance for an NST is about ten times what I'm
using for my Pig, and I'm using much bigger Terry caps with my Pig. So if
the
inductance of the NST resistors is 100 times that my Pig resistors, no big
deal!
Thanks again, Terry, for designing the filter in the first place. Cheap
insurance, and as the archives show, using your filter has definitely
solved
some incredibly bad transient problems that I had. We'll probably never
know
how much equipment (or even lives!) your filter has saved.
-Phil LaBudde
Center for the Advanced Study of Ballistic Improbabilities
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